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Radio
GP series
Detailed service manual
Troubleshooting Flow Chart For Vco - Motorola GP Series Detailed Service Manual
Professional portable radio uhf 800mhz dsm
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:
Service manual
(300 pages)
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Service information
(108 pages)
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Manual
(30 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Advertisement
2-8
8.0
Troubleshooting Flow Chart for VCO
Check R245
No
for dry joint
or faulty
A
U241
Pin 19 =0V
No
AUX 4
High?
No
Change
U201
U241
Pin 10
>1V?
Yes
Yes
L253
Open
Circuit?
No
Change
U241
Yes
Yes
Change
Q261
TRB =
Yes
5V? @U241
Pin 19
Change
L253
AUX 3
High?
Check U201
Pin 2 for 3.2V
VCTRL
Yes
0V or
13V?
No
Check for faulty
parts or dry joints of
L271, L273, C370,
C386, R339 & L320
TROUBLESHOOTING CHARTS
START
Yes
No LO?
A
No
No
Carrier?
No
VCO OK
Yes
Check
R260
No
L243
Yes
Open
Circuit?
No
Change
U241
Tx
Yes
Change
L243
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15
Theory of Operation
35
Theory of Operation
61
Theory of Operation
111
Theory of Operation/Troubleshooting Charts
327
Theory of Operation/Troubleshooting Charts
443
Table of Contents
Troubleshooting
Troubleshooting Chart
38
Troubleshooting Flow Chart for Controller
135
Troubleshooting Flow Chart for Receiver (All models except those with PCB 8486458Z03) (Sheet 1 of 2)
136
Troubleshooting Flow Chart for Receiver (Models with PCB 8486458Z03) (Sheet 1 of 2)
138
Troubleshooting Flow Chart for Receiver (Models with PCB 8486458Z03) (Sheet 2 of 2)
139
Troubleshooting Flow Chart for Transmitter
140
Troubleshooting Flow Chart for Synthesizer
141
Troubleshooting Flow Chart for VCO
142
Troubleshooting Flow Chart for Receive Message/Personal Memo Recording
143
Troubleshooting Flow Chart for Message Playback
144
Chapter 2 TROUBLESHOOTING CHARTS
343
Troubleshooting Flow Chart for Receiver (All models except those with PCB 8486686Z02)(Sheet 2 of 2)
344
Troubleshooting Flow Chart for Receiver (Models with PCB 8486686Z02) (Sheet 2 of 2)
346
Troubleshooting Flow Chart for Transmitter
347
Troubleshooting Flow Chart for Synthesizer
348
Troubleshooting Flow Chart for VCO
349
Troubleshooting Flow Chart for Receive Message/Personal Memo Recording
350
Troubleshooting Flow Chart for Message Playback
351
Chapter 2 TROUBLESHOOTING CHARTS
457
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
458
Troubleshooting Flow Chart for Transmitter
459
Troubleshooting Flow Chart for Synthesizer
460
Troubleshooting Flow Chart for VCO
461
Troubleshooting Flow Chart for PassPort Trunking
462
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