Page 1
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
AM
radio for standard broadcast reception; operates
from 12 volt negative ground system.
Designed for custom installation in
the 1963 Rambler. This receiver
contains a plated chassis board,
5
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 multiple paths to the
B-
side. This in-
SERVICE STAT1
ON
SERVICE NOTES
PROCEDURE
1.
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 Customer'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 within the 12-month warranty period.
The removal or re-installation of
this receiver is customarily performed 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 considered as warranty repairs; and therefore, 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 OTHERWISE, RECEIVER .WILL NOT OPERATE AND DAMAGE TO COMPONENTS MAY RESULT.
4. TO SERVICE PLATED CHASSIS
BOARD
-
To remove the plated
chassis from the radio housing,
unsolder 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.
2.
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, reinstall 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 DESCRIPTION
-
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 component 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.
5.
TRANSISTOR REPLACEMENT
-
When replacing a transistor (other
2.
Fill
in Motorola Auto Radio Warranty Labor Claim, Part Number
54P480 884 and mail white and green
copies to: Service Department
(Warranty Group), Motorola Automotive 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 operation.
3.
The yellow copy of the Motorola
Auto Radio Warranty Labor Claim
q
is to be retained by the authorized
service .station for his files.
REAR
FRONT
S
PKR
811
4. Defective parts for warranty repairs made on this model are to be
sent to your Motorola Distributor
for free replacement, supported with
the defective parts return tag or
a
form which you are now using.
5.
Only those service shops authorized by their Motorola Distributor
can perform warranty repairs on a
AMERICAN MOTORS PART NO.
8991148
REAR SPEA ;RAM XER WIR
s.........
ING DIA(
8
. . .
. . . . .
.
MO'TOROIA
INC.
9401 WEST GRAND AVENLE;, rdANKLlN PARK, ILLINOIS
PART NO.
68P40056627
PR
I
CENTS
COPYRIGHT
1962
BY MOTOROLA INC. PRINTED IN
U
Page 2
0.
POWER TRANSISTOR
RE-
PLACEMENT
-
When replacing a
power transistor, be sure to:
A. Use the transistor specified
in the Replacement Parts List.
B.
Coat both sides of transistor
insulator with DC-4 grease
(Motorola Part No.
11
M490487)
to insure proper head dissipation.
C.
Securely and evenly tighten
the transistor mounting screws.
7.
REAR SPEAKER AK-401 - The
rear speaker used with this radio
has an
8
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
defecive stage through signal injection;
lext, through the use of voltage and
mesistance measurements, plus
dotorolals servicing tools, deternine the necessary maintenance
Bequired. Motorola's servicing
nethods and aids, when properly
med, can help make transistor serrice 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
Page 3
ALIGNMENT
Connect an AC VTVM across the speaker voice coil.
Set volume to
mdximum and tone to treble.
Attenuate signal generator output to maintain 2.83 volts (1 watt) on AC VTVM at all times to prevent receiver overloading. Refer to Alignment and Parts Locations detail during procedure.
I
Ant recept thru
.1 mf & Chassis
STEP
RF
ALIGN
MENT
2.
I
Ant recept thru
dummy (see Fig'
GENERATOR
CONNECTION
GENERATOR
FREQUENCY
I
1
ADJUST (400 cycle mod)
TUNER SET TO
d
stop
REMARKS
Adjust for maximum.
.
Adjust for maximum.
,
NOTE;
Do.not perform &eps 3, 4,
5
&
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.)
6.
I
Repeat steps 4
Hi end stop
Tuner carriage
9/1611 from hi
end stop
,
Hi end stop
5
until no further increase, then cement cores in plac
PLUG TO FIT RECEIVER
ANTENNA RECEPTACLE
TO
SIGNAL
TO
RECEIVER
GENERATOR-
+
ANTENNA
0-
RECEPTACLE
I
ETAL SHIELD CAN
--T---l
MUST BE ATTACHED
TO PLUG
Weak station
around 1200 Kc
Adjust for maximum.
7
Adjust for maximum, using alignment tool Motorola Part Number
66A76278.
Adjust for maximum.
last adjustment should be step
5.
Adjust for maximum with radio
installed in car and antenna fully
ext'
DUMMY ANTENNA
ANT CORE
OSC CORE RF CORE
1020 KC
1020 KC
1020KC
TO ANT RECEPT)
ALIGNMENT POINTS LOCATION DETAIL
Page 4
COMPONENTS SHOWN ARE ACTUALLY LOCATED ON OPPOSITE SIDE - COMPONENT SIDE OF
PLATING
CONTAINS
GROUND
CONNECTIONS
ONLY
-
SEE
PLATED
CHASSIS
BOARD'
DESCRIPTION
Page 5
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Page 6
r5
\3
CHASSIS
2N176 LOCKING
PWRAMP DRIVER SPRING
PARTS
LOCATION
Page 7
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 applicability 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
.........................
2.
T-4
*25C41617A01
OUTPUT........
e................
2.
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)
..................
2.
C-2 2031534810 5 mmf to 80 mmf trimmer
.......
.45 V-2 48K134601 2SA72 (converter)
..............
2.
.................
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)..............
.....
2.
.
~
-
-
-
C-5 *21D40339A63 .005 mf 100V..
.......-........
.25 V-5 48C124246 2N176
ipwr
amp).
...........
.:,.
...
4.
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
1
mf 3V
.......................
.70
330 mmf
lOOV
(USE 21K752589).. .25
.
.015 mf
lOOV
(USE 21K753895). .30
.47 mf 3V (USE
21K10003A01).
..
.45
...
1
mf 3V (USE 21K10003A02). .70
.05 mf
lOOV
mylar
............
.35
.............
.l
mf
lOOV
mylar .35
100-500-500
mf/l6V electrolytic
.............
(USE 23C40302A04) 3.40
............
SPARK PLATE: 1 x
1"
.05
SPARK PLATE: 53/64
x
1-7/8".
.
:.
.lo
....
1
mf
3V (USE
21K10003A02) .70
1
mf
3V
(USE
21K10003A02)..'.. .70
...................
.22 mf 100V .55
..............
.0027 mf
lOOV...
.20
MISCELLANEOUS ELECTRICAL PARTS
....................
components
1
COVER, housing
..................
ESCUTCHEON, dial: incls dial
scale
.........................
2
INSULATOR, transistor.
...........
KNOB, tone & dummy.
..............
.
KNOB, volume & tuning
.....,....
LEAD, speaker (USE 30B41627A01)
.
RECEPTACLE. antenna
............
RECEPTALCE
;
fuse (USE
9C41095AOl)
..................
1.
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
l
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
1.
.
#*32C41727A01 GASKET, speakek
................
.....
L1 L2
&
L3
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%
1/
2W...
.17
R-20 6S125C69 6800 10% 1/2W
................
.17
R-21
6S125C43 560 10%
1/
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
Br
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
IN
ANY
LIST FOR FIRST TIME
#
LIMITED REPLACEMENT
ITEM,
TBE VOLUME
OF
REPLACEMENT
0
ITEMS IS SMALL, THEREFORE, IT IS SUGGESTED
TH4T
ORDERING BE DONE ONLY
AS
REQUIRED.
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