Motorola APX 7500 Detailed Service Manual page 143

Troubleshooting Charts and Error Codes Troubleshooting Charts
Verify the "Wireline Configuration" in the
Consolette Configuration is set to 2-wire and
600 Ohm and "TRC AGC Configuration" is set
to Disabled. Also verify "Wireline Function" is
set to Hardware PTT in the Audio Parameters
of the Consolette Configuration
Inject a 1kHz, 1.55Vrms tone from a 600 Ohm
source across Wireline Connector's LINE1+
(J21-3) and LINE1- (J21-6). Short Accessory
Connector's PTT* (J104-10) to ground.
Does the
Consolette key up and
begin transmitting?
Yes
Is the Consolette
TX dev. 60% of rated
system deviation?
Yes
STOP
Figure 7-25. 2-Wire Wireline TX Audio - A
68009482001
No
Is the APX7500 mobile
operating properly?
Yes
Does U1809-16 on the
Consolette Mainboard
measure ~0Vdc (GND)?
Yes
Reprogram/Replace
Consolette Mainboard.
No
Is the APX7500 mobile
operating properly?
Yes
Is the Wireline In (TX) Gain
Setting in the Consolette
Configuration properly tuned?
Yes
Is there a 1kHz, ~90mVrms
tone at U1801-14 on the
Consolette Mainboard?
Yes
Reprogram/Replace
Consolette Mainboard.
Refer to the APX7500
Detailed Service
No
Manual for correct
operation and
troubleshooting.
Does U1809-4
No
measure ~0Vdc
(GND)?
Yes
Replace U1809.
Refer to the APX7500
Detailed Service
No
Manual for correct
operation and
troubleshooting.
Refer to the "Transmit
No
Audio Tuning - Wireline"
section of the manual.
Is there a 1kHz,
No
~450mVrms tone at
R1836?
Yes
Verify C1828, C1852, R2850,
R2849, C1877, C1878 & U1801
are placed properly & the
resistor values are correct.
Is ~1.35Vdc
No
present at U1801-12 &
~3.3Vdc present at
U1801-4?
Yes
Replace U1801.
Verify PTT* (J104-10) is
being routed properly
No
through the low speed
board & flex cable to
U1809-4.
No
~450mVrms tone not
present at R1836
There may be an issue with the
internal board routing of
VCC_1.35V and/or VCC_3.3V.
September 9, 2011
7-27