Motorola APX 7500 Detailed Service Manual page 152

7-36
Parts placed properly
Is ~1.35Vdc
present at U1801-5 &
~3.3Vdc present at
U1801-4?
Yes
Is there a 1kHz,
~145mVrms tone at
R1808?
Yes
Replace U1801.
September 9, 2011
Troubleshooting Charts and Error Codes Troubleshooting Charts
There may be an issue with the
No
internal board routing of
VCC_1.35V and/or VCC_3.3V.
Is there continuity
No
between J24-8 on the high
speed board & C1804 on
the Mainboard?
Verify R1802 & C1804
are placed properly &
the R1802 resistor
value is 560 Ohms.
(J24-8) is being routed
No
high speed board & flex
Yes
Figure 7-34. Crosspatch TX Audio - B
Verify CP_AUX_TX
properly through the
cable to C1804.
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