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Two-Way Radio
Professional GP340
Service manual
Transmitter - Motorola Professional GP340 Service Manual
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
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Transmitter
3.0
Transmitter
Yes
1. Check Pin Diodes
2. Check Harmonic Filter
3. Check PA Bias
Inspect/Repair Tx.
Output Network
Is Power
OK?
Yes
Done
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
VDC
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
No
Check PCIC
No
Troubleshoot
VCO
No
Check components
around U101
No
Is Power
OK?
Yes
Done
3-3
Replace
U101
Table of
Contents
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Chapters
Table of Contents
15
Pcb/Schematics/Parts Lists
37
Table of Contents
63
Table of Contents
81
Table of Contents
97
Table of Contents
149
Table of Contents
257
Table of Contents
Troubleshooting
Chapter 3 TROUBLESHOOTING CHARTS
31
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
32
Troubleshooting Flow Chart for Transmitter
33
Troubleshooting Flow Chart for Synthesizer
34
Troubleshooting Flow Chart for VCO
35
Troubleshooting Chart
84
Chapter 3 TROUBLESHOOTING CHARTS
171
Troubleshooting Flow Chart for Receiver for all models except those with PCB 8486473Z04
172
Troubleshooting Flow Chart for Receiver for models with PCB 8486473Z04
174
Troubleshooting Flow Chart for Transmitter
175
Troubleshooting Flow Chart for Synthesizer
176
Troubleshooting Flow Chart for VCO
177
Troubleshooting Flow Chart for Receive Message/Personal Memo Recording
178
Troubleshooting Flow Chart for Message Playback
179
Chapter 3 TROUBLESHOOTING CHARTS
271
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