Troubleshooting Flow Chart For Transmitter - Motorola GP88s Service Manual

9B-52
Yes
1. Check Pin Diodes
2. Check Harmonic Filter
Inspect/Repair Tx.
Output Network
Is Power
OK?
Yes
Done

Troubleshooting Flow Chart for Transmitter

Yes
No
Is Current
OK?
No
Done
Done
START
No Power
Is There
No
B+ Bias for
Ant switch
D3521
Is
Control Voltage High or
Low at TP3502
High
Check Drive to
Module
Is Drive
OK?
Yes
Inspect PA Network/
Check Power Out of
U3501 at Cap C3512
Is Power
Yes
OK?
No
Replace U3501
Is Power
Yes
OK?
No
Replace Q3501
Troubleshooting Charts
Check
Q3561
Low
Check PCIC
No
Troubleshoot
VCO