Motorola HT Series

Maintenance: Low Band Troubleshooting Charts 8-39
8.13.4 Troubleshooting Flow Chart for Transmitter
START
No Power
Is Current ~
2 A?
Is control voltage at
U101 Pin 1 > 5
VDC
Check PCIC
1. Check Pin Diodes
2. Check Harmonic Filter
3. Check PA Bias
Inspect/Repair Tx. Out-
put Network
Is Power
OK?
Done
Check input to
U101, Pin 16
Is voltage
> 1 Vpp?
Troubleshoot
VCO
Check level
U101, Pin 6
Is level
>5 Vpp?
Is Power
OK?
Replace
Q101
Ye s
No
No
Ye s
No
Ye s
No
Ye s
Ye s
No
Ye s
No
Check components
around U101
Is Power
OK?
Done
Replace
U101
No
Check components
around Q100
Ye s
Done