September 9, 2011 68009482001
7-14 Troubleshooting Charts and Error Codes Troubleshooting Charts
Figure 7-12. APCO RX Audio - B
Is there a 1kHz,
~300mVrms tone at
R2832?
Verify R2830, R2831, C1871,
C1872, U1802, C1851 & R2832
are placed properly & the
resistor values are correct
Is ~1.35Vdc
present at U1802-10 &
~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 is being routed
properly from R2832 through the
flex cable & low speed board to
J104-4.
~300mVrms tone present
No
No
Yes
Yes
Yes
No
Is there continuity
between R2832 on the
Mainboard & J104-4 on the
low speed board?
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