Motorola APX 7500 Detailed Service Manual page 139

Troubleshooting Charts and Error Codes Troubleshooting Charts
Verify "Recorder Configuration" is set to
Record 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 Recorder
Connector (J23-1)?
Yes
STOP
Figure 7-21. Recorder 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 U1813-
6 on the Consolette
Mainboard?
Yes
Is there a 1kHz,
~300mVrms tone at
R2834?
Yes
~300mVrms tone present
Refer to the APX7500
Detailed Service
No
Manual for correct
operation and
troubleshooting.
Refer to the "Receive
–
No
Audio Tuning
RX_AUDIO" section of
the manual.
No
Reprogram/Replace Consolette
Mainboard.
Verify R1896, U1813,
No
C1855, R1894, R1893,
C1885, Q1806 & C1856 are
placed properly.
Is ~3.3Vdc
present at
U1813-2?
Yes
Does U1813-1
measure ~2.8Vdc?
Yes
Replace U1813.
There may be an issue with the
No
internal board routing of
VCC_3.3V.
Reprogram/Replace Consolette
No
Mainboard.
September 9, 2011
7-23