
3-12
Maintenance:
UHF Troubleshooting Charts
START
No Power
Is There B+
Bias for Ant
switch
Check Q111
Is Current
OK?
Is Control Voltage
High or Low
Check
PCIC
1. Check Pin Diodes
2. Check Harmonic Filter
Inspect/Repair Tx.
Output Network
Is Power
OK?
Done
Check Drive
to Module
Is Drive
OK?
Troubleshoot
VCO
Inspect PA Network/
Check Power Out of
U101 at Cap C160
Is Power
OK?
Replace U101
Is Power
OK?
Replace Q101
Done
Done
No
Yes
Yes
No
No
Yes
Low
High
No
Yes
Yes
No
Yes
No
Troubleshooting Flow Chart for Transmitter
Содержание PR860
Страница 1: ...PR860 Two Way Portable Radio Detailed Service Manual ...
Страница 2: ......
Страница 5: ...iv Notes ...
Страница 9: ...viii Table of Contents Notes ...
Страница 13: ...Notes xii List of Figures ...
Страница 17: ...1 4 Introduction Radio Model Information Notes ...
Страница 51: ...2 34 Theory of Operation Voltage Control Oscillators VCO Notes ...
Страница 81: ...4 4 Schematic Diagrams Overlays and Parts Lists Flex Layout Notes ...
Страница 193: ...4 116 Schematic Diagrams Overlays and Parts Lists Low Band Section Notes ...
Страница 196: ......