Motorola Professional GP640 Service Information - Page 23

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Motorola Professional GP640 Service Information

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
Low
High
No
Troubleshoot VCO
No
Replace U101
Yes
Is Power
OK?
No
Replace Q110
3-3
Check Q111
Check PCIC