Motorola GP1280 Series Service Information - Page 25
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Troubleshooting Flow Chart for Transmitter
3.0
Troubleshooting Flow Chart for Transmitter
1. Check Pin Diodes
2. Check Harmonic Filter
Inspect/Repair Tx.
Is
No
Yes
Current
OK?
Output Network
Is
No
Power
OK?
Yes
Done
Done
START
No Power
Is
There
Yes
B+ Bias for
Ant switch
D3521
?
Is
Control Voltage High
or Low at TP3502
?
Check Drive to
Module
Is Drive
OK
?
Yes
Inspect PA Network/
Check Power Out of
U3501 at Cap C3512
Yes
Is
Power
OK?
Done
No
Check Q3561
Low
High
No
Troubleshoot VCO
No
Replace U3501
Yes
Is
Power OK
?
No
Replace Q3501
3-3
Check PCIC