Motorola APX 7500 Detailed Service Manual page 126

7-10
VCC_5V present at U1300-1
September 9, 2011
Troubleshooting Charts and Error Codes Troubleshooting Charts
VCC_3.3V
Is 3.3V
No
present at
R1332?
Yes
VCC_1.35V
Is 1.35V
No
present at
R2320?
Yes
STOP
VCC_2.8V
Is 2.8V
No
present at
R1335?
Yes
STOP
VCC_1.8V
Is 1.8V
No
present at
R1369?
Yes
STOP
VCC_1.6V
Is 1.6V
No
present at
R1334?
Yes
STOP
VCC_2.85V
Is 2.85V
No
present at
R1345?
Yes
STOP
VCC_NAUT_1.5V
Is 1.5V
No
present at
R1358?
Yes
STOP
Figure 7-8. Controller Board DC Voltages - D
Verify 0 Ohm jumper R1332 is placed properly.
Check/Replace PCIC U1301.
Verify 0 Ohm jumper R2320 is placed properly.
Verify R1394 is placed & measures 15K.
Verify R1395 is placed & measures 10.2K.
Verify 0 Ohm jumper R1335 is placed properly.
Check/Replace PCIC U1301.
Verify 0 Ohm jumper R1369 is placed properly.
Check/Replace PCIC U1301.
Verify 0 Ohm jumper R1334 is placed properly.
Check/Replace PCIC U1301.
Verify 0 Ohm jumper R1345 is placed properly.
Verify R1343 is placed & measures 10.2K.
Verify R1344 is placed & measures 13.7K.
Check/Replace Voltage Regulator U1304.
Verify 0 Ohm jumper R1358 is placed properly.
Verify R1356 is placed & measures 15K.
Verify R1357 is placed & measures 2K.
Check/Replace Voltage Regulator U1307.
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