Table of Contents
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SYSTEM
SPECIFICATIONS
.
COMBINATION
NOMENCLATURE
.
DESCRIPTION
...
LBr31072
TABLE
OF
CONTENTS
1ii
iv
\/
1
OPERATION
2
,'
INITIAL
ADJUSTMENT
Transmi
tter
Adjustment
Receiver
Adjustment
Re-Installation
CIRCUIT
ANALYSIS
Transmitter.
Recei
ver
Channel
Gua
rd
Power
Distribution
MAINTENANCE
...
Disassembly
....
Driver
& PA
Transistor Replacement ...
Removing
ICrs
.
TEST
AND
TROUBLESHOOTING
PROCEDURES
Service
Techniques
Test Points .. ..
Transmitter Alignment
Procedures
Receiver Alignment
Procedures
Receiver Test
Procedures
Receiver Audio and Squelch
lltaveform
Checks
OUTLINE
DIAGRA.MS
2
,\-
2--
2
,
z
6_
7'
o
10
10
11
12
72
12
12
15-16
L7
l8
l9
Transmitter/Recei
I
n
t
ercon
nec
t
/Osc
i
ver Board ......
llator/Channel
Guard
Board
24
24
23
25-26
27
-29
30
30
3L-34
32
SERVICE
SHEET
Hookswi
tch
.
.
Externa
I
Speaker
SYSTEM INTERCONNECTION
DIAGRAM
SCHEMATIC
DIAGRAMS
Interconnect/Osci 11ator/Channel
Guard
Board
Transmitter/Receiver Board (Sheets 1, 2
&,3)
PARTS
LIST
PRODUCTION
CHANGES
ILLUSTRATIONS
1 - Transmitter/Receiver Block
Diagran
2 -
Power
Distribution
..
3 -
Q251
Lead
Identification
4 -
Mechanical
Layout ....
5 - Test Equipnent Set
Up
6 - Transmitter
Troubleshootlng
7 - Receiver
Troubleshooting
Figure
F
i
gure
Fi
gure
Fi
gure
Fi
gure
Fi
gure
Fi
gure
J
o
11
L4
l6
2L
Although the highest
DC
voltage in this mobile equipment is supplied by the vehicle
battery, high currents
may
be
dravrn
under short circuit
conditions.
These
currents
can
possibly
heat
.metal objects such as tools, rings, watchbands, etc.,
enough
to
cause
burns.
Be
careful
when
working near energized circuits!
High-1eve1 RF
energy in the transmitter
Povrer
Amplifier assembly can cause
RF burns
upon
contact.
Keep
away
frorn these circuits
when
the transmitter is
energizedl
11
Copyrignt
@
tgBl
cenerat Etectric Company
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