Motorola APX 7500 Detailed Service Manual page 154

7-38
Inject a 1kHz, 80 mVrms
tone from a 50 Ohm source
into Headset 2 Connector's
HDST2_MIC+ (J12-5) &
short HDST2_PTT* (J12-6)
to ground.
Does the
No
Consolette key up and
begin transmitting?
Yes
Is the Consolette
No
TX dev. 60% of rated
system deviation?
Yes
STOP
September 9, 2011
Troubleshooting Charts and Error Codes Troubleshooting Charts
No
Is the APX7500 mobile
operating properly?
Yes
Does U1809-12 on the
No
Consolette Mainboard
measure ~0Vdc (GND)?
Yes
Reprogram/Replace
Consolette Mainboard.
No
Is the APX7500 mobile
operating properly?
Yes
Is the Headset Mic
No
(TX) Gain Setting in the
Consolette Configuration
properly tuned?
Yes
Verify R1810, R1809, C1813,
Is there a 1kHz,
No
~20mVrms tone at U1801-
placed properly & the resistor
1 on the Consolette
Mainboard?
Yes
Reprogram/Replace
Consolette Mainboard.
Refer to the APX7500
Detailed Service
Manual for correct
operation and
troubleshooting.
Does U1809-8 (J12-6) is being routed
No
measure ~0Vdc
(GND)? high speed board & flex
Yes
Replace U1809.
Refer to the APX7500
Detailed Service
Manual for correct
operation and
troubleshooting.
Refer to the "Transmit
Audio Tuning -
Headsets" section of the
manual.
C1814, C1815 & U1801 are
values are correct.
Is ~1.35Vdc There may be an issue
No
present at U1801-3 & with the internal board
~3.3Vdc present at routing of VCC_1.35V
U1801-4?
Yes
Is there a 1kHz,
No
~40mVrms tone at
R2855?
Yes
Replace U1801.
Verify E1801, R2853, R2854, C1887
& C1888 are placed properly & the
resistor values are correct.
Figure 7-36. Headset 2 TX Audio
Verify HDST2_PTT*
properly through the
cable to U1809-8.
and/or VCC_3.3V.
HDST2_MIC+
Continuity
(J12-5) is being
between J12-5 on the
No
routed properly
high speed board &
through the high
C1888 on the
speed board &
Mainboard?
flex cable to
Yes
68009482001
Verify
C1888.