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SERVICING
It is recommended that servicing of this receiver be done
by the factory service center. Special equipment and skills are
maintained at the factory to give fast and efficient service on
all of our products.
When returning radio receivers to the factory for service,
include crystals, ac and dc power cables and telescoping
antenna. Disconnect cables and antenna, pack carefully and
include a brief. detailed description of the difficulty )'ou are
having.
The receiver circuitry
is designed to utilize the best
features of four types of semiconductors:
rectifier diodes,
conventional bi-polar transistors, insulated-gate field-effect
transistors and integrated circuits.
Servicing should not be
attempted by anyone who is not familiar with the manu-
facfurer's recommendations and cautions relating to each of
these devices. The use of ohmmeters is particularly hazardous
since they can deliver voltages and currents large enough to
damage semicon duc tors.
SERVICE PARTS LIST
(pRrcES SUBJECT'l'O
CHANGE WTTTTOUT
NOTICE)
M A I N B O A R D
R e f . N o .
Resistors, t/+W lOTo
List Price
Unusual circuitry in this receiver includes the automatic
tuning system in the
o'f,"
and
"H"
modules.
I.C.-101,
I.C.-201
and the associated circuits generate tuning voltages
to track the antenna, r-f and oscillator circuits as channels are
scanned. The
"U"
is broadbanded in a more conventional
manner. Also, when the
"Ll'
module is operating, the antenna
loading coil [,-1
is switched into the telescoping antenna
circui t.
Audio output power is measured with bursts of modula-
tion
or by measuring the maximum
excursion on voice
modulation as shown on an oscilloscope. When a continuous
tone is received, the output will start at full power and then
decrease to approximately half power to protect the output
integrated circuit from overload. It will then return to full
po$-er for voice communications.
The LED indicators have a forward voltage drop of about
l.6v at 20ma. The current should not exceed 50ma. They are
polarized and may be damaged by a high reverse voltage.
When a channel lamp does not light, the failure may be either
the lamp or the switching I.C. If the channel works, check the
lamp; if not, check the I.C.
When groups of lamps are out,
refer to the logic chart.
Capacitors
. 0 0 1 m f . 2 0 % D i s c . C e r . . . . . . . . . . . . .
. 0 1 m f . 2 0 % D i s c C e r . . . . . . . . . . . . . . . . .
. O 4 7 m f . G M V D i s c . C e r . . . . . . . . . . . .
. l m f . G M V D i s c . C e r .
3 . 3 p t l O % D i s c . C e r .
. 0 2 m f . 2 0 % D i s c . C e r . . . . . . . . . . . . . . . .
. 2 2 m f . 1 0 % M y l a r .
l 5 0 p f 2 0 % D i s c . C e r . . . . . . . . . . . . . . . . .
2 5 m f . l 0 V L y t i c . .
I 0 0 p f 2 0 % D i s c . C e r . . . . . . . . . . . . . . . . .
l 0 0 m f . 3 V L y t i c . . . .
5 0 0 m f . 1 0 V L y t i c . .
. 0 4 7 m f . M y l a r . . . . . . . . .
2 0 0 0 m f . 2 0 V L y t i c . .
l 0 0 m f . l 5 V L y t i c . .
2 m f . 3 5 V L v t i c . . . . . . . . .
S e m i - C o n d u c t o r s
List Price
2 N 3 5 6 3 F . C . . . . . . . . . .
. 7 5
M P S 3 3 9 3 M o t . . . . . . . . . .
. 7 5
2 N 3 6 4 0 . . . . .
. 7 5
T r P - 2 9 T . I . . . . . . . . . . . .
1 . 5 0
I \ + I + 8 . . . . . .
. 5 0
rN3+A.......
.50
I N 5 2 4 l B l l V 5 % . . . . . . . . . . . . .
1 . 0 0
rN400l
.50
LM703LN Nat. ..........
1.50
S N 7 6 6 4 3 N o r U L N 2 I I I A . . . . . . . . . 4 . 0 0
T , 4 . - 6 1 l C S . G . S .
5 . 0 0
s N - 7 4 7 4 . . . .
2 . 0 0
s N - 7 4 2 6 . . . .
1 . 0 0
A-259 Light Emitting Diode....... 1.50
Inductors
A - 2 1 9 - 1 L o a d i n g C o i I . . . . . . . , . . . . . . . . . 1 . 0 0
A - 2 1 8 - l R F C h o k e . .
. 5 0
A - 2 0 5 - l R F C h o k e . .
. 5 0
A-218-2 RF Choke..
.50
A - 2 6 1
. 5 0
B ' - 2 1 7 - 2 I . F . C o i l . . . . .
2 . 0 0
B - 2 O 2 P o w e r T r a n s f o r m e r . . . . . . . . . .
3 . 0 0
Miscellaneous
A - 1 3 5 C r y s t a l
( F r e q u e n c i e s a s r e q u i r e d ) . . . . . . . . . . . 5 . 0 0
A - 2 2 6 C r y s t a l F i 1 t e r . . . . . . . . .
1 0 . 0 0
8 - 2 5 4 " M a n u a l - S c a n " S w i t c h . . . . .
2 . 0 0
S l i d e S w i t c h , S P D T . . . . .
. 7 b
A n t e n n a C o n n e c t o r N o . 1 2 0 7 . . . .
. 7 b
A n t e n n a P l u g N o . 1 2 0 0 . . . . . . . . . . . . . .
. 7 b
E x t . S p e a k e r J a c k N o . 3 5 1 2 A . . . . .
1 . 0 0
P o w e r C o n n e c t o r P 3 3 0 4 A B . . . . . . .
1 . 0 0
P o w e r S o c k e t 5 - 3 3 0 4 F H T M . . . . . .
1 . 0 0
D C C o r d A s s e m b l y . . .
1 . 5 0
A C C o r d A s s e m b l v . . .
1 . 5 0
. 5 0
. 5 0
. 5 0
. 5 0
.50
. 5 0
.50
.50
1 . 0 0
. 5 0
1 . 0 0
1 . 0 0
. 5 0
1 . 5 0
1 . 0 0
. 1 5
\ I o b i l e \ l o u n t i n g K i t . . . . . . . . . . . . . . . . .
8 - 2 4 8 S p e a k e r 3 " x 5 " 3 . 2 o h m .
2.00
3 . 0 0
A - 1 3 8 - 2 T e l e s c o p i n g A n t e n n a . . . .
1 . 5 0
8-228 Front Pane1.........
l '7 5
C - 2 3 3 T r i m . . . . . . . . . .
3 . 0 0
C - 2 0 3 W r a p A s s e m b l y . . . . . ' . . . . . . . . . . 7 . 5 0
A - 2 3 7 A n t e n n a B u s h i n g . . . . . . . . . . . . .
. 7 5
K n o b R B - I 5 5 - 8 4 0 . . . . . . .
. 7 5
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