Motorola HT Series

8-56 Maintenance: 900 MHz Troubleshooting Charts
8.17.5 Troubleshooting Flow Chart for Receiver (for PCB No. 8471203M01)
(Sheet 1 of 2)
Bad SINAD
Bad 20dB Quieting
No Recovered Audio
START
Audio at
pin 8 of
U350?
Check Controller
Yes
No
Induce or inject 1st IF into XTAL
Filter
IF Freq: 73.35 MHz
Audio heard?
B
Yes
No
Check 2nd Voltage at
U350 Pin 4
Level Approx.
+6 dBm?
B
Yes
No
Check Y350. If OK, check/
replace U350.