September 9, 2011 68009482001
7-20 Troubleshooting Charts and Error Codes Troubleshooting Charts
Figure 7-18. External PA RX Audio - B
Is there a 1kHz,
~300mVrms tone at
R2826?
Verify R2824, R2825, C1866,
C1880, C1867, U1802, C1868
& R2826 are placed properly &
the resistor values are correct.
Is ~1.35Vdc
present at U1802-3 &
~3.3Vdc present at
U1802-4?
There may be an issue with the
internal board routing of
VCC_1.35V and/or VCC_3.3V.
Replace U1802.
STOP
~300mVrms tone present
No
No
Yes
Yes
Yes
No
Verify EXT_PA_AUDIO is being
routed properly from R2826
through the flex cable & low
speed board to J104-8.
Is there continuity
between R2826 on the
Mainboard & J104-8 on the
low speed board?
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