Removing And Reinstalling The Circuit Board; Power Up Self-Test Error Codes; Figure 4-2. Circuit Board Removal And Reinstallation - Motorola HT1250-LS+ Service Manual

4-6
4.8

Removing and Reinstalling the Circuit Board

Both the 200MHz and 700 MHz circuit boards are removed from the radio chassis in the following
manner:
1. Refer to the Basic Service Manual (see Chapter 1 - Related Documents) for radio disassembly,
then use a Torx driver and a T-6 bit to remove the four Torx screws shown in Figure 4-2.
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
4.9

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"
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
C427 C428 R408
TP402
C292
R435
C211
C257
C443
C444 RT400
TP410
SH401
SH241
Q261 C247 C248
C251
C473
Q403
C472
21
C471
C253
1 R481
C497 Q405
C467
C496
3 C402
C495 4
C494
4 C403 L253
C493
U400
R407
C490 R476
5 8
L273
R477
R427
3
C491
R401
C441
20
CR412
C492
R405
22
VR450
TP415
TP406
TP405

Figure 4-2. Circuit Board Removal and Reinstallation

Then, there is
a ...
RAM test failure.
wrong ROM
checksum.
codeplug structure
mismatch or non
existence of
codeplug.
wrong codeplug
checksum.
PB504
PB502
SH323
R300
R352
C397
RT301 SH321
R314 R321
FL301
C328 R335 C362
C325
R338
R325
C351
U247
Q316
L311
C349
Q315
R318
C260
C396
SH303
C333
R310
4 R255 TP302 R317
L310
3 R308
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
Maintenance