SERVICE
MANUAL

HAMMOND ORGAN COMPANY

DIVISION OF HAMMOND CORPORATION

11700 Copenhagen Court / Franklin Park, Illinois 60131

TABLE OF CONTENTS

Page

Introduction iv

Specifications iv

SECTION I - How the Organ Operates

1-1 General 1-1

1-2 Tone Source 1-1

1-3 Motor and Power Switch 1-4

1—4 Tone Generator 1—4

1—5 Manuals 1—5

1—6 Harmonic Drawbars 1-7

1-7 Pedal Drawbar 1-7

1-8 Pedal Keyboard 1-7

1—9 Expression Pedal 1—7

1-10 Control Tabs 1-8

1-11 Preset Tabs 1-8

1-12 Vibrato Tabs 1-8

1-13 Reverberation Volume Soft Tabs 1-8

1-14 Percussion Control Tabs 1-8

1-15 L-100A Preset Percussion Unit 1-9

1-16 Selector Switch 1-9

1-17 Harmonic Busbar Switching and Reiteration Split ... 1-9

1-18 L-100-1 Six-Voice Percussion Feature 1-9

1-19 Location of Controls 1-9

1-20 Voicing 1-9

1-21 Operation of Controls 1-9

1— 22 External Equipment 1 — 11

1-23 Extension Speakers 1-11

1-24 External Sound Source 1-11

1- 25 Earphones 1-11

SECTION II - Theory of Operation

2- 1 General 2-1

2-2 Preamplifier 2-1

2-3 Vibrato Phase Shift Amplifier 2-1

2—4 Percussion Amplifier 2—2

2—5 Reverberation and Power Amplifier 2—2

2-6 Power Supply 2-3

2-7 L-100A Percusion Voicing Circuitry 2-3

2- 8 Mode Switch 2-3

2-9 Frequency Divider 2-4

2-10 Cymbal and Brush 2-4

2- 1 1 Brush Keying 2-4

2-12 Cymbal Keying 2-4

2-13 Brush and Cymbal Amplification 2-4

2-14 Power Supply 2-4

2-15 L- 1 00-1 Six-Voice Percussion Circuitry 2-4

2-16 Power Supply 2-4

2-17 Push-Button Circuits 2-5

2-18 Lower Manual Keying Circuits 2-5

2-19 Pedal Keying Circuit 2-5

SECTION III - Disassembly

3-1 General 3-1

3—2 Access 3—1

3—3 Upper Manual Key 3—1

3—4 Lower Manual Key 3—1

3—5 Drawbar Contact Spring 3—1

3-6 Drawbar, Drawbar Knob, Drawbar Assembly 3-1

3-7 Upper Manual 3-2

3-8 Lower Manual 3-2

3-9 Generator 3-2

3-10 Motor 3-2

3-11 Pedal Keyboard 3-2

3-12 Swell Assembly 3-3

3-13 Tab 3-3

3-14 Pilot Light on Power Switch 3-3

3-15 L-100A Percussion Circuitry 3-3

3-16 L- 100-1 Six-Voice Percussion 3-3

SECTION IV - Practical Service Suggestions

4-1 General 4-1

4-2 Organ Performance Check 4-1

4-3 Equipment Required 4-1

4—4 Procedure 4-1

4-5 Vibrato 4-2

4-6 L- 1 00A Percussion Performance Check 4-3

4—7 L— 100— 1 Six-Voice Percussion Performance Check

and Troubleshooting 4-4

4-8 Output Level Adjustments 4-4

4-9 One Voice is Silent 4-4

4-10 Programmed Voice Does Not Speak 4-4

4-11 All Percussion Voices Silent 4-4

4-12 Both Hiss Voices Silent 4-4

4-13 No Voice Response from Pedals 4-4

4-14 No Voice Response from Manual 4-4

4-15 No Percussion Output 4-4

4- 16 Troubleshooting 4-4

4-17 Organ Does Not Play 4-5

4-18 Key Does Not Play or Harmonic Missing 4-5

4-19 One Note is Weak 4-6

4-20 Percussion Notes Weak or Missing (L- 1 00) 4-6

4-21 Full Volume Pedal Cipher 4-6

4-22 Hum 4-6

4—23 Replacing Tubes 4—6

SECTION V - Diagrams

5— 1 General 5—1

SECTION VI - Parts List

Index - L- 100 Series 6-1

Index - L-200 Series 6-15

LIST OF ILLUSTRATIONS

Figure Page

1-1. L- 100 Console, Front View 1-1

1-2. L- 100 Console, Rear View 1-2

1-3. Block Diagram, L- 100 Series 1-3

1—4. Typical Tone Generator 1—4

1-5. Magnet Locations on Tone Generator 1-4

1-6. Filter Locations and Frequency Terminations on

Generator Cover 1-5

1-7. Manual Wiring Chart 1-6

1-8. Drawbars & Control Tabs (Partial View) 1-7

1-9. Pedal Keyboard 1-8

1-10. L-100A Preset Percussion Unit 1-10

1-11. L- 1 00- 1 Six-Voice Percussion Controls 1-10

1 — 12. Earphone Adapter Circuit 1—11

4- 1. Vibrato Adjustment Waveform 4-2

5- 1. Schematic Diagram, L-100 Organ with AO-41 Amplifier 5-2

5-2. Schematic Diagram, L-100 Organ with AO-47 Amplifier .... 5-3

5-3. Schematic Diagram, L-100 Organ with AO-47 Amplifier

and LDR Expression Control 5-4

5-4. Schematic Diagram, L- 1 00A, L- 1 00- 1 & L- 1 00-2

Organ Consoles 5-5

5-5. Schematic Diagram and Parts Layout, L-100A Percussion Unit 5-6

5-6. Schematic Diagram and Parts Layout, L-100- 1 Six-Voice

Percussion 5-7

5-6A. Schematic Diagram and Parts Layout, L- 100-1 Six-Voice

Percussion, Early 1970 Production 5—8

5—7. Schematic Diagram, L— 100— 1 Percussion Power Supply .... 5—9

5-8. Schematic Diagram & Parts Layout, Pedal Control Board 5-10

5-9 Wiring Diagram, L-100 Organ 5-11

5-10. Wiring Diagram, L- 1 00- 1 and L- 1 00-2 Organs 5-12

5-11. Wiring Diagram, Control Panel, L- 1 00 Series 5-13

5-12. Wiring Diagram, Control Panel, L-100 Series Revised 5-14

5—13. Wiring Diagram, Percussion Unit, L— 1 00A 5—15

5-14. Wiring Diagram, Six-Voice Percussion, L- 1 00- 1 5-16

5-15. Parts Layout AO-41 Vibrato Amplifier 5-17

5-16. Parts Layout AO-47 (126-000023) Vibrato Amplifier 5-18

5-17. Parts Layout, AO-42 ( 117-000019) Percussion Amplifier .. 5-19

5-18. Parts Layout, AO-43 (126-000017) Power Amplifier 5-20

5-19. Power Amplifier Fuse Location (Canadian, 101-000130) .... 5-21

5-20. Wiring Diagram, L-200 ■ 5-22

INTRODUCTION

This manual contains service information for L— 100 Series organs. The series is comprised of the following
models:

L-100
L-100A
L-10O-1
L- 100-2
L-200

The Model L— 100 Hammond organ is a completely self-contained console, requiring no external tone
cabinet. It has two manuals or keyboards of 44 keys each, a 1 3 note pedal keyboard, and an expression
(swell) pedal for controlling the volume. All tones are produced by electro-magnetic tone generators and
electrically amplified. Selection of tone colors is made by adjusting 17 drawbars and 6 preset tabs. Other
characteristics of the music are adjusted by means of 1 0 other tabs. A toggle switch, located to the right
of the console above the manuals, is used to turn on the organ. A pilot light shows when the organ is
turned on.

Model L-100 A is similar to Model L-100, with the addition of percussion voicing circuitry, controlled
from the lower left end block.

Model L— 100— 1 is similar to L— 100, with a six-voice percussion feature added. Percussion controls are
mounted in the lower right end block.

Model L- 100-2 is identical to Model L-100-1, with the addition of the "drawer" type automatic
Rhythm II feature. No service information for Rhythm II is contained in this manual, since its circuitry
is independent of the organ. For Rhythm II service information, refer to the Service Manual for Rhythm II
HO -46 6.

Model L-200 with inbuilt rhythm is electrically identical to the L- 100-2 organ. Wiring of the rhythm uni
to the console is presented in Figure 5-20.

L-Series organs will have fuses added to the Canadian power supply (101-000130) to comply with C.S.A.
standards. Location and value of fuses are shown in Figure 5 — 19.

For convenience in location desired information, this manual is divided into the following sections:

For convenience in locating desired information, this manual is divided into the following sections:

I. How the Organ Operates
II. Theory of Operation

III. Disassembly

IV. Practical Service Suggestions
V. Diagrams

VI. Parts List

SPECIFICATIONS

DIMENSIONS: Width, 43W; Height, 44 1 /2"; Depth, 23"
WEIGHT: 215 lbs.
POWER INPUT: 140 Watts
OUTPUT: 15 Watts, E.I.A.

SECTION I
HOW THE ORGAN OPERATES

GENERAL - This section contains a
description of the operating principles of
L-100 Series organs. Figures 1-1 and
1 -2 depict the locations of the various
subassemblies. Figure 1 -3 is a block
diagram.

TONE SOURCE - Most tone sources, such
as strings, reeds, or pipes, produce complex
tones. The Hammond tone-producing
mechanism, however, generates individual
frequencies which can be combined by
means of harmonic drawbars to produce any
desired tone quality. The block diagram,

Figure 1-3, shows the chief components
of the instrument.

Electrical impulses of various frequencies
are produced in the "tone generator
assembly" which contains a number of
"tone wheels" driven at predetermined
speeds by a motor and gear arrangement.
Each tone wheel is a steel disc similar to a
gear, with high and low spots, or teeth, on
its edge (see Figure 1 -4). As the wheel
rotates, these teeth pass near a permanent
magnet, and the resulting variations in the
magnetic field induce a voltage in a coil

pedal'keyboard

Figure 1-1. L-100 Console, Front View

Figure 1-2. L-100 Console, Rear View

wound on the magnet. This small voltage,
when suitably filtered, produces one note of
the musical scale, its pitch or frequency
depending on the number of teeth passing
the magnet each second.

A note played on either manual of the
organ consists of a fundamental pitch and
a number of harmonics, or multiples of the
fundamental frequency. The fundamental
and harmonics available on each playing
key are controllable by means of drawbars.
By suitable adjustment of these controls
the player may vary the tone colors at
will. Several pre-selected tones are also
available by use of the preset tabs.

Mixed tones from the upper manual and
lower manual and pedals go through the
pre-amplifier and the "vibrato amplifier".
Vibrato may be added, depending on the
position of the vibrato selector tabs. The
tones then pass through the expression
control and additional stages of amplifica-
tion before reaching the speaker.

Percussion tones are produced by borrow-
ing a signal from the upper manual 2nd
harmonic drawbar, 3rd harmonic drawbar,
or both, and conducting the signal through
the percussion amplifier, where its decay
characteristics are controlled.

A portion of this signal is returned to the
respective drawbar. The percussion signal
is then combined with the signal from the
manuals after the vibrato system but before
the expression control. The control tubes
are keyed through the 6th harmonic key
contacts and busbar.

The pedal tones do not require drawbars
for tone color variation, because they are
produced as complex tones by special
tone wheels. The single pedal drawbar
adjusts the volume of the pedals relative
to that of the manuals, and the pedal signal
then is combined with the signal from the
manuals before passing into the matching
transformer.

Figure 1 -4. Typical Tone Generator

MOTOR AND POWER SWITCH. - The tone
generator assembly, in which all tones of
the organ originate, is driven at constant
speed by a self starting synchronous motor,
operating at 1800 RPM, located at the left
side (rear view) of the console (Figure
1-2). (In 50 cycle organs, the generator
speed is 1500 RPM).

A toggle switch (Figure 1 -1 ) controls
power to the organ.

TONE GENERATOR. - All tones of the organ
originate as electrical signals in the tone
generator assembly. It contains 87 tone
wheels having various numbers of teeth,
with suitable gears for driving them at
various speeds from a main shaft extending
along the center. Each pair of tone wheels
is mounted on a shaft and between them is
a bakelite gear held by a coil spring, forming
a mechanical vibration filter. As the gear is
not rigidly attached to the shaft, any pair
of wheels which may be stopped acciden-
tally will not interfere with the operation
of the others.

Adjacent to each tone wheel is a magnetized

rod with a pickup coil wound on it. These
magnets extend through the front and back
of the generator, and are held by set screws
which can be loosened in case adjustment
is ever necessary. Figure 1-5 shows the
location of the magnet for any frequency
number. In the illustration the dotted lines
indicate frequencies whose tone wheels are
on the same shaft.

On top of the tone generator assembly are
small transformers and condensers, forming
tuned filters for the higher frequencies.
They are not likely to need replacing. In
case one filter becomes inoperative, both
the transformer and condenser must be
replaced with a matched set from the
factory. Figure 1-6 shows the location of v
these filters. A few frequencies use untuned
filters consisting of coils alone.

Wiring from the various filter assemblies
leads to the terminal strip on the long edge
of the generator.

The output frequencies of the tone genera-
tor are numbered, for convenience, in order
of increasing frequency. The lowest, number

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Figure 1-5. Magnet Locations on Tone Generator

1, is about 32 cycles per second, and the
highest, number 91, is about 6000 cycles
per second. Frequency numbers 1 to 13 are
used only for the pedals; numbers 14 to 17
are omitted; and numbers 18 to 91 are used
for the manuals. Figure 1 -6 showing filter
locations also shows the termination point
of each frequency, while Figure 5-1 shows
typical tuned and untuned tone generators.

In case any generator frequency is weak or
absent, refer to "Practical Service Sugges-
tions" for the procedure to be used in
locating and correcting the trouble.

MANUALS. - Musical frequencies from the
tone generator go through the manual cable
to terminal strips on the two manuals and
from them to the key contact springs.

Each of the two manuals has 44 playing
keys, or approximately VA octaves. The two
manuals do not cover exactly the same
pitch range, but they are arranged so that
keys of like pitch are in line. Middle "C" is
the first C on the upper manual and the key
in line with it on the lower manual.

number of contact
mental and harmonics
of that key) which contact an equal number
of busbars when the key is pressed. All
contact springs and busbars have precious
metal contact surfaces to avoid corrosion,
and the manuals are sealed to exclude dust
so far as possible. In case a contact becomes

dirty in spite of these precautions, a busbar
shifter is provided in each manual to slide
the busbars endwise and thus provide a
fresh contact surface. (See paragraph 4-3b).

Looking under the lower manual on the
left hand end (front view) a black wood
end block will be observed. One half inch
from the front of this block is a drilled hole.
Within this drilling is a small metal tongue
with a punched hole. Using either long nose
pliers or a hook, this tongue can be moved
in and out and it in turn moves the busbars.
The upper manual shifter is in a similar
place and access to it is from the rear of the
console.

The key c

cts are connected through
;s to the manual terminal
strips. The manual wiring chart, Figure 1-7,
shows how the contacts of each key are
connected to the proper frequencies to
supply the fundamental and harmonics of
that particular key. The blank spaces
indicate that no key contact is used, inas-
much as the higher harmonics of these
keys are not required. Since the percussion
control circuit is keyed through the 6th
harmonic busbar, the blank spaces in this
row have contacts connected to ground
through resistance wires.

The busbars of each manual, each one
carrying a certain harmonic, are wired to
the appropriate harmonic drawbars for
that manual through the "Drawbars" tab.

Figure 1 -6. Filter Locations and Frequency Terminations on Generator Cover

HARMONIC DRAWBARS. -The left group
of seven harmonic drawbars (Figure 1 —8)
is associated with the lower manual, and
the right group of nine drawbars controls
the upper manual. By sliding these drawbars
in and out, the organist is able to mix the
fundamental and harmonics (or overtones)
in various proportions. The distance a bar
is pulled out determines the strength of the
corresponding harmonic; and if a drawbar
is set all the way in, the harmonic it repre-
sents is not present in the mixture. Neither
manual will play unless one of its drawbars
is pulled out at least part of the way with
the drawbar tab pressed, or a preset tab is

The drawbars slide over 1 7 busbars, repre-
senting intensity levels. As the drawbar
moves, its contact is touching some busbar
at all times, and therefore there is a smooth
change in volume of that harmonic.

These busbars extend the length of the draw-
bar assembly, and are connected to the
low impedance primary of a matching
transformer. Signals from the high imped-
ance secondary of this transformer go to
the preamplifier input. The matching

-7. PEDALDRAWBAR. - The center drawbar
adjusts the volume of the pedals. Its opera-
tion is similar to that of a manual d

1-8. PEDAL KEYBOARD. - The 13 playing pedals
are operated by the left foot and are con-
nected to the lowest 13 frequencies of the
generator. Like the manuals, they have
light and dark keys arranged in the standard
octave pattern. Figure 1 —9 identifies the
pedals and shows the generator frequency
number associated with each. A single
contact on each pedal closes when the pedal
is pressed, thereby allowing the correct
generator frequency to reach the amplifier.

1-9. EXPRESSION PEDAL. - The expression
pedal, sometimes called "swell" pedal
(Figure 1-1) is operated by the player's
right foot and varies the volume of both
manuals and pedals together. When the
pedal is tilted back (closed) by pushing on
the player's heel the music is softest, and
when pushed forward (opened) by the
player's toe the music is loudest.

Figure 1-8. Drawbars & Control

1-7

Figure 1 —9. Pedal Keyboard

10. CONTROL TABS. - There are 17 tabs on the
L-100 series instrument, each providing
some change in the instrument's operation.

To have the instrument sound after turn-
ing it on, tabs such as FULL ORGAN and
ENSEMBLE will place the upper and lower
manual in operation. A tab is in use when
in the down position. Functions of the
various tabs from left to right as they
appear on the instrument are given in the
following paragraphs.

11. PRESET TABS. - Four tabs are provided
for the upper manual and two for the
lower manual. As indicated, they provide a
choice of using the drawbars or playing the
preset tones indicated on them.

12. VIBRATO TABS. - The L-l 00 series organs
are equipped with 3 tabs which vary the
vibrato effect. Three degrees of vibrato

are available using the VIBRATO NORMAL,
VIBRATO SMALL or both together.
VIBRATO CHORUS can be used with
VIBRATO NORMAL, VIBRATO SMALL,
or both, to provide different degrees of
chorus.

1-13. REVERBERATION AND VOLUME SOFT
TABS. - Several degrees of reverberation
are obtained by the use of either or both
tabs labeled REVERB I and REVERB II.
These tabs, in addition to turning this feature
on, govern the loudness or amount of rever-
beration by a resistive network used in con-
juntion with the speaker. The VOLUME
SOFT tab controls the overall volume of the
organ and is especially useful where playing

I — 14. PERCUSSION CONTROL TABS - There are
four of these tabs which operate only when
the upper manual DRAWBARS tab is de-
pressed. Pressing either the SECOND
HARMONIC or THIRD HARMONIC tab
will, when the upper manual is played,
cause the tone to sound percussively (in
addition to sustained organ tones). Both
tabs can be depressed, giving a combination
percussive tone. The FAST DECAY tab
causes the percussive tones to fade away
with greater rapidity. PERCUSSION SOFT
reduces the volume for the percussive signal.
Operation of the electrical circuits associated
with this feature is described in subsequent
paragraphs.

1-15. L-100A PRESET PERCUSSION UNIT (See
Figure 1-10).- When added to the L-100
series instrument, this unit adds five pre-
voice percussion effects, including reiter-
ation in three speeds. It also provides three
percussion effects, "Normal (Non- Vibrato)",
"Vibrato", and "Delayed Vibrato". For the
rhythm accompaniment it also provides a
"Cymbal-Brush" effect, the "Brush" being
on the lower manual, and available when
played in a legato fashion each time a key is
depressed. The "Cymbal" is available on the
pedal and sounds each time a pedal is de-
pressed. The "Cymbal-Brush" control turns
these effects on and selects the "Cymbal-
Brush" volume.

1-16. SELECTOR SWITCH. - With the Selector
Switch in the "Drawbar" position, the
signals from the upper manual harmonic
busbars are routed to their associated
drawbars in the upper manual group. The
following is a breakdown of the harmonic
switching used.

1-17. HARMONIC BUSBAR SWITCHING AND
REITERATION SPLIT. - Upper Manual.
The Sub-Fundamental, sub-third and eighth
harmonics are not switched. The sixth har-
monic busbar is used for percussion keying.

With the Selector Switch in the "Drawbar"
position, all harmonic busbars are routed to
their associated drawbars.

1-18. L-100-1 SIX-VOICE PERCUSSION FEATURE
(See Figure 1-11). -

1-19. LOCATION OF CONTROLS. - The rhythm
controls are located on the right end block
of the lower manual.

1-20. VOICING. - The following voices are
available.

BLOCK

CYMBAL

BRUSH

BONGO

TOM-TOM

CLAVES

1-21. OPERATION OF CONTROLS. - Any of the

six voices may be played at any time by
means of the momentary push buttons
associated with the rocker tabs.

The BLOCK and CYMBAL voices are pro-
grammed into the pedal keyboard when
their rocker tabs are "on". The remaining
four voices are programmed into the lower
manual keys when their rocker tabs are

REITERATION SPLIT
"A" CHANNEL "B" CHANNEL

(5 th to Freq. Div.)
(1-1/4 From Freq. Div.)

1-9

Figure 1-10. L-100A Preset Percussion Unit

Figure 1-11. L- 100-1 Six- Voice Percussion Controls

1-10

The RHYTHM VOLUME control, mounted
to the right of the rocker tabs, regulates
the loudness of the rhythm voices relative
to the other organ voices. The organ's
expression pedal also affects the rhythm
voices except brush and cymbal.

The BRUSH and CYMBAL voices sound
without reverberation. The remaining voices
are reverberated whenever a REVERB tab
on the organ's control panel is depressed.

EXTERNAL EQUIPMENT. - The L 100

Series organs may be equipped with ex-
tension speakers, external inputs and
earphones.

EXTENSION SPEAKERS. - A Hammond
Model PR-40 Tone Cabinet may be used
as an extension speaker. A Tone Cabinet
Control Kit, P/N AO-22625-2 is required
for proper interconnections. Installation
instructions are furnished with the kit.

EXTERNAL SOUND SOURCE. -A record
player or microphone equipped with a
suitable preamplifier, or a radio, can be
played through the organ's speakers. The
device used should have an output level of
about 1/2 volt rms maximum, and should
have its own volume control, since the
organ volume controls will not affect the
signal. The organ may be played at the
same time.

To connect an external sound source, a
Switchcraft Type 330 Fl "Y" connector is
required. Remove the connector cable from
the WH terminal on the power amplifier.
Insert the "Y" connector into the terminal,
and insert cable previously removed into
one arm of the "Y". Connect external
sound source to the other arm.

EARPHONES. - In order to use earphones,
the output jack and network shown in
Figure 1-12 are required. When earphones
are in use, organ speakers are silenced.

Figure 1-12. Earphone Adapter Circuit

SECTION II
THEORY OF OPERATION

2-1. GENERAL. - This section contains circuit
descriptions of the amplifier chassis, and
the percussion attachments. There are
three amplifier assemblies in the L-100
series instruments. On the upper shelf as
viewed from the rear, to the left is the
vibrato amplifier, towards the center the
preamplifier and percussion amplifier,
while the reverberation and power amplifier
is located on the lower shelf.

2-2. PREAMPLIFIERS (See Figure 5-1). - The pre-
amplifier (VI) receives all signals impressed
on the matching transformer secondary,
which originate by use of the drawbars or
preset tabs. Should any percussion tab be
in use, a portion of the second, third or
both harmonics of the upper manual will
also appear in the input circuit of the per-
cussion amplifier which will be discussed
further on.

2-3. VIBRATO PHASE SHIFT AMPLIFIER (See
Figures 5-1 through 5-4). - The vibrator
system varies the frequency of the tones
by continuously shifting their phase.
Circuit components include three series-
connected vacuum tube phase shifter stages
(V2A,V2B, and V3A), associated saturable
reactors (SRI 01, SRI 02, SRI 03), voltage
amplifier (V3A), vibrato oscillator (V4A),
and driver stages (V4B, V5).

A single low frequency oscillator (V4)
provides the rate for the vibrato system
(approx. 6.8 CPS). With either the normal
or small vibrato tab in use, this oscillator
impresses its signal on V4, a cathode fol-
lower and isolation stage. Positive pulses
now appear on the grid of driver tube V5.
The plate circuit of this tube is in series
with three saturable reactors located in the
plate and cathode circuits of the phase shift
stages. Irrespective of which vibrato stop is
used, the rate remains constant, but the
degree of vibrato is determined by the
amplitude of the positive pulse on the
driver tube.

The continuous phase shift is accomplished
by using 180' out-of-phase signals from the

plate and cathode of each shifter stage and
controlling them with the saturable reactors.
Plate and cathode resistors are of equal
value and consequently signals are equal in
amplitude in each plate and cathode circuit.
The saturable reactors serve as a means of
providing a varying composite of signals
from both plate and cathode of each stage,
ranging from virtually full cathode signal to
full plate signal.

The driver tube plate current varies from
about .5ma to 5ma. at vibrato rate. This
current varies the degree of saturation in
the reactor cores and results in a smoothly
varying impedance.

At minimum driver current (when the
voltage feeding driver tube V5 is negative
and driver tube is nearly cut off) the
reactor impedances are maximum and are
large compared to the 15000 ohm plate,
circuit series resistors R104, Rl 10, Rl 15.

Therefore, under this condition most signal
will emanate from the plate. (The reactors
being virtually short circuited by the plate
circuit series resistors) and phase shift will
be maximum — approaching 180° — since
plate voltage is 180° out of phase with grid
voltage.

At maximum driver current (when voltage
feeding driver tube V5 is positive and driver
tube is conducting maximum current) the
reactors are saturated and their impedance
is a minimum —small compared to the 15000
ohm plate circuit series resistors R104,
Rl 10, Rl 1 5. Therefore, most signal will
emanate from the cathode (the saturated
and low impedance reactors virtually short
circuit the plate circuit series resistors) and
phase shift will be a minimum - approach-
ing 0° - since cathode voltage is in phase
with input grid voltage.

Between these extremes, the phase varies
smoothly under control of the saturable
reactors.

The continuous change in phase is equi-

valent to a continuous frequency vari-
ation, and thus the frequency varies up and
down at vibrato rate.

PERCUSSION AMPLIFIER (See Figures 5-1
through 5-4). - The 2nd or 3rd harmonic
signal, or both, when these tabs are de-
pressed, will be impressed upon the input
of the 2N306 transistor. The output of
this transistor is resistance coupled to the
one half of VI 1 which acts as a control
tube and is normally conducting, so when a
key is depressed the percussive note first
sounds loudly. It passes through the control
tube and a band pass filter and is impressed
on the grid terminal of V 1 .

Immediately the note begins to fade away,
giving the characteristic percussion effect.
This fading is accomplished as follows: When
either harmonic stop is depressed the key-
ing wire (normally held at plus 28 volts
through anti-spark resistor R21 5) is con-
nected to solo manual 6th harmonic draw-
bar. When a key is pressed this keying line
is grounded through the key contact and
tone generator filter. This virtually grounds
the grid and plate of VI 1 (connected as a
diode) open-circuiting the tube and isolating
the control tube grid circuit. The grid of
the control tube drifts from its operating
potential of about 25 volts to a cutoff potential
potential (about plus 1 5 volts) at a rate
determined by the time required for C210
to discharge through R219 and R409.

The percussion signal is now blocked. No
percussion notes can sound until all keys of 2-5.
the solo manual are released and the control
grid again rises to plus 25 volts. The time of
this rise (that is, how quickly the control
tubes turn on again after the key is released)
is the time required to charge C210 to plus
25 volts through R218.

When a "percussion" tab is pressed the solo
manual second, third, or both harmonic
manual busbars are connected to the green
percussion signal line and a 5 OHM series
resistor is connected between the manual
bus wire and drawbars providing for a sus-
tained signal in addition to the percussion
signal. The 6th harmonic drawbar is dis-
connected from its lead wire and this wire
(which is grounded through the generator
magnets when any key is pressed) is used
to turn off the control tube. Therefore the
6th harmonic is not available on the upper

manual when the percussion is in use.

When the PERCUSSION SOFT tab is down,
it reduces the volume by shunting resistor
R224 into the dividing network composed
of R222 and R223.

The PERCUSSION FAST DECAY tab
determines how fast the sound fades away
after a key is pressed. When the tab is up,
resistor R2 1 9 discharges capacitor C21 0, re-
ducing the D.C. voltage on the control tube
grids to cut-off in about 2-1/2 seconds.
When the tab is down, resistor R409 is
shunted across resistor R21 9, reducing the
time to discharge capacitor C2 1 0 and there-
by reducing the D.C. voltage on the control
tube grid to cut off in less than one-half
second.

With either or both 2ND and 3RD HAR-
MONIC tabs down, the harmonic drawbar
wires are connected to the green signal input
wire of the percussion amplifier. Either or
both signals are fed back to their respective
drawbars by resistors R4 1 0 and R4 1 1 which
are shorted out when the percussion tabs

The percussion signals as well as the signals
from the vibrato and phase shift amplifier
are combined in the input circuit of cathode
follower VI and are sent to the expression
control, which is also connected to the
input of the reverberation and power
amplifier.

REVERBERATION AND POWER AMPLIFIER
(See Figure 5-4). - The combined signals
from both prior mentioned amplifiers (after
the expression control has acted upon them)
are impressed on the grid of V6 and in turn
on V7, the reverberation drive tube. After
passing through the reverberation unit the
signal is again amplified by V6 and passed
through a resistive network, components of
which are variable, permitting the reverbera-
tion to be available in several intensities
and "off". From the input of V7 (the
reverberation drive tube) a signal is shunted
around the reverberation unit and its control
features which provide a path for the non-
reverberation signal. The input of V8 re-
ceives this signal as well as a reverberative
signal. This common input line also contains
the VOLUME SOFT tab circuitry.

The output of the second half of V8 is a

phase inverter driving push-pull output
tubes V9 and VI 0. A feedback circuit from
the output transformer secondary (R336
and R337) makes the pedal response more
uniform by reducing speaker resonance.
R336 is adjusted at the factory.

2-6. POWER SUPPLY (See Figure 5-4). - The

power supply uses a 5U4 rectifier tube
with conventional filtering circuit.

2-7. L-100A PERCUSSION VOICING CIRCUITRY
(See Figure 5-5).

2-8. MODE SWITCH - With the "Mode Switch"
in any of the reiteration positions, the
harmonics necessary to produce the
"Chime", "Guitar", and "Banjo" are all
fed into the "A" reiteration channel only,
while the "Marimba" and "Xylophone"
effects feed harmonics into both the "A"
and the "B" channels. This split into the
"A" and "B" channels only occurs with the
use of reiteration. Without reiteration, all
effects are routed into the regular percussion
system. The two reiteration channels are
identical. You will note that across the
secondary windings of the two input trans-
formers is located a field-effect transistor.
These gates Q300 and Q303, are fed alter-
nating pulses from a bistable multivibrator
which supplies alternate pulses to each one
of these gates. That is; one is On, while the
other is off. These gates shunt the signal
to ground, thereby making the channel
inoperative. These individual signals are
further amplified by a one stage transistor
amplifier, Q301 for the "A" channel, and
Q302 for the "B" channel. They are then
mixed together and fed to a common
amplifier, Q307, which in turn feeds this
percussion signal to the input side of the
swell pedal. The multivibrator which
supplies the keying pulse for these two
gates does not run continually, but rather
is turned off and on each time a key is
depressed on the upper manual. The multi-
vibrator consists of Q305 and Q306. The
multivibrator rate varies with the applied
base voltage. This voltage is applied through
the "Mode Switch" and R684 and R685.
Q304 provides the necessary switch pulse
to start the multivibrator.

NOTE

Whenever the reiteration is used,
it completely bypasses the percus-
sion section of the AO-42 amplifier.

With the "Mode Switch" in the "Normal",
"Vibrato", or "Delayed Vibrato" position,
the various pre-voiced percussions are
routed to a percussion preamplifier made
up of Q314 and Q313. These amplified
signals are then routed into the regular
Hammond percussion system at the col-
lector of Q201. With the "Mode Switch"
in the "Normal" position all percussion
voices sound as normal; that is, they have
no vibrato.

NOTE

To obtain the following vibrato
effects it will be necessary to de-
press one or both of the VIBRATO
tabs.

With the "Mode Switch" in the "Vibrato"
position, a portion of the percussion signal
is taken from the input side of the Expres-
sion pedal and routed through R670, the
"Mode Switch", and is then fed to the grid
of VI A (Pin 2). Here the percussion voices
are amplified and fed to the vibrato phase
shift amplifier. All voices so routed now
appear with vibrato.

With the "Mode Switch" in the "Delayed
Vibrato" position, a portion of the percus-
sion signal is taken from the input side of
the Expression pedal, and routed to a
voltage divider made up of R682 and R681.
This weak signal is fed to the base of Q3 1 2.
It will be noted that the emitter of this
stage is not bypassed and that the output
of this stage is relatively low. During keying,
after a predetermined time lag (.5 seconds),
the charge on C631 is depleted by Q308
and Q309. With this charge depleted, Q308
and Q309 stop conducting and their
respective collectors assume the supply
potential + 1 2V. This + 1 2V. from the
collector of Q309 is now applied to the
base Q3 1 0, thereby placing Q3 1 0 and Q3 1 1
in a state of conduction. With Q31 1 now
conducting, C633 is placed across the
emitter resistor of Q3 1 2. This materially
increases the gain of this stage, and as the
percussion is dying away, feeds this ampli-
fied portion of the fading percussion signal
through the "Mode Switch", and R683 to
the grid of VI A (Pin 2). There the signal
is amplified and fed to the Vibrato Phase-
Shift amplifier. All voices so routed now
appear with a vibrato tail-off.

2-3

Two positions of the "Mode Switch",
"Vibrato", and "Delayed Vibrato" also
effect the normal Hammond percussions
when they are in use (See Note above).

FREQUENCY DIVIDER - When using the
"Chime" voice, it is necessary to create a
1-1/4 harmonic for the proper reproduction
of the "Chime" tone. This is accomplished
by routing the 5th harmonic into an ampli-
fier made up of Q315 and Q316. Q317
rectifies and further amplifies this pulse
which is then fed to a two-stage frequency
divider, made up of Q318, Q319, Q320,
and Q321. The output of this second
frequency divider is then routed back to
the "Selector Switch", and is used as one
of the harmonics in the "Chime" voice.

NOTE

Because a frequency divider can
handle only one frequency at a
time, any attempt to play two or
more "Chime" notes at a time will
result in distortion.

2-12. CYMBAL KEYING. - Anytime a pedal is

depressed, the pedal signal is routed to the
pedal drawbar. A portion of this same signal
is also fed to Q327 and Q328. These stages
amplify and shape the signal and feed it
through R61 2 to the base of Q330, and
through R613 and D205 to a R/C storage
network and the base of Q329. The signal
developed across R616, the emitter resistor
of Q330, is rectified by D204 and this posi-
tive voltage is applied to the base of Q33 1 ,
the "Cymbal" gate, turning it on. At the
same time, the output of Q328 is being
rectified by D205 and slowly applied to the
base of Q329. When Q329 is biased into
conduction it depletes the base bias nor-
mally supplied to Q330 through R612 and
Q330 stops conducting. In this state, no
signal is available at the emitter of Q330
to be rectified, and Q331, the "Cymbal"
gate, slowly turns off. To the base of this
"Cymbal" gate is also fed the noise from
the noise generator, Q324. This noise is
tuned in the collector circuit of Q33 1 and
fed to Q325 and Q326 the "Cymbal and
Brush" amplifier.

CYMBAL AND BRUSH - The "Cymbal-
Brush" switch when in the "off" position
disables the keying functions necessary to
produce the "Brush" effect. With the
"Cymbal-Brush" switch in any one of the
"on" positions, the 8th harmonic of the
lower manual is disabled and this harmonic
busbar is used for keying the "Brush" effect.
The pedal signal (keying) contact is used to
activate the "Cymbal" effect each time a
pedal is depressed.

BRUSH KEYING - With the "Cymbal-Brush"
switch in any of the ON positions, the base
of Q322 is routed now to the 8th harmonic
busbar in the lower manual. Anytime a key
is depressed, the base voltage of this tran-
sistor is routed to ground, and this stage
stops conducting. The attendant rise in
collector voltage is impressed on one plate
of C608. The other plate of C608 responds
by driving excess electrons off to ground
through resistor R624. The resultant posi-
tive voltage is then fed through D203 to the
base of Q323, the "Brush" gate. To the base
of this "Brush" gate is also fed the noise
from the noise generator Q324. This noise
is now tuned in the collector circuit and
fed to the "Cymbal and Brush" amplifier
which consists of Q325 and Q326.

2-13. BRUSH AND CYMBAL AMPLIFICATION. -

After being amplified by Q325 and Q326, the
"Brush and Cymbal" signals are routed to a
voltage divider consisting of R604, R605, and
R606. It is then tapped by the switch and
routed to R602 the overall level control.
This is located on a terminal strip on the
lower organ shelf, near the AO-43 ampli-
fier. The wiper of the overall level control
(R602) now feeds into the AO-43 ampli-
fier through R601 and C318 to Pin 7 of
V8. To enhance the "Brush and Cymbal"
effects, a small high frequency speaker is
attached to the main amplifier. It is located
under the lower right hand end block on
the organ.

2-14. POWER SUPPLY. - Power supply chassis is
supplied with +340 volts DC from AO-43
amplifier. + 80 volts required for percussion
assembly is obtained from voltage divider
R690, and R69 1 . + 1 2 volts is obtained
from Zener Diode D201.

-16. POWER SUPPLY (See Figure 5-7). -

Power supply components are located in
the power supply chassis assembly (1 27-7

thru —9). All necessary DC supply voltages
for the rhythm unit are supplied by this
chassis. The output voltages are 30 V DC,
1 5 V DC, and 5.5 V DC. The 5.5 V output
is not used in the Model L- 100-1 organ.

1 20 V AC 50/60 Hz is supplied to the
power transformer from an external source.
The secondary AC voltage is 40 V AC,
which is then rectified by the full wave
bridge of diodes D 1 00, D 1 0 1 , D 1 02 and
D103. This DC voltage is then filtered by
the combination of R101, R103, C100A,
C101 and applied across the 30 V DC Zener
diode D104. The 30 V DC is the supply
voltage for the amplifier stages Q106,
Q107 and Q108 on the rhythm PWB and
the reference voltage for the 1 5 V DC and
5.5 V DC supplies. The 30 V DC is supplied
to the voltage divider of R107 & R108 and
fed to the voltage regulators Q100 & Q102,
the output of which is the 1 5 V DC which
is used to supply all other circuits on the
rhythm device.

The 30 V DC is also supplied to the voltage
divider R106 & R105, and fed to the
emitter follower Q101, the emitter output
of which is 5.5 V DC. Q101 is used as a
voltage regulator and in conjunction with
C100B provides the filtering for the 5.5
VDC.

PUSH BUTTON CIRCUITS (See Figure 5-6).

One side of each push button is connected
thru R200, 2.2K ohm resistor to the 15 V
DC supply. The 1 5 V DC is available to the
push buttons at all times, and if one is de-
pressed at any time, that particular voice
will appear at the output. When any of the
push buttons is depressed, that button
applies 1 5 V DC to the base input of a
phase shift oscillator.

As an example, if the BLOCK push button
is depressed, 1 5 V DC is applied to the
junction of R100B and capacitor C100B.
This signal is differentiated by C100B and
the resulting pulse is fed thru D100B and
R105 to the base of Q100B, turning it on.
This signal is fed back to the base, inverted
by the phase shift network C103B, C102B,
C104B, R106B, and R107B, and will be
regenerative for a period of time determined
by R100B, C100B, and R101B. The decay-
time of the collector output depends upon
the values of C101B, R105Band R102B.
The output is coupled through capacitor

C105B, resistor R104B, and capacitor CI 20
to the base of amplifier stage Ql 07, and
after amplification by Ql 07 and Ql 08, it is
connected to R203, the volume control.
TOM-TOM, BONGO, and CLAVES are
similar in operation. The frequencies of the
oscillators are determined by the values of
the components in the phase shift network.

When the BRUSH push button is depressed,
+ 15 V DC is supplied to the junction of
Rl 16 and CI 1 1 , and this supplies bias
through D102 to the base of Q103, turning
"on" the one shot multi-vibrator stage,
Q103 and Q104 for one complete cycle.
The Brush Gate transistor Q105 is turned
"on" for a period determined by CI 13 and
Rl 20 of the multi-vibrator stage. This
applies positive bias through R123, D104,
Rl 24 to base of Q 105, turning on Ql 05
and allowing white noise to appear on col-
lector of Ql 05, tuned by CI 15 and LI 01,
and this signal is then routed through CI 1 7
and output level control R126 and Rl 27
to hiss amplifier Q106.

2-18. LOWER MANUAL KEYING CIRCUITS (See
Figure 5-6). - The lower manual buss line
is connected through CI 24 and the base of
Q109, which is a pulse amplifier stage. Re-
sistor R147 provides base bias to the stage,
so that with no key depressed, the collector
is at approximately 4.5 V DC. CI 24 and
R145 is a differentiating network which
puts a pulse on the base of Q 109. This
pulse is amplified by Q109, and instanta-
neously the collector of Q 109 rises from
4.5 V DC to approximately 1 1 V DC. This
change is routed through R 149 to the base
of QUO, which at an emitter voltage of 5.5
V and base bias of 4.5 V was "off". With
1 1 V on its base, Ql 10 turns "on", and
its collector, which was at 1 5 V drops to
5.5 V. This change is coupled through CI 26
and Rl 53 to the base of Ql 1 1 , a PNP
which has been biased "off" through Rl 52
and Rl 53. The change in bias turns "on"
Ql 1 1 and the collector has an instanta-
neous output of + 1 5 V DC of about 2
milliseconds duration. This trigger pulse
is defined as the lower manual trigger pulse.
The pulse is routed through whichever
LOWER tabs are "on" to trigger the
selected voices. Output is obtained as
described in Paragraph 2—17.

2-19. PEDAL KEYING CIRCUIT (See Figure

5-6). - A signal of approximately 75 mV

2-5

P-P from the pedal keyboard is connected
to the input T4. The first two stages using
transistors Ql & Q2 are basically ampli-
fiers providing a + 1 3 V square wave pulse
for each input cycle. The first + 1 3 V
square wave pulse appearing on transistor
Q2 collector turns on Q4 providing a + 1 3
V pulse at output terminal Tl 1 . At the
same time C4 is charged through R6. This
charging time is long enough to delay the
conduction of Q3 until after the first pulse;
then Q3 conducts, cutting off Q4 before the
second pulse can be passed. Effectively,
each time a signal is applied to the input at
T4, one pulse appears at the output termi-
nal (Tl 1), which connects to terminal F of
voice generator board 124-000114. Ql 15
is normally off. The input at 'F' is fed
through R163 to the base of Ql 1 5 to turn
the transistor on. When Ql 1 5 is on, the DC
voltage at its collector drops from + 1 5 V
to Zero V. Note that pin 'G' is jumpered to
pin 'C, and that both are common to Ql 1 5
collector.

The signal entering pin 'C is fed through
R160 to the base of Ql 14, which is nor-
mally in the "on" condition with no pedal
pressed (collector at OV DC). When a pedal
is pressed, the negative signal applied to the
base turns "off" Ql 14, and the collector
voltage rises to + 1 5V DC. Point "D" is
routed to point "A" and coupled through
CI 27 and Rl 56 to the base of Ql 1 2. Ql 1 2
which is normally "off" is turned "on",
and its collector voltage drops to zero. The
collector signal of Ql 1 2 is then fed to the
base of PNP Ql 13, turning it "on", and its
collector switches to + 1 5 V DC. This + 1 5V
DC pulse on the collector of Ql 13 is desig-
nated as the pedal-down pulse, and is routed
through the BLOCK and/or CYMBAL tabs,
when "on" to trigger the selected voices.
Output is obtained as described in Paragraph
2-17.

SECTION III
DISASSEMBLY

3-1. GENERAL. - This section contains descrip-
tions of disassembly techniques peculiar to
L-100 Series organs.

3-2. ACCESS. - For access to some of the parts
discussed in following paragraphs, it may
be necessary to remove organ top, back,
or both.

3-3. UPPER MANUAL KEY. - To remove an
upper manual key proceed according to
the following.

a. Remove four screws which secure metal
cover on control panel assembly.

b. Remove two large screws located at
ends of control assembly, which secure
it to upper manual.

c. To remove a black key, loosen its key
mounting screw, lift control panel
assembly and lift out key.

d. To remove a white key, loosen its key
mounting screw and those of adjacent
black keys. Lift control panel, push the
keys back and lift out white key.

NOTE

If removal involves the lowest three
keys, it will be necessary to remove
or loosen drawbar assembly. See
Paragraph 3-6.

3-4. LOWER MANUAL KEY. - To remove a

lower manual key proceed according to the
following.

a. Remove four screws which secure metal
cover on control panel assembly.

b. Remove two upper manual mounting
bolts which secure manual assembly to

c. Remove two screws which pass through
angle brackets into upper manual. These
brackets are located inside of cheek
blocks. These screws are accessible from
front of organ.

d. Remove AO-41 and AO-42 amplifiers
from rear of upper manual.

e. Tilt manual up from front.

f. Using 1/4" box ratchet, loosen key
mounting screw.

g. To remove a black key, loosen its key

mounting screw; unhook key from screw
and lift out key.
h. To remove a white key loosen its key
mounting screw and those of adjacent
black keys. Unhook these keys from
screws, push them back, and lift out
white key.

3-5. DRAWBAR CONTACT SPRING. - To remove
a drawbar contact spring proceed according
to the following.

a. Remove four screws which secure metal
cover on control panel assembly.

b. Push drawbar all the way in.

c. Remove screw at back end of drawbar.

d. Pull out contact spring. To disconnect
spring entirely, unsolder wire.

CAUTION

Do not under any circumstances pull
drawbar forward while contact spring is
off, as damper spring will catch in slot
and necessitate removal of entire draw-
bar assembly.

3-6. DRAWBAR, DRAWBAR KNOBS OR DRAW-
BAR ASSEMBLY. - To remove any of these,
proceed according to the following.

a. Remove four screws which secure metal
cover on control panel assembly.

b. Unsolder black wire from "Full Organ"
tab switch.

c. Remove two large screws located at ends
of control assembly which secure it to
upper manual. Turn control panel face
up, and prop up in this position, being
careful not to stress wires.

d. Remove four hexagonal machine screws
holding drawbar assembly to base.

e. To remove knob, tilt drawbar assembly
up, and remove screw which holds knob.

f. To remove drawbar and contact spring,
pull them out at back of assembly, while
pressing with thumb to release pressure

g. To separate drawbar from contact spring,
remove screw at back end of drawbar.

h. To remove entire drawbar assembly,
unsolder all connecting wires.

manual proceed according to the following.

a. Remove four screws which secure metal
cover on control panel assembly.

b. Unsolder black wire from full organ tab
switch going to drawbar assembly.

c. Disconnect nine colored wires emanating
from right end of upper manual which
terminate at upper manual control tab
switches.

d. Dismount AO-41 and AO-42 amplifiers
from rear of upper manual.

e. Remove heavy grounding wire attached
to manual just to right of first key
channel.

f. Remove small bracket holding pedal click
filter to manual (grey wire from pedal
drawbar leads to this filter).

g. Remove two upper manual mounting
bolts which secure manual assembly to

h. Remove two screws which pass through
angle brackets into upper manual. These
brackets are located on inside of check
blocks. The screws are accessible from
front of organ.

i. Remove two screws securing control
panel to upper manual and tilt control
panel face up.

j. Remove four hexagonal machine screws
holding drawbar assembly to base.
Control panel and drawbar assembly can
be folded over and rest on top of
amplifiers.

k. Replace control panel mounting screws.

1. Prop up front of upper manual so that
its terminal strip is accessible. Be careful
when raising and lowering manual that
its terminal strip is not damaged by
rubbing lower manual keys.

m. Unsolder manual cable from terminal strip.
Lower manual into normal position.

n. Carefully lift manual assembly out of
console.

3-8. LOWER MANUAL. - To remove lower

manual proceed according to the following.

a. Perform operations a. through e. of
Paragraph 3-7.

b. Disconnect 9 colored wires emanating
from right end of lower manual which
terminate at lower manual control tab
switch.

c. Remove four screws from under manual
assembly (front) which secure terminal
cover.

d. Remove lower manual end blocks by
removing two screws through manual
frame and one screw through bracket on
cheek block.

e. Unsolder manual cable from terminal strip.

f. Tilt upper manual up from front. Remove
two hexagonal bolts that secure lower
manual to case work.

g. Loosen four hexagonal head studs
securing lower manual to front rail.

(In reinstalling manual tighten these last.)

h. Lift out lower manual.

3-9. GENERATOR. - To remove generator dis-
connect organ from power source, then
proceed according to the following.

a. Remove generator power panel cover.

b. Unsolder all wires on power panel except
yellow and grey wires to motor and
starting condenser.

c. Dress generator-to-manual cable and
generator-to-pedal cable down and un-
solder from terminal strip.

d. Unsolder grey wire which goes to pedal
click filter and remove heavy grounding
wire (black).

e. Remove four hexagonal bolts which
secure generator to mounting angles. Lift
out generator.

3-10. MOTOR. - To remove motor disconnect
organ from power source, then proceed
according to the following.

a. Remove generator power panel cover.

b. Unsolder grey wire to motor.

c. Unsolder red and black wires on starting

d. Compress coupling spring between motor
and generator and remove spring.

e. Force off spring clamp which secures
motor to mounting frame. Lift out
motor.

3-11. PEDAL KEYBOARD. - To remove pedal
keyboard proceed according to the
following.

a. Dress down generator-to-manual and
generator-to-pedal cables, unsoldering
latter.

b. Remove two screws in lower back of
console and three screws between ampli-
fier and front of console.

c. Lift console and pull out keyboard.
(When reinstalling pedal keyboard replace
two screws in back of console first,

3-2

leaving them loose until remaining screws
are replaced.)

3-12. SWELL ASSEMBLY. - To remove swell
assembly, perform steps a. through d. If
replacement of assembly is required,
perform step e.

a. Remove two leads with white coded ends
from preamplifier and main amplifier.

b. Remove four wood screws securing swell
housing cover to case and lift out cover.

c. Remove four screws securing swell pedal
assembly to case work. Swell assembly
is now loose and can be picked up and
removed from back.

d. Swell potentiometer can be removed at
this time if necessary and will require an
Allen 1/16" wrench.

e. Replacement for more dependable swell
operation can be made by ordering Part
Number 123-000021 from the factory,
and proceeding as follows.

1 . Remove Expression Control housing .

2. Unplug long shielded lead from Per-
cussion Amp. Chassis and short
shielded lead from Power Amp. Chassis.

3. Remove four screws securing Expres-
sion Control Chassis to floor of
cabinet.

4. Remove Expression Control as one

5. Place new Expression Control in posi-
tion and secure with original screws.

6. Plug long shielded lead into Percus-
sion Amp. jack and short lead into
Power Amp. Jack.

7. Using accompanying Terminal Strip,
splice two Brown wires from Expres-
sion Control into Blue & Gray 6.3 V
filament leads originating in 6 pin
rectangular plug on Power Amp.
Chassis. Secure Terminal Strip to
cabinet floor with small wood screw.

8. Replace Expression Control Housing.

NOTE

If swell assembly is replaced as
directed, circuitry will conform to
Figures 5-3 and 5-4.

3-13. TO REPLACE A BROKEN TAB. - Proceed
according to the following.

a. Remove four screws which secure metal
cover on control panel assembly.

b. Remove two Phillips screws from front
of control panel which hold bank of
switches associated with tab to be
replaced.

c. Remove lock washer from either end of
switch assembly, and pull rod out so it
just clears broken tab. It may be neces-
sary to tilt assembly so that free end of
rod will clear adjacent switch assembly.

d. Remove remains of broken tab and insert
new piece.

NOTE

A small bronze spring washer will be
found between tab and one side of
switch assembly. Be sure this is re-
inserted with new tab.

3-14. PILOT LIGHT OR POWER SWITCH. - Dis-
connect organ from power source, then
proceed according to the following.

a. Remove four screws which secure metal
cover on control panel assembly.

b. Replace bulb with No. 1 2 GE 6.3 V . 1 5 A
miniature 2 pin.

c. To replace power switch, unsolder two
black leads from generator power panel.

d. Compress springs on sides of switch and
push through front of control panel.

3-15. PERCUSSION CIRCUITRY, L-100A. - With
the exception of power supply and terminal
strip assembly, Figure 5-13, the percussion
circuitry is mounted on the lower left end
block. If access to end block circuitry is
required, remove control knobs before re-
moving end block from organ.

3-16. SIX-VOICE PERCUSSION CIRCUITRY.L-1 00-1

The power supply, 127-000007 and pedal
control board assembly, 063-042051, are
mounted on the left (rear view) wall of the
console.

The rhythm voice board, 124-0001 14, is
located on the bottom left (rear view) of the
console.

SECTION IV
PRACTICAL SERVICE SUGGESTIONS

4-1. GENERAL. - This section contains perform-
ance standards, adjustment procedures, and
troubleshooting information.

NOTE

Before making any checks or ad-
justments involving amplifiers, test
all tubes to be sure they are oper-
ating properly.

4-2. ORGAN PERFORMANCE CHECK. - To

prepare the organ for performance check
proceed according to the following.

a. Place all tabs in up (off) position.

b. Push drawbars in to limit of motion.

c. Set swell pedal for maximum output.

d. Connect meter to speaker terminals.

NOTES

At certain steps in the following
procedure, conditions other than
above may be specified. Return
controls to above conditions as
each step is completed.

Drawbars, pedals and keys are
called out by number, beginning
with No. 1, at left end of row.

4-3. EQUIPMENT REQUIRED. -

a. VTVM, Commander 870 or equivalent.

b. Oscilloscope, Tektronix 503 or
equivalent.

4-4. PROCEDURE. -

a. Depress UPPER DRAWBARS tab and
pull drawbar No. 1 to position 8. Play
lowest C, on upper manual (Frequency
25) and observe meter. If output is not
between 1.6V and 2V rms, adjust GAIN
ADJUST on power amplifier to bring
output into range.

b. Maintain conditions of step a. Depress
VOLUME SOFT tab. Output should drop
to range of 0.69 to 0.9 volts rms.

c. Set pedal drawbar at position 8. Depress
lowest C pedal. Output should be between
4Vand 5.5V rms.

NOTE

If output is not within specified
range, select Rl, Figures 5-1
through 5-4, from 1.8ft to 27S2
to bring output into range.

d. Maintain conditions of step c. Depress
VOLUME SOFT tab. Output should drop
to 0.8V to 1.5V rms.

e. Return VOLUME SOFT tab to "up"
position. Maintain other conditions of
step c. Play all pedals to be sure output
changes smoothly from note to note.

f. Make upper manual preset listening check.
Hold down F, A, C chord near center of
upper manual.

1 . Trumpet. Set up upper drawbars to
00 6688 888. Press TRUMPET preset
and then UPPER DRAWBARS preset.
The musical quality should be identical.

2. Clarinet. Set up upper drawbars to

00 8080 800. Press CLARINET preset
and then UPPER DRAWBARS preset.
The musical quality should be identical.

3. Full organ. Set up upper drawbars to
86 8868 446. Press FULL ORGAN
preset and the UPPER DRAWBARS
preset. The musical quality should be
identical.

g. Make lower manual preset listening check.
Hold down F, A, C chord near center of
lower manual.

1 . Set up lower drawbars to 6644 222.

2. Press ENSEMBLE preset and then
LOWER DRAWBARS preset. The
musical quality should be identical.

h. Percussion cutoff control and output
checks.

1. Cut-off. With only THIRD HARMON-
IC, FAST DECAY, and UPPER
DRAWBARS tablets depressed and
all drawbars pushed in, hold down
lowest C key on upper manual and
adjust percussion cut-off control on
preamplifier chassis to point at which
output signal is just barely audible.

2. Output voltages. With only UPPER
DRAWBARS and SECOND HAR-
MONIC tablets depressed, press lowest
C key on upper manual. Output volt-
ages across speakers should be between

4-1

3.0V and 5.5V rms. With PERCUSSION
SOFT tablet depressed, output should
be 1.5V to 2.8V rms.
i. Vibrato check. Depress FULL ORGAN
tab. Hold down F, A, C chord near center
of upper manual. Depress VIBRATO
SMALL tab and observe vibrato effect.
Then, in addition, depress VIBRATO
NORMAL tab. Vibrato effect should
increase. In addition, press VIBRATO
CHORUS tab. Vibrato effect should be-
come more pronounced.

NOTE

Later organs, Figures 5—2 through
5-4, are equipped with vibrato
width potentiometer R131. Ad-
just if vibrato effect is too narrow
or too broad.

j. Reverberation check. Depress FULL OR-
GAN tab. Hold down F, A, C chord near
center of upper manual. Add REVERB I
tab. Observe that reverberation is heard
as chord is played and released. Add
REVERB II tab. Reverberation should
be increased relative to REVERB I tab
as chord is played and released.

k. Microphonics and Hum check.

1 . Tap each tube and replace it if there
is ring or howl in the speaker with
expression pedal maximum and
VOLUME SOFT tab not depressed.

2. Hum in speakers with expression pedal
maximum and VOLUME SOFT tablet
not depressed must be very low in vol-
ume and not measure more than 1 5
mV rms. If hum is excessive, see para-
graph 4-22.

NOTE

On L- 100-2 the SILENT-SOUND
tab on Rhythm II must be in SI-
LENT position.

VIBRATO. - To check vibrato proceed ac-
cording to the following.

a. Pull out upper manual 2' drawbar to
position 8. All other drawbars in. De-
press UPPER DRAWBARS tab.

b. Remove the phono cable from the BN.
phono jack located on the preamplifier
chassis. Connect the scope VERTICAL
INPUT to the phono plug removed.

c. Remove the phono cable from the BK.
phono jack located on the vibrato phase
shift amplifier. Insert into the BK. phono
jack an adapter with two phono jacks

and one phono plug. Reconnect the
phono cable (black) into one of the
adapter phono jacks and connect the
scope EXT. TRIGGER IN binding post
to the remaining adapter phono jack.

d. Set scope controls as follows:

1. TRIGGER: SOURCE - EXT.,
COUPLING - AC; SLOPE +

2. HORIZONTAL SWEEP - 0.2 msec/cm.

3. VERTICAL SENSITIVITY - 0.2
volt/cm.

e. Hold down key #7 (frequency #60) on
the upper manual.

f. Adjust the TRIGGER LEVEL control
for a stable pattern.

g. Adjust the VARIABLE sweep time
control until one complete sinewave
covers 4 cm.

h. Adjust the VERTICAL VARIABLE con-
trol for a display height of 4 cm.

i. Depress the VIBRATO NORMAL tab.
Adjust the VIBRATO WIDTH control
for a total phase shift swing of 2 cm.
(refer to Figure 4- 1 ). If VIBRATO
WIDTH control does not give satisfactory
result, select R133, Figure 5-1 through
5-4 between 22012 and IK.

Figure 4—1. Vibrato Adjustment Waveform
NOTE

Phase shift can be read best if
waveform is centered so that the
center peak of the sinewave coin-
cides with a graticule line.

j. Release VIBRATO NORMAL tab. Single
wave must be centered ± Vi cm. as shown
in Figure 4— 1 .

k. Disconnect external leads and adapter.
Reconnect phono cables to proper jacks.

If an oscilloscope is not available, make the

following listening test.

Depress FULL ORGAN tab. Hold down
F, A, C chord near center of upper man-
ual. Depress VIBRATO SMALL tab and
observe vibrato effect. Add VIBRATO
NORMAL tab and observe increased
vibrato. Add VIBRATO CHORUS tab
and observe that vibrato effect becomes
more pronounced.

L-100A PERCUSSION PERFORMANCE
CHECK. - To check performance of
L-100A percussion unit, whether factory
installed, or added as a kit, proceed accord-
ing to the following,
a. Selector Switch Operation

1 . With selector switch in DRAWBARS
position, cymbal-brush switch OFF,
mode switch in NORMAL position,
organ function should be normal.

2. DRAWBARS position - with upper
manual DRAWBAR tab depressed and
holding down middle C key, pull out
all drawbars in order, starting with the
highest one. Note that pitch of sound
goes down each time with the excep-
tion of sub-3rd drawbar. Return upper
DRAWBAR tab to OFF.

3. Percussion level - with mode switch in
VIBRATO position, selector switch in
Marimba position, lower manual DRAW-
BAR tab depressed and lower drawbars
registration 8800 000 and swell pedal
maximum loudness, the level is checked
by comparing level of upper manual to
level of lower manual when depressing
middle C and E keys in a percussive
manner. Level should be approximate-
ly equal. Variation heard in level in the
reiteration, normal, and delayed vibra-
to positions of the mode switch are
normal. Notice a decrease in level when
PERCUSSION SOFT tab is depressed

in all but reiteration modes.

4. Percussion voices of the selector switch
are checked for harmonic content by
comparison with lower manual regis-
tration. Play middle C and E keys
except when comparing chimes which
should be checked using middle C key

5. CHIMES should be identical to drawbar
registration 0888 000, except that
1-1/4 harmonic will be missing from
the drawbar registration.

6. GUITAR should be identical to regis-
tration 8088 800.

7. MARIMBA should be identical to reg-
istration 8800 000.

8. XYLOPHONE should be identical to
registration 8080 000.

9. BANJO should be identical to regis-
tration 0888 800.

NOTES

When the harmonic is used to form
the percussion voice, then the cor-
responding drawbar on the upper
manual and (keying) drawbar #8
will be inoperative.

In CHIMES position, drawbar #7
will also be inoperative.

CHIMES & GUITAR decay time
approximately 3 seconds, other
percussion voices slightly less than
1/2 second.

In VIBRATO & DELAYED VI-
BRATO positions of mode switch,
all percussions will have the long
decay time (3 seconds).

b. Mode Switch Operation (Vibrato
Functions)

1. All control panel tabs and drawbars
in OFF position.

2. Selector switch to GUITAR position.

3. Mode switch NORMAL position - play
chord on upper manual and notice
absence of vibrato effect.

4. Mode switch to VIBRATO position,
depress vibrato normal tab - play chord
on upper manual and notice vibrato
effect.

5. Mode switch to DELAYED VIBRATO
position - play chord on upper manual
and notice that vibrato effect begins
approximately .6 of a second delayed
in time, after chord is pressed.

c. Mode Switch Operation (Reiteration
Functions)

1. Selector switch to CHIME or GUITAR
position.

2. Mode switch to FAST position, and
pressing key on upper manual produces
a reiterative sound, repeating at the
rate of approximately 1 1.2 HZ.

3. Mode switch to MEDIUM position -
playing as above, produces a reitera-
tive sound with rate of approximately
7.7 HZ.

4. Mode switch to SLOW position - play-
ing as above, produces a reiterative
sound with rate of approximately

5.4 HZ.

5. Notice that if selector switch is turned
to MARIMBA or XYLOPHONE posi-
tions, a reiterative sound of different
quality is heard. The two harmonics
used in these voices are turned on and
off at opposite times. This is known as
"alternate reiteration",
d. Cymbal-Brush Switch Operation

1. With lower manual DRAWBARS tab
switch depressed, and CYMBAL-
BRUSH switch off, lower manual
drawbars should function normally.

2. With CYMBAL-BRUSH switch to any
on-position, drawbar #7 will be
inoperative.

3. With lower manual DRAWBAR tab
up, and Brush & Cymbal switch in
LOUD position, depress BRILLIANCE
tab, playing any lower manual key
repeatedly (other than highest 6 keys
on right-side of manuals). The result
should be a percussive hiss sound of

1 .0 V ± 3 db rms measured across
12" speaker leads. R602 may be
adjusted to obtain the proper levels.
R602 is located on terminal strip
assembly, AO-31213-1.

4. With Cymbal and Brush switch in
LOUD position, play any pedal repeat-
edly, and notice percussive hiss sound
of 1.25 V± 3db rms.

5. Notice that when BRILLANCE tab is
turned off, volume of Brush and Cym-
bal is decreased.

d. Press BRUSH push button at about 5
times per second. Adjust R126 to ob-
tain a meter indication of 2.2 to 2.8 V

e. Press TOM-TOM push button at about
5 times per second. Adjust R 134 to ob-
tain a meter indication of 1.3 to 1.7 V

4-9. ONE VOICE IS SILENT. - Check the
following:

a. Connection to corresponding pin of PWB,
124-0001 14, See Figure 5-6.

b. If connections O.K., check for +1 5 V DC
at pin when push button of missing voice
is held down.

c. If voltage is missing, check connections
to push button switch, rocker tab, and
rhythm power supply.

d. If voltage is present, trace associated
voice circuitry.

NOTE

If failure is in Brush and/or
Cymbal voice, check Q 1 0 1 .

4-10. PROGRAMMED VOICE DOES NOT SPEAK. -

If any voice speaks when push button is
pressed, but not from programmed source
(manual or pedal, as applicable), check
rocker switch and associated wiring. See
Paragraphs 4-13 and 4-14 also.

4-7. L-100-1 SIX-VOICE PERCUSSION PERFORM-
ANCE CHECK AND TROUBLESHOOTING.

4-8. OUTPUT LEVEL ADJUSTMENTS!.- The

rhythm volume levels are set at the factory,
and will normally require no adjustment. In
case it is found necessary to replace a part
on the rhythm board, 1 24-0001 14, adjust-
ment will be required. To adjust output
levels, proceed according to the following.
A VTVM, Millivolt Commander, Model
870, or equivalent is required. See Figure
5—6 for locations of controls.

a. Set all tabs and rocker switches to "up"
or "off positions. Set swell pedal and
RHYTHM VOLUME control to maxi-
mum output.

b. Connect VTVM across main speaker
leads.

c. Press CYMBAL push button at about 5
times per second. Adjust Rl 1 3 to obtain
a meter indication of 2.2 to 2.8 V rms.

4-11. ALL PERCUSSIVE VOICES SILENT. - (Hiss
voices speak.) Check Q107, Q108, and
associated circuitry.

4-12. BOTH HISS VOICES SILENT - (Percussive
Voices Speak.) Check Q106 and associated
circuitry. Check Ql 01.

4-13. NO VOICE RESPONSE FROM PEDALS. -

Check pedal keying pulse circuits. Para-
graph 2-19.

4-14. NO VOICE RESPONSE FROM MANUAL. -

Check manual keying pulse circuits. Para-
graph 2-18.

4-15. NO PERCUSSION OUTPUT. - Check con-
nections to percussion power supply. Check
power supply outputs.

4-16. TROUBLESHOOTING.

4-17. ORGAN DOES NOT PLAY. -

a. If the generator motor is not turning and
the tubes do not light when the switch is
in the "on" position, check the power
wiring, power switch, line cord, line cord
plug, and wall outlet.

b. If the generator turns and the tubes light,
but no sound can be obtained with all
controls in playing position, the most
likely source of trouble is the amplifier.
In most respects this is a conventional
amplifier circuit, and the schematic dia-
grams, Figures 5-1 through 5-4, will
enable the service man to locate the
trouble.

4-18. KEY DOES NOT PLAY OR HARMONIC

IS MISSING. - This may mean a dirty key
contact, a broken connection, or a dead
note in the generator. The steps below
will serve to isolate the trouble.

NOTE

Checks a through i, following,
must be performed with the
DRAWBARS tab depressed.

a. Ordinarily only one of the several frequen-
cies used on the key will be missing. This
can be determined by holding the key and
operating each drawbar for that manual,
observing on which drawbar the key fails
to play. Reference to the manual wiring
chart, Figure 1-7, will tell which fre-
quency number is missing.

b. See whether the same frequency is miss-
ing where it is used on other keys of the
same manual. The wiring chart will tell
with what other key and what other
drawbar you should get the same fre-
quency. If it is missing on one key but
not on others, a key contact is probably
dirty. In some cases it may be cleared
by striking the key 1 5 or 20 times in a
rapid staccato manner to loosen the dirt.
If this procedure is not effective, adjust-
ment of the busbar shifter for that manual
will clear it. (See paragraph 1-5.) This
will slide the busbars endwise so they
present a clean contact surface. In extreme
cases, it may be necessary to hold down
the faulty key while making the
adjustment.

c. If the frequency is missing on all keys of
one manual but not on the other manual,
look for a break in the cable connecting
one manual to the other.

d. If the frequency is missing on both

manuals, check the manual-to-generator
cable or the generator itself.

e. The output of any single frequency on
the tone generator may be checked by
pulling out any drawbar and connecting
a clip lead from the back end of the
drawbar to the generator terminal in
question. See figure 6 for location of
all generator terminals. If the generator
is all right, the note will play loudly.

CAUTION

Never test the tone generator
with an outside source of current
such as a continuity meter, as
serious damage may result to
the sensitive filter transformers
and permanent magnets. By the
above method, all necessary tests
of the tone generator may be
made with the current supplied
by the generator itself.

f. If it fails to play, try touching the clip to
the input side of the filter coil (not the
grounded tap) and the input side of the
filter condenser (Figure 1 -6) in order to
check these parts. Disconnect the con-
denser to eliminate the possibility of a
grounded transformer. If the signal is
still missing at the magnet coil terminal,
it means that the tone wheel is not
turning, the coil is defective, or the
magnet is not properly adjusted.

g. If the tone wheel is not turning, the
frequency of the other wheel on the
same shaft will also be missing (with
the exception of a few wheels which
are alone). On the generator magnet
location drawing (Figure 1-5), the two
frequencies whose numbers are connected
by a dotted line are on the same shaft.
Another way to check the wheel is to
remove the dampening pad under the
generator (it is held by the two long
channels which form the generator frame)
and feel the wheel with your finger to see
if it is turning. Each wheel is located di-
rectly behind its magnet, shown in
Figure 1-5.

h. If the magnet coil is defective, the
generator must be returned to the
factory, as replacement of a coil necessi-
tates dismantling the entire generator.

i. It is possible, although unlikely, that the
magnet may have become loose and
moved so far from the wheel as to make
the note inaudible. It may be adjusted
as described in the following paragraph.

4-5

SECTION V
DIAGRAMS

5-1. GENERAL. - This section contains schematic diagrams to illustrate the text and provide information
necessary to proper organ servicing.

5-1

CO

or

Q
K

to

6ENCRAT0RS
T^il'cVpXuiT

LOWER MANUAL DRAWBARS

HAAMONIC rUMO

UNO 2ND 3RD 4TM5TH6TH |TH NJIKL KAW&AK I J«TfflpfU!fi) ZNO 3RD 4TH 5TH 6T>< 6TH

UPPtR MANUAL DRAWBARS

DRAWBAR Rub

2ND 3RD ^TH 5TH 6TH ftTH INTENSITY TERMINALS

GENERATORS
4446 USE
THIS CIRCUIT

GENERATORS
iA-43 USE
THIS cmcuiT 1

— r (IS)

PRE- AMPLIFIER

MATCHING

TRANSFORMER.

TZOI

-GAIN 7ZXS130CP5-

VIBRATO PHASE SHIFT AMPLIFIER

REVERBERATION < POWER AMPLIFIER

ONLY ONE OrTHEJE TWO
TABLETS MUST it DERRISSEO
AT A TIME

. GENERATOR
TERMINALS

r^EOUENCIES 14 THRU 17 OMITTED

2ND H ARMONIC

R40j

471

3RD HARMON IC

»4

PIRCUSSK

i uiiu u u u s

C C* 0 0* E f ?*& S*A A*B C

" "reoal switch

SECC
HARM*

PERCUSSION
Off

ON

ONIC

ONLY ONE Of THESf FOUR
TABLETS MUST BEDERRESSEO
ATA TIME

THIS PORTION OF ROWER SUPRLY
LOCATE 0 IN RREANP CHASBlS

PERCUSSION e PRE- AMPLIFIER

VIBRATO AMPLIFIER

REVERBERATION ANO POWER AMPLIFIER

VII RED VI

vig sw

o o

o o

C3* C3i6 ^

C3«7 C3I8 -s -

VlO

a O

r.OMPQN tNT LOCATIONS

lOOJtRlEJ CDMTONLNTS LOCAT?°
EDO SERIES COMPONIMTJ LOCA T r ...

IN VIBRATO CKxiij
lOO«R.ti COMPONENT* ^CA^"^*™™^;*
SOCSCIlESCOMROMENTJ LOCATEf CON^TWL TAJ^T^ AB1X
400Wf3C0*^»NfNTJ LOCATE T H ^IM^^Sl^K

soosEJ^samfOMtNTs located ^ tXP " lM>ow

ALL SWITCHES XNOW*
ALL VOLTMES SHOWN
WHCIE NOTED.

Off RO4ITI0W.
PROM BROUNO EXCEPT

FIGURE 5-2.
SCHEMATIC DIAGRAM,
L-100 ORGAN WITH
AO-47 AMPLIFIER

7l7 V0LTA4EJ* MEASu! C0 2*000 OHMB-

PRESSED.

MODEL L101 CONSOLES SERIAL #41622 AND ABOVE ) C-402 BRILLANCE
MODEL L102 CONSOLES SERIAL #4202* AND ABOVE \ CAPACITOR ADDED.
MODEL L103 CONSOLES SERIAL #43102 AND ABOVE ) NO TABLET

+ AC VOLTA«l MEASURED WITH
PRESSED/ SOLO BRAWBAR' TAR4.E"
OftftWltfft AT POS/TlOK t> AMD EX PRE
t * AC VOLTA6ES MIASUREO WITH Li
PRESSEt'SOLO 0MW%AR»AND'a
TABLETS ONLY BE PRESSED*
DISCONNECTED. fcSED.

«•« Vibrato normal' tablet OEPi t,fttD '

T UTPER MANUAL C MET
LY DEPRESSED, l«r BROW*
M RE DAL AT MAXIMUM.
T URRtR MANUAL C KEY
RMO NIC PERCUSSION^
RBY HEYINC WIRE

5-3

REVERBERATION < POWER AMPLIFIER

6AIN 401 e 13096

THIS portion or *ower JUPPLY

LOCATEO IN MCAMf CHASSIS

lOOJERlES COMPONENTS LOCATED IN VI IRA TO CHASSIS
tOOSERlES COMPONENTS LOCATED IN PERC-E PREAMP CHASSIS
aooSCffiU COMPONENTS ...OCATED IN REVERft < POWER CHASSIS
♦0CSJR1ES COMPONENTS uOCATTO IN CON UROL TABLET ASSY.
SOO SUES COMPONENTS uOCATEO IN EXPRESSION PEDAL ASSY

FIGURE 5-4.
SCHEMATIC DIAGRAM,
L-100A, L- 100-1 & L- 100-2
ORGAN CONSOLE

MODEL 1 101 CONSOLES SERIAL * 41622 AND ABOVE
MODtL LIOZ CONSOLES SERIAL * 4202* AMD ABOVE
MODEL LI03 CONSOLES SERIAL * 43102 *ND ABOVE

CHEMATIC DIAGRAM L-IOO SERIES
(WITH AO-47 VIBRATO AMPLIFIER)

ALL SWITCHED iNOWN m OfT POSITION.
ALL VOLTAGES S> HOWM ARE ♦ FROM GROUND EXCEPT
WHERE NOTTDu

ALL V0LTA4EJ MEASURED WITH 20,000 OHMS -
PER- VOLT METTIR, ANO NO KEYS OR PEDALS
PRESSED.

♦ AC VOLTAGES MEASURED WTtTH LOWEST UPPER MANUAL C KEY
PRESSED,' SOLO DRAWBAR* TA*LETX>NLY DEPRESSED, i«t RPOWN
ORAWGAR AT POSTTION 6\ ANC EXPRESSION PEDAL AT MAXIMUM,
t * AC V0LTA6ES MEASURED WITH LOWEST UPPtP MANUAL C KEY
PRESSED/SOLO DRAWBAR* A*MO'E NO HARMONIC PERCUSSION*
TABLETS ONLY DEPRESS* 0, AND 6REY KEYING WIRE
DISCONNECTED
• MVlMATO NO«MAt'TA»LrT0tPR«SE0.

5-5

, 0 ~\ | ■ Q Qs»,£iC

~- \#7Q4 U ■

ceil I

L-100A PERCUSSION UNIT

124-000119

C 100.

Ow

WHIM

no q- ftttv o 6 0 o-EHK> Q

wo (HEUDO.

C H r 1 6 o H O O (g «Q 60

we-o- EID -o QjO

«w-Q- Q- Tr 1 6 3 hQ ^iu

oKllID-o

w iseoK il^>o
o-EH3o

Hi

Q 4_R1 66h Q

5*

CI 29

f ,i0 N..6 LOW FREQ.

SCHEMATIC DIAGRAM CORRECTIONS

TO CORRECT THE SCHEMATIC
DIAGRAM FOR PROPER SERVICING
THE FOLLOWING CHANGES HAVE
BEEN MADE.

1. CALL OUT CHANGE:
R163 CHANGED TO Rl 68
R164 CHANGED TO R169
R165 CHANGED TO R167
R114 CHANGED TO R141

2. TOLERANCE CHANGE:
R102, R102A, R102B,
R102C, R165 CHANGED TO 55

3. VALUE CHANGE:

R107 CHANGED TO 27K

4. CALL0UT AND VALUE INTERCHANGE:
R107-27K WITH R106-22K
R107A-39K WITH R106A-15K
R107B-18K WITH R106B-22K
R107C-22K WITH R106C-22K

LOW FREQUENCY OUTPUT-
TO CONSOLE

HIGH FREQUENCY OUTPUT
TO CONSOLE

NOTES:

1. -^< SYMBOL DENOTES PUSH-ON TERMINALS A ~0~ • PINS.

2. UNLESS OTHERWISE SPECIFIED:

ALL RESISTORS ARE IN OHMS, i 10X, 1/2 MATT;
ALL CAPACITORS ARE IN MICROFARADS.
I, 200 SERIES COMPONENTS LOCATED IN END BLOCK ASSEMBLY.

4. T-200-1 .2 CONSOLE SERIES JUMPER REOUIREO BETWEEN A TO 0 . PEDAL INPUT C.

5. PINS 2,4.8,8 FACTORY TEST POINTS ONLY.

b. L-100-1,2 CONSOLE SERIES JUMPER REQUIRED BETWEEN A TO 0, AND C TO 0. PEDAL INPUT TO F.

7. N-100, N-200. N-JOO CONSOLE SERIES JUMPER REQUIRED BETWEEN 98 TO E, AND A TO G
WITH PEDAL INPUT TO F.

8. WAVE FORMS OF TOM TOM, BONGO, BLOCK AND CLAVES AT TERM. #18.

9. WAVE FORMS OF BRUSH & CYMBAL AT TERM. #1J.

FIGURE 5-6A
SCHEMATIC DIAGRAM
AND PARTS LAYOUT,
L-100-1 SIX-VOICE PERCUSSION,
EARLY 1970 PRODUCTION

5-8

5^5 So* oo*

power supply chassis

Izlz (\27-oooocrr m?u 000003)

Figure 5—7. Schematic Diagram, L-100-1 Percussion Power Supply

063-04205)

PART NO.

ITEM
NO.

PART NAME

REMARKS

OOb-041578

1

TERMINAL BOARD ASSEMBLY

2

F

— ±-4
3 J

CAPACITOR, TANTALUM

C1 1.0 MFD.

414-000012

4

CAPACITOR. TANTALUM

C2.C3.C4 .10 MFD.

5

47S-O10392

6

CAPACITOR, CERAMIC

C5 390 mrrvfd

.

425-010232

7

CAPACITOR. CERAMIC

C6 82 rtxm

LA

15

a

o

rfiPflf 1 TOR CERAMIC

m t <*

400 - OZ IO | t

9

i

600-020571

10

RESISTOR, FIXED

R16

2200 0

OUTWW7I

11

resistor FIXED

R1

1 nm n

3

600-020971

12

RESISTOR, FIXED

R3.R4.R7

100K

2

600-020731

— — —

13

RESISTOR, FIXED

R5.R10

10 K

i

600-020811

14

RESISTOR, FIXED

R11,

22 K

600-021131

15

RESISTOR. FIXED

470 K

-

600-021211

"1b

RESISTOR, FIXED

R13.R14

1.0 MEG

1

600-021351

17

RESISTOR. FIXED

R2

3.9 MED

600-021231

18

RESISTOR, FIXED

R8

2.2 MEG

4jQQ«OZ077 1

1

L 19

IS <-

4

001-021133

20

TRANSISTOR

01 .02.03.04

21

1

001-026030

22

DIODE

Ol

23

24

#24 GA S C SOLID WIRE

BLK

m

i — ; —

202-010004-07

25

#24 GA. S.C. SOLID WIRE

BRN

1

202-020004-07

26

#24 GA. S.C. SOLID WIRE

RED

1

202-040004-07

27

#24 GA. S.C. SOLID WIRE

TEL

3

299-220002

28

#22 GA. S.C. SOLID WIRE

BARE

}

011-041134

29

WIRE & PIN ASSEMJLf

GRA

A/R

0I5-0333OZ

30

ROSIN CCFE SOLDER

6(V40

T11

<P0UTPUT TO TERM.
"E" ON P.C. BD.
«124-000114

TO TERM. "
BOARD #124

R14

FROM TERM. #19 ON
P.C. BD.#124-0001H

T7 6

C5

390pf
R13
1 .OMEG

FROM PIN NO. 15 ON
BOARD #124-000114

R14*
1 .OMEG,

T1 ,T8

T9 in

-OTO OPEN TERMINAL 6

(BETWEEN GRN & GRA WIRES)
IN PREAMP . PERC. SWITCH
PLUG.

Cfe
82pf

n

-OTO OPEN TERMINAL IN
POWER AMPLIFIER PLUG

.00047

TO INPUT Of
AUTOMATIC RHYTHM

ASSEMBLY

R15

T1 ,T8

TO LOWER MANUAL

Rhythm »u«=»

TO POWER SUPPLY PLUG
T ERM. # 2

1 R16

(♦30VK

T12 2200

T13

TO P.C. BO. #124-000114
(TERM. #23)

063-042051 A

FIGURE 5-8.
SCHEMATIC DIAGRAM
AND PARTS LAYOUT,
PEDAL CONTROL BOARD

5-10

PEDAL DRAWBAR

POSITIONING i ROUTING OF WIRES*
CABLES FOR CLARITY ONLY

FIGURE 5-9.
WIRING DIAGRAM,
L-100 ORGAN

PEDAL SWITCH ASSEMBLY

5-11

REVERBERATION AND
VOLUME 5WITCH ASSEMBLY.

PEOAL DRAWBAR

POSITIONING ^OUTING OF WiRE5<
CA6LES FOK C ARlTY OMLY

MODEL LMOO-1 ONLY

I

THESE PLUGS CONNECT
TO PERC. 4 PREAMP
CHASSIS.

THESE. PLUGS CONNECT
TO Vl&RATQ AMP.

THIS PLUS CONNECTS TO
RLVwRfc AND POWE-R AMPLlFlLR

TOP VtEW OF CONTROL
SWITCHES SHOWiNG BOTTOM
SOW OF LUGS AND WIRING ,

MODEL L*OI CONSOLES SERIAL N0.39474 AN:D ABOVE
MOOEL LI02 CONSOLES SER.AL NO. 42527 ftNO ABOVE
MODE.. Lif ~ GOMSCwES SER al KO 43C9S AHO A»< Vfc

5-16

5-17

Figure 5-17. Parts Layout, AO-42
(1 1 7-000009) Percussion Amplifier

5-19

Figure 5-18. Parts Layout, AO-43
(1 26-00001 7) Power Amplifier

FIGURE 5-19
POWER AMPLIFIER FUSE
LOCATION (CANADIAN, 101-000130)

5-21

SECTION VI
L SERIES PARTS LIST

INDEX

CONTROL PANEL ASSEMBLY 6-3

Stop Switch Base 6-3

Manual Stop Switch Assembly 6-3

Preset Switch Assembly (Lower Manual) 6-3

Preset Switch Assembly (Upper Manual) 6-3

Percussion Switch Assembly 6-4

Vibrato Switch Assembly 6-4

Reverberation, Volume, Brilliance Switch Assembly 6-4

LOWER MANUAL ASSEMBLY 6-5

UPPER MANUAL ASSEMBLY 6-5

Playing Keys 6-5

GENERATOR & MOTOR ASSEMBLIES 6-6

PEDAL KEYBOARD & SWITCH ASSEMBLY 6-6

Terminal Panel Assembly (Long) 6-6

Terminal Panel Assembly (Short) 6-6

Key Channel Assembly (Long) 6-6

Key Channel Assembly (Short) 6-6

PREAMPLIFIER ASSEMBLY 117-000009 (AO-42) 6-7

VIBRATO AMPLIFIER ASSEMBLY 126-000023 (AO-47) 6-7

POWER AMPLIFIER ASSEMBLIES 126-000017 (AO-43) 6-9

Power Transformer Assembly 120V 60Hz 6-9

Power Transformer \ sembly 120V 50Hz 6-9

Power Transformer Assembly 234V 50-60Hz 6-9

Output Transformer Assembly 6-9

Tubes 6-9

PERCUSSION PRESET ASSEMBLY (L100A) 6 10

Power Supply Chassis 6-10

Speaker Assembly 6-10

Marked Endblock 6_10

SIX-VOICE RHYTHM ENDBLOCK

Rhythm Printed Wiring Board Assembly 6-10

Lower Right Hand Endblock Assembly 6-11

Power Supplies 6-12

Pedal Control Board Assembly 6-12

6-1

AUTOMATIC RHYTHM ASSEMBLY (RHYTHM II DRAWER)

Control Assembly
Voice Generator
Wire & Plug Assembly

WOODWORK
LI 11-1
LI 12-1
LI 22-1
LI 33-1
L143-1
L212-1
L222-1

MISCELLANEOUS

Cable Assembly (Generator To Manuals)
Reverberation Unit Assembly
Endblocks
Speakers

L-200 Parts List Index

CONTROL PANEL ASSEMBLY 120-000011

Panel Assembly

061-027350

Stop Switch Base

041-025778

823-041714

"S" Clip (For Control Panel Switch Cover)

013-024298

Line Switch

008-034791

016-034440

Lamp 6.3V

016-022885

Pilot Light Lens

016-031454

Push on Clip (For Lens)

013-031468

Felt Washer

042-020820

Aluminum Foil Tape

039-031450

Shim (For Line Switch)

033-043006

845-070318

Washer (Used on Control Panel Screws - 1 0 Used)

999-000061

Manual Stop Switch Assembly

120-000041

Mounting Block Assembly

063-025776

012-027488

Stop Slide

028-032049

Stop Channel

025-027829

Drawbar Stop

025-040198

#4-24x3/8 Round Head Screw (Drawbar Knob Mounting)

901-030514

Stamped Stop Knob 16'

031-034331

Stamped Stop Knob 8'

031-034333

Stamped Stop Knob 5-1/3'

031-034337

Stamped Stop Knob 4'

031-034338

Stamped Stop Knob 2-2/3'

031-034339

Stamped Stop Knob 2'

031-034340

Stamped Stop Knob 1-3/5'

031-034341

Stamped Stop Knob 1-1/3'

031-034342

Stamped Stop Knob 1'

031-034343

Stop Knob - Black (Early Production Only)

025-035570

Stop Knob - Ivory ( Early Production Only)

025-035571

025-035572

Clamp Spring

012-027613

Terminal Lug

007-022320

Twisted Pair & Cap Assembly (Console Output to Preamplifier)

011-036624

fl Binder Head Machine Screw (For Drawbar Stops)

846-010414

PRESET SWITCH ASSEMBLY (LOWER MANUAL) 008-024391

Switch Panel & Bracket Assembly
Cancel Lever Assembly
Mounting Bracket
Lever Mounting Bracket
Control Tab (Drawbars)
Control Tab (Ensemble)
Plastic Tie
Tubular Clip
Shaft

Spring Washer

Sems. Round Head Machine Screw
Flat Head Machine Screw

PRESET SWITCH ASSEMBLY (UPPER MANUAL) 008-024392

Switch Panel & Bracket Assembly (Drawbars, Trumpet, Clarinet)
Switch Panel & Bracket Assembly (Full Organ)
Cancel Linkage Assembly

008-024614
060-037187
035-024205
035-024335
031-036481
031-036482
013-031744
013-028002
020-037240
999-000151
821-040314
839-040214

008-024613
008-024626
060-037190

6-3

Mounting Bracket
Lever Mounting Bracket
Control Tab. (Drawbars)
Control Tab. (Trumpet)
Control Tab. (Clarinet)
Control Tab. (Full Organ)
Tubular Clip
Shaft

Spring Washer
Terminal Lug

Sems. Round Head Machine Screw

PERCUSSION SWITCH ASSEMBLY 008-024393

SWITCH PANEL & BRACKET ASSEMBLY

(SECOND HARMONIC, THIRD HARMONIC) 008-024615

SWITCH PANEL & BRACKET ASSEMBLY
(FAST DECAY, PERCUSSION SOFT) 008-024617

Mounting Bracket
Lever Mounting Bracket
Control Tab (Second Harmonic)
Control Tab (Third Harmonic)
Control Tab (Fast Decay)
Control Tab (Percussion Soft)
Spring Washer
Tubular Clip
Shaft

Terminal Lug

Flat Head Machine Screw

Sems. Round Head Machine Screw

Resistor 2.2Meg R409

Resistor 4.7fi R410,R411

VIBRATO SWITCH ASSEMBLY 008-024394

SWITCH PANEL & BRACKET ASSEMBLY (VIBRATO SMALL) 008-024616

SWITCH PANEL & BRACKET ASSEMBLY

(VIBRATO NORMAL, VIBRATO CHORUS) 008-024617

Mounting Bracket
Lever Mounting Bracket
Control Tab. (Vibrato Normal)
Control Tab. (Vibrato Small)
Control Tab. (Vibrato Chorus)
Plastic Tie
Terminal Lug
Shaft

Tubular Clip

Spring Washer

Flat Head Machine Screw

Resistor 2.2Meg R403

Resistor 3.9Meg R404

Resistor 6.8Meg R402

REVERBERATION, VOLUME, BRILLIANCE SWITCH ASSEMBLY 008-025549

Switch Panel & Bracket Assembly (Reverb II Volume Soft) 008-0246 1 7

Switch Panel & Bracket Assembly (Reverb I)

Switch Panel & Bracket Assembly (Brilliance)

Mounting Bracket

Lever Mounting Bracket

Control Tab. (REVERB I)

Control Tab. (REVERB II)

Control Tab. (VOLUME SOFT)

Control Tab. (BRILLIANCE)

Plastic Tie

Shaft

Spring Washer
Tubular Clip
Tie Strap

Flat Head Machine Screw

Sems. Round Head Machine Screw

Resistor 100K R407

Resistor 270K R406

Resistor 820K R405

Resistor 4. 7 Meg. R408

Capacitor Ceramic .0015^ C402

Capacitor .022Mf C401

Shielded Lead Assembly (Vibrato Chorus Cable - Blue Plug)

Shielded Lead Assembly (Percussion Volume Cable - Red Plug)

Shielded Cable & Cap assembly (Vibrato Switch Cable)

Shielded Cable & Cap Assembly (Reverb Switch Cable)

PERCUSSION CABLE ASSEMBLY (PERCUSSION CABLE) 011-0

CABLE ASSEMBLY (LOWER MANUAL PLUG) 011-036749
CABLE ASSEMBLY (UPPER MANUAL PLUG) 011-036750
LOWER MANUAL ASSEMBLY 119-000045

UPPER MANUAL ASSEMBLY 119-000009

Switch Cover Assembly

Top Cover Assembly

Key Comb Assembly (12 Keys)

Key Comb Assembly (8 Keys)

Key & Channel Assembly (Sharp Key)

Key & Channel Assembly (One Set of Seven Ivory)

Bracket & Channel Assembly

Sems. Bind Head Machine Screw

Sharp Key - Black

Natural Key - Ivory "C"

Natural Key - Ivory "D"

Natural Key - Ivory "E"

Natural Key - Ivory "F"

Natural Key - Ivory "G"

Natural Key - Ivory "A"

Natural Key - Ivory "B"

Natural Key - Ivory "CX" (Last Key on Manual)
Mourning Bracket Left Hand
Mounting Bracket Right Hand
Strain Relief
Screw (Key Comb)
Screw (Top Cover)
Screw (Switch Top Cover)

GENERATOR & MOTOR ASSEMBLY

Generator & Motor Assembly
Generator & Motor Assembly
Generator & Motor Assembly
Generator & Motor Assembly
Generator Assembly
Generator Assembly
Synchronous Motor
Synchronous Motor
Synchronous Motor
Synchronous Motor
Motor Capacitor
Motor Capacitor
Motor Capacitor

120V
120V
220V
220V
120V
120 V
220V

120V
120V
220V
220V

60Hz
50Hz
60Hz
50Hz
60Hz
50Hz
60H?
50Hz
60Hz
50Hz
60Hz

60Hzorl20V 50Hz
60Hzor220V 50Hz

Generator Cover Assembly
Terminal Panel Assembly (AC Panel with GY, BL. YEL.)
Motor Mounting Bracket
Capacitor Clamp
Motor Clamp
Motor Coupling Spring
Motor Coupler
Insulator Strip (AC Panel)
Post (For Mounting Cover)
Terminal Cover

Oval End Cap (Motor Capacitor)

PEDAL KEYBOARD & SWITCH ASSEMBLY 116-000010

Pedal Keyboard Frame Assembly
Cover Assembly
Cable Assembly
Actuator (13 Used)

Extension Spring (13 Used)
Stop Post (13 Used)

Up Stop Felt (26 Used)

Down Stop Felt
Terminal Lug

Pivot Bracket (8 Used)

Pivot Bracket (5 Used)

Terminal Panel Assembly (Long)
Terminal Panel

Stationary Contact Assembly (8 Used)
Contact Spring Assembly (8 Used)
Actuator Spring (8 Used)

Eyelet (24 Used)

Terminal Panel Assembly (Short)
Terminal Panel

For Other Components, Refer to Long Panel Assembly.
Key Channel Assembly (Long)
Key Channel (Long)
Long Key (Brown)
Guide Felt
Eyelet

Sems. Bind Head Machine Screw (Mounting Key)
Key Channel Assembly (Short)
Key Channel (Short)
Short Key (Black)
Guide Felt
Eyelet

Sems. Bind Head Machine Screw (Mounting Key)

PREAMPLIFIER ASSEMBLY 117-000009 (AO-42)

Chassis Pan Assembly

Chassis Housing Assembly

Matching Transformer Assembly T201

Plug Assembly 3 Pin

Plug Assembly 6 Pin (Power)

Plug Assembly 6 Pin (Percussion Switch)

Tube 12AU7

Tube 12AX7

Tube Shield

Set of Capacitors & Resistors (Chassis Mounted)

Resistor

270K

R206

Resistor

lMeg

R214

330K

R217

Potentiometer

30K

R22S

Resistor & Capacito

Panel Assembly

ernuna oar

esis or

68K

R212.R229

esu or

390S2

R211

esis or

20K

R233

esistor

2.7K

R23S

esis or

3.9Meg

R219

82S2

R209

Rector
esis or

esis or

100ft
220J2

R207
R234

' s !

IK
1.2K

R208
R231

Resistor

3.3K

R205

4.7 K

R210,R21S,R216

~~

R213

47 K

R202,R221,R232

Resistor

100K

R220.R223

R224

Resistor

180K

Selected for

220K

R226

Proper Gain

Resistor

at Inspection

Resistor

R222

Ri sistor

330K

R218

Re istor

470K

R228, R230

Resi tor

680K

R227

Resistor

lMeg

R201

Resistor
Resistor

4.7Meg
5.6Meg
120K

R203
R236

Selected at
Time of
Inspection

Capacitor

.1 mfd

200V

C21S

Capacitor

.047 mfd

400V

C204

Capacitor

.33 mfd

100V

C210

Capacitor

100 mfd

3V

C201,C205,C207

Capacitor

39 pf

500V

C203

Capacitor

.0047 mfd

100V

C211

Capacitor

.01 mfd

100V

C208,C209,C213,C214

Capacitor

.02 mfd

100 V

C212

Capacitor

.1 mfd

10V

C206

Transistor

Q201

VIBRATO AMPLIFIER ASSEMBLY 126-000023 (AO-47)

Chassis Pan Assembly
Chassis Housing Assembly

Saturable Reactor Assembly
Plug Assembly 3 Pin
Plug Assembly 6 Pin

Capacitor 30 mfd/3S0V, 40mfd/450V, 40 mfd/400V
Potentiometer 500K R131

Tube 7247
Tube 12AU7
Tube Shield

Terminal Board Assembly (Resistor & Capacitor)
Terminal Board

Resistor

SK

R123

Resistor

S6K

R136

Resistor

10K

R103, R107, Rl 13, Rl 14, Rl 18, R109

Resistor

470ft

R106,R112,R117

Resistor

560ft

R133....Use With Red Dot Reactors

Resistor

IK

R132

Resistor

1.2K

R121

Resistor

8.2K

R122

Resistor

15K

R104,R110, R115

Resistor

47 K

R119

Resistor

180K

R102

Resistor

220K

R101

Resistor

330K

R135

Resistor

470K

R130,R125,R126,R127

Resistor

lMeg

R120,R139,R10S,R111,R116

Resistor

1.8Meg

R108

Resistor

1.2K 5%

R129

Resistor

150K 5%

R128

Resistor

12K

Resistor

1SK |

One Resistor

Resistor

18K '

R137 Selected at Factory

Resistor

22K |

For Proper Phase

Resistor

27 K

Shift

Resistor

33K )

Resistor

1 .2Meg

Resistor

l.SMeg

One Resistor

Resistor

1.8Meg

Selected at Factory

Resistor

2.2Meg

) R138 For Proper Vibrato

Resistor

2.7Meg

Rate 6.6-7.0 Hz.

Resistor

3.3Meg

Resistor

3.9Meg

Resistor

270ft N

Resistor

330ft

One Resistor

Resistor

390ft ,

R133 Selected at

Resistor

470ft

Factory For Proper

Resistor

560ft j

Width Control

Capacitor

.047 mfd

100V CI 18

.02 mfd

100V CI 14, CI IS

Capacitor

.02 mfd

400V CI 13

Capacitor

.047 mfd

400V CI 08

Capacitor

.10 mfd

400V CI 16

Capacitor

.47 mfd

400V C102,C104,C106

Capacitor

150 pf

500V C120,C121,C122

Capacitor

.001 mfd

500V C101

Capacitor

.0018 mfd

500V CI 12

Capacitor

.01 mfd

500V C103,C105,C107,C119

POWER AMPLIFIER ASSEMBLIES

Power Amplifier Assembly
Power Amplifier Assembly
Power Amplifier Assembly
Chassis Pan Assembly
Power Transformer Assembly
Power Transformer Assembly
Power Transformer Assembly
Output Transformer Assembly
Filter Choke Assembly
AC Cord & Plug Assembly
AC Strain Relief
Plug Assembly
Plug Assembly
Plug Assembly

Tube 12BH7 V7
Tube 12AX7 V6,
Tube 6BQS V9,

Tube 5U4 VI 2

Set of Capacitors & Resistors (Chf

Resistor 64Q.

Resistor 4.7 K

Resistor 8.2K

120 V

60Hz

(AO-43-1)

120V

50Hz

(AO-43-2)

234V

50-60Hz

(AO-43-3)

120 V

60Hz

T-302

120V

50Hz

T-302

234V

50-60Hz

T-301

3 Pin Fei

nale (Output)

3 Pin Female (Reverb)

Resistor
Resistor
Resistor

390S2
IK

3.9K

47 K
470K

4.7Meg

220K

300fi

7 son

non

R338
R335
R341
R310,R314
R311.R312
R337

R313,R323

R301

R318

R344

R339

R340

R343

R332

Capacitor
Capacitor
Capacitor
Capacitor
Capacitor

Resistor
Resistor
Resistor

Resistor
Resistor
Resistor

56K \
82K f
120K V
270K )
lOOpf
.0022 mfd
.0012 mfd
.02 mfd
.001 mfd
50 mfd

.001 mfd

500V
500V
500V
500V
2000V
450V

C307
C315
C304
C305
C314
C303

'450V 50mfd/450V C316, C317, C318, C319
1 500V C320
:1 Assembly
R321

R333, R334
R302, R327
R322

R30S, R306
R308
R325
R315

R316, R317,R328,R329

Resistor

150K

R320

Resistor

180K

R304

Resistor

220K

R303,R319

Resistor

330K

R307,R330,R331

Resistor

470K

R324

Resistor

lMeg

R326

Capacitor

.047 mfd

400V

C311,C312

Capacitor

100 mfd

3V

C301,C308

Capacitor

220 pf

SOOV

C310

Capacitor

.02 mfd

SOOV

C302, C309

Capacitor

5 mfd

150V

C306

Capacitor

100 mfd

2SV

C313

Potentiometer

10K

R336

PERCUSSION PRESET ASSEMBLY (L-100A) 121-000105

Printed Circuit Board Chassis
Power Supply Chassis
Speaker Assembly
Marked Endblock

Knob Large (Percussion Endblock)
Knob Small (Percussion Endblock)

RHYTHM PRINTED WIRING BOARD ASSEMBLY 124-000114

Used With 6-Button Rhythm Endblock
Printed Wiring Board

Resistor

47 0f2

R138

Resistor

820f2

R103, R103A, R103B, R103C

Resistor

220052

R141, R160

Resistor

5600f2

Resistor

R108 R108A R108B R12S R131 R157 R161 R164

Resistor

12K

R148

Resistor

15K

R106A

Resistor

1SK

R119,R122

Resistor

18K

R107B

Resistor

22K

R106,R106B,R106C,R107C

Resistor

22K

R140, R128, R1S0, R151, R154, R159

Resistor

27 K

R114,R127,R142

Resistor

33K

R118.R145

39K

R107A

Resistor

47 K

R100, R100A, R100B, R100C, R137, R136, R139

Resistor

68K

R102, R102A, R102B, R102C, R165

Resistor

100K

R101, R101A, R101B, R101C, Rl 10, R117, R152, R153,
R155.R156

Resistor

150K

R121,R163

Resistor

220K

R123, R147, R149, R158, R160

Resistor

150ft

R167

Resistor

470K

R10S, R105A, R105B, R105C, Rll 1 , Rl 15, R120, R162

Resistor

680K

R124

Resistor

R112

Resistor

2.2Meg

R104, R104A, R109, R109A, R109B, R109C

Resistor

2.7Meg

R129

Resistor

6.8Meg

R104B,R168

Resistor

lOMeg

R104C

Resistor

1.5Meg

R116

Resistor

27K

R107

Potentiometer Trimmer 5K R134

Potentiometer Trimmer 50K R113,R126
Potentiometer Trimmer 20K R169

Capacitor

.001 mfd

C110,C117,C118,C119

405-340012

Capacitor

.0015 mfd

C102C,C103C,C104C

405-340022

Capacitor

.0022 mfd

C121,C125

405-340032

Capacitor

.0039 mfd

C115

405-340052

Capacitor

.0047 mfd

C102B, C103B, C104B, C128

405-340062

Capacitor

.0082 mfd

C109

405-340072

Capacitor

.01 mfd

C108,C111,C112,C116,C130

405-340082

Capacitor

.015 mfd

C102A,C103A,C104A

405-340092

Capacitor

.022 mfd

C101B,C102,C103,C104

405-340112

Capacitor

.047 mfd

C101,C101A,C127

405-340142

Capacitor

.1 mfd

C100, C100A, C100B, C100C, C108, C107, CI 14, C123,

C124.C126

405-340182

Capacitor

.22 mfd

C113

405-340212

Capacitor

.056 mfd

C101C

405-340162

Capacitor

47pf

C105B

426-010172

Capacitor

68pf

C105C

426-010212

Capacitor

220pf

C105,C105A

426-010332

Capacitor Tantalum

lmfd C120

414-040092

Capacitor '

lOmfd C122

414-040152

Capacitor ]

Electrolytic ]

lOOOmfd CI 29

407-060149

Transistor

Q106,Q107,Q108

001-021070

Transistor

Q100, Q100A, Q100B, Q100C, Q103, Q104, Ql 12, Q114, Q115, Q116

001-021134

Transistor

Q102,Q105,Q109,Q110

001-021135

Transistor

QUI, Q113

001-021172

Transistor

(Noise)

Q101

001-021211

D100, D100A, D100B, D100C, D101, D102, D103, D104

001-026010

Choke

L100,L101

003-030753

LOWER RIGHT HAND ENDBLOCK ASSEMBLY 125-000043

(Rhythm Six-Button T-200-1-2, T-400)

Endblock Lower Right Hand

025-041129

Cushion

043-041131

Push Button

025-033453

Compression Spring

012-033464

Knob

031-031755

Cable Assembly

011-041161

Cable Clip

013-025297

Potentiometer (Duel Construction)

676-000269

Resistor 2200ft

600-010571

Resistor 10K

600-010731

Resistor 56K

600-020911

Diode

001-026010

Switch Panel Assembly

008-041158

Switch Panel

006-041135

Contact Spring Assembly

008-021944

Stationary Contact Assembly

030-021927

Riveting Plate

041-020664

Contact Spring

030-041132

Pivot Bracket

041-041133

Felt Stop

042-041130

Stop Post

030-033690

012-032408

Shaft

020-037239

Spring Bridge

041-041134

Support (Shaft)

041-041157

Rocker Tab Block Pedal

031-041143

Rocker Tab Cymbal Pedal

031-041144

Rocker Tab Brush Lower

031-041145

Rocker Tab Bongo Lower
Rocker Tab Tom Tom Lower
Rocker Tab Claves Lower
Felt Washer

Retaining Ring (For Shaft)
Terminal Lug

POWER SUPPLY ASSEMBLY 120V 60Hz 127-000007
POWER SUPPLY ASSEMBLY 120V 50Hz 127-000008

POWER SUPPLY ASSEMBLY 220V 50-60Hz 127-00009

Power Supply Chassis
Terminal Strip Assembly
Transformer 120V 60Hz

Transformer 120-220V 50-60Hz

Capacitor Electrolytic 500mfd

Capacitor Electrolytic 80mfd/40mfd/20mfd CI 00
Printed Wiring Board Assembly

Printed Wiring Board & Pin Assembly

Diode D100,D101,D102,D103

Transistor Q100, Q101

Transistor Q102

Zener Diode 30V D104

Resistor 150ft R103

Resistor 220ft R101

Resistor 330ft R102

Resistor 2.2K R104

Resistor 6.8K R10S

Resistor 27K R106

Resistor 33K R108

Capacitor Ceramic .02mfd C102
Spacer (4 Used)
Cable Assembly

PEDAL CONTROL BOARD ASSEMBLY (ENDBLOCK RHYTHM)

Pedal Control Board Assembly

Terminal Bo;

jrd Assembly

Capacitor

1 mfd

CI

Capacitor

.1 mfd

C2,C3,C4

Capacitor

390 pf

cs

Capacitor

82 pf

C6

470 pf

C7

Resistor

1000ft

Rl

Resistor

2200ft

R16

Resistor

10K

R5.R10

Resistor

1SK

R12,R15

Resistor

22K

Rll

Resistor

100K

R3,R4,R7

Resistor

1S0K

R6

Resistor

470K

R7

Resistor

lMeg

R13,R14

Resistor

2.2Meg

R8

Resistor

3.9Meg

R2

Transistor

02, Q4

Transistor

Ql,Q3

Diode

Dl

AUTOMATIC RHYTHM ASSEMBLY (RHYTHM II DRAWER)

Automatic Rhythm Assembly 120V 60Hz

Power Supply Assembly
Automatic Rhythm Assembly 120V 50Hz

Power Supply Assembly
Automatic Rhythm Assembly 220V 60Hz

Power Supply Assembly
Automatic Rhythm Assembly 220V 50Hz

Power Supply Assembly

Shield (Power Supply)
Control Assembly
Voice Generator Assembly

Shield (Voice Generator Assembly)
Wire & Plug Assembly

Screw #6 (4 Power Supply-4 Voice Generator)
Screw (Mounting Rail)
Adhesive Backed Felt
Washer

Clip (Adhesive Backed)

WOODWORK

Cabinet Assembly LI 1 1-1
Case Assembly
Top Panel
Music Panel
Baffel & Grille Cloth
Rear Cover
Bench Assembly
Cabinet Assembly LI 12-1
Case Assembly
Top Panel
Music Panel
Baffel & Grille Cloth
Rear Cover
Bench Assembly
Cabinet Assembly LI 22-1
Case Assembly
Top Panel
Music Panel
Baffel & Grille Cloth
Rear Cover
Bench Assembly
Cabinet Assembly
Case Assembly
Top Panel
Music Panel
Baffel & Grille Cloth
Rear Cover
Bench Assembly
Cabinet Assembly L143-1
Case Assembly
Top Panel
Music Panel
Baffel & Grille Cloth
Rear Cover
Bench Assembly
Cabinet Assembly L212-1

LI 33-1

Case Assembly
Top Panel
Music Panel
Baffel & Grille Cloth
Rear Cover
Bench Assembly
Cabinet Assembly L222-1
Case Assembly
Top Panel
Music Panel
Baffel & Grille Cloth
Rear Cover
Bench Assembly

MISCELLANEOUS

Pedal Filter Choke Assembly

Cable Assembly (Generator To Manuals)

Reverberation Unit Assembly

Trim Strip (Grille Cloth)

Speed Nut

Cover (Control Switch)
Felt (Adhesive Backed)
Endblock Upper Right Hand - Textured
Endblock Upper Right Hand - Smooth
Endblock Lower Left Hand - Textured
Endblock Lower Left Hand - Smooth
Endblock Lower Right Hand - Textured
Endblock Lower Right Hand - Smooth

SPEAKERS

L100, L100-1 ,-2 (Early Production)

L100A (Early Production)

L100,L100-l,-2

L100A

L200 PARTS LIST

INDEX

CONTROL PANEL ASSEMBLY 6 16

Stop Switch Base 6-16

Manual Stop Switch Assembly 6-16

Preset Switch Assembly (lower manual) 6-16

Preset Switch Assembly (upper manual) 6—16

Percussion Switch Assembly 6—17

Vibrato Switch Assembly 6-17

Reverberation, Volume, Brilliance Switch Assembly 6-17

LOWER MANUAL ASSEMBLY 6-18

UPPER MANUAL ASSEMBLY 6-18

Playing Keys 6-18

GENERATOR AND MOTOR ASSEMBLY 6-19

PEDAL KEYBOARD AND SWITCH ASSEMBLY 6-19

Terminal Panel Assembly (long) 6-19

Terminal Panel Assembly (short) 6-19

PREAMPLIFIER ASSEMBLY 117-000009 6-20

VIBRATO AMPLIFIER 126-000023 6-20

POWER AMPLIFIER ASSEMBLIES 6-22

Power Transformer 120 V 60 Hz 6-22

Power Transformer 120 V 50 Hz 6-22

Power Transformer 234 V 50-60 Hz 6-22

SWELL PEDAL ASSEMBLY 123-000021 6-23

RHYTHM II AND EXTRUSION ASSEMBLY 125-000050 6-23

POWER SUPPLY ASSEMBLY 126-000041 6-23

Transformer Assembly 120 V 60 Hz 6-23

Transformer Assembly 120/220 V 50/60 Hz 6-23

MISCELLANEOUS

Generator Pad 6-24

Reverberation Unit Assembly 6—24

Power Supply Cable 6-24

Speakers 6—24

Swell Pedal Housing 6-24

End Blocks 6-24

Front Strip 6-24

Pedal Filter Choke Assembly 6-24

WOODWORK 6-24

L-212 6-24

L-222 6-25

L-295 6-25

CONTROL PANEL ASSEMBLY 120 000011

Panel Assembly
Stop Switch Base

Screw (Stop Switch Base Mounting)

"S" Clip (For Control Panel Switch Cover)

Line Switch

Lampholder Assembly

Lamp 6.3V

Pilot Light Lens

Push on Clip (For Lens)

Felt Washer

Aluminum Foil Tape

Shim (For Line Switch)

Screw (Control Panel Mounting - 10 Used)

Washer (Used on Control Panel Screws - 10 Used)

Manual Stop Switch Assembly

Mounting Block Assembly

Contact Spring Assembly

Stop Slide

Stop Channel

Drawbar Stop

#4-24x3/8 Round Head Screw (Drawbar Knob Mounting)

Stamped Stop Knob 16'

Stamped Stop Knob 8'

Stamped Stop Knob 5-1/3'

Stamped Stop Knob 4'

Stamped Stop Knob 2-2/3'

Stamped Stop Knob 2'

Stamped Stop Knob 1-3/5'

Stamped Stop Knob 1-1/3'

Stamped Stop Knob 1 '

Clamp Spring

Terminal Lug

Twisted Pair & Cap Assembly (Console Output to Preamplifier)
#2-56 Tap Tite Screw

PRESET SWITCH ASSEMBLY (LOWER MANUAL) 008-034391

Switch Panel & Bracket Assembly
Cancel Lever Assembly
Mounting Bracket
Lever Mounting Bracket
Control Tab (Drawbars)
Control Tab (Ensemble)
Plastic Tie
Tubular Clip
Shaft

Spring Washer

Sems. Round Head Machine Screw
Flat Head Machine Screw

PRESET SWITCH ASSEMBLY (UPPER MANUAL) 008-024392

Switch Panel & Bracket Assembly (Drawbars, Trumpet, Clarinet)
Switch Panel & Bracket Assembly (Full Organ)
Cancel Linkage Assembly

Mounting Bracket
Lever Mounting Bracket
Control Tab. (Drawbars)
Control Tab. (Trumpet)
Control Tab. (Clarinet)
Control Tab. (Full Organ)
Tubular Clip
Shaft

Spring Washer
Terminal Lug

Sems. Round Head Machine Screw

PERCUSSION SWITCH ASSEMBLY 008 024393

SWITCH PANEL & BRACKET ASSEMBLY

(SECOND HARMONIC, THIRD HARMONIC) 008 024615

SWITCH PANEL & BRACKET ASSEMBLY
(FAST DECAY, PERCUSSION SOFT) 008-024617

Mounting Bracket
Lever Mounting Bracket
Control Tab (Second Harmonic)
Control Tab (Third Harmonic)
Control Tab (Fast Decay)
Control Tab (Percussion Soft)
Spring Washer
Tubular Clip
Shaft

Terminal Lug

Flat Head Machine Screw

Sems. Round Head Machine Screw

Resistor 2.2 Meg R409

Resistor 4.7ft R410,R411

VIBRATO SWITCH ASSEMBLY 008-024394

SWITCH PANEL & BRACKET ASSEMBLY (VIBRATO SMALL) 008-024616

SWITCH PANEL & BRACKET ASSEMBLY

(VIBRATO NORMAL, VIBRATO CHORUS) 008-024617

Mounting Bracket
Lever Mounting Bracket
Control Tab. (Vibrato Normal)
Control Tab. (Vibrato Small)
Control Tab. (Vibrato Chorus)
Plastic Tie
Terminal Lug
Shaft

Tubular Clip

Spring Washer

Flat Head Machine Screw

Resistor 2.2Meg R403

Resistor 3.9Meg R404

Resistor 6.8Meg R402

REVERBERATION, VOLUME, BRILLIANCE SWITCH ASSEMBLY 008-025549

Switch Panel & Bracket Assembly (Reverb II Volume Soft)

Lever Mounting Bracket
Control Tab. (REVERB I)
Control Tab. (REVERB II)
Control Tab. (VOLUME SOFT)
Control Tab. (BRILLIANCE)
Plastic Tie
Shaft

Spring Washer
Tubular Clip
Tie Strap

Flat Head Machine Screw

Sems. Round Head Machine Screw

Resistor 100K R407

Resistor 270K R406

Resistor 820K R40S

Resistor 4.7Meg. R408

Capacitor Ceramic .0015^/ C402

Capacitor .022m/ C401

Shielded Lead Assembly (Vibrato Chorus Cable - Blue Plug)

Shielded Lead Assembly (Percussion Volume Cable - Red Plug)

Shielded Cable & Cap assembly (Vibrato Switch Cable)

Shielded Cable & Cap Assembly (Reverb Switch Cable)

PERCUSSION CABLE ASSEMBLY (PERCUSSION CABLE) 011 036640

CABLE ASSEMBLY (LOWER MANUAL PLUG) 011-036749

CABLE ASSEMBLY (UPPER MANUAL PLUG) 011-036750

LOWER MANUAL ASSEMBLY 119-000045

UPPER MANUAL ASSEMBLY 1 19-000009

Switch Cover Assembly

Top Cover Assembly

Key Comb Assembly (12 Keys)

Key Comb Assembly (8 Keys)

Key & Channel Assembly (Sharp Key)

Key & Channel Assembly (One Set of Seven Ivory)

Bracket & Channel Assembly

Sems. Bind Head Machine Screw

Sharp Key - Black

Natural Key - Ivory "C"

Natural Key - Ivory "D"

Natural Key - Ivory "E"

Natural Key - Ivory "F"

Natural Key - Ivory "G"

Natural Key - Ivory "A"

Natural Key - Ivory "B"

Natural Key - Ivory "CX" (Last Key on Manual)
Mounting Bracket Left Hand
Mounting Bracket Right Hand
Strain Relief
Screw (Key Comb)
Screw (Top Cover)
Screw (Switch Top Cover)

GENERATOR & MOTOR ASSEMBLY

enerator o or ssem y

1 20V 60Hz

112-000021

enera or o or ssem y

1 20V 50Hz

1 1 2-000022

1 1 2-000023

enerator ssem y
enera or o or ssem y

220V 50Hz

112-000024

113-000011

Generator Assembly

Z

1 13-000012

Sj nchronous Motor

Z

021-033801

Synchronous otor

Z

021-033802

ync ronous otor

021-033803

Sync ronous otor

220V 50Hz

021-033804

otor apaci or

120V 60Hz

499-033806

o or apaci or

120V 60Hz or 120V 50Hz

499-033807

220V 60Hz or 220V 50Hz

499-033805

Gener^ator'cover Assembl

1 1 5-000003

Terminal Panel Assembl (AC Pan

»1 with GY, BL. YEL.)

006-024326

Mo^Hvlountin Bracket
o or oun ing rac e

apaci or amp

013-024313

013-024427

012-029132

Motor CoTl'" 8 Pn " 8
o or 0 "P er

017-024242

036-024328

Post (For Mounting Cover)

044-031434

Terminal Cover

041-022076

Oval End Cap (Motor Capacitor)

041-024838

PEDAL KEYBOARD & SWITCH ASSEMBLY 116 000010

Pedal Keyboard Frame Assembly

060-024270

Cover Assembly

046-025208

Cable Assembly

01 1-024210

Actuator (13 Used)

045-024198

Extension Spring (13 Used)

012-020404

Stop Post (13 Used)

044-020398

Up Stop Felt (26 Used)

042-0204 1 0

Down Stop Felt

042-031898

Terminal Lug

007-015197

Pivot Bracket (8 Used)

035-036094

Pivot Bracket (5 Used)

035-036095

Terminal Panel Assembly (Long)

063-036553

Terminal Panel

045-024196

Stationary Contact Assembly (8 Used)

030-033305

Contact Spring Assembly (

i Used)

012-033541

Actuator Spring (

1 Used)

012-024199

Eyelet (24 Used)

999-026552

Terminal Panel Assembly (Short)

063-036554

Terminal Panel

006-024197

For Other Components, Refer to Long Panel Assembly.
Key Channel Assembly (Long)
Key Channel (Long)
Long Key (Brown)
Guide Felt
Eyelet

Sems. Bind Head Machine Screw (Mounting Key)
Key Channel Assembly (Short)
Key Channel (Short)
Short Key (Black)
Guide Felt
Eyelet

Sems. Bind Head Machine Screw (Mounting Key)

PREAMPLIFIER ASSEMBLY 117-000009 (AO-42)

Chassis Pan Assembly

Chassis Housing Assembly

Matching Transformer Assembly T201

Plug Assembly 3 Pin

Plug Assembly 6 Pin (Power)

Plug Assembly 6 Pin (percussion Switch)

Tube 12AU7

Tube 12AX7

Tube Shield

et of Capacitors &

Resistors (Cha

ssis Mou.

ited)

Resistor

270K

R206

Resistor

R214

Resistor

330K

R217

Potentiometer

30K

R22S

esistc r &. Ca t

ir Panel \ssembly

Terminal Board

Resistor

R212.R229

Resistor

R211

Resistor

R233

R235

Resistor

3.9Meg

R219

Ri sistor

82S2

R209

Resistor

R207

Resistor

220J2

R234

R208

Ri i tor

1.2K

R231

Resistor

3.3K

R20S

Resistor

4.7K

R210,R21S,R216

R( ' tor

1SK

R213

Resist™

47 K

R202,R221,R232

100K

R220.R223

R224

R< ' tor

180K

Selected for

esis or

R226

Proper Gain

270K

at Inspection

Ri ' tor

270K

R222

Ri ! tor

330K

R218

Resistor

470K

R228, R230

680K

R227

Rf istor

lMeg

R201

Selected at

Resistor

4.7Meg

R203

Time of

Resistor

S.6Meg

Resistor

120K

R236

Inspection

Capacitor

.1 mfd

200V

C215

.047 mfd

400V

C204

.33 mfd

100V

C210

100 mfd

3V

C201,C205,C207

39 pf

500V

C203

.0047 mfd

100V

C211

.01 mfd

100 V

C208,C209,C213,C214

.02 mfd

100V

C212

Capacitor

.1 mfd

10V

C206

Transistor Q201

VIBRATO AMPLIFIER ASSEMBLY 1 26-000023 (AO-47)

Chassis Pan Assembly
Chassis Housing Assembh

Saturable Reactor Assembly

Plug Assembly 3 Pin

Plug Assembly 6 Pin

Capacitor 30 mfd/350V, 40 mfd/450V,

Potentiometer 500K R131

40mfd/400V C109, CI 10, CI 1 1

7247

mbly (Resistor & Capacitor)

47K

180K

220K

330K

470K

lMeg
1.8Meg
1.2K 5%

1S0KS%
12K \
15K /

27K \

33K )
1.2Meg,
1.5Meg ]
1.8Meg (
2.2Meg \
2.7Meg (
3.3Meg \
3.9Meg J
27012 )
330S2 /
390£2
47012 [
S60S2 '
.047 mfd
.02 mfd
.02 mfd
.047 mfd
.10 mfd
.47 mfd
ISO pf
.001 mfd
.0018 mfd
.01 mfd

R123
R136

R103, R107, Rl 13, R114, Rl 18, R109

R106,R112,R117

R133....Use With Red Dot Reactors

R132

R121

R122

R104,R110,R11S

R119

R102

R101

R135

R130,R125,R126,R127

R120,R139,R105,R111,R116

R108

One Resistor
Selected at Factory
For Proper Phase
Shift

One Resistor
Selected at Factory
For Proper Vibrato
Rate 6.6-7.0 Hz.

One Resistor

Factory For Proper
Width Control
C118

C114,C115
C113
C108
C116

C102,C104,C106

C120,C121,C122

C101

C112

C103,C105,C107,C119

POWER AMPLIFIER ASSEMBLIES

Power Amplifier Assembly

120V

60Hz

(AO-43-1)

126-000017

Power Amplifier As

sembly

120V

50Hz

126-000018

Power Amplifier Assembly

234V

50 60Hz

(AO 43 3)

126-000019

Chassis Pan Assembly

009-024410

Power Transformer

Assembly

120V

60Hz

T302

003-024157

Power Transformer Assembly

120V

50Hz

T 302

003-036548

Power Transformer Assembly

234V

50 60 Hz

z

T 302

003-036549

Output Transformer Assembly

T 301

003-036550

Filter Choke Assembly

14 Hen

en

CH 301

003-0241 59

AC Cord & Plug Assembly

011-033233

AC Strain Relief

013-034998

Plug Assembly

3 Pin Female (Output)

011-036628

Plug Assembly

9 Pin

011-024379

Plug Assembly

3 Pin Female (Reverb)

01 1-036633

Tube 12BH7

V7

002-012302

Tube 12AX7

V6, V8

002-012301

Tube 6BQ5

V9.V10

002-006700

Tube SU4

V12

002-005201

Set of Capacitors & Resistors (Chassis Moui

.ted)

063-024401

Resistor

64f2

R338

604-070071

Resistor

4.7K

R335

600-030651

Resistor

8.2K

R341

600-03071 1

Resistor

390S2

R310.R314

600-020391

Resistor

IK

R311,R312

600-020491

Resistor

3.9K

R337

600-020631

Resistor

47K

R313,R323

600-020891

Resistor

470K

R301

Resistor

4.7Meg R318

600 021371

Resistor

220K

R344

600-021051

Resistor

300S2

R339

602-050081

Resistor

750ft

R340

602-050121

Resistor

IK

R343

Resistor

130ft

R332

606-050022

Resistor

33K N

600-020851

Resistor

39K j

Factory Selected

600-020871

Resistor

S6K 1

R309

For Nominal Gain

600-020911

82K |

600-020951

Resistor

120K 1

600-020991

Resistor

270K ,

600-021071

Capacitor

lOOpf

500V

C307

425-010252

Capacitor

.0022 mfd S00V

C315

425-010583

Capacitor

.0012 mfd 500V

C304

Capacitor

.02 mfd 500V

C305

425 010763

.001 mfd 2000V

C314

425 030503

50 mfd 450V

C303

450-010070

50 mfd/450V 50 mfd/450V

C316,C317,C318,C319

450-040401

Capacitor

.001 mfd 500V

C320

425-010502

Resistor & Capacitc

>r Panel Assembly

063-02441 1

Resistor

150ft

R321

600-020291

Resistor

IK

R333, R334

600-020491

Resistor

2.7K

R302, R327

600-02059 1

Resistor

6.8K

R322

600-020691

Resistor

10K

R30S.R306

600-020731

Resistor

39K

R308

600-020871

Resistor

47K

R325

600-020891

Resistor

68K

R315

600-020931

Resistor

100K

R316,R317,R328,R329

600-020971

Resistor

150K

R320

Resistor

180K

R304

Resistor

220K

R303, 319

Resistor

330K

R307, 330, 331

Resistor

470K

R324

Resistor

lMeg

R326

Capacitor

.047 mfd

400V

C311.312

Capacitor

100 mfd

3V

C301 , 308

Capacitor

220 pf

500V

C310

Capacitor

.02 mfd

500V

C302, 309

Capacitor

5 mfd

150V

C306

Capacitor

100 mfd

25V

C313

Potentiometer

10K

R336

SWELL PEDAL ASSEMBLY 123-000021

Base Bracket Assembly
Shutter Assembly
Bearing Bracket
Bearing Bracket with Dowel
Pedal Bearing (slotted)

Square Nut

Cell & Housing Wiring Assembly
Diffuser

Photo Cell Housing Cover
Light Bulb Socket Assy.
Spring
Light Bulb

Pedal Assembly (with mat)

RHYTHM II & EXTRUSION ASSEMBLY 125-000050

Rhythm II Unit (inbuilt Automatic)
Screened Panel (painted Part)
R. H. End Cap
L.H.End Cap

POWER SUPPLY ASSEMBLY 120V

POWER SUPPLY ASSEMBLY

POWER SUPPLY ASSEMBLY

Power Supply Chassis
Terminal Strip Assembly
Transformer
Transformer
Capacitor, Electrolytic

Resistor
Resistor

120V
220V

120V
120/220V
500 mfd/40V

50/60 Hz.
50/60 Hz.

MISCELLANEOUS

Generator Pad
Speed Clip

Reverberation Unit Assembly
Power Supply Cable

Terminal Panel Assy, (between Reverb & Amp)

Cable & Cap Assy. (Speaker to Amp)

Cable & Contact Assy, (between Speakers)

Shielded Lead & Plug Assy, (between Preamp & Vib. Amp)

Shielded Lead & Plug Assy, (between Preamp & Vib. Amp)

Shielded Lead & Plug Assy. (Red Reverb Cable)

Shielded Lead & Plug Assy, (gray Reverb Cable)

Shield (Rhythm II Power Supply)

Speaker 12" (R.H. Viewed from Rear)

Speaker 12" (L. H. Viewed from Rear)

Cable & Plug Assy. (BLK plug cable at Amp)

Terminal Cover (lower manual)

Grommet (lower manual)

Swell Pedal Housing Assembly

Amplifier Base

End Block - Lower L.H.

End Block Bracket

End Block - Lower R. H.

Terminal Strip Assembly (Shelf)

Generator Tee-Nut

Generator Grommet

Generator Washer

Generator Mounting Screw

Plastic Ties

Oil Tube Assembly

Trim Strip (Swell Pedal)

Front Strip (manual)

Cable Clip

Pedal Filter Choke Assembly
WOODWORK

Cabinet Assembly L-212
Case Assembly

Brad

Fastener "Clip" (Rear Cover)

Baffle & Grille Cloth

Lock Nut (Speaker & Baffle Mounting)

Baffle (only)

Grille Cloth

Standard Mounting Screw
Plastic Bumper
Top & Music Panel Assembly
Top Panel
Music Panel
Hinge

Top Rail Screw
Stud (Top Panel)

Cabinet Assembly L-222
Case Assembly
Rear Cover
Fastener (Rear Cover)
Brad

Fastener "Clip" (Rear Cover)

Baffle & Grille Cloth

Lock Nut (Speaker & Baffle Mounting)

Baffle (only)

Grille Cloth

Standard Mounting Screw

Plastic Bumper

Top & Music Panel Assembly

Top Panel

Music Panel

Hinge

Screw

Top Rail Screw
Stud (Top Panel)
Bench Assembly

Cabinet Assembly L-29S

Rear Cover

Fastener "Clip" (Rear Cover)
Baffle & Grille Cloth
Lock Nut
Baffle (only)
Grille Cloth

Standard Mounting Screw
Plastic Bumper

Top Panel
Music Panel
Bench Assembly

NOTES

HO-735 1M-5/75 DIV. Printed U.S.A.

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