Motorola HT1250-LS+ Service Manual page 45

Maintenance
B
B
Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)
START
Bad SINAD
Bad 20dB Quieting
No Recovered Audio
Audio at pin 8
of U3101?
No
Induce or inject 1st IF into
XTAL Filter
IF Freq: 44.85 MHz
Yes
Audio heard?
No
Check 2nd Voltage at
U3101 Pin 4
Level
Yes
approx. +6
dBm?
No
Check Y3200. If OK
check/replace U3101
Yes
Check Controller
4-9