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?
Summary of Contents for APX 7500
Page 1: ...APX TWO WAYRADIOS APX 7500 MULTI BAND CONSOLETTE DETAILED SERVICE MANUAL ...
Page 4: ...Notes ...
Page 96: ...September 9 2011 68009482001 4 26 Feature Operation Emergency Notes ...
Page 163: ......
Page 164: ......