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Maintenance:
Removing and Reinstalling the Circuit Board
3-7
3.8
Removing and Reinstalling the Circuit Board
Both the UHF and VHF circuit boards are removed from the radio chassis in the following manner:
1. Refer to the Basic Service Manual (see
Table 1-1, “Related Documents,” on page 1-2
radio disassembly, then use a Torx driver and a T-6 bit to remove the four Torx screws shown
in
.
2. Lift the circuit board out of the radio chassis, then remove and discard the thermal pad
located between the circuit board and chassis.
3. After repairs, replace the thermal pad (Motorola P/N 7580556Z01) then reinstall the circuit
board into the radio chassis.
4. Reinstall and tighten the four Torx screws to secure the circuit board to the chassis.
5. Refer to the Basic Service Manual to reassemble the radio.
Figure 3-2. Circuit Board Removal and Reinstallation
3.9
Power Up Self-Test Error Codes
Turning on the radio starts a self-test routine that checks the RAM, ROM checksum, EEPROM
hardware and EEPROM checksum. If these checks are successful, the radio generates two
high-pitched self-test pass tones. If the self-test is not successful, one low-pitched tone is heard.
Radios with displays are able to display the error codes. The displayed error codes and related
corrections are as follows:
Table 3-2. Power Up Self-Test Error Codes
If the error code
displayed is ...
Then, there is
a ...
To correct the problem ...
“RAM TST ERROR”
RAM test failure.
retest the radio by turning it off and turning it on again. If
message reoccurs, replace RAM (U405).
“ROM CS ERROR”
wrong ROM checksum.
replace ROM (U406).
“EEPRM HW ERROR”
codeplug structure
mismatch or non
existence of
codeplug.
reprogram codeplug with correct version and retest radio. If
message reoccurs, replace EEPROM (U407).
“EEPRM CS ERROR”
wrong codeplug
checksum.
reprogram codeplug.
L400
R421
TP405
VR434
VR450
CR413
Q417
3
4
TP406
J403
20
22
C441
C491
C492
C490
C493
C494
C495
C496
C497
R477
R450
21
1
C471
C472
C473
L401
TP410
VR447
VR449
C443
40
R435
TP401
TP402
C427
C444
C428
RT400
85
4
1
U407
J400
C423
E407
E408
E409
R418
R437
R410
SH400
8
21
U405
1
7
22
C426 C425
C429
C424
R408
R492
R429
R478
R428
1
16
U406
17
32
PB503
3
FL201
B503
C432
SH201
TP201
C220
C229
C217
C228
L201
L203
C260
C294
C235
C291
L202
U247
C203
Q210
3
4
R256
R255
C210
C211
C212
C213
C214
C230
C292
C233
C238
C297
L232
Q260
3
4
C257
CR201
C251
C289
C253
Q261
3
4
R260
SH241
C247
C285
C248
C286
L282
Q241
R243
R248
R253
C273
3
L243
C370
C276
C271
C272
L273
3
L253
L271
C374
C386
L321
R333
R339
C122
C125
C165
C161
C129
C169
L114
L115
L113
R161
9
16
C109
C110
C114
C166
C111
C112
C113
C131
L106
L107
3
2
Q110
C119
C171
L108
R103
R104
R120
R171
R173
U101
8
1
C118
C121
C160
C115
C117
C116
C120
C127
L109
L160
R106
R107
R108
SH101
TP202
TP302
C375
C320
C319
L309
R348
T302
3
4
6
C381
C322
L310
R309
R308
R310
SH303
T301
3
4
6
C324
C323
L311
C325
FL301
R351
R352
SH323
B504
C397
PB504
R300
VR444
C328
C391
R326
R314
R316
R325
R334
R335
R338
RT301
VR300
Q315
Q316
R318
R319
R327
RT300
C331
C396
C333
CR308
R317
R336
R342
C104
C103
C106
C107
CR102
L102
L104
SH100
C101
C102
CR101
L101
L105
C140
C141
L116
C520
PB505
VR443
C302
C301
CR301
L301
C308
C303
C304
C305
CR302
L302
R301
R302
SH301
C512
C384
C385
C364
C351
C349
C350
C352
C353
C354
L325
Q320
R355
R322
R345
R320
R324
R346
C362
C363
CR310
L332
R321
SH321
C521
PB501
VR440
C505
C502
R507
VR501
Q505
R506
C513
Q502
R505
C511
C514
CR503
2
3
4
R502
R501
PB502
TP415
C401
C400
CR412
Q400
R401
R402
R403
R405
R406
R407
R427
R476
U400
8
5
C402
C467
C403
CR440
Q405
3
4
R416
R481
R446
4
C482
C480
Q403
R447
R448
SH401
T-6 Torx screw locations
Radio
chassis
Содержание PR860
Страница 1: ...PR860 Two Way Portable Radio Detailed Service Manual ...
Страница 2: ......
Страница 5: ...iv Notes ...
Страница 9: ...viii Table of Contents Notes ...
Страница 13: ...Notes xii List of Figures ...
Страница 17: ...1 4 Introduction Radio Model Information Notes ...
Страница 51: ...2 34 Theory of Operation Voltage Control Oscillators VCO Notes ...
Страница 81: ...4 4 Schematic Diagrams Overlays and Parts Lists Flex Layout Notes ...
Страница 193: ...4 116 Schematic Diagrams Overlays and Parts Lists Low Band Section Notes ...
Страница 196: ......