Troubleshooting Flow Chart For Transmitter - Motorola HT Series Service Manual

Maintenance: UHF Band 1 Troubleshooting Charts

8.10.7 Troubleshooting Flow Chart for Transmitter

Yes
1. Check Pin Diodes
2. Check Harmonic Filter
Inspect/Repair Tx
Output Network
Is Power
OK?
Yes
Done
Yes
No
Is Current
OK?
No
Done
Done
START
No Power
No
Is There B+
Bias for Ant
switch
Is Control Volt-
age High or Low
High
Check Drive to
Module
Is Drive
OK?
Yes
Inspect PA Network/
Check Power Out of
U101 at Cap C160
Is Power
Yes
OK?
No
Replace U101
Is Power
Yes
OK?
No
Replace Q101
Check Q111
Low
Check PCIC
No
Troubleshoot
VCO
8-15