Vocon Tx Audio; Transmitter - Motorola ASTRO XTS 5000 Detailed Service Manual

Troubleshooting Charts: VOCON TX Audio
5.12 VOCON TX Audio—Page 1
Radio has no
Transmitter Deviation
(VOCON Evaluation)
Inspect
Microphone and
Flex Connector
Connections
OK?
Yes
Connect an
RLN4460A audio
test box (or equivalent)
to the radio side
connector
Inject a 200 mV
rms 1.0 kHz tone
to the test box
Audio In port
Is FM
deviation approx.
3.0 kHz?
No
Probe Voltage
at U509, pin 5
Is
1 kHz Signal
present at approx.
14 mV rms?
Yes
1
6881094C31-C
Repair connections
No
and/or replace flex
and microphone
No Problem
Yes
found.
End
Verify Integrity
No
of Mic path up
to U509
Problem
Yes
with Mic path
components?
No
2
MAEPF-27396-O
5-19
Replace
appropriate
component
October 14, 2003