Motorola APX 7500 Detailed Service Manual page 125

Troubleshooting Charts and Error Codes Troubleshooting Charts
SWB+ present at Q1306-2
Figure 7-7. Controller Board DC Voltages - C
68009482001
9.6V_AA
Is 9.6V
No
present at
R2301?
Yes
4.8V_AA
Is 4.8V
No
present at
R2323?
Yes
STOP
4.8V_BIAS
Is 4.8V
No
present at
R1351?
Yes
STOP
Verify 0 Ohm jumper R2301 is placed properly.
Verify R1340 is placed & measures 33.2K.
Verify R2300 is placed & measures 4.75K.
Check/Replace Voltage Regulator U1320.
Verify 0 Ohm jumper R2323 is placed properly.
Verify R2302 is placed & measures 10K.
Verify R2303 is placed & measures 10K.
Verify 0 Ohm jumper R1351 is placed properly.
Verify R1349 is placed & measures 33.2K.
Verify R1350 is placed & measures 11K.
Check/Replace Voltage Regulator U1306.
September 9, 2011
7-9