Hammond M100Mm2m3SvcMan User Manual

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INGLUDINe

PARTS LIST

CAUTION

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INSIDE

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H000-006059

ORGAN

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COMPANY

SAFETY NOTICE

Great care has bean

shock

technician

hazard

to

exists on

hazardous

exposed metal parts

taken

any exposed

during repair

on these products should

In the

line

oniy

voltages and

be performed by those who are thoroughly

design

metal parts.

or

reassembly of

and manufacture of this

Internal service

accidentally

product components.

cause

precautions necessary when working on this type of equipment.

To protect

their

the owner aftor

original

the user, It Is required that all enclosure parts

condition

any

service operation.

and the

following

tests be performed before

and safety Interlocks

product

to

operations can

these voltages

To prevent this,

familiar

returning the product

assure that

expose

to appear

work

with

be

rettored

no

the

on

the

to to

Plug the

AC iine cord

directiy Into

a

line

voltage AC receptacle

(do not use an

transformer for this test) and turn the product on. Connect the network

senes with all exposed metal parts and a Known earth ground such

Use

the network. Move the

heads,

network. Reverse

an AC VOM of

knobs and control

5,000

the

line plug and repeat

more is excessive and indicates a potential shock

returning

the

product

to the

ohms per volt or higher

network connection

shafts,

user.

escutcheon,

to each exposed metal part

the measurements. Any reading of 4 volts

sensitivity

etc.) and measure the voltage drop across

measure the

to

hazard which must be

as

a water

Isolation

(as shown below)

pipe or

voltage drop

(metal chassis, screw

conduit.

across

In

the

RMS or

corrected

before

n

VOM

AC SCALE

OK

I

TEST

PROBE

I I

.01

CERAMIC

BYPASS CAP

TEST CLIPS

Mf

RF

TO

EXPOSED

HETAL

PARTS

CONNECTEQ

EARTK ORQUHO

TO

WQWN

A

TABLE OF CONTENTS

GENERAL

DESCRIPTION

INSTALLATION AND MAINTENANCE

MUSICAL TERMS

NOTES AND OCTAVES

HABMONICS OR

BOW

THE ORGAN WORKS

OVERTONES

PAGE

ONE KEY

DOES NOT PLAY

ONE NOTE IS WEAX

PERCUSSION NOTES

PEDAL NOTE SOUNDS

PEDAL NOTE SOUNDS FAINTLY

VEAK

AT FULL VOLUME

HUM

PAGE

19

20

2I

21

CONSTRUCTION AND OPERATION OF COMPONENTS

MOTORS AND POWER SWITCHES 7

TONE GENERATOR

MANUALS 8

HARMONIC DRAWBARS

9

PEDAL DRAWBAR 9

PEDAL KEYBOAIU)

9

7

PROCEDURE

REPLACING

FOR REMOVING PARTS

TUBES

UPPER MANUAL KEY

LOWER MANUAL KEY

DRAWBAR CONTACT SPRING

DRAWBAR

OR DRAWBAR KNOB

UPPER MANUAL

22

23

24

EXPRESSION

PEDAL

10

CONTROL TABLETS 10

PERCUSSION CONTROL TABS 10

VIBRATO TABS

+

PRESET TABS

11

12

REVERBERATION-VOLUME SOFT TABS ,,.12

AMPLIFIER

ASSEMBLY

12

LOWER MANUAL

CONTROL

PERCUSSION

PANEL ACCESS

SWITCH ACCESS

GENERATOR

STARTING MOTOR

PILOT LIGHT

TAB SWITCH

25

26

26A

MANUAL SECTION OF AMPLIFIER

PEDAL SECTION OF AMPLIFIER

INTERMEDIATE SECTION OF AMPLIFIER

OUTPUT SECTION OF AMPLIFIER

PERCUSSION SECTION OF AMPLIFIER

POWER SUPPLY

TUBE SOCKET VOLTAGES

,.,.

13

I

15

16

17

H

VIBRATO LINE

PEDAL

EXPRESSION PEDAL

PRESET

SELECTOR

HARMONIC BUSBAR SWITCHING & REIT-

UPPER MANUAL

BOX

KEYBOARD

PERCUSSION UNIT

SWITCH

26A

77

78

SPLIT 78

78

REVERBERATION AMPLIFIER

17

SPECIAL EQUIPMENT 18

RADIO, PHONOGRAPH,

EXTENSION SPEAKER

OR

MICROPHONE 18

18

EAR PHONES IS

SPECIAL POV,^R SOURCES

PRACTICAL

SERVICE SUGGESTIONS

19

MODE SWITCH

FREQUENCY

CYMBAL

BRUSH KEi'ING 80

CYMBAL KEYING 80

.

AND BRUSH 80

CXMBAL-BRUSH AMPLIFIER

CH.\NnES

DIVIDER 79

AND

NOISE

GATE

AM REVISIONS

79

80

81

ORGAN DOES

NOT

PLAY 19

1

IiKTALLr\TION

AND MAINTENANCE

BACK

COVER

.

FIGURE

1

2. Front View of Console

LIST OF FIGURES AND

Front View of Console

-

Model M

-

Model M-2

ILLUSTRATIONS

PAGE

27

28

3. Back View of Console

4. Front View of Console

5. Back View of Console

6. Front View of Console

7.

Back View of

Console

-

Model M, M-2

-

Model M-3 30

-

Model

-

Model M-lOO

-

Model M-lOO

M-3

29

31

32

33

8. Block Diagram

9

10.

11. Block Diagram

12.

,

Block Diagram

Typical

Tone

-

Model M

-

Model

-

Mcdel M-3

-

Model M-lOO

Generator

M-2

."

34

35

36

13. Magnet Locations on Tone

14

14A. Generator Cover

15. Generator Cover

16

Generator Cover

-

Model M

-

Model M

-

Model

-

Model M-3

Generator

-

M, M-2,

Serial

-

90485 and

. , , . 36

37

15083 and Up

37

M-3 38

above

39

17. Generator Cover

18. Manual Wiring Chart

19. Drawbar Assembly

20. Pedal Keyboard

21. Pedal Keyboard Assembly

-

Model M-lOO

Assembly

-

M, M-2, M-3

-

M-lOO

40

41

42

43

22.

23. Vibrato

24.

25.

Fundamental

Vibrato System

Fundamental

Vibrato System

System

Vibrato System

-

Model M

-

Model M

-

M

13509 and below

13509 and above

-

M-2, M-3

43

44

45

LIST

OF FIGURES AND ILLUSTRATIONS

CONTINUED

FIGURE

26.

27. Vibrato Line

28.

29. Vibrato Line

Fundamental Vibrato

Vibrato Line Box

System

-

Box-Model M, M-2

-

M-3

Box

-

M-lOO

PAGE

46

47

30.

31. Vibrato System

32. Vibrato System M-2

33.

34. Pictorial

Vibrato Scanner

M-2

Manual Hold Down Screws (M, M-2, M-3)

-

Model M Amplifier

-

Serial 19000 to 22253

Serial 25254 and

above

47

48

49

50

35.

36.

36A.

36B.

37.

Pictorial

-

Model M Amp.

-

Model M-2 Amp. Serial 19000 and above

-

Model

-

Model

M-3 Amp (Partial)

M-3 Amp

-

Serial 8411 and above

Schematic AO-35 Reverberation Amp M-lOO

51

52

53

54

55

38. Schematic AO-44

38A. Schematic AO-44

39.

40.

41. Wiring

Schematic AO-66 Reverberation Amp

Schematic Model M

Diagram Model M

Reverberation Amp M-lOO

-

See Serial

Numbers

(Later Model M-lOO)

56

57

58

59

60

41A.

42.

43.

43A. Wiring

44. Schematic Model M-3

Wiring Diagram Model M

Schematic Model M-2

Wiring Diagram Model

Diagram Model M-2

-

M-2

-

Serial 15083 and

19000 and above

-

Serial

19000

Serial 25254 and above 64

above 61

and above

62

63

65

F

44A. Schematic Model M-3 Serial 90485 and

44B. Schematic

45.

Wiring

Diagram Model M-3

Model

M-3

-

Serial 109466 and

above

66

67

68

.

FIGURE

LIST

OF FIGURES AND

ILLUSTRATIONS CONTINUED

PAGE

45A. Wiring Diagrams Model M-3

46. Schematic Model M-lOO with AO-35 and AO-29

47- Schematic Model M-lOO with AO-44

48. Schematic Model

49.

Wiring

Diagram

M-lOO with AO-66

M-lOO with AO-35 Amp

-

Serial 90485

and AO-29

and AO-67

and above

69

70

71

72

73

50

51. Wiring Diagram M-lOO Control Panel

Wiring Diagram M-lOO with AO-44 Amp

,

i

M-IOOA SUPPLEMENT

52. M-IOOA

53. Brush and Cymbal Wiring Diagram with AO-66 Amp

Percussion

Kit Wiring Diagram

74

73

82

83

54. Brush and Cymbal Wiring Diagram with

55.

56. Schematic

57

58. Percussion Kit Circuit Board Component Layout

Schematic

Wiring

Diagram Model

-

Percussion Preset

Diagram Model

M-IOOA

Unit

M-IOOA

AO-44

Amp

°^

85

87

88

89

4

.

The

quiring

(44)

pression

by

colors

the music are adjusted

push button

Hammond Organ

no external tone cabinet.

keys

each, a 12 (M, M-2, M-3)

(or swell) pedal for controlling the volume. All

"m"

electro-magnetic tone generators and electrically

is

made

and a toggle switch or two toggle switches

by

adjusting

GENERAL

Series Spinet

DESCRIPTION

Consoles

All Models have two

or 13 (M-lOO)

are

completely

(2)

note pedal keyboard,

amplified.

eighteen(18) drawbars, and

other characteristics

by means of tilting control tablets

located in the front of

self

contained,

manuals

tones

are produced

Selection of

and

tab

re-

of forty-four

and

an ex-

tone

of

switches.

A

the

Figures

rear views

optional

Console are used to turn on the organ.

1 thru 7 show the front and rear views of the "M" Series

are shown with the dust covers removed.

accessory and are not shown.

A card packed with

formation

on installing the organ, oiling, and packing for moving

Console rear panels are

INSTALLATION AND MAINTENANCE

the playing instructions or located in

Models- The

an

the bench gives full in-

or shipment.

(See

Back

Cover)

MUSICAL TERMS

The service man

mation helpful in

NOTES

Keyboard

spven

in a definite sequence. Black keys

AND OCTAVES

instruments

(7)

''naturals" (white keys) and five

who has had no musical

studying

are

the

operation

divided

into '^octaves" of 12 keys

training will find the following infor-

of the

(5)

occur in groups of

organ.

"sharps" or "flats" (black keys)

or notes, each with

two and three in each

octave and offer

cally there

has a frequency

Each note has

next higher

is no

1.059 times the frequency of

a frequency exactly one half that of the corresponding

octave. Each white key is called

letters are known

"sharp"of

the

notes

black key between

a convenient way to identify

difference

as "note of the musical scale", A black

below it

C and

D

may properly be called Cif (Sharp)

between

or a

'^flat" of the notes

a black

the notes of the octave. Techni-

key

the

by a

and a white one, since each key

letter

above it;

note in the

for A to G and these

key may

for instance,

or

D*^

be

(D flat).

called a

the

HARMONICS OR OVERTONES

Any

"tone quality"

which includes

or "overtones,"

Such a combination

frequency.

identifies the

or fundamental

musical note has a definite fundamental pitch or frequency and also a certain

or

not only a fundamental frequency but also

each of which is

"timbre"

is more pleasing musically than

The ear does

note as a complex tone

depending on its wave shape. A complex note is one

one or more "harmonics"

an integral multiple of the fundamental frequency.

note

a

having only a

not distinguish the harmonics independently , but instead

having the pitch of the lowest component,

single

.

Most tone

Hammond

can be

tone producing mechanism, however, generates individual frequencies which

combined by means of harmonic drawbars to produce any desired tone quality.

The block

ments.

HOW THE ORGAN WORKS

sources, such as strings, reeds , or pipes, produce complex tones . The

diagrams in

Figures

8 thru 11 show the chief components of the instru-

Electrical

impulses of various frequencies are produced

in the "tone

generator'^

which motor

contains a number of "tone wheels"

and gear

with high and

rotates

in

the magnetic field

small

its

second.

A note

pitch

voltage, when

these teeth

or

played

driven

at predetermined

arrangement. Each tone wheel is a steel disc

low spots, or teeth, on its edge (see figure

pass near a permanent magnet, and

suitably filtered,

frequency

on

either manual

induce a voltage in

a coil wound

produces one note of

depending on the number

of the organ

of teeth passing

consists of a fundamental

the resulring

on the magnet. This

speeds by

similar to

12). As

a gear^

the wheel

a

variations

the musical scale,

the magnet each

pitch and

a number

al and

of drawbars.

tone colors at will. The

al

pre-selected tones

Mixed

eight harmonics

tones from the manuals

mechanism,

of harmonics, or multiples

available on each

By suitable

available,

the expression

of the fundamental frequency.

playing key are controllable

adjustment of these controls

M-lOO Console

MODEL

are amplified and then

control, and additional stages of amplification

has several preset tabs

M

pass through the vibrato

the player may

which make sever-

The

fundament

by means

vary the

before

reaching

Mixed

tones from either the upper

"vibrato"

corresponding

called "Solo"

the loudspeaker -

channel or the "No Vibrato"

vibrato selector of "Vibrato Cancel"

on the selector tab of

best suited for combined

and passed through

MODEL M-2i

playing melody

the expression control

M-3i M-lOO

or the lower

channel, depending

the M-2 and M-3 to

or solo parts of

manual may go through either the

tabs.

on the position of

(The upper manual is

the

indicate that it is

the music.) The tones are then

and additional stages of

amplification

before

Percussion tones

harmonic drawbar,

of

the signal

to the same drawbar, and conducting the balance of

through push-pull

The percussion

the

vibrato system but before

signal is

reaching the speaker(s)-

MODEL M-3» M-lOO

are produced by borrowing a signal from the

3rd harmonic drawbar, or

both,

control tubes where its decay

then

combined

the expression control. The control tubes are

with the signal from the manuals after

amplifying

characteristics are controlled.

upper manual 2nd

it, returning part

the signal

keyed through the

The

are produced

tones

controlled.

to that of the manuals,

from

vibrato

pedal tones do

as complex tones

go to a pedal amplifier,

The single

the manual

before passing through the expression

system.

6th harmonic key contacts and bus bar.

not

require

drawbars for tone color variation, because

by

special

tone wheels.

where the attack and decay characteristics are

pedal drawbar adjusts

and the pedal signal

the

than

they

From

the pedals these

volume of the pedals relative

is

combined with the signal

control, but after the

,

CONSTRUCTION AND

In reviewing this section

systems

in the back

of this manual. Connections between

the wiring diagrams and control

manual,

refer to the schematic circuits of

MOTORS AND POWER SWITCHES

The

tone

driven at constant speed by a

generator

assembly in

synchronous

OPERATION OF

assembly

wiring drawings,

which all tones

motor, located at the left

COMPONENTS

the entire

components are

also in the back

of the organ originate,

organ shown

of the

is

side as

in

you

look in at the back of the Console. Attached

the synchronous motor is not self-starting, it must be brought

a starting motor at the opposite end of the

The procedure for turning

up

(M-3,

This allows time for

above it

M-lOO)

or in (M, M-2) and hold it for approximately eight

the starting

synchronous speed- While still holding the "start" switch,

"run" switch upward to its

on the

"on" position. This turns on the synchronous motor

and at the same time introduc,es a resistor

organ

motor

is as follows: Push the "start''

to bring the generator up

in series with the starting motor

to

generator.

it is

the vibrato scanner.

up to speed

switch

seconds.

to slightly

push the

As

by

to reduce its power- Hold

release

During

reduction

it-

this time the braking action of the synchronous motor, together

in power of the starting motor,

the "start" switch about four seconds longer and then

brings

the system

speed so that the synchronous motor can carry the load.

To

turn

off the.

organ, push the "run" switch downward to the "off" position.

a

TONE GENERATOR

with the

to synchronous

All tones of the organ originate as electrical signals

assembly. The M, M-2 and M-3 contains

85

Each of these wheels has various numbers

ing them at various speeds from a main shaft extending

pair of

held between two coil springs, forming

tone wheels is mounted on

a

shaft

a mechanical vibration filter. As the

gear is not rigidly attached to the shaft,

stopped accidentally

Adjacent to each tone wheel

will not interfere with the operation of

is a magnetized rod with a pick-up coil wound

tone wheels while

of teeth, with suitable gears for driv-

and

between them

any pair of wheels which may be

in the tone generator

the M-lOO has 87,

along the center. Each

is a

bakelite gear

the others.

on

it. These magnets extend through the front

held by set screws

Figure

drawing

13

shows where

the

dotted lines indicate frequencies whose

which can be loosened in case adjustment

to find the magnet for any frequency

same shaft.

On top of the tone generator assembly

forming

replacing. In

condenser must be replaced

tuned filters for the higher

case one filter becomes inoperative,

with a matched set from the factory. Figures

are small transformers and condensers

frequencies. They are not likely

and back of the generator, and are

is ever

number.

necessary.

In

this

tone wheels are on the

to need

both the transformers and

14,

15

16 and 17 show the locations of these filters

»

few frequencies

use untuned filters

on the indicated models. A

consisting of coils alone.

The output frequencies of the

tone generator are numbered

, for convenience,

in

order of

second,

numbers

17

In case

on M-lOO) are

Suggestions"

increasing frequency. The

and the highest, number

1 to 12

any generator frequency

for the procedure to be used

(1 to

omitted; and numbers 18 to

The output terminals

ter transformers,

to

lowest,

91,

13

of the generator consist of

which

on M-lOO) are used for pedals;

is weak or absent,

the manual cable and pedals

is about

number

6000 cycles per second.

91 are used for

in locating and correcting

, is about 32 cycles

1

numbers 13 to

the manuals.

refer to

"Practical Service

solder lugs mounted

are

connected*

per

Frequency

17

the trouble.

on the fil-

(14 to

The fre-

quency numbers

of all terminals

MANUALS

Musical frequencies from

inal strips on the

Each of

3-1/2

octaves. The

they are

C on the

the two manuals has forty-four

arranged so that keys of

upper manual

two manuals and from

two manuals do not

and the key in line

are indicated in Figures

the tone

14,

15, 16 and 17.

generator go through the manual

them to the

(44)

playing keys, or approximately

key contact springs-

cover exactly the same pitch

like pitch are

in line. Middle "C"

with it on the lower manual.

cable

to term-

range, but

is the

first

Under

each key

monics of

ed, (Some

low)

-

avoid

In case

(shown

All

corrosion, and the

a contact becomes

in Figures

wise and

The

busbar shifting

are a number of contact

that key) which touch

keys at the right end of

contact springs

and busbars have

an equal number of

each

manuals are sealed

dirty in spite of these

3, 5,7)

thus provide a fresh contact

mechanism is

is provided

somewhat different

springs (for

busbars when

manual

have fewer

precious metal contact

to exclude dust so far

precautions,

in each manual

surface.

the

fundamental

the

and har-

key is

press-

springs, as noted be-

surfaces to

as possible.

busbar

a

to slide the busbars

on the M-lOO than on prior

shifter

end-

models of

the Hammond Orgam

ual on the left hand end,

from

metal

tongue can be moved

ual

cover to gain

The

strips. The manual

the front

of this

tongue with

shifter is

in a similar place, but

access to it.

key contacts

block is a drilled hole.

a punched hole. Using either

in and out and

are connected through

wiring

Models M, M-2

a black wood end

it in turn moves the busbars.

requires removal of

resistance wires to the manual

chart

Figure

and M-3. Looking under

block will be observed.

Within this drilling

long nose pliers

the generator dust

18,

shows how the contact of

the

One

or a

lower

half

is a

hook,

man-

inch

small

this

The upper man-

terminal

each key

are

of that

inasmuch

connected to the

particular

as the highest harmonics

tone generator

M-3

row have

The

and M-lOO are

contacts connected

busbars of

the harmonic

bars"

tab in the M-IOO-

proper frequencies to supply

key. The

and are not

keyed through the 6th

each manual,

drawbars for

the fundamental and harmonics

blank

spaces

of the highest

indicate

keys are above the range of the

that no key contact

required. Since the percussion

harmonic busbar, the blank spaces

to ground through resistance

each one carrying

that manual in the M,

certain harmonic,

a

M-2, M-3 and through the "Draw-

control tubes in the

wires.

are

is used,

in this

wired

to

8

HARMONIC

DRAWBARS

The left group of eight

lower manual, and the

By sliding these drawbars in and

tal and

harmonics (or

right group

overtones) in

(8)

pulled out determines the

bar is set all the way in, the

mixture. Neither manual will play

out at least part of the way in the case of the M, M-2, M-3, or with

bars^' tab pressed or preset tab pressed in the M-100.

harmonic drawbars

of

out,

nine

the organist is able to mix the fundamen^

various porportions.

strength

of the corresponding harmonic;

harmonic it represents

unless

(9)

at least one of its drawbars

(Figure

19)

is associated

drawbars controls the

The distance

and if a draw-

is not present in the

with

the

upper manual.

a bar is

is pulled

the "Draw-

The drawbars slide over nine

each

drawbar has two contacts connected together by a one ohm resistor. As the

drawbar moves, at least one

(9)

of

and therefore there is no "dead spot" in the drawbar

busbars , representing intensity

the contacts

is touching

some busbar

motion. The one ohm re-

levels, and

at all times,

sistor avoids an actual short circuit between adjacent busbars. These busbars extend

two groups of nine

bars, are connected

transformer. Similarly, those

the length of the drawbar assembly but are split in the middle to form

(9)-

to

Those in the left group, under the lower manual draw*

low impedance

in the right group, under

primary taps on the

lower manual matching

the upper manual

drawbars, are connected to taps on the upper manual matching transformer- Sig-

nals from the

the lower manual "Vibrato Cancel" and upper manual "Vibrato Cancel" tabs to the

apraplif

ier input

high

terminals

impedance secondaries of

-

these two

transformers

go

through

PEDAL DRAWBAR

The 12 (M, M-2, M-3) or 13 (M-100) playing pedals are operated by the left foot

and are connected to

center drawbar adjusts the volume

denser (shown in Figures

the

lowest 12 or 13 frequencies of the generator. The

3,

5,

and

of

7)

the pedals. It operates a variable con-

which is connected to the pedal section

of the amplifier. For operation of the circuit see description of "amplifier,"

PEDAL KEYBOARD

The 13 playing pedals are operated by the left foot and are connected to the

lowest

13 frequencies of

the generator.

Like

the

manuals,

they have

light and

dark keys arranged in the standard octave pattern. Figures 20 and 21 identifies

the pedals

and

shows the generator frequency number associated with each.

A "pedal contact" on each pedal opens when the pedal is pressed, thereby allow-

ing

the correct generator frequency

to

reach the amplifier. In addition there is

a "pedal keying

It serves to key

rate-

contact''

the

pedal amplifier, causing the note to sound at the desired

When a pedal is pressed its "pedal contact" opens

note. Immediately the "pedal keying contact" closes,

When the pedal is released a mechanical latch keeps the "pedal

so that the last-played pedal note continues to sound for a length of time de-

for

all

pedals, which closes when any pedal is operated.

first, selecting the correct

causing the note to sound.

contact"

open,

termined by the position of the pedal "Fast Decay" and "Pedal Legato" tabs in

the M-100. In the M, M-2, and M-3; the time which the pedal sound is

heard is

determined

control"

attached to the expression control. The electrical

by

the setting of the "Pedal Decay" tablet

circuits is described under "amplifier"-

9

and

a

"Pedal sustaining

operation of these

EXPRESSION

PEDAL

The "expression" pedal, sometimes called "swell" pedal

is

and pedals

condenser mounted

by

(opened) by

In the

ing

pedal.

operated

by the player's right foot and varies the volume

together. It is connected mechanically

on the amplifier. When the pedal is

pushing on the

player's heel the music is softest,

Che player's toe the music is

M, M-2, and M-3, attached

control" lever, which

If

this lever is not pressed,

loudest-

to the expression

is operated by sliding

each pedal note dies

to a special

pedal is a

the foot sldewlse

(Figures

of both

,

1

2,

variable

tilted back

and when pushed

"pedal sustain-

away rapidly or

(closed)

on the

4,

and

manuals

air

forward

6)

slowly,

is pressed to

depending on

the left, the last-played

CONTROL TABLETS

The Model

each

has two

overall

tablet "pedal decay"

leased.

determines how fast

M has

positions (figures

volume

determines how fast

the setting of the "pedal decay"

6,

while

the M-2 and M-3

1,

and thus supplements

a pedal note

the sound

pedal note dies away much

have 7 of these control

2

and

the expression pedal.

4).

The "volume" tablet

sounds after a pedal

dies away after the

tablet. If

The "pedal

is depressed,

pedal is re-

the lever

more

slowly,

tablets

changes

attack"

and

the

and

The "vibrato

effect

The next

(it

be

is effective

set

on and off

tablet provides

for

"small" or

ation provided

The M-lOO

To have

and "Ensemble"

has

the instrument sound after

lower manual"

and "vibrato

independently

a choice of

only when the vibrato

"normal" vibrato

by the vibrato

24

tabs, each

mechanism,

providing some

will place the upper

solo manual" tablets turn

on the lower and upper

"normal vibrato" or "vibrato

effect is on). The

to adjust the

extent of the pitch vari-

change in the instruments

turning it

and lower manual

on, tabs such as "Full

in operation. A

the vibrato

manuals respectively.

chorus"

last tablet can

operation.

Organ"

tab is

in use

right

when in the down position.

as they appear on the

PERCUSSION

The M-3

unit

In

is

the Upper

pressed. Pressing either

has four

the M-lOO, these

and the M-lOO

CONTROL TABLETS

are the only two Models which contain percussion

(4)

associated tabs.

tabs operate only when the upper

manual is played,

Functions of the various

instrument are given

"Second Harmonic"

or

cause the tone to sound

in the following paragraphs.

"Third

tabs from left to

and each

manual "Drawbars" tab

Harmonic" will, when

percussively (in addition

to sustained

cussive

greater

tone, "Fast Decay"

rapidity- "Percussion

organ tones).

Both tabs can

causes the percussive

Soft" reduces the

signal.

In the M-3, when the "Percussion"

ual will play 2nd

tained organ

cussion tones

of

the Solo manual

tones). The

to soilnd percussively

or 3rd harmonic

"Volume"

sustained organ tones to maintain

be

pressed,

giving a combination per-

tones to fade away with

volume for the percussive

on-off

tones percussively (in addition to the

tablet in "Normal"

as with the M-lOO and

tablet is "On", the Solo (Upper) man-

position

allows

the per

reduces the level

proper

balance between

sus-

the manuals.

only

tones.

away

softly and restores

The "Decay"

when the Solo

In

"Soft"

position

it allows the percussion tones

the full level of the Solo

tablet determines

manual key is pressed.

how

fast

10

to sound

manual sustained organ

the percussion tones fade

•

Operation of the electrical circuits associated with

are described in the percussion section of

the amplifier theory.

VIBRATO TABLETS

The

available with

third

The M-'2, M-3,

trol tablets to vary

Model

tablet marked "Vibrato"

M vibrato

the

and M-lOO have a selective vibrato

uses three control tabs- Two

"amount

of

Vibrato" tablet

and the "Vibrato

turns the effect on or off.

the vibrato

effect.

On the M-lOO series

degrees of

system, using four

the percussion

vibrato are

Chorus".

only, an addit-

feature

A

(4)

con-

ional

Vibrato

The

and thus is fundamentally

It

and forth

vibrato effect

is comparable to

stop (Vibrato Cancel) to the right of

effect to be cancelled immediately.

is

on a string

created

the

while playing, varying the frequency

constant volume.

The

Hammond

Vibrato equipment

different from a tremolo,

effect

the preset tabs permits

by a periodic raising and

or loudness variation.

produced when

(See Fundamental Diagram of

a violinist moves his finger

any

lowering of pitch,

while maintaining

Vibrato

System,

back

Figures

22, 25,26)

percussive tones)

shift

network

or electrical time delay line, composed of

filter sections,

so that it scans

back and forth along the

varies the frequency of

by continuously shifting their

and a capacity type

Electrical waves fed

(the amount

the line the

per section being

phase is retarded relative to the previous

all tones (excepting the pedal

pickup or scanner, which is motor

line.

into the line are shifted in

proportional to frequency),

and

phase. It includes a phase

a number of low pass

driven

phase by each line section

so that at any

tap

of

The

scanning pickup traveling

ingly retarded in phase

lent

becomes

to end of the line

to an instantaneous change

a continuous frequency variation. Since the

and then back, it alternately raises and lowers the output

frequency, the average

The exact amount

shift

because

in the line but also on the

the scanner is driven by the synchronous running motor of the organ.

of

frequency

along the line will thus encounter waves increas^

at each successive tap. As a shift in phase is equiva-

in frequency, the continuous change in phase

scanner sweeps

from

start

remaining equal to the input frequency.

shift depends not only on the amount

scanning

rate. This rate, however,

of

phase

is constant

In

frequency

and only one fourth of

In the M-lOO, the

by causing two thirds of

line when

A vibrato chorus effect,

the

M, M-2, and M-3, the "Amount of Vibrato" tablet varies

shift by causing the

it

for

"Vibrato Small"

the line to be

in the up position.

whole line to be scanned for

"Small Vibrato".

Tablet

varies the amount of

scanned,

in contrast to the entire

similar to the effect of two or three slightly out-of-

tune frequencies mixed together, is obtained when the vibrato

the

"Normal

amount of

Vibrato"

frequency shift

output signal

is mixed with a portion of signal without vibrato. This

"Vibrato Chorus" tab, which causes only part

across the vibrato line and the

As

line but not to

duces a chorus effect

the vibrato effect is applied to the part of the

the part appearing across the

-

rest across

11

a

of

the

resistor in series

resistor, the

Incoming signal to appear

signal

is accomplished by

with the line-

appearing across the

combination pro-

the

.

In the M-lOO, a Celeste

effect

is

obtainable by the

and "Vibrato Celeste II" tabs. These

Use

line,

signal to appear

In

in "off" position

line.

vibrato effect

of these tabs introduces a resistor network at the far

changing the termination impedance. This in

in the line, which is picked up by the scanner.

the Model M,

to remove the vibrato effect entirely, the

places a very large resistor in

Practically

is virtually eliminated. A compensation

all of the signal appears across

can be

use ''Vibrato Celeste

used independently

end of the Vibrato

turn causes

'Vibrato" tablet

series with the vibrato

this resistor and the

circuit consisting of

or together.

a

reflective

I"

Rl and CI

"vibrato"

Figures

sent through

is

not desired

position

Figures

maintains constant volume

tablet "off".

23 thru 26 show only

this channel

on one manual or both, the "Vibrato Cancel"

feed their signals through

27,

28

and 29 show the vibrato line box. See figures

location of line box.

by introducing negative feedback

(See

Figures

the "Vibrato" channel of the amplifier.

23 and

24).

have the vibrato effect. In

the "no Vibrato" channel of

the M-lOO,

tabs in

the amplifier.

3, 5,

with the

All tones

when vibrato

the down

and 7 for

The

per

plates and

shows

the

Signals coming from the vibrato line

scanner is mounted on the synchronous motor

minute- It

a

the construction of

rotor-

rotor whose

is

a multi-pole

plates mesh with the stationary ones. Figure

the scanner , with two sets of plates removed to

variable condenser

appear on the stationary plates and are

picked up, one at a time, by the rotor.

carbon brushes

tact

pin and a third presses

as shown in

Figure

on

the

30. Two

end, in order to eliminate the

and driven at 412 revolutions

with 16

sets

of stationary

30

Connection to the rotor is made

brushes

touch

the sides of the con-

possibility

show

by

of

The complete electrical

diagrams

PRESET

contact failure.

contained in

TABS CM- 1 00)

circuit of the vibrato system

the back of this manual-

Four tabs are provided for

using the drawbars

REVERBERATION

AND VOLUME

or playing the preset tones indicated

SOFT TABS CM- 1 00)

each manual. As indicated,

is shown in the schematic

they provide a choice of

on them.

Several degrees

of reverberation

labeled ''Reverberation

turning

sistive network

this feature on,

used in conjunction with

controls the overall

might

AMPLIFIER

In the M and M-2

actually

disturb

ASSEMBLY

composed of four sections: Manual, Pedal, Intermediate, and

others

models, the amplifier assembly

I" and "Reverberation

govern the loudness or amount of reverberation by

volume of

are obtained by the use of either or both tabs

II", These tabs in addition to

the speaker. The "Volume Soft" tab

the

organ and

is

especially

is on a single chassis, but is

useful where playing

Output

a

,

re-

as

indicated

in

the

block diagrams, figures 8 and

schematic section of

this manual.

12

9,

and

in

the

schematics in the

In

the M-3 and M-lOO

models there is one additional section, the percussion

amplifier. The

The M-lOO model

Amplifier. This

in conjunction

block diagrams appear

alone has one

separate

with the Reverberation

MANUAL SECTION OF

The manual

section, composed of tubes VI and VZ, receives its signal from the

amplifier is used

AMPLIFIER

additional amplifier assembly, the Reverberation

MODEL

M

in Figures

to

unit. This amplifier

secure the Reverberation effect

10

matching transformer Tl. The "special input" jack,

work to the cathode of VI, provides a low

impedance input circuit (see

and 11,

has

its

own

connected through

speaker,

a

net--

"Special

Equipment")*

sisting

put of VI, The output signal obtained from the cathode

line (see "Vibrato system") and the manual signal,

of

C2, R2,

Some

treble attenuation is provided by a

and R3, connected from cathode follower tube V2 to the in-

after

feedback network

of V2

drives the vibrato

passing through the

vibrato system, is combined with the pedal signal at the grid of V3.

MODEL M-2» M-3

The manual section is composed of two channels connected to

"no Vibrato" input terminals. Either of the two matching

feed

a signal into either input channel, depending on whether

the "Vibrato"

transformers

the correspond-

con^

and

can

ing control tablet is set for Vibrato "on" or "off".

Signals entering

the "no

directly into the intermediate section of

into the "Vibrato" channel (tubes VI and V3) pass through the

first- The output signal of the Vibrato system is combined with the "no Vi-

brato",

fier.

Percussion^

and

Suitable tonal balance

Vibrato" channel

(tube

the amplifier

V2)

are

amplified and fed

while

signals going

Vibrato system

Pedal

is secured in the "no Vibrato" channel by a feedback

signals at the

grid

of the

intermediate ampli-

network connected from plate to grid of V2. Similar tonal balance is provided

in the "Vibrato" channel by a feedback network connected from cathode

V3 to the gird of VI- The two channels are matched by selecting R27

R20 (M-2) at the factory-

follower

(M-3),

and

M-100

The manual section is

"no Vibrato" input terminals- Either of the two matching transformers can

a signal into either input channel, depending on whether the

trol tablet is set for vibrato "on" or "off".

composed of two channels connected to the

corresponding con-

"Vibrato"

and

feed

Signals entering the "no Vibrato" channel (tube V2) are

ectly into the intermediate section of the

the "Vibrato" channel (tubes VI and V3) pass through the

The output signal of the Vibrato system is

pedal

signals

at

the grid of the intermediate amplifier.

Suitable tonal balance is secured in the "no

work consisting of

C6, R12,

R13 and R13A connected from plate to grid

Similar tonal balance is provided in the

including CI, Rl, R2, and

R2A connected

from cathode

amplifier, while signals going into

combined

with

Vibrato" channel by a

"Vibrato" channel by a

follower

amplified and fed dir-

Vibrato system first.

the "no Vibrato" and

feedback

of

feedback

V3 to the

V2.

network

input

net-

of VI.

The two channels are

matched by

13

selecting R20 at

the factory.

.

PEDAL SECTION OF AMPLIFIER

-

Mi M-2i M-3

^

The

the

delivering

cannot

tive

Near

als) closes. This

ing the

pedal amplifier, composed pedal generators. When a

a signal voltage of the proper frequency

sound instanly,

21 volt

the end

grid bias.

of the pedal

bias condenser

however, because the tube

shunts

C57 and allowing

of one

pedal

tube,

key is

stroke the "pedal

a

resistance

from the

the note

V7, receives

pressed its

to the

is normally

its signal

"pedal contact"

keying contact"

bias point

to sound.

directly

grid of

cut off

(common

to ground,

V7, The

from

opens,

note

by

to all ped-

a nega-

discharg-

If "pedal

the bias

charges

In

the

takes

the

case "pedal

addition of

an appreciable

note

When the

attack" is

condenser when

the condenser,

attack"

R69 and so

at "normal"

the pedal

and the

is set at

the bias condenser

time, therefore,

sounds

pedal key is released,

only a single resistor

keying contact

note sounds

"slow"^ the shunting

for

the pedal

R68 is

closes. This

quickly, although

resistor

cannot discharge

the bias

keying contact

to drop low enough

opens, allowing

placed

across

very quickly

not abruptly.

is increased

as

quickly- It

so that

cutoff

dis-

by

bias

occurs

at "normal"

to be

applied again to the

rapidly, since R74

tone to sound

If to left), an

of

A latching

the "pedal

C57 still

mechanism

tube. With

charges C57

the increased resistance

for a longer

sustaining control"

additional resistor

further and causes

holds the

time.

is operated

R76 is

the note

last-played

"pedal decay"

in a short

delays the

(lever on expression

introduced. This

to sound for

pedal contact

set at "fast"

time. With "pedal

charging of C57

and permits

delays

a much longer

open until some other

this

decay" set

the

pedal pressed

the charging

time.

pedal is

out

The

fier

the

in

the decay

pedal cutoff

tube.

pedal drawbar

"Practical Service

operated, in order

period.

adjustment R73

It must be

and expression

adjusted so that the

Suggestions".

to Insure that

varies the screen

pedal set in

M-lOO

the correct note

voltage of

pedal tone is

just inaudible with

loudest position,

will sound through-

the pedal ampli-

as instructed

The pedal

from the

opens,

+

The

off

note cannot

by a negative

Near

pedals)

delivering

the end of

closes.

charging

amplifier,

composed of one

pedal generators-

a signal

sound instantly,

22 volt

the pedal

This shunts a resistance

the

bias condenser

tube, VIO, receives

When a

pedal key

is pressed its "pedal

voltage of the proper

however, because

grid bias.

stroke

the "pedal keying contact"

from that

C57 and allowing the

its signal

frequency

the

+

tube

to the grid of

is normally

(common to all

bias point

note to sound.

directly

cqntact"

VIO.

cut

to ground, dis

When the

off bias

pressed this

tab up, the increase

to sound for

pedal key

to be applied

occurs rapidly,

a longer

is released,

again

to the

since R81 charges C57 in

resistance

time.

the pedal keying

tube. With the pedal "Fast

contact opens, allowing

delays the charging of

14

cut-

Decay" tab de-

a short time. With the

C57 and permits the tone

"

If

This

much

A

the

delays

longer time.

latching

pedal

the decay

The

"Bass Mute"

higher

"Pedal

is

frequencies

Legato"

the charging of

stop Is depressed,

mechanism holds

operated, in order

period.

tab varies

are bypassed

an additional

C57 still further

the last-played

to insure that

a filtering

to ground,

circuit in

and

causes the

pedal contact

the correct

the VIO tube

giving

a deeper tone

note

resistor

note to

open

until some

will sound

R82

is

output

to the

introduced.

sound

other

throughout

so

the

pedals.

for

a

The

tube. It

drawbar

Service

To prevent

pedal cutoff

must be

and expression

Suggestions.

a pedal

sistance of five

tube tube

lengthens

is conductive.

adjustment

adjusted so that

pedal set in

note from sounding

ohms

its warm-up

inserted in series

R85 varies

the pedal

time so

that the cutoff

Che bias voltage of

tone is

loudest

position,

when the organ

with

the heater of

just inuadible

as instructed

is first

bias

the pedal

amplifier

with

in "Practical-

turned

the pedal

is applied before

on, a re-

amplifier

the pedal

the

INTERMEDIATE

From

the plate of

variable air

amplifier

is

(M-3,

mixed with the

M-lOO).

Depressing

and

pedals

(half of V3)(M),

the "Volume Soft"

by shunting a small

SECTION OF AMPLIFIER

the pedal amplifier

condenser (operated

V4 (M-2, M-3,

vibrato, non-vibrato,

tab reduces

condenser across

tube the

by the pedal

M-lOO) . At

and

the overall

percussion

pedal signal

drawbar)

this point

to the intermediate

signals from the manuals

volume of both

the input of

passes through

the pedal signal

manuals

the intermediate

a

amplifier.

series with

of the pedals-

The

is a means of

cuit

factor

a suitable load

small feedback

the effective

of the

At

the pedal

increasing

tube,

the same time it

generators and

condenser from

the

input capacity

or a total of about

for the output of

effective

provides pedal

thereby increasing

plate

to grid

input capacity

is this value

1500 micromicrof

the scanner

compensation

the relative volume

of

the intermediate

of the tube. In this

multiplied

arads , This

and the pedal

by adding R65

in

amplifier

cir-

by the amplification

provides

drawbar,

The combined

to

variable

the expression

air

stationary

transitted

the

signal

manual

and pedal

control

condenser with

plates.

With the expression

directly to the

goes through

a tone^compensated

(operated by

grid of the following

mediate positions the signal

tinuously

OUTPUT

SECTION QF

variable

control,

AMPLIFIER

signals go through

the expression pedal),

a single

set

of

movable

pedal

in "loud"

attenuating

is obtained from both sources, providing con-

(M)

the intermediate

which is

plates and two

position the signal is

tube,

while in "soft"

network. At

amplifier

a special

sets of

position

inter-

V4

V5

is a

and V6*

"Special

makes

M

consoles below

back

the pedal

connection

common-cathode-impedance

The second

Equipment").

response more

serial

is not used;

grid of V4

A small feedback

uniform

number

C46 is

3000, with amplifiers

phase inverter

provides

a radio-phonograph

condenser

by reducing speaker

omitted, C37 is

15

driving push-pull

input channel

from voice

resonance. (In model

marked

omitted, C42 is

coil to grid of

type M-A, this feed-

output tubes

(see

V4

.00135 mfd,,

and

T2

does not

have a secondary center

M-2i M-3

tap)

The second

V6. A small feedback condenser

V4

makes the pedal response

condenser

at the factory.

The second

V6, which

half of V3 is a phase inverter driving push-pull

more uniform by reducing

(located in the expression

half

in turn drive two

of

V3 is

a

phase

16

C22

inverted driving

ohm

output

Cm-2),

C23 (M-3) from voice

speaker resonance.

control

unit) is variable and is

M-lOO

push-pull input tubes

speakers connected in parallel,

tubes V5 and

coil to

adjusted

A small

grid of

This

V5 and

feedback condenser

the

(located

factory.

pedal

response more

in the expression

PERCUSSION SECTION

The 2nd

the harmonic

former and

proper loading

or 3rd harmonic signal (M-3)

selector tabs) is conducted

amplified by tube

on the matching transformer

C23 from

output transformer

uniform by reducing

control unit)

OF AMPLIFIER

V7. The resistive feedback

secondary to grid

speaker resonance.

is variable and is adjusted

or both (M-lOO) (depending

through the

to fix the primary

percussion matching

on this tube provides

of V4 makes

This condenser

at

on position

the

trans-

impedance at

of

about

5

ohms. This provides

cussion output signal is about

Besides

has another

through equivalent

The control

or third harmonic

control tube,

providing push-pull

winding which feeds

key circuit

tube (V9) is normally conducting,

percussion

transformer T6,

signal for the

grid of V4,

a volume compensating

the same whether

one key

control tube

signal to

the 2nd or 3rd harmonic

resistors.

so when a key is pressed

signal first

a band pass filter

sounds loudly. It

network, and

effect

or

(V9),

so

that the

several

transformer

passes through the

terminal D

per-

are played.

T5

drawbar

"^

the second

to the

Imrr.ediately

effect. This

"on'', terminal K (normally

(R-53) is connected

key is pressed,

erator filter. This

open-circuiting

then

drift from their

ential (about plus

the note begins

fading Is accomplished

to the

terminal K

virtually

the tube and isolating the

operating potential

15 volts)

to

held at

solo manual 6th,

is grounded through

discharge through R59 and R60-

fade

away, giving

as follows: When

the characteristic

the percussion

plus 25 volts through anti-spark

(8th in M-3) harmonic busbar*

the key contact and the

grounds the plate of V8

(connected as a diode),

control tube grid circuit.

of about plus 25

at a rate determined by the

percussion

switch is

resistor

tone gen-

The grids

volts to a cut-off

time required for

When a

pot-

031 to

The

keys

percussion signal

of

the

solo manual are

volts. The time

after

through

a key is released)

R57 and R58.

is now blocked.

released and

of this rise

is the time

No percussion notes

the control grids again rise

(that is, how quickly

required to change C31

can sound until all

to plus 25

the control tubes turn on

to plus 25 volts

again

16

.

When

tabs are down,

ed from their

are

or 8th

(which

used to

or

8th

When

the percussion

connected to

(M^3)

is grounded

turn

(M-3)

the

"Percussion

Second Harmonic"

the corresponding upper

lead wires

the percussion matching

drawbar is

through

off the push-pull

is not available

Soft"

and

also disconnected from

the generator

tab is depressed,

these

or Third

manual

wires

magnets when

control

on the upper

tube. Therefore,

Harmonic" (>i-3)

harmonic

(which come

transformer.

its

lead

manual when

it reduces

drawbars

from

The

wire and this

any

the

or

are

the manual

6th harmonic

key

the

is pressed)

6th harmonic

percussion

volume

both

(M-lOO)

disconnect-

busbars)

(M^lOO)

wire

is

(M-lOO)

is in use.

by shunting

resistor

The

a k-ey

percussion

is pressed.

charges

cutoff

is shunted

in about 2-1/2

R50 across

capacitor

across the

capacitor C31

to cutoff

ness

between

in

the percussion

"Fast

Decay"

When a

C31, reducing

seconds.

original

and thereby

less than

"slow" and

tab determines

key is pressed

the D,C.

When the

resistor R60,

reducing

1/2 second.

"fast" decay

output

transformer.

how fast

with

voltage

tab is pushed

the D.C.

To preserve

voltage

settings,

the sound

the tab up,

on the

reducing

on the

about

shunt

resistor R62

fades

resistor

control

tube

down another

the time

to discharge

away

R60 dis-

grids

resistor

control tube

the same effective

is disconnected

after

to

grids

loud-

when

tube bias

With

the decay

the "Second

bar wire

fed the

back

upper manual

matching

Both tabs

one

or the

tab is in "fast"

and thus

Harmonic"

is connected

to the 2nd harmonic

3rd

transformer

can be used

other is

increases

tab depressed,

to the

harmonic

and a signal

at the

available.

position.

the loudness.

percussion

drawbar-

matching

With

drawbar wire

is fed

same time

in the M-lOO,

This

the upper

reduces the

transformer

the "Third

is connected

back to the

effective

manual 2nd

and a signal

Harmonic"

to the

3rd harmonic

however

in the M-3,

control

harmonic draw-

is

tab depressed

percussion

drawbar.

only

POWER SUPPLY

The

TUBE

Voltages

Line

To make

power supply

SOCKET VOLTAGES

shown on the

variations

tube sockets

amplifier; screws and

(ALL

MODELS)

uses a

5U4 rectifier

schematics

may cause

accessible,

loosen

cable clamp

turn amplifier

are

up to 20%

remove lever

on lower

upside

down, being

tube with

taken with

variation in

from

shelf; remove

careful

a

a 20,000 ohm-per-volt

conventional filter

the indicated

voltages.

shaft of expression

four

not to rest

amplifier mounting

on expression

circuit.

meter.

unit

on

unit lever.

should

be depressed

REVERBERATION

When either

played will

"Reverberation

be

normal sound

f

ier

this purpose,

•

A separate

The

tabs and

unless

AMPLIFIER

reverberated.

produced

amplifier

expression lever

specified,

(M-lOO)

I," "Reverberation

through

and speaker

may be

II,"

This reverberation

the two

12"

are

speakers connected

incorporated in the

in any position,

or both are

signal

is in addition

to the

and no key

used, the music

to the

main ampli^

instrument for

A signal from

goes through

of

s chema

the reverberation

tic d ia g ram

the voice

a resistor

unit,

coil

terminals of

network

as shown under

the regular

and two Incandescent

"input to reverberation

17

speakers in the

lamps to

the drive

unit" in

console

coils

the

The

cuit.

incandescent

crease

lamps are

When

in resistance,

the organ

is

and,

played

used

as volume

loudly,

therefore,

the

limlters

lamp

amount

or

volume

filaments

of signal

compression

become

hot

furnished

cir-

and

to Che

In-

reverberation

berated

of

The

reverberated

drive coils

signal.

unit

does

This

signal

introduce

bounce hack and forth

in a

input

large

of the

room.

Pickup

amplifier.

not increase

is a

is

desirable

needed

at

vibration

in the coils springs to simulate natural echoes

coils

The

amplifier

at the

SPECIAL

as

musical

fast

as

effect,

low volume

in

two

other

coil

end

output

EaUIPMENT

the volume

levels.

springs.

of

the two

drives

since

an

8 ohm

of

a

the

greater

These

springs

8"

no-rever-

vibrations

drive

speaker.

proportion

of sound,

the

RADIO.

A

er

phonograph,

if

control

of

about

expression

ed

In

apply

case

ance

at the

the Model

connect

to ground

PHONOGRAPH.

connected

unit of

1/2

pedal nor

same

M only,

vibrato

coll terminals

expression

fective

on

pedal,

the

radio,

to

the

volt

time.

OR

the

organ

maximum,

MICROPHONE

or

the

occasionally

to

to the

of

the

(about

an amplifier

signal

7000 ohms)

"volume"

input signal

microphone

jack

marked

amplifier

amplifier.

and

must have

"Volume" tablet

for special

jack

from

market

a phonograph,

and may

having

tablet,

just

and

as

will

"RADIO-PHONO"

The

device

its own

will

affect

effects

radio

"SPEC-INPUT".

conveniently

a level

three

they

are on

of

vibrato

play through

should

volume

This

about

the

organ

located

have

control,

it.

it

or

microphone.

The

may be

point

be

driven from

5 volts

tablets

music.

on

an

the

output

as

organ

organ may

desirable

has

a low

maximum.

will

then

speak-

expression

level

neither

be

to

In this

the

play-

imped-

the

voice

The

be ef-

EXTENSION

An

to

nected

the

to

wires

additional

the

organ

to

speaker

bring

may be

Hammond

ing

the

SPEAKER

speaker,

if special

the two

be

out

Organ

at

the

left

tone

necessary

of

the

circumstances

voice

least

organ

coil

10"

pedal

connected

cabinets

connections

permanent

terminals

in

diameter

notes

or

may

not,

be used

can be

magnet

make

on

and be

properly.

as

desired.

as extension

the

secured

it

dynamic

desirable. amplifier.

mounted

The

from

console

speakers.

your

type,

It should It is

in

an adequate

speaker

dealer.

may

be

attached

be

con-

essential

baffle

voice

A kit

for mak-

that

coil

EAR Ear

PHONE

phones

disturbing

the^

resistor

nected

voice

of

across

(MONAURAL)

may

be

connected

others.

coil"

6

to

terminals

ID ohms,

these

to the

They

will

of

with

terminals

organ

generally

the amplifier,

power

whenever

rating

the

if

give

someone

adequate

with

not

less than

speaker

wishes

the

is

to

volume

speaker

10 watts

practice

when

connected

disconnected.

must

without

to

A

be

con-

18

EAR PHONE

(STEREO)

Stereo ear

matic below.

the

Clark,

house.

listed

Koss,

GN.

phones can give

A separate

resistors

or Telex are

Organ

and

Spk, wires

two

jack. Use of

pleasing results

pole

double

good

recommended

and can

T^J

when

throw

quality

attached

switch

ear phones

be secured

100

-a

is required

as shown

made

from

any

in the

in

addition

sch-

by David

parts supply

to

BLK,

SPECIAL

CN,

BLK-

POWER

©-

Rev,

*

SOURCES

Spk. wires

£:-3

jo.

10 10 W

The

voltage

source

will

organ must always

and frequency

is direct

be

necessary

watts capacity.

be connected

specified

current

to provide

or

to

on the

has a frequency

a converter

an alternating

name

or

current

plate. If

different

the only

from

motor generator

source

that

of

available

specified,

at least

the

power

it

170

ORGAN

(a) If

and If

wiring,

(b)

If the

with

is

DOES NOT

the

starting

the tubes

power switch,

generator

all

the

amplifier.

PRACTICAL SERVICE

PLAY

motor does

controls

do

not light with

turns

in

playing

In most

not operate

line

cord,

and the

respects

SUGGESTIONS

when

the'^Run''

line cord

tubes

light, but

position, the

this is

the "Start"

switch

plug, and

on,

wall

no sound

most likely

a conventional

switch is

check

the power

outlet.

can

source

be obtained

of trouble

amplifier

pressed

circuit, cate the

ONE KEY

(Tests

This may

generator.

(a) Ordinarily

DOES

to be made

NOT PLAY

mean

The

missing.

drawbar for

and the

trouble.

with

a dirty

steps

only

This

can be

that

schematic

OR A HARMONIC

"Drawbars"

key contact,

below will

one of the

determined by

manual,

observing

diagrams

IS MISSING

tab depressed)

a broken

serve

will

enable

connection,

to isolate

the

several frequencies

holding

on which drawbar

the key and operating

the service

or

a dead note

trouble-

used

on the key will be

the key falls

man

to lo-

in

the

each

to play

Reference

number

(b) See whether

of the

is missing.

same manual.

to

the manual

the same frequency

wiring chart,

The wiring

figure 18 will

is missing where

it is used

chart will tell with

19

tell which

frequency

on other keys

what other key

and

what other

on

one key but not on others,

drawbar you should

get the same frequency. If It is missing

key contact is probably dirty. In

a

some

cases it may be

staccato manner to

adjustment of

"manuals" section on a

This will slide the busbars

face. In extreme cases, it may be necessary to hold down the faulty key

while

(c) If the frequency is missing on all keys

making

manual, look

the

for

cleared by striking

the

loosen the

busbar shifter

prior page for location and

endwise

adjustment,

a break in

the cable connecting one manual to the other.

dirt. If this procedure

for

the key 15 or 20 times in a rapid

that

so

is

not effective,

manual will clear it, (See

manner of adjustment).

they present a clean contact sur-

of one manual but not on the other

(d)

(e)

If the frequency is missing on both manuals, check

cable or the generator

The output of any signal frequency on the tone

itself.

generator may

the manual-to-generator

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

15,

Is all right, the note

and

16

CAUTION; Never

such as a continuity

filter transformers and permanent magnets. By

for

location of all

will

test the tone generator

meter,

play

as

generator terminals. If the generator

loudly.

serious damage may result to the sensitive

with an outside source of current

the above method, all

Figures

14,

(f)

(g)

necessary tests of the tone

generator may be made with the

plied by the generator itself.

If

it fails to play, try

coil (not the grounded tap) and

(Figures

14,

15 and 16) in

touching

the input side of the filter

order

the

to

clip to the input side

check these parts. Disconnect the

condenser to eliminate the possibility of a grounded

the signal is still missing at the magnet coil

the tone wheel is not turnings the coil is

defective,

not properly adjusted.

If

the tone

wheel is not turning^ the frequency of the other

terminal, it means that

current sup^

of

the

condenser

transformer

or the magnet is

.

If

wheel on

filter

the same shaft will also be missing

which are alone). On the

the two frequencies whose numbers

the same

shaft.

slightly and feel the wheel with your finger

wheel is located directly

(h) If the magnet

factory, as replacement of a coil necessitates dismantling the

generator,

(i) It is

possible, although unlikely, that the

Antoher way

coil

is

(with the exception of a few

generator magnet location drawing

are connected by a dotted line are

to check the wheel is

to see if it is turning.

behind its magnet, shown in Figure 13.

defective, the generator

magnet may have become loose

must

wheels

(Figure

to raise the generator

13),

on

Each

be

returned to the

entire

and

be adjusted as

ONE NOTE IS

(a) Trace

moved

weakness

so

WEAK

the note

is due

far from the wheel as to make the not

described

as

to

reduced output of magnet coil. Check at each point

sities with

(b) It is possible that

higher

room and the furnishing,

inaudible.

in the

described in the preceding section

following paragraph.

to see whether

dirty contact, poor connection, defective

by comparing inten-

and

one or more notes

lower frequency numbers.

may be

although the actual

acoustically weak, due

signal level is

It

may

filter or

to the

equal to that

of adjacent notes. This

notes on an output

fier. All notes will not

from note to note.

meter connected to

In this test

can be checked by

the voice coil

give equal

output, but

variations of less than

20

reading voltages

terminals on the

voltage should

30% should

of the

vary smoothly

various

ampli-

be ignored

,

(c) Each

magnet

is

set

partially loosened, while observing an output meter.

that the magnets seldon need adjustment

proper equipment

Therefore,

ment.

PERCUSSION

(a) Adjust percussion

NOTES WEAKt DO

"Volume Soft" tab

it is not recommended that

at the

involves

NOT

cutoff

up,

upper

factory

by tapping it gently,

with the

Experience

and that setting them

danger of

PLAYi

control; with expression pedal wide

OR DO NOT DECAY

"Drawbars"

damaging both

the

service

PROPERLY

tab down, all drawbars

magnet and wheel. man

attempt

set

has

screw

shown

without

this adjust-

open,

pushed

in,

(b)

(c)

PEDAL

(a)

press upper manual

cutoff

"Third Harmonic"

and adjust percussion cutoff

or silence,

Check tubes V7,

Always adjust

percussion cutoff

NOTE SOUNDS AT

It

is possible

to

striking it very

downward. This

and "Fast Decay"

V8, V9-

control after replacing

FULL VOLUME (WHEN PEDAL

make

hard at an

will never occur if

a black

angle so that it moves sidewise

pedal lock down and play continuously

the pedals are used properly,

tabs. Hold down first

control

IS NOT BEING PLAYED)

to the exact point

V9

C12AU7).

as well as

C key

as

on

of

by

only slight pressure

(b) A

pedal locked down

It can

be released by pressing

opposite to the direction

PEDAL

(a) Set expression

NOTE SOUNDS

In this case the pedal

and leave three

with the toe

is required

in this way will remain

it down

of tilt.

No permanent damage

very hard, with a slight pressure

visibly depressed and tilted.

for

playing.

FAINTLY (WHEN ORGAN IS NOT BEING PLAYED)

cutoff control

pedal wide open,

pull pedal drawbar

may be adjusted as follows:

to its loudest

pedal tabs up.

will result.

position,

(b) Play highest

pedal

(c) Slowly

until pedal

(d) Always recheck

note to die away.

turn

pedal

note

HUM

(a) A loud

60

cycle

by electrical

picked up by

pedal key

cutoff

and then release it. Wait

adjustment (on face of

just disappears. Do not

this adjustment when

or 120 cycle hum

in the speaker may come

replacing the 6BA6

appliance, as explained

the matching transformer,

at least

amplifier)

15 seconds for

clockwise

turn it any farther.

tube.

from some near-

on the instruction card. It may be

the vibrato

line, or the console

wiring. Hum

input terminals

moving

(b) The faint

either the console

pedal note heard

may sometimes be

note sounds faintly

(c) Any other

hum

be cured by replacing

(d) In case hum

condensers,

from this source

on the amplifier

or the appliance.

when the pedal cutoff adjustment

mistaken for

when organ

must

originate

one or more

originates in the

its

source can be isolated

will disappear if

to the chassis. It may

hum. Check it as described

is not being played.

in the amplifier circuit,

of the electrolytic

amplifier but

is

you ground the signal

condensers.

not

due to the electrolytic

by successively removing tubes

be eliminated

by

needs setting

under "Pedal

and can generally

or

by

grounding successive

points in the signal

21

circuit

REPLACING TUBES

-

(a) The vacuum tubes

are all standard radio types

usual way.

(b) If the 6BA6 tube is

plained under "Pedal note sounds faintly when

(c)

If

tube V9 is replaced, check percussion cutoff adjustment as

under "Percussion

PROCEDURE FOR REMOVING PARTS IN NEED OF REPAIR

TO REMOVE KEY

FROM UPPER MANUAL (Mi M-2i

replaced, check the pedal

notes weak, do not play, or

M-3)

and can be tested in

cutoff adjustment

as ex-

the

organ is not being played",

explained

do not

decay

OR

REPLACEMENT

properly".

(a) Remove music rack by unscrewing

it from console.

(b) Remove music rack base by taking out two screws (c) Remove metal angle fastened

(d) To remove a black key loosen

across keyboard by two screws

its key mounting screw (See Figure

thumb screw, unhooking brace, and lifting

in

upper

key from screw and lift out key.

(e) To remove a white key loosen its key mounting screw and

black

white

keys.

key,

Unhook

these keys from screws, push them back, and

manual end blocks,

3),

those of adjacent

lift out

unhook

M-lOO

(a) Remove music panel

(b) Remove four screws which secure metal

(c)

(d) Pull

(e)

Remove two

It to upper manual.

drawbar

To

out

remove

large

black key,

a

and top.

screws located

on

extreme left

loosen its key mounting screw (See Figure

at ends of control assembly, which secure

and fold control assembly back,

hook key from screw and lift out key.

(f) To remove

black

keys. Unhook these keys

white key,

a

loosen its key mounting screw and those of adjacent

from screws, push them back, and lift out

cover on control

panel assembly,

7),

un-

white key.

TO REMOVE

(a) Remove music rack by unscrewing thumb screw, unhooking brace, and lifting

it from console.

(b)

(c) Detach pedal volume control (Figure

Remove

A KEY FROM

music

rack

ing wood screw which holds friction clip to top of

drawbar.

(d)

Remove upper manual mounting

LOWER

MANUAL (Mi M-2i M'3)

base by taking out two screws in upper manual end blocks-

3)

bolts "A" and

by removing two machine screws, loosen-

console, and

"B" under

keyboard

unhooking from

(Figure

33)

(e) Place a

3/4"

hold up upper manual sufficiently

accessible,

(f) To remove

key from screw and lift out key.

(g)

To

remove a white key loosen its key mounting screw and those of adjacent

black keys. Unhook these

white key,

a

board under each upper manual chassis mounting block; this will

to make lower manual key mounting screws

black key loosen its key mounting screw (See Figure

keys

from

screws, push them back, and

3),

lift

unhook

out

M-lOO

(a)

(b)

Remove

music panel

generator dust cover by taking out

and

top

ator shelf and loosening four screws in cover just below upper manual assembly

(c) Remove upper manual mounting

directly above front corners of generator.

(d) Remove two

screws which pass through angle brackets into upper

bolts

(2)

22

seven screws from edge of gener-

which are located at ends

manual.

of console

-

.

,

mounted on

front

(e) Tilt manual (f) Using

(g)

To

remove a black key,

of

1/4"

organ.

hook key from screw and lift out key.

(h) To

remove a

black keys. Unhook these keys from screws, push them

white key.

inside of cheek

blocks. These screws are

from front, being careful that It

box ratchet,

loosen key mounting screw,

loosen its key mounting screw

white

key loosen

its key mounting

accessible from

does not slip back.

(see Figure

screw and those

back, and lift

of adjacent

7),

un-

out

TO REMOVE A DRAWBAR CONTACT SPRING

(a)

(b)

(c) Pull out contact

Push

drawbar all the way in-

Remove screw and nut at back end of drawbar (Figure

spring while

contact. To disconnect spring

(d)

Do

is off, as damper

not under any circumstances pull drawbar

spring

will catch

entire drawbar assembly

M-lOO

(Mj M-2i M-3)

pressing

with thumb to release pressure on

entirely, unsolder wire.

forward while contact

in slot and ne'cessitate removal

3).

spring

of

(a) Remove music (b) Remove four screws which secure metal cover on control panel assembly,

(c)

Pull

out contact spring while pressing with thumb to release pressure on

panel

and

top.

contact. To disconnect spring entirely, unsolder wire.

(d) Do not under any circumstances pull drawbar forward while

is off, as damper spring will catch in

slot

and necessitate

contact spring

removal

of

entire drawbar assembly.

TO REMOVE A DRAWBAR OR DRAWBAR KNOB

(a) Remove music rack by unscrewing thumb screw, unhooking

(Mi

M-2i M-3)

brace, and lift-

ing it from console,

(b) Remove music rack base by taking out two

(c) Remove 8 hexagonal head machine screws

holding drawbar assembly and one

screw fastening angle across upper manual

(d) To remove

ful

not

to

knob

,

scratch

pull drawbar assembly toward front of console (be care-

control panel surface)

screws in upper manual end blocks

keys

prop it up, and remove

,

screw

which holds knob

(e) To remove drawbar and contact spring, pull them out at back of assembly,

while pressing with thumb to release

(f) To separate drawbar from contact spring remove screw and nut

pressure on contact.

at

back

end

of drawbar.

M-lOO

(a) Remove music panel

(b) Remove four screws which secure metal cover on control panel assembly.

(c)

Remove two large screws located at ends of control assembly which

It to upper manual

(d) Remove (e) To remove

hexagonal head machine screws holding drawbar assembly,

4

knob, pull drawbar assembly toward front of console (be care-

ful not to scratch control panel surface)

and top.

(Pull

out drawbar on extreme left) and fold back.

prop it up, and

,

remove

secure

screw

which holds

(f) To remove

pressing with thumb to release

(g)

while

To separate drawbar from contact spring

of

drawbar

knob.

drawbar

and

contact

spring, pull them out at back

pressure

remove screw and

on

contact,

nut at back end

23

of assembly,

.

,

TO REMOVE

(a)

(b)

(c) Remove dust

Remove music rack

it from console

Remove music rack base by

UPPER MANUAL (Mi

by unscrewing

cover over

M-2i

M-3)

taking out two screws

generator by taking our seven screws from

generator shelf and loosening four screws in cover just below upper

assembly

(d) Detach control panel by removing

panel on

-

generator, being

careful

panel wires need not be disconnected.

thumb screw,

unhooking brace, and lifting

in upper manual end

blocks.

edge of

manual

machine

6

screws

from

top of panel,

and lay

not to damage generator wiring. Control

(e)

Detach

pedal volume control (Figure

and loosening wood screw which holds friction clip to top of console;

control from drawbar and

generator wiring. Volume

(f)

Cg)

(h) Unsolder wires

(i) Remove upper manual

Remove two screws fastening matching

take off round cover

and black wire from transformer,

Re-attach matching

from lower manual drawbars.

3)

by removing two screws which hold it

unhook

lay

it on generator, being careful not

to damage

control wires need not be disconnected,

transformer bracket to upper manual,

held by two screws, unsolder and detach shielded wires

transformer to upper manual.

mounting bolts "A" and "B" under keyboard (Figure

33).

j

(

(k)

)

Remove the

Prop

up front of upper manual

two

careful when raising and lowering manual that its terminal

aged by rubbing lower manual

(1)

(m)

Unsolder manual cable from terminal strip.

Detach

to underside

vibrato line box by removing two screws in sides of

not to damage wiring

(early

(n) Where line box is of metal construction unsolder wires from scanner leaving

M-3

only)

upper manual

stop plates, held by two wood screws (Figure

so

that

its

terminal

strip is accessible.

strip is

not dam-

3).

Be

keys

Lower

of console top; lay line box on top of generator, being careful

on

generator. Line

box wires need not be unsoldered

manual

into normal

box

fastening it

position,

it attached to manual.

(o) Carefully lift manual assembly (including drawbars and matching transformer)

out through back of console,

(p) (q)

Remove metal

Take

lift

out 8 hexagonal head machine screws from drawbar assembly and carefully

off drawbar

angle fastened across keyboard by two screws.

assembly and matching transformer assembly.

M-lOO

(a)

(b) Remove four

Remove

music panel and top,

screws which secure metal cover on control panel assembly.

(c) Remove two large screws located

it to upper manual.

(d) Remove generator

dust cover by taking out seven screws from edge of gen-

erator shelf and loosening four

(e) Remove two manual hoId- down bolts located at ends

front generator corners

(f)

(g) Detach pedal volume control by

Remove two screws fastening matching transformer bracket

assembly.

Unhook

Volume control

wires need not be

control from drawbar and lay

- Reinstall dust cover temporarily,

at ends

screws in cover just below manual assembly,

removing two screws which

disconnected

of control assembly

it on generator

of

console

to upper

hold it to manual

which secure

directly above

manual,

"

cover.

(h) Remove

vibrato

line

box by taking out

upper manual.

(i) Remove screws holding

four screws attaching

four plastic clamps containing wiring.

24

it to rear of

,

.

) Locate nine coded wires coming from busbars inside manual,

C

j

found

preset

diagram

(k) (1)

(m) Reinsert

(n)

Co)

Take out four

Entire

and matching

Remove

Prop up front

at right rear of manual. Trace this troup of

tabs and

unsolder.

Note

location

and routing as shown

and in console-

hex head

control

panel,

transformer can now rest on

two bolts which held the control

two screws which

of upper manual

machine screws from

drawbar assembly.

drawbar assembly, line

generator cover.

assembly to the manual

pass through angle brackets into

so that

its

terminal strip is accessible.

box, pedal volume

wires to upper manual

Tehse

are

on wiring

control

assembly,

upper manual.

Be

careful

when raising

not damaged by rubbing

(p)

Unsolder

manual cable from

position-

(q)

TO

(a) Remove music

(b) Remove music rack base

REMOVE LOWER MANUAL (Mi

Carefully lift manual

t

rack by unscrewing thumb

it from

console.

and

lowering manual

lower manual keys-

terminal strip. Lower

assembly out of

M'2» M-3)

by taking out

two screws in upper manual end

that its terminal

manual into normal

console.

screw, unhooking brace,

strip is

and lifting

blocks.

(c) Remove dust

generator

assembly.

(d) Loosen

3) to top

Ce)

(f) Prop up

Remove

wood screw holding friction

upper manual mounting bolts

front of upper manual

and lowering upper

lower manual

(g)

Remove

two hexagonal head mounting bolts

cover over generator

by taking out seven screws from edge

shelf and loosening four screws

clip of

of

console,

as

"A" and "B" under keyboard. (Figure

far

as possible.

manual that its terminal

keys.

of

in cover just below upper manual

pedal

volume

Be

careful

control (Figure

33)

when raising

strip is not damaged by rugging

from rear end of lower manual

chassis mounting

(h) Remove

(i) Remove lower manual

keyboard

(j)

(k) Lift

Unsolder manual cable wires from

manual out through front of

three

(Figure

screws X, Y,

blocks.

33)

woodwork.

(a)

Remove

screws holding four plastic

Z under keyboard (Figure

end blocks by taking out

terminal strip,

console, being careful

M'lOO

clamps containing wires, on rear of

33).

screws C, D, E, and F under

not to

damage

upper manual.

(b) Locate nine coded wires

are found

manual

preset tabs and unsolder.

at right rear of manual. Trace this

wiring diagram and in console.

(c)

(d) Remove both

(e) Remove lower manual

(f)

Prop

upper manual from front, being careful

lower manual end blocks,

ual

frame

and one screw through bracket

Remove two hex

terminal cover, hedl by four screws under keyboard.

bolts which secure lower manual to case.

coming from busbars inside of lower manual-

group of wires to lower

Note location and routing as

does

not slip back.

screws through man-

by

it

removing two

in check block.

shown on

These

(g)

Loosen

front rail of case.

(h) Lif

(don't r^tnove) four hex

t out lower manual

screws holding front of lower manual to

25

,

.

TO

(a) Remove

DETACH AND OPEN

generator

dust

shelf and

CONTROL PANEL

cover over

ual assembly-

(b) Remove six machine

(c)

be

lowered

Lay box upside down on generator

and pulled

generator) and remove bottom cover

be taken not to

cedure. None of the wires or cables need be disconnected.

pull

generator by

loosening

screws

from

toward rear of console.

the wires

(Mi M-2» M-3)

taking out seven screws from edge

four screws in cover

top

of panel. Control

(being careful not to

by taking out four screws. Care should

or cables excessively during this pro-

just below upper

tablet box may

damage wiring

of

man-

now

on

TO DETACH A^a3 OPEN PERCUSSION

(a) Remove screws C and D

(b)

(c) Turn

Remove

four fastenings holding panel to wood

tablet assembly upside down and remove

under keyboard

two screws . Wires need not be

TO REMOVE

(a) Remove dust cover over generator by taking

of generator shelf and loosening four screws in

manual

GENERATOR <Mt M-2»

assembly,

CONTROL SWITCH (M-3 ONLY)

(Figure

disconnected

M-3j

M-IOO) FIRST PULL

33)

block.

bottom cover by taking

OUT

LINE

out seven screws from edge

PLUG

out

cover just below upper

(b) Unsolder, at line panel, six wires

and starting switches

(c) Unsolder, at

(d)

(e) Disconnect scanner shielded (f) Unsolder cable of six green

(g)

Unsolder

Unsolder scanner wires

pedal and manual cables from generator,

M^2, M-3) on

(h) Unsolder two black wires

and also grey wire (connected to

line panel, three wires to

wire from amplifier

wires from scanner terminals.

from terminals

vibrato line box.

from

generator

junction of two carbon

(5

wires on M, M-2, M-3) to

amplifier,

terminal.

3,

4,

and 5

(12, 13,

and

cover near start motor end,

resistors

running

14 on M,

on

generator

(i) Remove 4 generator hold down

and remove screws

) Unhook four suspension springs from generator.

(j

(k) Carefully lift out generator.

TO REMOVE STARTING

(a)

Remove dust cover over generator by taking

of generator shelf and loosening

cover)

MOTOR (Mt

on

M and M-2).

M-2>

manual assembly.

screws

(4

cotter pins from clamping

M-3i M-lOO) FIRST PULL OUT LINE

out seven screws from edge

four screws in cover just below upper

screws

PLUG

(b)

Remove oiling threads (tied to

pulling or cutting them, (When replacing

two motor bearings) from oil

threads be sure they go under

felt in trough)

(c)

Provide more slack in lead wires at

starting motor by pulling

carefully,

(d)

(e) Lift motor out and unsolder its lead wires-

TO REPLACE PILOT LIGHT (M-lOO ONLY)

Unscrew two hexagonal studs extending beyond

replace all

threads).

trough

wires

outer edge of motor.

(Be careful

to remove

by

and

(a) Remove music panel and top. (b) Remove four screws which

(c)

Lift fiber shield over

bulb and

secure metal cover on control

NOTE; Use No. 12GE 6.3V

panel assembly.

replace bulb.

.ISA Minature 2 pin.

26

,

TO

(a) (b)

(c)

(d)

(e)

REPLACE

Remove

Remove two

of

switcht^s

Remove

so it

that free

Remove

BROKEN

A

music

four

TAB

panel

screws

Phillips

CM- 100

and top,

which

screws

associated

lock

washer

just clears

end

of rod

from either

broken

remains of broken

ONLY)

secure

from

with tab

tab-

will clear

tab and

metal

front of

to be

cover on

control panel

replaced.

end of switch

It may

adjacent

be necessary

switch

insert new

control panel

assembly,

piece,

that hold bank

and pull rod out

to tilt

assembly,

assembly so

TO

(a)

(b)

TO

NOTE;

side

REMOVE

Unsolder

Remove

VIBRATO LINE

A small

of switch

wires from

two screws in

console top-

of upper

manual.

REMOVE PEDAL

bronze

assembly. Be

BOX (Mt

On later

KEYBOARD

spring

M-2i

line box

bottom

units,

(M,

M-2i-M-3i M-lOO)

washer will be

sure this is

M-3t

M-IQO)

terminals

edge

of

box

fastening

remove four

found

between tab and one

reinserted with new

underside of

screws

it to

fastening it to rear

tab.

(a)

(b)

(c)

(d)

Remove dust

of

manual

generator

assembly-

cover

shelf and

Unsolder pedal

Remove

Place

it when

(Figure

three

suitable

screws

3),

console over

pedal

and then

pedal

over generator

loosening

cable

from

generator.

keyboard twisted

wooden strips

are removed.

remove

keyboard.

by

taking out

four screws in

wires from

under pedal

First

three screws

remove two

seven

cover

amplifier

keyboard

screws in

on

lower shelf toward

screws from edge

just below

terminal panel,

assembly to

back of console

upper

support

front of

(e)

TO

(a)

(b)

NOTE: It may

latter

mentioned

Lift console

al

screws loose

REMOVE

keyboard

EXPRESSION

Disconnect

M, M-2)

Prop up

terminals

right end

be

necessary to

screws.

and

pull out

replace two

until remaining

PEDAL (M, M-2» M-3-

two

twisted wires from "SUS

"W" and

of console

remove two

keyboard and

screws in back

screws are

M-lOO)

"X''

on

at least 6

M-3) .

speakers to take

strips-

of

console first, leaving

replaced),

SW"

terminals on

inches from

(When

floor.

out these

re-installing ped-

these

amplifier, (Model

(c)

(d)

A

change in

Unhook coil

Remove

the stators

by following

600V)

tinued

between pin 1

noise free

spring

from

screw linking

all

of the

the

amplfiier coded ''H''

swell assembly-

steps below. The

of the 12AX7

operation

expression unit

expression

NOTE FOR M-3

end result

and the swell

of

earlier amplifiers.

unit on

and above

This can

arm.

amplifier

to expression

ONLY

removes the

be

incorporated in

will place a

stators-

positive

block-condenser

This

change will

pedal.

voltage from

earlier

amplifiers

(,02mfd-

insure con^

SEE

FIGURE 36A

STEP

#1

STEP t/2

RTEP

//3

STEP H

-

OF SERVICE

Move lower

Move

to

Move

Add C9 from

lower

lug

B-

lower lead

^L\NUAL

lead

of C16

leads of R33,

of R32,

lug C to

D.

from lug

R35, C16

Cl5 and

26A

B

to

and

blue

lug A,

green

Remove jumper,

lead from

lead (C15 from

^ ug

lug C

D to

lug C)

LOWER

MANUAL

CONTROL

TABLETS

DRAWBARS

DETACHABLE

MUSIC

RACK

UPPER

SWELL MANUAL

on

DIMENSIONS:

AC INPUT:

FRONT

VIEW OF

45-5/8"

103

WATTS

CONSOLE-MODEL

FIGURE

wide;

1

25-3/8"

(volume)

DEEP;

Expression

pecal

ORGAN

M

42"HIGH

OUTPUT:

WEIGhfT:

11 WATTS

249 LBS,

E^I.A.

27