Motorola APX 7500 Detailed Service Manual page 135

Multi-bandconsolette detailed serv
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Troubleshooting Charts and Error Codes Troubleshooting Charts
Verify "Public Address Amplifier Audio" is set
to Output RX only in the Audio Parameters of
the Consolette Configuration.
Apply an on-channel signal at -47dBm,
modulated by a 1kHz tone at 60% rated
system deviation, to the Consolette receiver.
Is there a 1kHz,
~300 mVrms tone at the
Accessory 1 Connector
(J104-8)?
Yes
STOP
Figure 7-17. External PA RX Audio - A
68009482001
No
Is the APX7500 mobile
operating properly?
Yes
Is the RX Codec Adjustment
in the Consolette Configuration
properly tuned?
Yes
Is there a 1kHz,
~300mVrms tone at U1815-
6 on the Consolette
Mainboard?
Yes
Is there a 1kHz,
~300mVrms tone at
R2824?
Yes
~300mVrms tone present
Refer to the APX7500
Detailed Service
No
Manual for correct
operation and
troubleshooting.
Refer to the "Receive
Audio Tuning –
RX_AUDIO" section of
the manual.
No
Reprogram/Replace Consolette
Mainboard.
Verify R2827, U1815,
No
C1858, R2807, R2806,
C1886, Q1807 & C1859 are
placed properly.
Is ~3.3Vdc
present at
U1815-2?
Yes
Does U1815-1
measure ~2.8Vdc?
Yes
Replace U1815.
There may be an issue with the
No
internal board routing of
VCC_3.3V.
Reprogram/Replace Consolette
No
Mainboard.
September 9, 2011
7-19

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