SERVICE MANUAL

No. 1

SEE BURG SYMPHONOLAS

• 1941 Models

7800, 7880, 8800, 9800 .

•

J. P. SEEBURG CORPORATION , 1500 DAYTON STREET • CHIC A G 0, U. S. A. IL_

Pnntc ill U. S. A.

FOREWORD

This manual has been prepared to assist the service engineer in making any adjustments and repairs that may be necessary on 1941 Seeburg Symphonolas. In preparing this manual every effort was made to present the material in as simple a form as possible. Seeburg maintains a nationwide organization of field engineers to instruct and cooperate with your service

department. You will find these men up to date on all in formation pertaining to service. In addition, we maintain a home service department at the factory to help you and

to furnish you with any technical or service information you may desire.

When requesting information by wire or letter relative to the Symphonola, please give Model and Serial Number.

When ordering

to give the name of the a part, it is especially important part and the part number as well

as the Model and Serial Numbers of the Unit on which it is used.

Always give a full description of the problem at hand so that we may be better able to serve you.

TABLE OF CONTENTS

INSTALLATION	8

A. UNPACKING	8

B. CURRENT SUPPLY FOR INSTRUMENT	8

C. INSTRUCTIONS FOR INSTALLING RECORDS	8

D. NEEDLE	9

FUNCTIONS OF COMPONENTS IN SYSTEM	10

1. SYMPHONOLA A	10

A. COIN SWITCH ASSEMBLY	10

B. METHOD OF SELECTING TRAYS IN THE SYMPHONOLA CHASSIS	10

C. MOTOR MOUNTING	10

D. RECORD PLAYING INDICATOR DIAL	11

E. RECORD PREFERENCE METER	11

2. AMP L I F I E R S. . • • • • • • • • • ~ A . GENERAL • • . • • • • • • • • • • • . • ~ B • FUNCTIONS OF SOCKETS AND SWITCHES • • • • • • • ll c . FUSES ON AMPLIFIER. • • 5 3. ELECTRICAL SELECTOR • • • • • . • • 5 A. GENERAL . • • • • • • • • • 5 B • COIN OR CREDIT CIRCUIT. • • • • • • • 6 c. SELECTOR SWITCH • • . • . • 0 D • SERIES RELAY CIRCUIT. • • • • • 6 E . CANCEL SOLENO ID CIRCUIT • • • • • • • • • • • • • b F. INTERLOCKING CI RCU I T. • • • 7 G. INTERLOCKING RELAY. • • • • • • • • 7 H • NONCHEATING CIRCUIT. 7

Service Manual '41 Models 7800, 7850, 8800 and 9800

Page

I • ELECTR ICAL COUNTER • • • • • • • • • • • 7

J. CREDIT INDICATING CIRCUIT. • • • 8 1!. SOLENOID DRUM ASSEMBLY • . • . • 8

A. GENERAL. • • • • • • • • • • • • • • • • • • • • 8 B • SELECTIONS ON SOLENOIDS. • • • • • 8 c. CREDIT ON PINS • • • • • • • • • 8 D • COUNTER UNIT • . • • 9

OPERATION AND MAINTENANCE I • GENERAL. . • • • • • • • • • • • • • • • • I I A. APPEARANCE . • . • • • • • • • • • I I B • LUBRICATION. • • • • • • • • • • • • • . I I

2. TONE ARM • • • • • • • • • • • • • • • I I A. TONE ARM WEIGHT ADJUSTMENT . • . . . . . . • • I I B. PICKUP • • • • • • • • • • • • 12

3. SOUND EQUIPMENT. • • • • • • • • • • • • • • • • • 12 A. AMPLIFIER. • . • • • • • 12 B. VOLUME CONTROL • • . • • . • 12 c. TUBES. • • • • • • • • 12

D. SPEAKERS • • • • • • • • 12

1!. INSTRUCTIONS FOR INSTALLATION OF WIRED REMOTE SPEAKER. 13

5. ELECTRICAL S ELECTOR. • • • • • • • • • • • Ill

A. CREDIT MECHANISM • • • • II! B. SERIES RELAY • • • • • • • • . . • • • I ~ c. CANCEL SOLENOID. • • • • • • • . • • • • • II! D. INTERLOCKING SWITCH AND INTERLOCKING RELAY . • • • 15

Service Manual '41 Models 7800, 7850, 8800 and 9800

('

Page 6. SOLENOID DRUM ASSEMBLY, • • • • • • • • • • . • 15 A. ACCESS TO SOLENOID DRUM ASSEMBLY, • • • • • • • • . 15 8 • SELECTION SOL EHO I OS • • • • • • • • • • . I 5 c. MOTOR CONTROL RELAY • • • • • • • • • • • • • 16 D. ALIGH~1EN T OF REAR VERT I CAL HELIX. • • • • • • • 16 E. PIN CANCEL RELAY. • • • • • • • • • • • • 16 F, SELECTOR DISC AND STOP PIN ADJUSTMENT • • • . 17 G. SELECTOR SHAFT ADJUSTMENT • • • • • • . • . 17 H • COUNTER UNIT. • • • • • • • • • 17 I • COUNTER RELAY • • . • • • • • • • • • • • • 17

SERVICE NOTES

I , PROPER HUMBER OF CREDITS FAIL TO REGISTER IN THE MECHANICAL S ELECTOR. . • • • ; • • • • • . • . • • • • • • • • • 19 A. MAGAZINE RELAY DOES NOT RESPOND TO COIN • • • • • • • 19 B. TOO FEW PLAYS FOR THE AMOUNT OF COINS INSERTED. • • • 19 c. TOO MANY PLAYS FOR THE AMOUNT OF COINS INSERTED • . • 19 2. MOTOR FAILURE • • • • • • • • • • • . . • . . • . • • • • 19 A, MOTOR DOES NOT START. • • • • • • • . . • . . . 19 B • MOTOR DOES NOT START UNTIL COUPLING IS DISCONNECTED AND MOTOR IS SPUN WITH FINGERS. "' • • • • • • 19 c. STARTING WINDING CUTS IN AND OUT CONTINUOUSLY • 20 D. MOTOR FUSE BLOWS. • • • . • . • . . • • • • • • • 20

3. RECORD TRAY SELECTOR PULL! NG OUT TWO OR MORE TRAYS AT ONE Tl ME. . • • • • • • • • • • • • • . • . • • • • • • • 20 ~. TIMING OF MECHANICAL SELECTOR WITH REAR HEL I X • • • • • • 20 5. TURNTABLE DOES NOT FUNCTION PROPERLY. • • . • . . . 21

A. TURNTABL E FAILS TO RISE TO PLAYING POSITION • • • • • 2 1

Service Manual '41 Models 7800, 7850, 8800 and 9800

Page

B. TURNTABLE DOES NOT ROTATE WHEN IN PLAYING POSITION. , 21

6. 7. 8. 9. IMPROPER ADVANCE OF REAR HELl X, , • • • • • • •

A. SELECTOR MECHANISM BINDS, •• • • • • • •

B . FRONT HELIX PINS CAUGHT ON SELECTOR LEVER TOOTH , c. D.

• • 22 • • 22 • • 22 22 22 22 • 22 • 22 • • 23 • • 23 23 • • 23 23 • 23 • A. CONTACT PRESSURE. • ••••••• B. DEGREE OF CONTACT OPENING • • • C. TIMING OF MOTOR CARRY OVER SWITCH. 24 I 0. WARBLE OR TREMOLO EFFECTS IN THE MUS I C. 24 25 25 26 26

• . • . . . .

. . . ' • .

I I •

I 2.

13.

IMPROPER TIMING OF REAR HELIX •• , • • • • • • • HELIX LOCK ROLLER STOPS ON SPROCKET TOOTH • • CHANGING PLAY, MECHANISM • • • • • • NOT . SET • • IN OPERATION • • • • A. WORN OR DAMAGED STOP GROOVE AT END OF RECORD • • • •

• • • • • . • B. BINDING OF TONE ARM SUPPORT ROD • • c. INCORRECT CUTOFF ADJUSTMENTS • • • • • • • • • • D. BINDING OF TRANSMISSION WORM SHAFT. • • • • • • • E. BINDING OF TRIP LEVER • • • • • • • • • • • • • NEEDLE DOES NOT ENTER RECORD GROOVE PROPERLY,

A . B. ALl GNMENT OF .H EEDLE WITH EDGE OF RECORD

NEEDLE FAILS TO ENTER GROOVE. • • . • • • • • MOTOR CARRY OVER SWITCH ADJUSTMENT, • • • • • • •

SLOW RECORD START . . . . • • • • • • • • • • • • • • • ADJUSTMENT OF SYMPHONOLA SOUND EQUI PMEN'T ••• . . CLUTCH . . .. THROWOUT ... . . . LEVERS • • • • • •

• • A. SOUND EQUIPMENT APPARENTLY "DEAD'' •• • • • •

Service Manual '41 Models 7800, 7850, 8800 and 9800

B, c.

Page

DISTORTED TONE QUALITY.

• • 26 MOTOR HUM • • •

• 27 D. HUM DURING WARMUP PERIOD.

• • • • • 27 E. MICROPHONIC TUBES • • • • •

• • •

27

SELECTOR. • • • • • • • • • • • • • • • • • 27

A. CREDIT MAGNET DOES NOT RESPOND TO COIN. , , • • • • • B. COIN SWITCH CONTACTS NOT PROPERLY ADJUSTED. •

C. RATCHET WHEEL ESCAPEMENT LEVER TOO FAR FROM CREDIT MAGN ET • • , ••••••••• 0 0 0 0 0 I 0 0

D. RATCHET ESCAPEMENT LEVER ALLOWS TOO MANY PLAYS FOR

• • • • 14. PROPER NUMBER OF CREDITS FAIL TO REGISTER IN THE ELECTRICAL

27 28 28

COINS INSERTED •• , , , • • E. RATCHET WHEEL BINDING ••••• , • • • • ' . , . • . • .

28

I 5. ELECTRICAL SELECTOR MAKES NO RESPONSE WHEN BUTTONS ARE PRESSED • • • • • • , ••• , . .

A. B. GENERAL CAUSE • • • • • CREDIT SWITCH CONTACTS, • • • • • • • • • • .. . • . • . • . • •

•

C. INTERLOCKING RELAY CONTACTS • f 0 0 I 0 0 • • 16. CREDIT DOES NOT CANCEL ON ELECTRICAL A. SERIES RELAY CONTACTS • B. CREDIT CANCEL SOLENOID. SELECTOR • .. . • .. . . . . .

• • • • •

• • 17. C. D. RATCHET WHEEL ESCAPEMENT LEVER. 0 SOLENOID GUIDE STOP BRACKET ••• . I . 0 0 E. RATCHET WHEEL STOP BRACKET MOTOR TRICAL DOES SELECTOR. NOT START • WHEN • • A SELECTION • • INTERFERES • • • IS MADE • . ' ON THE • • •

. • • .. .

• • •

• ELEC • , A. GENERAL . •• • • . .

28 28 28 29 29 29 29 29 29 29 29 30 30

Service Manual '41 Models 7800, 7850, 8800 and 9800

Page B. SOLENOID PLUNGER DOES NOT PUSH UP . • • • • • 30 c. t.!OTOR CONTROL RELAY DOES NOT OPERATE PROPERLY 30

0. MOTOR CONTROL CIRCUIT ••• • • • • • • • • • • • • 30

18. SELECTIONS FAIL TO REGISTER ON SOL ENOl D 0 RUM ASSEMBLY. 31

I 9. ADJUSTMENTS OF 5¢10¢25¢ SLUG REJECTOR • • • 31

A • LEVELING. • • • • • • • • • • • • • • • • 31

B • 25¢ ADJUSTMENT, • • • • • • • • • 31 c. I 0¢ ADJUSTMENT. • • • • . 31

D. MISCELLANEOUS • • • • 31

CIRCUIT DIAGRAMS AND DRAWINGS AND PARTS PRICE LIST F i g. I Cabinet Wiring Diagram for Models 8800 and 9800. • ' 33 ) Fig, 2 Cabinet Wiring Diagram for ~lode I 78 50' ' • • 34 F i g, 3 Cabinet Wiring Diagram for Mode I 7800. ' • • • 35 F i g, lj Symphonol a Chassis Rear View (Cutaway) • . • • 36,37 F i g, 5 Front View of Mechanical Symp hono 1 a Chassis. • • 38,39 F i g, 6 Symphonola Chassis Rear View • • • • • • • • • . llO,Ill F i g. 7 Symphonol a Chassis End View. . . . . . • . 44,45 Fig. 8 Symp honola Ch assis Front View. • • • . • • • • • • 47 Fig, 9 S ch em at i c Diagram for Type 82510 Amp 1 i f i e r. • • • • • 48 F i g. 10 Front View of Type 8 25I 0 Amplifier. • • ' • • ' • ' 50 Fig, I I Bottom View of Type 8 25I 0 Amp 1 if i er • • . • • ' . 51 F i g. 12 Schematic Diagram for Type 8255 Amplifier • . 52 F i g. 13 Front View of Type 8255 Amp I if i er • • . . 54 F i g. I 4 Bottom View of Type 8 255 Amp 1 i f i er. . • • 55 Fig, 15 Schematic Diagram for Type 6 I 53 Amplifier 56 F i g, 16 Front View of Type 6153 A:nplifier • • • • • • • • 58 F i g. 17 Bottom View of Type 6 I 53 Amplifier. ••• • • • • • 59 Fig. 18 Schematic Diagram Electrical Selector Type B • 60 F i g. 19 Schematic Diagram Electrical Selector Type c 6 I F i g. 20 Schematic Diagram Series Relay (Selection) Circuit 62 F i g. 21 Schematic D i a gram Credit Circuit . . • • • • • • • 63 Fig, 22 Electrical Selector Type ES5Z •• ,, • • • • • • • • 61l F i g. 23 Switch Assembly Type SA6 Z • ' • . • • • • • • • • • 65 F i g. 24 Relay Box Type ,RB6 Z • . • . . . . . . • . . • 66 F i g • 25 Solenoid Drum Ass emb 1 y Type SD207Z {Top View) . • 67 F i g, 26 Solenoid Drum Assembly Type SD207Z (Bottom View). • • 68 F i g, 27 Schematic Diagram Motor Control Ci rcuit. • • • • 69 Fig, 28 Schema t i c Diagram Solenoid Or um Type S0207Z • . . • 70

Service Manual '41 Models 7800, 7850, 8800 and 9800 c

Page F i g. 29 Coin Mechanism Ass em b 1 y. .. 7 1 F i g. 30 s 1 u g Rejector . • . . • • • • • • • • 72 F i g. 31 Coin Tripper Assembly. • • • • • • . • • • • 73 F i g, 32 ~to de 1 7800 Cabinet Front View. . . • • • • 711 Fi g . 33 Mode 1 7800 Cabinet (Front View) Door Qp en. • • • • • 75 F i g. 311 No del 7800 Cabinet (Rear View) • • • • . • • • • • 76 Fig. 35 ~to del 7850 Cabinet (Front View). . • . • • • • • 77 Fi g. 36 Mode 1 7850 Cabinet (Front Vi ew) Door Open. 7S F i g, 37 Model 7850 Cabinet (Rear Vi ew) • . • 79 F i g, 38 ~lode 1 8800 Cabinet (Front View), • . • • 80 F i g. 39 t~ode l 9800 Cabinet (Front View). . . 81 Fig, 110 HiTone Cabinet Assemb.l y (Rear View) . . 82 F i g. Il l HiTone Cabinet A6cessories (Upper Rear View), • 83 F i g, 112 HiTone Cabinet Accessories (Lower Rear View), • • • • 84 F i g. 43 HiTone Cabinet Accessories (Front Door Open), • • 85 Fig. 411 Front Door Light ing Assembly . . . . • . . . . 86

c

r

INSTALLATION

A. UNPACKING

We advise that the packing case be carefully examined before unboxing the instrument , and

should there be any indication of conceal ed damages, the transportation company should be notified. When unpacking we advise the following procedure:

1.	Remove the screws holding the back of the case to the sides.

2.	Carefully remove the instrument from the packing box

3.	Open the doors in the back by means of the keys which are contained in cloth bag tacked on the back.

4.	Remove the fastening from the tone arm to the tone arm post bracket.

5.	Remove the shipping block holding the record t rays, and the shipping brace and wooden block which hold the motor rigidly for transportation purposes. It is advisable to keep these braces in the bottom of t he instrument and use them again when transporting the machine.

6.	Remove the two wood screws and blocks holding the brackets on the bottom of the record changer mechanism.

7.	Remove the four wing nuts in each corner of the chassis. NOTE : The wing nuts should be removed so that the chassis may be resiliently suspended in the spring mounting . This is absolutely essential in order that the best tone quality may be obtained. \Vhen the instrument is again to be moved, these wing nuts should be replaced and tightened down so that they hold the chassis rigidly.

B. CURRENT SUPPLY FOR INSTRUMENT

On the back of each instrument will be found a name pl ate which gives the type of current

upon which the instrument is designed to operate. If in doubt as to whether or not the type of

current at the location is correct, look at the house watt meter or call the local power company for this information.

C. INSTRUCTIONS FOR INSTALLING RECORDS

A set of record support discs will be found fastened inside of the cabinet. One disc should be used as a support underneath each record. It is not necessary to remove the record support discs from the t rays when records are being changed, but it is important to make certain that both the discs and records are centered properly in the record trays.

When installing or replacing the records in the instrument, it is best to install or replace

the record in No. 20 tray first. Install or change the balance of the records starting with No . 1

tray and work down through the stack of record trays until all the records are in their respective

t rays. As each record is put in its tray the title for that pa rticular record should be put in its proper place in the program holder .

After al l trays have been filled they must be returned to their original position by hand

excepting No. 20 which should remain over the turntable.

D. NEEDLE

The Symphonola Pickup is designed to use any standard phonograph needle, however, we recommend the type supplied with the instrument. The needle should be installed having the flat part of the needle aligned parallel to the grooves in the record.

FUNCTIONS OF COMPONENTS IN SYSTEM

mend signed instrument. installed graph the the needle grooves The the needle, to Symphonola type use having aligned in The however, any supplied the needle the standard record.

parallel Pickup flat with we should recom part is phono the to de be of •

1. SYMPHONOLA A

A. COIN SWITCH ASSEMBLY

Wben a 25¢ coin enters the runway of the coi n switch assembly (Fig. 29-B) it successively

moves the levers of t he coin switches Nos. 1, 2, 3, 4 and 5 downward, making a single contact

for each lever moved. Each contact made should store a play in the play magazine.

Fig. 29-A is a front view of the coin switch assembly showing the 5¢ and 10¢ runway. When a 5¢ coin enters, it travels down the right hand runway, moving the lever on No. 4 coin switch downward, making a single contact. This should store one play in the play magazine.

When a 10¢ coin enters, it travels down the left hand runway moving No. l and No. 5 coin

switch levers downward, making two contacts. This should store two plays in the play magazine.

B. METHOD OF SELECTING TRAYS IN THE SYMPHONOLA CHASSIS

When a selection is made one tray only should be pulled out at a time , The trays are withdrawn

by means of the selector slide pawls (Fig. 6H, No. 1183) of which there are twenty. One of these slide pawls engages a lug on a tray (No. 1110) when one of the rollers (No . 1223) of the Helix (No. 3201) push against the selector slide pawl spring (No. 1184) t hereby movi ng the pawl (No.

1183) inward, as shown in Fig. 6B.

The selector pawls (Fig. 6H, No . 1183) are urged inward at all times by the action of the selector pawl s prings (No. 1184) .

But when the selector slide (No. 1180) is in position with the selector pawls opposite the lugs

as shown in Fig. 6G, t hen the action of the selector pawl lift springs (No. 1113) is stronger

and overcomes the pressure of the selector pawl springs (No. 1184) and prevents the selector pawls from engaging the lugs on the trays (Fig. 6G). That is, with the exception of that particular

pawl which is pressed in through the action of the helix roller against the selector pawl spring

(Fi g. 6H, No. 1184) .

C. MOTOR MOUNTING

The motor is resiliently mounted on steel springs (No . 1841 as shown in Fig. 5A) in

order to prevent vibration from the motor being transmitted through the chassis and reaching

the pickup.

D. RECORD PLAYING INDICATOR DIAL

The "record playing" indicator dial is located just back of the cabinet escutcheon and is

illuminated by the same lamps that illuminate the program holder. It is timed with the selector in such a manner that is always indicates the number being played. On the hi - tone models 8800 and 9800 a single lamp illuminates both the record playing dial, the credit dial and the front vertical plastic.

E. RECORD PREFERENCE METER

A play meter indicating the number of plays obtained from each record i s conveniently located

and attached underneath the front shelf below the tone arm post. An individual dial for each record turns one notch clockwise as its corresponding record comes to playing position.

A reading can be taken by first allowing the Symphonola to come to a stop after it has

played No. 20-record, then lifting the cabinet lid and looking at the individual escutcheon

dials under the. shelf. To reset the dials, turn them count counterclockwise by hand until they

reach the stop position. On models 8800 and 9800 it will be necessary to open the front door

and turn on light by means of switch on right side of cabinet before play meter can be read.

2. AMPLIFIERS (P13)

number front each post. each cated record A record and shelf An of play attached plays J.ndividual below turns meter is conveniently obtained indicating one the underneath dial notch

tone from for arm lo the the

Service Manual '41 Models 7800, 7850, 8800 and 9800

first at dials come ing record played clockwise tion. the the to under allowing No. A comes individual cabinet a reading stop as 20record, the. to its after the shelf. lid playing can corre~ponding escutcheon Symphonola and it be tnen has To looking posi taken reset

lift by to 1nodels and reach necessary before clockwise switch the dials, turn the on 8800 playmeter on by to right stop turn and light open hand position. 9800 side them can until the by means be of counter it front cab:Lnet they will read. On of door be Z. AMP l I F I E R S

A. GENERAL

Symphonola duces located amplifier which in can ing power record. to plug the tion various the wrong best the and of The for no the cabinet functions on power be Tbe amplifier socket plug all panel. sound socket. units is the taken power from equipment can the front and arrangement recorded by of be up source also The in is the means of by each put supplied the distribu amplifier describ located repro the of on into 1941 of socket a in a B. SWITCHES FUNCTIONS OF SOCKETS AND operative. Fig. When posi is is the the the supplied ready Symphonola main up tlon, 14, The this position, power Item ror switch switch the \vi and operation. 1; Symphonola th is to (Fig. the is Fig, the standby all controlled in instrument s~ri 11, 17, units the tch is power Item Item dovm in in in by 1; 1). Item electr ical Item uted solenoid coils socket the 25 3 3} Tne to on volts also Fig. the supplies drum octal the selector. various has 13, supply solenoid from socket two Item 25 which relays lugs volts j,s drum Th 3; (Fig. distrib i s Fig. point which

to and and 10, the 16, on are carry amplifier are socket operate the the motor connected closed. the solenoid provides the when control power counter In to these addition, drum. the to the relay the unit power contacts contacts motor and located this to they and of M22; mitter Item sockets is Item the be the 1"!22; Fig. are any solenoid contact plugs receives type the another It 2J seen schema power 2) when . Fig. wired fig. narm can 13, output T32 Fig. socket (Fig. vtill that the drum resulting. Item 15, be This in transmitter to tic 12, octal to one R.F. 13, be parallel a interchanged these 1; diagrams 9, and Items the Items socket type (Fig. noted is Fig. I Items socket AC output tem transmitter used. two T3Z M18 10, M21 The 16, and line. 2; supplies so that M21 octal it (Fig. and from Fig. Item small trans that carries l''rom without Item and will there and 1{19) 1; 10, a the 16, 1) 4 F!g. Fig. rnotor equipment Symphonola. contacts 10, power (Fig. rtem 16, The 16~ 10, for when 9 4; Item Item are Item any that contact the Fig. The closed. remote 4) 5) may motor 5; 13, supplieS 2 is Fig. be socket contact the control Item control added 13, source 4; power (Fig. outlet Item to relay of the 5; to

Service Manual '41 Models 7800, 7850, 8800 and 9800

lights pilaster is electrical and Item socket (Fig. in 9800 7) The 11, the are (Fig. supplies lights Symphonolas. small "onItem on selector 10, 11 when l; 2 position. on contact 6 Item Fig. volts the the and 7; Model 14, These main upper Fig. for polarized Item switch 8800 the 13, l) and Fig. all ously. are control closed. F1g. The middle 10, 16, controlled swi ing switc.h (Fig. lights (Fig. to transformer the tch lights 7850 off transformer t~em Item power 17, The 2, 16, 11, is in are position, primary With relay Item at also Item The 1 6? 6) in Item Item to the energized all on by contact Fig. supplies (Fig. 17; the 4 this the only supplies 2). up contacts the contact 6) 2; times. of are do1m switch Fig. the pos'ltion, 13, Fig. on 1, light the transformer when v.'hen socket on Models above 117 Item Item by l 3, position, 117 are With socket 14, ighting continu the switch this the in volts Item 17; 6; (Fig. volts

lights Item the these 7800 motor the light Fig. 13)., is 2; lights to switch the the "on" are program {Fig. position.

on 17, as lights. long Item 1) as These the is in main supplies magnet (Fig. The 16, through 25 small Item volts 7) 5 the contact on to coin Model the switches. magazine socket 7800 C. FUSES ON P~PLIFIER

16, fuse Fig. Item 13, cartridge Items The Item with 16; cles the Item sc~ ew tamperable phonola tant Fig.13, Item covez'ed !~em fuse 13, 14; 17; There 16) (Fig. (Fig. one that 14 type motor. 15; Items 14) and Fig. Fig. of (Fig. is a type 10, are socket type 10, receptacle blown a the is It;em 16) Fig. 13, 16, 21/2 10, light I Item 14 two fuse It a correct terns on 16, 16; Item 2l/2 Item and fuse (Fig. fuse Item is 17; ampere the 14 fuse. for 16; Item Fig. very 17) 14; be (Fig. Fig. ampere value. 15; 10, and amplifier. recepta tbe Fig. replaced Fig. 15) 16, in non impor Fig. The 16; I 16l 10, in 13, tem the Sym 3. ELECTRICAL SELECTOR

A. GENERAL

selector cal selector parts manual. volts. device ing the supplements selector; the tions the Symphonola operating Electrical in to The are are the located mechanical The which One Electrical which discussed made. it 1940 other the is is voltage has Selector on at is mechanical an selector the Two almost arrangement is the which the electrical Selector in type models the is front same

this differ selec E except 25 identi type of of C of Cable. connect 23) electrical it (F ig. the the consists SA62 and type 24) ed the B Swi by characteristics out RB6Z of means which tcb differs two Assembly Relay are of comoonents a in inter Selector Box tbat (Fig. as Solenoid desired ~unctions works trol phonola the electrical The the in Chassis selection. Electrical Drum rear conjunction of the helix (Fig. selector and mechanism 25) The Selector of effect with the are primary to the Sym in con the (l)

Service Manual '41 Models 7800, 7850, 8800 and 9800

on cancel selection the there seleccor selections to only. mistreatment selector ~ions prevent parts establish the electrical designed are performed solenoid the cheattng mechani wl:ich some is credit to or made. credit and selector are secondary for drum overloading s in and m, established es~ablish momentary necessary the In in (2) and possible electrical addition, the when convey func (3) of them duty a to to in B The unchanged entirely nents reference will the pllfy sel circuits explanaL.ions ec T~e be the in t discussed or function the to will following to operation. the analysis electrical involved. be Type may made of by discussion, C considering be the of almost selector. To applied selector compo the sim Typ B. COIN OR CREDIT CIRCUIT

M4) lever allows wheel establish contacts sembly, erated equivalent wheel ra (Fig. the Junction time l:chet Symphonola of a The 24, (Fig. (Fig. Lo one by coln the wheel the Coin escape, with i~ credit ohe I~em Electrical to tooth closes 24, the ratchet 24, Switch credit one the through 17; operates Coin Item I~em on on rotati~g credit tooth.

Fig. one escapement the the 13) Switch 9). Assembly magnet Selector an of ratchet 19, ratchet in magnet is angle Each the the con As op and Item in to C. SF.LECTOR S\•!ITCH

excite the structed tion operator '"he desired. two selector that selection to i It ~ make Ls is swi~ches impossible solenoids so the con selec "Oeri:lit at to 6

open cussed. A portance plained cel circuit circuit circuit electrical noid permits ments butters once. circuits a1'e circuit circuit is (Fig. matic to relationship pens. switches study function pressed. sol the when drum 19) diagram is The There enoid are of as red as is ~s ~s is the of such as through when two will other selector not comoleted closed completed. the purpose labeled. after pushed th circuit interlocking shown has are of The or that ls (Fig. Schematic closed show a the more will operated. parts selector black two the on the before and the simultaneously. are ho1v 19) and switch to fundamental selector the The credit but be selector of circuit black The the j dis this the the ex Diagram Sche red relay these the is button the red im seg The sole black left red hap can D. SERIBS RELhY CIRCUIT

on Switch. drum. are corresponding circuit est contacts 24, pushes is is series tacts through completed, pushed the Item closed the vlhen of a circuit solenoid contacts front the v.'hen close 24; selector the up <;he and series Fig. on credit of the credit selection the and the ls drum. che are the 19, completed series series button, a relay customer solenoid switch Credit selector those switch I The tem solenoid relay circuit to the M3) near credit (Fig. con the pin F. CANC~L SOLENOID CIRCUIT

19, is solenoid completed Item Yne Ml) cancel (Fig when through . 24, solenoid the Item tne large 2; cancel circuit Fig. con

(

Service Manual '41 Models 7800, 7850, 8800 and 9800

even switch interlocking open close switch through or After though and contacts operates, maintairling the maintain Lhe the interlocking relay, interlocking interlocking open. operating the contacts the circuit normally relay the However, ~~other normal can relay contacts circuit canceling energized; interlocking gized relay the their (Fig. SllfitCh selector be cancel When normal must 19, and then made, position opens. selection through before o~erate button Item solenoid the the first drops solenoid and the relay position starting normally Ml). As the another allowing is the interlocking return out, they to long held will interlocking ts will series be The ready de break the relay as closed made. down, selection be to the be series credit the its ener relay in for the and the 7

insure circuit close cuit cuit cellation cheating directly by The Item begins momentarily, by relay button ulated, nas lightly, selector. 30 interlocking some series series switch. sufficient solenoid series tacts travel is the the the ohm way included tapping initial circuit period been series 1•18) In is until time on and long Candohm circui of functioning relay, through relay selector to broken is order contact . This circuit plunger a included. the to after of permit the travel noncheating relay When broken. of enough This the the to motion the is in energizing credit. circuit series small t the noncheating current operate time to in interlocking at the reststor selector is the energy circuit switch the the gap and is current pr'event backward, when series completed left the to during electrical series of of contacts A It energized. series If push relay is cause connects To selector pulse the the (Fig. the the hand is closes source. the buttons increases broken circuit the (Fig. further with to cheating button will manip cancel which relay non push series. cir a relay the 19) con cir is can on 19, the I. ELECTRICAL COUNTER

cuit tion tion (Fig. of of consisting To 26J maintain the the Item last electrical 7) of credit, proper on a cancella resistor counter opera a cir

cuit tion tion (Fig. of of consisting To 26J maintain the the Item last electrical 7) of credit, proper on a cancella resistor counter opera a cir

ratchet credit The the tacts cpncel series of to wheel. the be solenoid relay series cancelled thus relay permitting energizes from close. the a F. I NTERLOCKING CIRCUIT

19, of cuit of lo.cking which cuit one cancel stroke, pressed, the through maintaining the of selector Item When and (Fig. opens solenoid interlocking the i relay the M6) locks the t a 19) switch closes major selector the operating interlocking switch. {Fig. itself contacts. is has seri.es closeu seglnents portion the 19, switch travelled button 1\fter contacts up the relay Item by through cir of of inter (Fig, means is the 717) its cir , G. I NTERLOCKING RELAY

not he This series from firSt make means the relay selec~or another removes that circuit the his selection button. operator fingers to close. until can H. NONCHEATING ClRCOIT

insure circuit close cuit cuit cellation cheating directly by The Item begins momentarily, by relay button ulated, nas lightly, selector. 30 interlocking some series series switch. sufficient solenoid series tacts travel is the the the ohm way included tapping initial circuit period been series 1•18) In is until time on and long Candohm circui of functioning relay, through relay selector to broken is order contact . This circuit plunger a included. the to after of permit the travel noncheating relay When broken. of enough This the the to motion the is in energizing credit. circuit series small t the noncheating current operate time to in interlocking at the reststor selector is the energy circuit switch the the gap and is current pr'event backward, when series completed left the to during electrical series of of contacts A It energized. series If push relay is cause connects To selector pulse the the (Fig. the the hand is closes source. the buttons increases broken circuit the (Fig. further with to cheating button will manip cancel which relay non push series. cir a relay the 19) con cir is can on 19, the I. ELECTRICAL COUNTER

Service Manual '41 Models 7800, 7850, 8800 a,nd 9800

Credit merely rent Its energy lay 19) tact (Fig. function break. (Fig. set through 19, Switch a pulse means C 26, Item (Fig. The the is through contacts Item M9) of register to circuit. 19) limiting 8) and prolong is counter when D the used. (Fig. is con cur the re J. CREDIT INDICATING CIRCUIT

means wheel is indicated The of in credit the the Electrical credit to on the the customer indicating

ratchet Selector by dial dial front light. window make. credit selections and The ble until is orinted is (Fig. escutcheon The in illuminated i n visible credit the terms 22, printing the i.nstructions front customer Item of through explain is with the 34). escutch.eon. is established number not may white the on this This visi the small of a on Item credit the The 53). indicating light type B switch selector lamps which (Fig. includes turns 22, II, SOLENOID DRUM ASSH~BL Y

A. GENERAL

The vidual as provided phonola stores simultaneously. vdth the the taken (Fig. (Fig. they Symphonola Solenoid component The the 25) up 22 functions both Chassis. are Electrical by Sol or to works selections Fig. cancel a played enoid Drum study parts Chassis in l•1eans performed. 23 Drum assembly The off conjunction from Selector and can of Assembly (Fig. 24) and 40). function and i selections the the s best also credit indi Sym be of B. SELECTIONS ON 80LENOIDS

disc Drum Ml) 10). of one and 40, solenoid. solenoid selector (Fig. the current Electrical Item of and selector When J1ssembly (Fig. 25, The the pushes drum 7) stop coupling Item a The 25, selector travels which selection stop has pin (Fig. Selector, rotating 11; Item up a pin engages (Fig. the Fig. shaft to 8) stop 25) solenoids of the plunger is on 25, sel through 28, a couples made (Fig. that Sole the the pulse ector Item Item in 8

Chassis closed cancel responding posi~ion selected, switch is the the the pushed rotating rear proper relay and (Fig. and by helix dovm the record record the means selects 25, selector (Fig. selection of selector to Item its of the tray. tray 25, the the Sl~phonola 16) disc original has Item corre cancel stop After pin is been to 6), pin C. CREDIT ON PINS

noid motor on and Item cuit pushed Item is tact the made the the lower When 12). 12). spring plunger (Fig. control up, solenoid between grooved nortion a This 27) credit solenoid (Fig. assembly relay operating drum. completes metal the is of 25, (Fig. plu_~ger established plunger the contact Item (Fig. Contact the sole 27, a is 13) con on cir 25, until ate contacts pin (Fig. is the The after 27, up Symphonola close motor and Item the do whe11 12) control last not motor. contacts a open selection selector relay again These oper

,1

Service Manual '41 Models 7800, 7850, 8800 and 9800

Chassis, has 17; fore on has has playing relay selector carryover tion. the Fig. been returned been the energized The rear position, 27, keeps record played. played pin switch solenoid of are Item to the the has until its and pushed F12) but (Fig. Symphonola motor moved the lowest plunger the the located down 25, turntable control motor record to posi and Item be the D. COUNTER UNIT

box. SD207Z operates selector trically twice, is made The If the is from one Solenoid operated every or equipped counter from either number time a counter Drum will remote a is with the selection selected type register electrical an control that elec 9

every two travels tor solenoids. selections. time through a selecting any It operates of pulse the selec is vent unit, wire to panel inside side panel, visable open sealed of seal The tampering without the and the the through the counter , with sub Solenoid making only Solenoid sub panel breaking a with panel. the the small unit it the Drum numerals window bottom Drum impossible is lead the To counter located sub sub in seal. pre plate and are the of showing laneous a ing Schematic the its Fig. Solenoid its electrical parts No. Wiring assembly and 25 Drum is Fig. diagram circuits. a SD207Z and photograph No. miscel 27 show is

OPERATION AND MAINTENANCE

I.

A. APPEARANCE

of all earni maintained. be general strument, pearance priate title to made. good the times. ngs. It slips attractiveness for quality upkeep is of Typewritten but important ~he should Thts the A increases and location careful records inscrument not be the only that or of used good sel ! appro should printed the ts adds ection the at be ap in B. LUBRICATION

using friction viscosity high Oil speed an automobile points, the of transmission SAE10. gears such occasionally oil Oil as having bearings

the all a GENERAL

in and SLIDE QUICKLY VASELINE THE oiled carriers ity mi~sion body the They with ordinary on sticky. recommend transmission grooves and plates tion. the the SELECTOR lubricating reoil record the should a to GROOVES sparingly The light on slide turntable CAUSING bearings become selector retain OB light If become the this carrier slide sparingly. .ANY grease be SLIDE grooves grade shaft, AS toothed washed oil sewing gritty proper GREASE A oil. binding should I has feed grooves shaft, HEAVY T has PLATE.

of may inasmuch ~IILL or or not Wipe or machine clu Lch lubrica rack. thoroughly good DO I been bind. the the N LOAD or the the GUN enough may gummy, NOT THE qual clean trans record as used ON \ve UP be USE oil 2. TONE ARM

A. TONE ARM \'lEIGHT ADJUSTMENT

ly the the the 3.5 needle record tone On ounces. Model arm should just at 7800 barely the be the needle approximate clearing weight with of 9800, should the weight On Which be 2.5 Models when use ounces. 7850, t tested one 8800 arm as F3110, and above in of opposite of the Fig. the the needle When record. scale 5, the using is the needle should leaving indicator the weight be screw the directly pointer grooves just scale as while If the a weight instrument test is is playing,

made J I

it the the is needle grooves. easy starts to determine lifting just out when of weight r ecord. It tests is best near to the make start all of a weight ing the to weight. decrease the tone On may Model flat arm be or upward spring 7800 obtained increase correct underneath or dovmward by the bend imate 9800 obtained out in (located to to On the decrease center increase Models correct by in turning the of 7850, the the the top weight weight, and weight. the tone 8800 may approx screw arm) and and be

Service Manual '41 Models 7800, 7850, 8800 and 9800

B. PICKUP

fective, a the changeably 8). and factory entire F3126) When Two it types rebuilt the un:l in is are t pickup the recommended of be used pickup. pickups tone returned becomes inter arm (F3121 that (Fig. for de tific The device. pickup Its unit characteris

is a scien used. nominal damping Such able factory ments be struction reduce tics obtained a quality are which unit To its and charge. rebuilt determined dismantle and magnetism, introduce on cannot will and the exchange pickup be inferioz materials be of by the maladjust change corrected. question which its for unit to con a will the a can 3. SOUHO EQUIPMEHT

A. AMPLIFIER

high paired. designed Item quency other quality of used Item used because of or amplifiers quencies should tone too set to tor music full bad the great by (Fig. for 21; notes 19; compensators; for The (Fig. or l94l.model be the tone and output by will to Fig modifying Fig. modifying amnlifiers or used 10, an treble or control are subduing faithful 10, operate quality. bass . extent, be 16, 16, Item the equipped in without Item notes notes. greatly Item Item low Symphonolas adjusting from one 19; the the at either used 21; the reproduction All notes 19) distortion and lower Fi high 21) any compensa with very Care Fig. in g. tone lm the volume ls is the the 13, all fre these to dual fre low 13, are B. VOLUME CONTROL

11, 17, should slightly the to a Item Item back high It' cause the 3~ 3) of and level , Fig. volume the which the then when amplifier 14, volume go control is down Item turned located to 3; panel, (Fig. jump Fig. on again

I 2

control when be replaced. turned is defective sligh;;ly farther, and should the C. TUBES

Each on its each must number its the ing the to tact. do the number proper tube. socket tubes, When tube be tube so on tube paid may is must each installing ' lake on to special ~ube must result firmly to the make tube. be certa.i.n socket; the correspond inserted tube proper attention designated in pushed or The damage socket. failure replac that con number in into to to D. SPEAKERS

4? for and full which without rattle music. 4 are erate taken the J Fig. used are designed speakers that volume The not make with or 2, built in injury. speakers particular bad to up each Item the of as allow and reproduction the to other the 4; model this Care matched wittstand sound (Fig. dirt amplifier Fig. instrument may components Symphonola should 3, equipment 1, to cause to of enter Item the Item op be a

r (

Service Manual '41 Models 7800, 7850, 8800 and 9800

~. INSTRUCTIONS OF WIRED REMOTE FOR SPEAKER INSTALLATION 1941 be speaker speaker olas. the three connected remote Symphonolas. These speakers, volume in instructions speaker the to Symphonola, control incl~ding these and A total Symphon box the concern the for of may mou..Dted moved hand of control 8800 and on 61/2" for purposes viewing rear) mechanism tra phonola plate the the the the speaker 7850, control access speaker The and wall and with which amplifier right below on key from the only. 9800. speaker mounted it mounting (when the to the cabi.net Symphonola 27/8covers key control hand should the the the inside control It On must viewing control shelf 11 rear) top on control wall Models from should shelf. the for be box. of be the of from with mounted key hole on (when packing the the removed the box bottom the be l~od 7800 key A Syrn left for the the ex re is el of s control mote cedure When speaker, is box connecting advised: for the use following with the speaker the pro re 1. Remove Fig. 16, amplifier. plug Item 13, (Fig. the 10) Item 10, green from 10; Item dummy Fig, the 10; 2. Insert into the speaker either the plug control one from of the

box 13

ll sockets two I Items terns and 7prong 11 11 12; (Fi and and Fig. g. speaker 12; 12). 10, 13, Fig. I tems 16, 3. Insert either 7prong control remote speaker one the box. sockets of plug the into from in the the 4. Se~ TOTAL 13; speaker correspond in ing Item use. Fig. the panel 13; number link impedance Fig. 16, (Fig. with on of Item 13, 10, speakers the the match 13) Item to amount speaker control clockwise control clockwi greatest ergy external ly the the remote the tion, position the Symphonola control key There reaching turning of speakers same. se control ls is switch amount from speakers speaker position, posit are in turned is in the the the control six speaker. ion, in of receive box. a the full energy left, Syrnphonola is to clockwise energy. positions the the approximate the vllien third counter in greatest external the the When reaches full the the When posi en on and the Flg. i level volume s used 14, The desired. control to regular Item set 3; the (Fig. Fig. instrument overall 11, 17, Item Item volume 3; 3)

Service Manual '41 Models 7800. 7850, 8800 and 9800

5. ELECTRICAL SELECTOR

A. CREDIT MECHANISK

or 24, sistance Item ratchet this the tive. 21 credit I 17) is The t ohms em not escapement of which 13) credit magnet for 10.5 the should operates two magnet true ohms ~ay lever coils; have resistance, be per (Fig. the defec a (Fig. coil if re 24, This credit lever by The has mately 16) engage l/32n such of sure escapement wheel which ment with place. the the the stop the the loosening the relative and lower escapement credit ratchet ratchet just The cancellation bracket will an st~p . the hold should (Fig. ~agnet l escapement the /32 Adjustment The angle tightening escapement escaped bracket bracket help edge magnet lever 11 tooth the 24, ratchet wheel escapement • be should the posi~ion that to of lever ratchet prevent Item such of will at two the by lever of the pole tooth (Fig. 1t can them approxi be escapement lever the the 9) escapement credit. that is screws clear of strikes lever. face, be escape bent lever bouncing against 24, which at again ratchet proper ~d the made when should least Item at in the at on on It~ (Fig. tacts tacts .030" the the M3) When of 24, when stould ratchet ratchet should the credit Ite~ there credit open wheel 24; wheel. close. is is about Fig. no established switch the credit 19,

The .020" con con to I~

B. SERIES RELAY

Series Relay lowance doubleLr~o~ bet~een located sets . 030" of The The . Box Relay contacts. on The on .015" relay series is the the • arc should contact the and contacts left (Fig. relay gap series .025". The of be side 24, should has wear ~he

.020of relay. of Item two 11 the al be the to 1) necessary make of and at contact same justing the the the Both the time, series same wear armature the contacts normally to should time. moving allowance secure n lay stop. close be open contact Adjustments shoulo the made or at proper contac~s by to blade close the ad C. Ct~CEL SOLENOID

a 1:. 24, by selectioL c:eC.it means Itec The cancel 2) from of operates is the the made solenoid engaging ratche;; and each cancels

pawl. (Fig. ~iheel tiee next. The entire f escapement capement lever of I plunger ratchet ratchet • the ar 010t.em the enough proper 1solenoid ' When tooth 4) can to stroke brass • wheel wheel is lever . the 020'' be pushed with lever clearance to bracket adjusted ad allow by cancel should and between and jus a hand, to clearance through tte tin~ the engage the be.:•;een solerloid be {Fig. by escaoemer.t screws the the tooth. rat.cl.let rotated ol>ans its es 24, the of the on

r r

between bracket ble next a on credit screw adjusted after escapement which rotation tion mounting wheel the ger stop t.lle has after cancel of There tooth beneath support teeth the which ratchet is nearest the this sealed of so plate. cancelled. loosening cancel pawl. are lever of solenoid more may that bracket serves the the the and two wheel move the It has solenoid than the connecting The mechanism ratchet guide the solenoid should to the plunger about engaged when is ratchet one The guide prevent ratchet one adjusta brackets a tooth posi plun wheel 1/16" be and lin.ll: has the .

D. TERLOCKING INTERLOCi<ING RELAY S\riiTCH AND IN 19, M6) necting sol (Fig. enoid is I The tern 24, actuated link. JV!.l) interlocking (Fig. I t em through Cont&ct 21; 24, by Fig. Item the the switch cancel gap 19, 2; con B Fig. Item

be cancelled contact adjusted contact ratchet should it sufficient eration. switch the the tool. does, tripped extreme contact not is wheel. blade wear by the not The a out and close bending credit end pressure ca.llcel allowance with adjustment crHical. before cause If of too it from a the solenoid the may bending soon. erratic closes it may stroke, lower the has of be The be in If this may at op the I interlocking tem interlocking When 22) will selections switch operate relay has are after (Fig. closed. made, the 24, or open mounting ly wear cal closed ber at open grommets shock The contact allowance the contact contact relay plate. same reaching closes. to of should is time should prevent The mounted at it the normally least from open The have mechani normally normal in l/32 before the a rub 11 •

be cancelled contact adjusted contact ratchet should it sufficient eration. switch the the tool. does, tripped extreme contact not is wheel. blade wear by the not The a out and close bending credit end pressure ca.llcel allowance with adjustment crHical. before cause If of too it from a the solenoid the may bending soon. erratic closes it may stroke, lower the has of be The be in If this may at op the I interlocking tem interlocking When 22) will selections switch operate relay has are after (Fig. closed. made, the 24, or open mounting ly wear cal closed ber at open grommets shock The contact allowance the contact contact relay plate. same reaching closes. to of should is time should prevent The mounted at it the normally least from open The have mechani normally normal in l/32 before the a rub 11 •

6. SOLENOID DRUM ASSEMBLY

A. SEMBLY ACCESS TO SOLENOID DRU~ AS Solenoid Symphonola drum Symphonola out moved has screws carryover coin by plug the tion removing electrical the two Access assembly cancel tripper (Fig. by and plug wires Dr~ taking cabinet. frame one 23, switch can switch, the connecting assembly Assembly is terminating selector hex Item off be rear and bolted and nut, gained 13) the the doors The may and the (Fig. cable to two removing taking the plug be solenoid at to selec the of the motor re 25) the the that 5 the 15

necessary ates drum maintenance conductor chassis. a at ssem'Qly the to power amplifier. work, remove from cord it the the will that Symphon~la For solenoid termin not most be B. SELECTION SOLENOIDS

necessary ates drum maintenance conductor chassis. a at ssem'Qly the to power amplifier. work, remove from cord it the the will that Symphon~la For solenoid termin not most be B. SELECTION SOLENOIDS

and up. 25, one (Fig. taking bly (Fig. off removing of Item \vhen A 25, 25, defective the the the 11) Item Item selections solenoid Solenoid Symphonola may the 8) 12) be solenoid selector and should Drum replaced plungers are solenoid Chassis Assem made, disc k1ush (Fig. by

and up. 25, one (Fig. taking bly (Fig. off removing of Item \vhen A 25, 25, defective the the the 11) Item Item selections solenoid Solenoid Symphonola may the 8) 12) be solenoid selector and should Drum replaced plungers are solenoid Chassis Assem made, disc k1ush (Fig. by

Service Manual '41 Models 7800, 7850, 8800 and 9800

Sernce Manual '41 Models 7800, 7850, 8800 and 9800

leads When With placed and blades moved placed. tive guide guide the the defective selector leads t t the and plate aking Soldered erminals. plate and must aid The a that the o:ff be new (Fig. tne disc of solenoid solenoid collector unsoldered to connect a solenoid collector the may soldering 25, their solenoid guide Item then may to respec re brush brush from them. be be 9). plate iron re re C. MOTOR CONTROL RELAY

may mately Symphonola control or in capable when motor Item closed. amplifier spring receives volt tion. the the stop (Fig. ther.e tne be solenoid relay 12) The the pin power 25, carryover power checked 30 Its (Fig. relay of may and are motor Tne solenoid its volts or coil Item motor. contacts indicating transformer 25, Master plunger current circuit up motor be the fails may 2) with control A.C. or'when an Item switch plunger ulunger should open be control If a Control operate to or from (Fig. 13). defective volt approxi the on operate, relay between circuit is the contact operate motor and the the meter 25, relay Thi Sta tbe 25 s not bending operates cc:mtacts sure sufficient, creased contact are trouble with pitted. dirty start, If or the by the they blade tool. in and If ha.ve contacts. or the bending the motor it the may the pitted, with insufficient most should If relay pressure Symphonola be control the a the dirty Either likely would contact they be contacts stationary in is and relay may be pres the does in be

16

cleaned tool. with a contact burnishing 22) spring relay tained trol the which motor Access relay and elips. by control is removin~ i cover ts to held contacts the (Fig. in relay motor the place motor 25, is by control ob over Item two con does of over should to the stop its turntable If not switch travel, be the the open ad Syrnphonola motor jus (Fig. is the the ted. at motor control 25, motor the Item motor bottom circuit carry relay 2) when D. HELIX ALIGNMENT OF REAR VERTICAL until unit screws should position responding of loosen lower pin the Item the tor the selector disc rear (Fig. is ?) To coupling the of then Symphonola the .and ready al for Helix (Fig. respective 25, the tgn record set rotate be disc selecting for lower Item the tightened arm, 40, screws (Fig. operation. tray. Chassis, stou solenoid ll) I the coupling allow tem finger 40, for helix the (Fig. to 9) and The Item a engage the cor selec first with is stop set arm 40, the 11) in E. PIN CANCEL RELAY

40, switch selector 25, tion tray Item Item with is The (Fig. selected. 6) 10) stop pin the operates 25, cancel to selection pin push Item when relay dovm in 16; a cancel conjunc record Fig. the (Fig. shaft that The when should selector the operate pin pin cancel freely reset relay so

Service Manual '41 Models 7800, 7850, 8800 and 9800

moving armature its essary push reset the tor the armature stop normal spring the shaft a power is selector pin. turn. position. may spring brought may to The be reset lack reduced stop strength is down If the too the pin i the nec stiff, selec by t into of will re F. ADJUSTJ•mN'r SELECTOR DISC AND STOP PIN ditions, Selector Solenoid fore between 25, is chassis Item tact the the gage justments necessary. Item plunger selector 10) Under electrical and the and the no Disc Drum 13). Selector should the should normal dismantled, adjustment is solenoid stop contact is (Fig. However, pushed contact mechanically be removed Disc operating pin 25, checked. spring plunger up (Fig. of Stop Item if is some from slowly, the made the be 25, con (Fig. 8) ad con en If the G. SELECTOR SHAFT ADJUSTMENT

no When screw selector noid lates selector shaft, side drum There this at the should thrust disc, shaft. the assembly end adjustment is bottom an thrust rotate of which adjustment There the which of of has is freely. shaft. should the on the regu been

sole the The be 17

adjustment made, tightened. the locking screw should nut on be this H. COUNTER UNIT

defective.. defective, ment. unit mended. for (Fig. should ter to tively register each factory Should in 26, The be that the selecting Item made it adjustment repairs the at If field the should 7) all, to the counter unit fail determine is unit pulse and a not is be check of to unit actually adjust proves returned recom or this regis fail posi I . COUNTER RELAY

unit are dials. It for register no are for Item time the units tact justments adjustments is kept closed, adjustment contacts this 8) The burnisher (Fig. the recommended be Other controls counter one unit returned counter clean are 26, the more of as than rather Item or when are (by counter the relay relay the the unit that to replacement seeing using recommended 7). counter necessary), critical. coun~er cont<~ct the contacts on defective (Fig. unit Each factory a the that con relay 26, ad will .

SERVICE NOTES

TO REGISIER I. PROPER IN NUMBER THE MECHANICAL OF CREDITS SELECTOR FAIL A. SPOND ~AGAZINE TO RELAY COIN DOES NOT RE let. not should cord respond If connection be the made magazine to a for at coin, a the relay l oose wall a check does lL~e out defective. wil'e magne1; (:Fig. The or 5A, posts. a magazine No. bad There F3207) connection relay may may be magnet on also a broken the be B . OF TOO COINS FE'.'I' PL INSERTED AYS FOR THE A~10UNT has from contacts a also contact Dirt pressure. coin contact be the the burnishing making accumulated contact contact or be The swttch the blades film insufficient it contacts coin should proper To is fails surfaces surfaces tool. should usually correct switches may dirt be contact. and to be nolished There be or or are contact make bent because pitted this, cleaned may because film pitted. may proper with

If not with the on a it a crease contact contact bending pressure. tool to in '1'00 OF COINS JI!ANY PLAYS INSERTED FOR TBE AJo{OUNT lever. as be when should outlined making One a coin be The of more checked coin in the passes l than coin switch and B the one above. switches serviced switch contact assembly may binding anii fail or not ment magnet may rotated. lever clearance as escapement after strengthened binding the to the and three the be lever cause ratchet the The lever to or the cutting escapement from (No. of ratchet hold and coils. play the between the ratchet This (Fig. any lever should F3207) have wheel. the by escapement the escapement magazine off. sort spring ma~azine cutting wheel 5A, about spring ratchet lever be wheel the . in The Check free teeth svri the l/64 lever escape of tch for switch of inch may and No. A may (No 1512A) off weak has is (No. relay wheel lever . be 1525A) moved been two 1150) to 2. MOTOR FAILURE

A. HOTOR DOES NOT START

heavy fier. are allow ing recti the i making play There n ve load it Make the motor magazine to on may proper mechanism turn.

sure fuse the be the are contact. motor a on blown roay contacts closed the and place or ampli Bind not de and in a 19

B. ~OTOR COUPLING MOTOR DOES I S IS SPUN NOT DISCONNECTED WITH START FINGERS UNTIL

~D

case starting starting winding the end may The plate switch wtnding cause win<iing. be a defective of of or switch the a trouble By burned motor, removing is starting in made out the this

Service Manual '41 Models 7800, 7850, 8800 and 9800

accessible. with with fine a clean sand It cloth. paper should and be wiped cleaned C. STARTING OUT CONTINUOUSLY WINDING CUTS IN AND motor duced ing allows ing the to enough winding in starting Th.Ls due speed the the speed .Ls to motor chassis is switch, usually switch the immediately to heavy to mechanism open closes whereupon just due drag, the come to again. re bind start which and up the D. 1lOTOR FUSE BLOWS

what ping There 14173). it ampere strument that blow. the should failure may blocks. If caused are The nontamperable the Before cause is a be most number completely motor the to replaced Be remove the ~use usual replacing, sure fuse of motor to reason reasons all with fuse the unblocked.

is blow. fuse ship blown in a (No. find is 2.5 to motor overload. coupling ~ears the (No. motor Binding 1071) should (Fi~. (Fig. may After and 4, in turn cause No. 4, tight the loosening No. freely.

3054) transmission the bearings 1083) motor and the the in to due be bricating grease lubricate cause light used grooves. tain cleaned to in Record to grade the dirt should bind. the oil Neither trays the off of or tray trays with ever tray If by good grit are grooves, grease applying may vaseline a be grooves almost quality in brush. be used the has jammed it cer a nor to be tray lu can been fore lubrication which in should ing a a If operating, cold will heavy be the allowed place often load will instrument over otherwise be on blow to the stiff, night, warm the has motor fuse. up the been plac it be 3. TWO RECORD OR KORE TRAY TRAYS SELECTOR AT ONE PULLING TIME OUT No line also depress If selector selector below two (Fig. . out 1181) trays The with engages 6A, the of two slide selector pawl line No. may one to the pawl be the i223) have centers springs selected, rail so withdrawn. spring springs helix ti\at moved should (Fig. of (No. the above it rollers down

causing the SA, be may 1184). roller The in or necessary. No. lugs ward moved with slide selector tempting (Fig. 1183) of slightlyJ the SA, uo rail, the or slide to grooves No. are be Make down. realign trays kept 6178) or pawls sure certain in move. the Before in which may that the (Fig. alignment helix have selector that this at the SA, is the q, TIMING OF MECHANICAL SELECTOR WITH REAR HELIX

miter sure In that gears realigning the (Fig. proper SF, the mesh No. helix, 1210) of the be is

20

1f maintained, of one the or selector two so rollers that is not the are disturbed. timing out of

r

Service Manual '41 Models 7800, 7850, 8800 and 9800

line greatly helix springs, with roller simplified the the adjustment mounting selector by bending stud pawl can (Fig.

be the 6A, downward selector ment No. of 1222) ~he until pawl r oll slightly spring the er proper ~~th is upward attained. the align or 5. TURHTABLE DOES HOT FUHCTION PROPERLY

A. TURNTABLE PLAYING POSITiON rAILS TO niSE TO faulty SAE10 rise there table se~wing If to spindle may oil. machine lubrication the the be playing turntable DO insufficient bearings. oil. NOT on USE position, fails the a Use l or turn ight to With dust off, operation lightly most with with bearings shaft flood ing matter table turntable the a Foreign by t;he or the position bearings generously to clean may means with grit turntable fingers, are bind. turntable until spindle be No. obstacles cloth. clean. mny of removed and and Dlrt the SfE10 enter the will and as up the cause in shaft and main Repeat Reo11 and follows: oil, motor from its wipe such the oil. down .foreign the upper switch, and off mov turn the as cut this springs springs too weak, If from (Fig. the replace turntable the SA, factory. No. with 1009) 11ft new are No. turntable slight too the turntable l528A) tightly. It play is gears and possible between There worm steel may gear should that be the worm meshed (:i"ig. teeth the (F'i be g. of 4, 4, No. 1022). ~he transmission

2 1

l casing can between taining table 528A) be worm moved to (Fig. c;he the allow gear steel teeth away 4, No. about (Fig. from of worm 1040) the . assembly 4, 1)05" the gears. No con turn play . B. WHEN TURNTABLE IN PLAYING DOES NOT POc;ITION

ROTATR

drive '1 1315) clutch clutch event, have the the Lable , Wo. jar turntable a The gear should the is pin slight 1014) the as turntable too turntable. clutch underneath it (No. be in engages loose soindle siippage replaced. 1528/,). the spring clutch it lower with In should the will to If th (No. absorb end (Fig. turn the ls not this of 4, gear pin 1016) 1077) on by cam clutch stop elevating tion, in t~e tion, turntable the No. means the the cam underneath turntable (No. in The (Fig. ~ounted it so the clutch will turntable 1014) roller the can of 1006) turntable that; elevating cam turntable SA, engage correct the be should on release in (Fig. the No. should (Fig. the adjusting sl!gh~ly gear. the the turntable 1528A). clutch turntable the 1, elevating cam playing engage SA, raised turntable pawl be No. clutch does If No. adjusted clear screw (Fig. 1006). (No. the the With posi posi not pin of

Se'rvice Manual '41 Models 7800, 7850, 8800 and 9800

6. IMPROPER ADVANCE Of REAR HELIX

A. SELfi'.C'l'OR ~1ECIIANIS~1 BINDS

selector selecting any iS'll properly. should part would The rotate of levers selec cause position. the freely tox are selector it mechanism to in Binding when operate the mechan the non of im B. FRONT HELIX Pil>TS CAUGJ1'1' ON SELECTOR LEVER TOOTH

1251) continues front and front on lowering helix should tion. the 'Nould I:' heli.x helix the pins levers To be a t~e rcelix repeat lowered eliminste to selector clear pins (Fig. engage stop above. coula the the (.Fig. slightly pin 5B, lev~er one this, same stop not No until 5B of . , toot 6062A) rotate, selec the teeth No tile by the h . C. IJI\2IIOPER TiiUNG OF RE.A.R HELIX

a cycle 6E, cesses at contact No. be positton, selector put revolution a adjusted a No. 6178A) The oolnt of pencil of 1822) keys rear the place then the where should as mark for cam are in sprocket helix follows: start the one each shaft. the on rotate in roller (J:'ig. roller of the the the complete (No. the When mechanism

This cancelled sprocket 21/20 6A, (F'Lg. re 12.21) is can all of in , 1807). If or screw in o.f segment selector is (No 21/20 recess pencil this the the ing justment (No. reterding mounted motion the . the helix gear selector 1816) 1822) recession. in of of amount mark, sprocket. T~is gear can is the a (Fig. through .

'~nd the on must revolution, not segmen't segment be and the (Ftg. is of watch the sprocket 5F, made controlled correc stop small The rotation the It selector the No 5A, the by lock directly must gear . rotation gear small ~ ~o 1809) or adjusting past , advancing rotation sn . one roller turn the of 1807). by ad the :Ln of the rotates (No. driv shaft th<::~t: D. SPROCKF.T HELIX LOCK TOOTH 110LLE R STOPe ON mechanical rot~tion, ping 1822) above. happen not sprocket No 6 6l78A) proper rotated the the A, . No. helix 1125) sprocket properly \o/hen with resttng distance. should when 'I'he 1807) in (No. rests lock t tbe tr1e such he selector segment . the tlmed Symphonola does stop 1221). lock on helix roller a in rear a The position nol. as after roller tooth the gear may ,Ls helix This helix explained \Fig. recess playing travel be of being (Flg. with (No. ~will stop is that SE, (No. the of the the in

7. CHANGING MECHANISM NOT SET IN OPERATION AT END Of RECORD PLAY

A. WORN OR DAf4fo.GED STOP G~OOVE

discard record. it with If is a such the new worn stop a one.

record out groo1re or damaged, and i n replaco the 22

B. BINDING OF TONE AR~~ SU??ORT ROD cause follow port Binding rod it the to (Fig. groove. skip of 611, the over [lio. This tone and ll21) binding arm not sup may

r

Service Manual '41 Models 7800, 7850, 8800 and 9800

should tempting be any remedied adjustments. be"ore at n ''• l NCOiilicCT CUTOFF ADJUSTr lENTS

needle ments made. be of be has turntable with until recor(ied the visable trip (Fig. l set found cutoi'f trave:..led 7 off The the 6C) be /8tne Occasionally in enters 11 to chenging adjusting necessary, where ~or nst operat.ion from spindle. and proper reset mechanism. such the to mal.!:e the the the within setting the a mechanism limits s!.op music center adju.stments screw Should a when refer record. mechanism r ecord groove a It has has set (No. the distance of to adjust is should may for been beer. the and ad 1085) to D. BlNDHW SEAFT OF TRMvSNISSION 1,10\il'l (Fig. The 4, No. tre.nsmission 1044) may worm be bind

shaft make forth 3054) ened the the gear large causing slightly, weak. ing. (Fig. bend., bend by break.

(Fig. may 4, Tt freely. worm The removing the No should too or mesh taking gear spring 4, . shaft 1075) sl'1arp the No. The too sllde (Fig. and care flat may 1071) to or may steel tightly, bind reforming no1; 10, spring be back the be and worm strength spring No. to too and the make E. BINDING OF TRIP LEVER

l~ from it clutch rear the o. rear L'"lg lever may hole l 1508) of engaging panel If ever should retaining cause the the through (No. prevent i.nstalled.

cabinet trip wor~ pressure the 1052). lever yoke the tng clutch freely is rear the against (Fig. The binding in yoke retain with the panel, trip 6C the , the in 8. NEEDLE DOES HOT ENTER RECORD GROOVE PROPERLY

b. ALIGNMEHT OF RECORD 01'' NEED:.E WI'rli EDGE f'rom dition adjustable with which contact imately No. rest tone table justed the recor 1846) arm a in As its will is for so record, 97/8" its the the d. being in edge. or that be an support reco!'d position proper turntable 3115 average found raised, the in the Ol'his diameter. that needle about needle hook position to as is comes record hol<ls may be the (Fig. tne 3/32" approx will sl:ould be on turn con up The the 6A, ad B. NEEDLE FAILS TO ENTER GROOVE

po.si 'tion If the on needle the record stays anC. in does

one No. may proper well 1121) 'Lhat far not tone the remedied, out 1121). enter t>e tone a$ arm the should reproduction caused excessive of arm instrument support as the level. It this support be playing t>y is traced binding rod record also will imy of may rod (Fig. groove> down cause music binding possible be wear. o:: (No. 6A, tqo and the as im it in out eled properly. of up If level, so the all instrument it parts should may is be funcLion too lev fGr needle This :;o (No. assist may A 1124) toward tone be the is a.rm adjusted movement sho\m the booster playing in if Fig. of spring necessary grooves the SA. 23

Service Manual '41 Models 7800, 7850, 8800 and 9800

of booster too the much record. spring tension, is If adjusted it the may tone cause

with arm the record to the tone playing when arm the to position. skid turntable across rises the 9. MOTOR CARRY OVER SWITCH ADJUSTMENT

A. CONTACT PRESSURE

adjusted ment bender. 5 when gauge inch (Fig. oz.) 125 The from is on 8, is made Motor No. grams the that applied the by 6179A) movable end. it Carry pressure means will with This should Over blade of just a (approx. adjust a gra.m Switch open at spring be so 1 3 . DEGREE OF CONTACT OPENING

contact's that ~0 When 1/8they 11 •

should in wlll the be be "o:ff" open adjusted from position 1/16 so 11

C. 5\'.ITCll T n1ING OF ~10TOR CARRY OVF.R described Symphonola be and switch ;;omplish done spacing Af~er position. by this above, chassis means the have adjustment, contact of been the In is adjusting order t~ming adjusted, to nressure be the to is oper

ac the to as hand, do oughly This Selector at ated at ated and cause as Under After phonola will ticular play ble is tacts. turntable the turntable trays. just:nent. tom the to 1m a be the the to helix r:ext of to the until until result, and is be will be lt if this pusr"ed this its slide bottom bottom tightened next number It chassis a impossible will Disc it loosened checked p:Ln. result. will may stops test condition, should is downward If it the stops all out it oin done, Stop. of of it be be just If not of is turntable will should just at rotated its stops is stopped its to the the tne and selected, then too this On be opens for stroke. selected see this the If stroke way be lower at stro.ke. completely early, slid the timing the happens be be too thls Sym the that this impossi up by is over the point. oper other switch thor up late, record bot be no and, pin the .iust con ad the par it the or 10. WARBLE 0 R TREMOLO EFFECTS IN THE MU Sl C

notes loudness causing pear things Sometimes to or may a be at a warbling contribute wavering tremolo. a rather the of music or Several high steady to varying will this. rate ap in needle Very near warble. in fective vibration Occasionally the often in needles permanent the loose distorting pickup will needles iron magnet may cause filings the or be or

tone de set tone. the The clean wJ.ll bearings Gummy contri'bute and new oil should oil or to dry applied.

tone be bearings washed warble. free might should couplers shaft effect. the couplings The in contribute is run its not motor are true. spring eccentric properly on should the to If suspension this motor these aligned be or mounted shaft and warble if the it

Service Manual '41 Models 7800, 7850, 8800 and 9800

6A, off These also spindle turntable and to "Burrs" produce burrs allow in the spindle the should varying free or the bearing. 11 flats No. movement be surfaces 1121, polished 11