September 9, 2011 68009482001
7-16 Troubleshooting Charts and Error Codes Troubleshooting Charts
Figure 7-14. Audio Jack RX - B
Is there a 1kHz,
~300mVrms tone at
R1885?
Verify R1883, R1884, C1823,
C1850, U1802, C1824 & R1885
are placed properly & the
resistor values are correct.
Is ~1.35Vdc
present at U1802-12 &
~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
Verify RX_AUDIO_BUFF is being
routed properly from R1885
through the flex cable & low
speed board to P100-2 & P100-3.
~300mVrms tone present
No
No
Yes
Yes
Yes
No
Is P100
connected properly to
the audio jack?
Make the proper connections
between P100 and the audio jack.
No
Yes
Is there continuity
between R1885 on the
Mainboard and P100-2 & P100-3
on the low speed board?
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