Troubleshooting Chart For Transmitter - Motorola GP344 Detailed Service Manual

2-4
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
Figure 2-3 Troubleshooting Chart for Transmitter
START
No Power
No
Is There B+
Bias for Ant
switch
Is Control Voltage
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
OK?
Yes
No
Replace U101
Is Power
Yes
OK?
No
Replace Q101
TROUBLESHOOTING CHARTS
Check Q111
Low
Check PCIC
No
Troubleshoot
VCO