Motorola PR860 Detailed Service Manual page 69

3-18
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
Maintenance: VHF Troubleshooting Charts
START
No Power
No
Is There B+
Bias for Ant
switch
Is Control Voltage
High or Low
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
Check
Q3561
Low
Check PCIC
No
Troubleshoot
VCO