
Replacing the Circuit Board Fuse
3-5
3.6
Replacing the Circuit Board Fuse
In cases where the radio fails to turn on when power is applied, the circuit board fuse should always
be checked as a probable cause of the failure. The locations of the fuse for both the UHF and VHF
boards are shown in Figure 3-1. The radio must be disassembled to replace the fuses as described in
the Basic Service Manual (see Section 1 - Related Documents); then the circuit board must be
separated from the radio chassis as described in the paragraphs that follow.
Figure 3-1. UHF/VHF Circuit Board Fuse Locations
6680334B49
6680334B50
6680334B51
6680334B52
6680334B53
6680370B51
6680370B54
6680370B57
6680370B58
6680371B15
6680371B74
6680332E45
6680332E46
0.410” x 0.410”
0.430” x 0.430”
0.492” x 0.492”
0.572” x 0.572”
0.670” x 0.790”
0.475” x 0.475”
0.710” x 0.710”
0.245” x 0.245”
0.340” x 0.340”
0.460” x 0.560”
0.470” x 0.570”
0.591” x 0.315”
0.862” x 0.350”
Heat-focus heads for R-1319A work station
Table 3-1 Recommended Test Tools
Motorola Part
Number
Description
Application
C107
3
C144
CR102
2
L104
E101
R329
R102
H101
C123
C126
C128
C130
C138
C150
C151
C152
C170
L112
C
134
C
135
R
134
C503
CR306
F501
SH304
C309
C310
CR303
L304
Q301
304
C306
C311
C312
C313
C314
C315
C321
C395
CR304
L305
L306
L340
R305
R347
SH302
C316
C317
C318
C380 CR305
L307
R306
R307
C329
C336
C337
C355
C360
C361
L314
C347
C348
C356
SH322
C340
C341
C342
43
R344
1
37
25
13
U301
C344
R350
2
3
B501
C326
C327
Q30
2
R311
R312
R313
R315
C279
U248
C500
CR501
C201
C224
C231
C232
C234
R201
R202
R231
R232
R233
C202
C204
C219
C223
C263
C264
C293
C298
L261
SH202
1
37
25
13
U201
C207
C208
C218
CR
R204
R281
U210
C
C259
C2
4
3
U211
C
C254
C255
CR251
L251
R251
R252
R254
11
1
20
10
U241
C371
C372
45
CR241
4
2
C241
C242
C243
C244
C245
C246
C250
CR242
CR243
L241
R241
R242
R244
SH242
F501