Motorola APX 7500 Detailed Service Manual page 141

Troubleshooting Charts and Error Codes Troubleshooting Charts
Verify the "Wireline Configuration" in the
Consolette Configuration is set to 600 Ohm.
Connect a 600 Ohm load across Wireline
Connector pins LINE1+ (J21-3) & LINE1- (J21-6).
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,
~310mVrms tone at R1852
on the Mainboard?
Yes
Using the Wireline Out (RX) Gain
Setting in the Consolette Configuration, can
the audio level across J21-3 & J21-6 be
adjusted to ~775mVrms?
Yes
STOP
Figure 7-23. Wireline RX Audio - A
68009482001
No
Is the APX7500 mobile
operating properly?
Yes
Is the RX Codec Adjustment
in the Consolette Configuration
properly tuned?
Yes
Reprogram/Replace
Consolette Mainboard.
Is there a 1kHz,
No
~165mVrms tone at
R2851?
Yes
~165mVrms 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.
Verify C1849, U1818, C1881,
No
R1847, U1803, C1818 &
R2851 are placed properly.
Is ~1.35Vdc present at
U1818-3 & ~3.3Vdc present
at U1818-8 & U1803-1?
Yes
Replace U1818
and/or U1803.
7-25
There may be an issue
No
with the internal board
routing of VCC_1.35V
and/or VCC_3.3V.
September 9, 2011