Motorola XTS 2500 Service Manual page 183

VHF Troubleshooting Charts: VOCON Receive Audio Troubleshooting Chart
6.1.18VOCON Receive Audio Troubleshooting Chart
Bad SINAD
No
Recovered
Audio
Check speaker
integrity
Connections
OK?
Y es
Connect an RLN4460
test box (or equivalent)
to the radio side
connector via a
programming cable
Inject Standard
Input into antenna
connector
Audio
present?
No
1
6816985H01-F
No
Replace
Speaker
A standard input is an RF
signal at -47 dBm with a 1
kHz tone modulated at 3
kHz for a 25kHz channel
Check
Y e s
distortion of
signal at R844
and/or R798
1
Check Rx SAP
port signal
integrity as per
Chapter 7
No
Connections
OK?
Y es
Replace
U800
Y es
Replace
THD < 2 %
No
Check
contacts at
J650
MAEPF-27347-O
6.1-17
Replace
U701
U701
February 14, 2012