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.
No
Yes
Is Current
OK?
Output Network
No
Is Power
OK?
Yes
Done
Done
START
No Power
Is There
Yes
B+ Bias for
Ant switch
CR101
Is Control Voltage High
or Low at C119
Check Drive to
Module
Is Drive
OK?
Yes
Inspect PA Network/
Check Power Out of
U101 at Cap C160
Yes
Is Power
OK?
Done
No
Check Q111
Low
High
No
Troubleshoot VCO
No
Replace U101
Yes
Is Power
OK?
No
Replace Q110
3-3
Check PCIC