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Service information
Troubleshooting Flow Chart For Synthesizer - Motorola GP Series Service Information
Professional radio, vhf 136-174mhz
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Also See for GP Series
:
Detailed service manual
(494 pages)
,
Service manual
(300 pages)
,
Service information
(43 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
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3-6
4.0
Troubleshooting Flow Chart for Synthesizer
Check D3701,
D3702, U3701,
Problem
C3701 - C3707
YES
5V
NO
Is U3701
at pin 6 of
Pin47 AT = 13
D3701
NO
Check
L3701,
R3701
Is
U3701
Pin 19<0.7 VDC
in RX & >4.3 VDC
in TX?
YES
Is
U3701 Pin
18 AT 4.54
VDC?
YES
Is RF level at
U3701 Pin 32
>-30 dBm?
YES
Are
C3721,
C3722,C3723,
R3721, R3722,
R3723
OK?
YES
Replace
U3701
NO
Correct
VDC
YES
Check Q260,
Q261 & R260
NO
U3701
YES
pin 2 at >3V
in Tx and
<0.7V in
Rx
NO
NO
Replace
If R3727, C3726 & C3727
NO
are OK, then see VCO
troubleshooting chart
Replace or
NO
resolder
necessary
components
Start
Visual
check of the
Board
OK?
YES
YES
+5V
NO
at U3701
Pin's
13 & 30?
Check 5V
Regulator
Are
NO
signals at
Pin's 14 &15
of U3701
?
YES
Is
there a short
NO
between Pin 47 and
Pins 14 & 15 of
U3701?
YES
Remove
Shorts
TROUBLESHOOTING CHARTS
3.3V
NO
at U3701
Check
pins 5, 20,
U3201,
34 & 36
L3731
YES
Is
16.8MHz
16.8MHz
NO
signal at
Signal at
U3701 pin
U3701 Pin
19?
YES
Check Y3761,
C3761, C3762,
C3763, D3761 &
R3761
Are
Waveforms
NO
at Pins 14 & 15
triangular?
YES
Pins 7,8 & 9
NO
of U3701 toggle
when channel
is changed
Check prgramming
lines between U409
and U3701
Pins 7,8 & 9
NO
information
from mP U409
Check uP U409
Troubleshooting
Chart
Replace
U3701
Is
YES
Replace
U3701
23?
NO
Do
?
YES
Is
correct
?
YES
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Quick Links:
Gp320/Gp340/Gp360/Gp380 Model Chart
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Technical Specifications
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Table of Contents
Troubleshooting
TROUBLESHOOTING CHARTS
25
Troubleshooting Flow Chart for Receiver for all models except those with PCB 8486473Z04
26
Troubleshooting Flow Chart for Receiver for models with PCB 8486473Z04
28
Troubleshooting Flow Chart for Transmitter
29
Troubleshooting Flow Chart for Synthesizer
30
Troubleshooting Flow Chart for VCO
31
Troubleshooting Flow Chart for Receive Message/Personal Memo Recording
32
Troubleshooting Flow Chart for Message Playback
33
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This manual is also suitable for:
Gp320
Gp340
Gp360
Gp380
Gp140
Gp640
...
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Gp680
Gp1280
Gp240
Gp280
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Gp580
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