Troubleshooting Flow Chart For Transmitter - Motorola Professional Radio Service Manual

3-24
Yes
1. Check Pin Diodes
2. Check Harmonic Filter
3. Check PA Bias
Inspect/Repair Tx.
Output Network
Is Power
OK?
Yes
Done

Troubleshooting Flow Chart for Transmitter

START
No Power
No
Is Current
~ 2 A?
No
Check components
around Q100
Is Power
OK?
Done
Is control voltage
at U101 Pin 1 > 5
Yes
Check input to
U101, Pin 16
Is voltage
> 1 Vpp?
Yes
Check level
U101, Pin 6
Yes
Is level
>5 Vpp?
No
Replace
Q101
Yes
Low Band Troubleshooting Charts
No
Check PCIC
No
Troubleshoot
VCO
No
Check components
around U101
No
Replace
Is Power
U101
OK?
Yes
Done