Motorola XTS 2500 Service Manual page 258

6.4-20 700/800 MHz Troubleshooting Charts: VOCON Transmit Audio Troubleshooting Chart (2 of 2)
6.4.21VOCON Transmit Audio Troubleshooting Chart (2 of 2)
1
Check Mic
Bias line on
U701 for DC
Voltage
Voltage =
5.0V ?
Y es
Check signal on
R774 while still
applying audio
signal to radio
Yes
Data
present?
Y es
Check signal
on
CODEC_CLK
2
February 14, 2012
No
Replace
U701
No Replace
U701
2
No
Clock
present?
Y es
Check signal on
CODEC_FSYNC
No
Synchronous
pulses
present?
Y es
Replace
U800
MAEPF-27334-O
Replace
U701
Replace
U701
6816985H01-F