Motorola 8991142 User manual

Brand: Motorola

Model: 8991142

Type: User manual

OLA 3TMR

IOTORS

8991142

MOTOROLA

GENERAL INFORMATION

no-charge basis to the customer. If

you are not already authorized as a

Motorola Auto Radio Service Station

and you are interested in handling

this service, please contact your

Motorola Distributor for complete

details.

TYPE

Automotive type all-transistor

superhetrodyne

radio for stand-

ard broadcast reception; operates

from 12 volt negative ground system.

Designed for custom installation in

the 1963 Rambler. This receiver

contains a plated chassis board,

transistors and 2 diodes. Some

installations use a rear speaker and

control (AK-401

American Motors

Part

8991 148).

TO SET PUSHBUTTONS

Allow receiver to warm up for

fifteen minutes. Pull up on push

buttons to unlock. Push down firmly

on pushbuttons to lock after station

has been selected.

All B- connections are carried

through the placir chassis in multi-

ple paths to the

B-

side. This in-

SERVICE STAT1

SERVICE NOTES

PROCEDURE

RADIO POLARITY

WHEN SER-

VICING THIS RECEIVER, THE

"A"

sures a good low resistance return

path. Two separate and independent

paths are provided to ground.

1. A defective in-warranty radio

must be accompanied by the Custom-

er's Warranty Policy Tag. This tag

must be properly filled in by the

American Motors dealer at the time

of radio purchase. Accept as war-

ranty repairs only those radios with-

in the 12-month warranty period.

The removal or re-installation of

this receiver is customarily per-

formed by the American Motors

dealer and is not covered by this

warranty. Also, the removal of

motor noise, tire static, electrical

interference, faulty installations,

and aerial repairs are not consider-

ed as warranty repairs; and there-

fore, expenses related to such

ser-

.vices should' be handled by the car

dealer.

LEAD MUST BE CONNECTED TO

THE POSITIVE SIDE OF POWER

SOURCE. IF CONNECTED OTHER-

WISE, RECEIVER .WILL NOT OP-

ERATE AND DAMAGE TO COM-

PONENTS MAY RESULT.

4. TO SERVICE PLATED CHASSIS

BOARD

To remove the plated

chassis from the radio housing,

un-

solder the plated chassis ground

wire from chassis housing. Release

the chassis board locking spring

and carefully lift chassis board out

of housing. Position the chassis

board vertically with respect to

radio housing for servicing.

POWER SUPPLY REQUIRE-

MENTS

It is preferable to use a

storage battery (without a battery

charger) in place of a battery elim-

inator. If a battery eliminator is

used, it must be well filtered and

regulated.

After servicing is performed, re-

install plated chassis board. Make

certain chassis board is properly

placed in the grooves of the chassis

retaining brackets and locked in

position with the chassis

boardlock-

ing spring. Re- solder ground lead.

3. PLATED CHASSIS BOARD DES-

CRIPTION

Motorola' s placir

chassis has plating on both sides

o_f

the chassis board. The exposed side

contains the actual circuit connec-

tions while the plating on the com-

ponent side of the chassis board

provides a convenient chassis B-

return for components and circuit

wiring. Plating on the component.

side also provides shielding between

the top and bottom of the unit

similar to a metal chassis

whichin-

corporates hand wiring.

TRANSISTOR REPLACEMENT

When replacing a transistor (other

Fill

in Motorola Auto Radio War-

ranty Labor Claim, Part Number

54P480 884 and mail white and green

copies to: Service Department

(Warranty Group), Motorola Auto-

motive Products, Inc.. 9401 West

Grand Avenue. Franklin Park,

Ill.

than the power transistor), grasp

the transistor leads (between tran-

sistor body and plated chassis board)

with a pair of long nose pliers to

prevent excessive heating of tran-

sistor body during soldering opera-

tion.

The yellow copy of the Motorola

Auto Radio Warranty Labor Claim

is to be retained by the authorized

service .station for his files.

REAR

FRONT

PKR

811

4. Defective parts for warranty re-

pairs made on this model are to be

sent to your Motorola Distributor

for free replacement, supported with

the defective parts return tag or

form which you are now using.

Only those service shops author-

ized by their Motorola Distributor

can perform warranty repairs on a

AMERICAN MOTORS PART NO.

8991148

REAR SPEA ;RAM XER WIR

s.........

ING DIA(

. . .

. . . . .

MO'TOROIA

INC.

9401 WEST GRAND AVENLE;, rdANKLlN PARK, ILLINOIS

PART NO.

68P40056627

CENTS

1962

BY MOTOROLA INC. PRINTED IN

POWER TRANSISTOR

RE-

PLACEMENT

When replacing a

power transistor, be sure to:

A. Use the transistor specified

in the Replacement Parts List.

Coat both sides of transistor

insulator with DC-4 grease

(Motorola Part No.

M490487)

to insure proper head dissipa-

tion.

Securely and evenly tighten

the transistor mounting screws.

REAR SPEAKER AK-401

The

rear speaker used with this radio

has an

ohm voice coil, therefore,

when replacing this speaker, use

an exact Motorola Replacement

Part.

TRANSISTOR RECEIVER

SERVICE METHODS

Trouble shooting transistor radios

is basically similar to servicing

'ube sets. First isolate the

defec-

ive stage through signal injection;

lext, through the use of voltage and

mesistance measurements, plus

dotorolals servicing tools, deter-

nine the necessary maintenance

Bequired. Motorola's servicing

nethods and aids, when properly

med, can help make transistor ser-

rice easier.

lefer to "Profitable Transistor

,Cadi0 Servicing" manual (Motorola

Part No.

68P60011A53) and IIA Dis

cussion Of Transistorized Car Ra-

diosfl manual (Motorola Part No.

68P64980A51).

PUS HBUllON REMOVAL

LIFT PUSHBUTTON RElAlNlNG SPRING

AND PUU

BUlTON STRAIGHT BACK.

TO REPLACE, PRESS PUSHBUTTON IN

FIRMLY

UNTIL RETAINING SPRING

SNAPS INTO LOCKED POSITION.

PUSHBUTlMlN REMOVAL

EMBLY

SPEAKER

UPPORT ASSEMBLY

RADIO SPEAKER

INSTRUMENT

PANEL

RADIO

ASSEMBLY

LAJ

SPEAKER MOUNTING

INSTALLATION INSTRUCTIONS

ALIGNMENT

Connect an AC VTVM across the speaker voice coil.

Set volume to

mdximum and tone to treble.

Attenuate sig-

nal generator output to maintain 2.83 volts (1 watt) on AC VTVM at all times to prevent receiver overloading. Re-

fer to Alignment and Parts Locations detail during procedure.

Ant recept thru

.1 mf

Chassis

STEP

ALIGN

MENT

Ant recept thru

dummy (see Fig'

GENERATOR

CONNECTION

GENERATOR

FREQUENCY

ADJUST (400 cycle mod)

TUNER SET TO

stop

REMARKS

Adjust for maximum.

NOTE;

Do.not perform &eps 3, 4,

6 unless tuner has been tampered with o; components have been replaced;

(

Before proceeding with step 3, back tuning cores out of tuning coils to eliminate their effect on trimmer:

Ant recept thru

dummy (see fig.)

Repeat steps 4

Hi end stop

Tuner carriage

9/1611 from hi

end stop

Hi end stop

until no further increase, then cement cores in plac

PLUG TO FIT RECEIVER

ANTENNA RECEPTACLE

SIGNAL

RECEIVER

GENERATOR-

ANTENNA

RECEPTACLE

ETAL SHIELD CAN

--T---l

MUST BE ATTACHED

TO PLUG

Weak station

around 1200 Kc

Adjust for maximum.

Adjust for maximum, using align-

ment tool Motorola Part Number

66A76278.

Adjust for maximum.

last adjustment should be step

Adjust for maximum with radio

installed in car and antenna fully

ext'

DUMMY ANTENNA

ANT CORE

OSC CORE RF CORE

1020 KC

1020KC

TO ANT RECEPT)

ALIGNMENT POINTS LOCATION DETAIL

COMPONENTS SHOWN ARE ACTUALLY LOCATED ON OPPOSITE SIDE

COMPONENT SIDE OF

PLATING

CONTAINS

GROUND

CONNECTIONS

ONLY

SEE

PLATED

CHASSIS

BOARD'

DESCRIPTION

,,.I.

%?S$

asp

;

'g2

i,,

;.J

CHASSIS

2N176 LOCKING

PWRAMP DRIVER SPRING

PARTS

LOCATION

REPLACEMENT PARTS LIST

NOTE: When ordering parts, specify model number of set in addition to part number and description

of part. Electronic parts of equivalent rating are not necessarily of equivalent standards.

The components listed in this Service Manual have been chosen for reliability and applica-

bility to the specific circuits involved. For

maximuh customer satisfaction and minimized

call-backs, use the exact Motorola parts replacement.

Ref. Part

No. Number Description

ELECTRICAL PARTS

List Ref. Part

Price No. Number Description

Lis

Pri

T-3 *25C41618A01 DRIVER

.........................

T-4

*25C41617A01

OUTPUT........

e................

Capacitor

Note:

All

capacitors are ceramic disc type

unless otherwise

srecified TRANSISTORS

C-1 21D40339A15 .0033 mf

lOOV

(USE

21D40339A31

...................

.20

V-1

48K134601 2SA72(RF amp)

..................

C-2 2031534810 5 mmf to 80 mmf trimmer

.......

.45 V-2 48K134601 2SA72 (converter)

..............

.................

C-3 21D40339A63 .005 mf

lOOV

(replace with V-3 48K134601 2SA72 (1st IF) 2.

same value as orieinal

art)..

.25 V-4 48C124300 2N573 (driver)..............

.....

C-5 *21D40339A63 .005 mf 100V..

.......-........

.25 V-5 48C124246 2N176

ipwr

amp).

...........

.:,.

...

C-7

*20C40481A06 DUAL TRIMMER C7A 275 mmf to

350 mmf; C7B 220 mmf to 330

...........................

mmf 1-60

C-8

*21D40339A69 .0068 mf

lOOV

(USE 21R131333). .30

MECHANICAL PARTS

..................

C-9 21D40536A27 150 mmf 100V .20 *7B41520A01 BACKGROUND, dial scale

...........

C-10 21C40906A10 .005 mf

lOOV

mylar .30 84D41655A03 BOARD, plated panel:

less

qll

mf 3V

.......................

.70

330 mmf

lOOV

(USE 21K752589).. .25

.015 mf

lOOV

(USE 21K753895). .30

.47 mf 3V (USE

21K10003A01).

.45

...

mf 3V (USE 21K10003A02). .70

.05 mf

lOOV

mylar

............

.35

.............

lOOV

mylar .35

100-500-500

mf/l6V electrolytic

.............

(USE 23C40302A04) 3.40

............

SPARK PLATE:

.05

SPARK PLATE: 53/64

1-7/8".

.lo

....

3V (USE

21K10003A02) .70

(USE

21K10003A02)..'.. .70

...................

.22 mf 100V .55

..............

.0027 mf

lOOV...

.20

MISCELLANEOUS ELECTRICAL PARTS

....................

components

COVER, housing

..................

ESCUTCHEON, dial: incls dial

scale

.........................

INSULATOR, transistor.

...........

KNOB, tone

dummy.

..............

KNOB, volume

tuning

.....,....

LEAD, speaker (USE 30B41627A01)

RECEPTACLE. antenna

............

RECEPTALCE

;

fuse (USE

9C41095AOl)

..................

SCALE, dial..

..................

SCREW, tapping: #6x1/2; clutch

.........

head (transistor mtg)

SOCKET, pilot light (USE

9A591971)......

...............

9C40264A03

SOCKET,

transistor (pwr amp

..............

USE 9C40264A01)

.............

E-1 48K134587 DIODE: 1N139 (AVC) .70

E-2 48K134587 DIODE: 1N139 (Det).

............

.70

....

E-3 65~538410

LAMP,

pilot #1892.......... .25

NSTALLATION PARTS

ACCESSORIES

E-4 65R122345 FUSE, 5 amp

....................

.03

E-5

50C40780A03 SPEAKER, PM: 6x9; 8QVC (USE

*75A41785AOl BUMPER, speaker

...............

..................

..........

50C40780A01) 11.35 8A500109 CAPACITOR, generator

*lB41553A01 CHOKE, instrument cluster

..................

COILS

CHOKES suppression

#*32C41727A01 GASKET, speakek

................

.....

L1 L2

See Tuner Parts

#*lV41700A36 KIT, radio ipstallation.. 3.

L-4 *24C40788A04 IMAGE TRAP.....

................

.n!i

2K565208 NUT, hex: 1/4-2Ox7/16x1/8

................

L-5 *25~41619~01 CHOKE, filter..

1.715

CONTROLS

..............

R-18 *18€40764A03 VOLUME, tone

SW 2.70

RESISTORS

NOTE:

All

resistors are insulated composition

type unless otherwise specified.

R-1

6S125C49 1000 10% 1/2W

................

.17

R-3

6S125C43 560 10% 1/2W (replace with

same value as original part).. .17

R-

5 6S125C63 3900 10% 1/2W..

..............

.17

............

R-6 6S125C91

56,000 10% 1/2W.. -17

R-7 6S125C49

1000 10% 1/2W

................

.17

R-

8 6S125C81

22,000

1096

1/2W (replace with

same value as original part).. .17

R-9

6S125C93 68,000 10% 1/2W

..............

.17

R-10

6S125C99 120,000 10% 1/2W

.............

.17

R-11

6S125C81 22,000 10% 1/2W

..............

.17

R-12

6S125C91 56,000 10% 1/2W

..............

.17

R-13

6S125C43 560 10% 1/2W (replace

with

same value as original part).. .17

................

R-14 6S125C67 5600 10% 1/2W .17

R-15

6S125C73 10,000 10% 1/2W

..............

.17

R-16

6S125C79 18,000 10% 1/2W

..............

.17

.................

R-17 6S125C43 560 10% 1/2W .17

R-18

See Controls

...........

R-19 6S125C83 27,000 10%

2W...

.17

R-20 6S125C69 6800 10% 1/2W

................

.17

R-21

6S125C43 560 10%

2W.

................

.17

R-22

6S125C37 330 10% 1/2W

.................

.17

R-23

17C40259A02 75 10% 1/2W wirewound

PTC....

.35

R-24

*17C40258A05 2.7 5% 1/2W wirewound..

......

.40

R-25

*17C40258A04 .33 10% 1/2W wirewound

PTC.

...

.45

R-26

6S124C89 47,000 10% 1/4W..

.............

.17

R-27

6S125Cll 27 10% 1/2W

...................

.17

TRANSFORMERS

(brkt mtg)

..................

NUT, hex: 1/2-28x5/8~3/32

(radio mtg)

..................

PLATE, speaker mtg

............

SCREW, tapping: #6x1/2 (spkr

to plate)

....................

TUNER PARTS

BEARING, ball.....

............

CLUTCH

DISC ASSEM.

..........

COILS

MTG PLATE ASSEM..

.....

CORE, iron (ant

RF)

.........

CORE, iron (oscillator)

.......

CROWN GEAR

PINION ASSEM

.....

GEAR BUSHING

DISC ASSEM...

GROMMET, core mtg

.............

LINK, connecting

..............

POINTER

STUD ASSEM

..........

PUYHBUTTON

....................

ROLLER, clutch release.

.......

SCREW

NUT ASSEMi adjustable.

SCREW, set

4-40x5/16 (clutch

disc assem)

................

SCREW, tapping: #4x7/16 (coils

mtg)

.........................

SHAFT, drive: incls discs.....

'SHAFT, manual tuning

..........

SPRING, anti-rattle (on clutch

brkt)........................

SPRING, clutch release.

.......

SPRING, connecting link.......

SPRING, pointer......

.........

SPR1NG;retaining (manual

shaft)

.......................

SPRING, retaining (pushbutton)

SPRING, tension (pointer)

.....

*77D41550A01 TUNER, AT-407: complete..

..............

T-1 *24D41583A02

1st

IF: 262.5KC.. 1.95 43692188 WASHER, "C" (pointer).

...

...............

T-2 *24D41583AOl 2nd IF: 262.5KC. 2.10

4.4562431 WASHER, cup (clutch).

....

*NEW ITEM, APPEARS

ANY

LIST FOR FIRST TIME

LIMITED REPLACEMENT

ITEM,

TBE VOLUME

REPLACEMENT

ITEMS IS SMALL, THEREFORE, IT IS SUGGESTED

TH4T

ORDERING BE DONE ONLY

REQUIRED.

Motorola 8991142 User manual

Motorola 8991142 User manual

Motorola 8991142 User manual

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