Motorola GP series

Troubleshooting Flow Chart for Transmitter 3-5
3.0 Troubleshooting Flow Chart for Transmitter
Is
Control Voltage High
or Low at TP3502
?
Is
There
B+ Bias for
Ant switch
D3521
?
START
No Power
Check Q3561
Is
Current
OK?
Check PCIC
1. Check Pin Diodes
2. Check Harmonic Filter
Inspect/Repair Tx.
Output Network
Is
Power
OK?
Done
Check Drive to
Module
Is Drive
OK
?
Troubleshoot VCO
Inspect PA Network/
Check Power Out of
U3501 at Cap C3512
Is
Power
OK?
Replace U3501
Is
Power OK
?
Replace Q3501
Done
Done
No
Yes
Yes
No
No
Yes
Low
High
No
Yes
Yes
No
Yes
No