Motorola ASTRO XTS 5000 - Page 118

6881094C31-E November 16, 2006
Troubleshooting Charts: VCO TX/RX Unlock 5-27
VOCON TX Audio (for kit NNTN5567)—Page 2
1
Voltage = 5.0
V?
No
Data present?
No
Yes
Yes
Yes
Clock
present?
No
Yes
2
2
Synchronous
pulses
present?
No
Yes
Replace U401
Replace U501
Replace U501
Replace U501
Check signal on
R406
Check Mic_Bias
Line on U501 for
DC Voltage
Replace U501
Check signal on
R405
Check signal on
U408 pin 1 while
still applying
audio signal to
radio