Removing And Reinstalling The Circuit Board; Power Up Self-Test Error Codes; Figure 3-2. Circuit Board Removal And Reinstallation - Motorola PR860 Detailed Service Manual

Maintenance: Removing and Reinstalling the Circuit Board
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
radio disassembly, then use a Torx driver and a T-6 bit to remove the four Torx screws shown
in Figure
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.
Radio
chassis
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:
If the error code
displayed is ...
"RAM TST ERROR"
"ROM CS ERROR"
"EEPRM HW ERROR"
"EEPRM CS ERROR"
3-2.
T-6 Torx screw locations
SH400 R410
E407
E409
R437 PB503
32 17
3
21
8
FL201
U405 TP201
J400
SH201
1 C220
7 22
L203
C426 C425
1
16
Q210
40 C429
R428
TP401
R478
C424
TP402 C427 C428 R408
C292
R435
C257 C211
C443 C444 RT400
TP410
SH401
SH241
Q261 C247 C248
C251
C473 Q403
C472
21
C471
C253
1 R481
C497 Q405
C467
C496
3 C402
4
C495
C494
C403
4 L253
C493
U400
C490 R407
R476
5 8
L273
R477
R427
3
C491
R401
C441
20
CR412
C492
R405
22
VR450
TP406 TP415
TP405

Figure 3-2. Circuit Board Removal and Reinstallation

Table 3-2. Power Up Self-Test Error Codes
Then, there is
a ...
RAM test failure.
wrong ROM checksum.
codeplug structure
mismatch or non
existence of
codeplug.
wrong codeplug
checksum.
Table 1-1, "Related Documents," on page
PB502 PB504
SH323 R300
R352
C397
R314 RT301 SH321 R321
FL301
C362
C328 R335
C325
R338
R325
C351
U247
L311 Q316
C349
R318 Q315
C260
C396
SH303
C333
R310
R255
4 TP302 L310 R317
R308
3
R256 C203 R336
T302
R348
L232
T301
TP202
C213
L309
C238
C273
SH101
R248 L282
C121
C115
L160
R103 2
Q241 C116
C160 R108
C119
Q110
3
L243 C117
C127 R173
8
U101 C171
1
3
9
16
L107
C112
C161 C109
C166
L114 L106
C131
C111
To correct the problem ...
retest the radio by turning it off and turning it on again. If
message reoccurs, replace RAM (U405).
replace ROM (U406).
reprogram codeplug with correct version and retest radio. If
message reoccurs, replace EEPROM (U407).
reprogram codeplug.
PB501
VR440 C521
CR310
VR501
C363
L332
L325
R506
C385
C353 C384
C352
R355
Q505
Q320
C350
R505
C512 C513
Q502
SH301
C304
L302
3 4
CR503
R302
2
R501
R301
VR443
C520
L301
C301
SH100
C107
L104
C140
L102 L101
C106
C102
CR101
C141
3-7
1-2) for