Troubleshooting Flow Chart for Synthesizer
3-7
3.0
Troubleshooting Flow Chart for Synthesizer
5V
at pin 6 of
D200
Is
information
from
u
P U403
correct
?
Is
U200 Pin 47
at = 14.6VDC
?
Is
U201 Pin 19
<40 mVDC in RX &
>4.5 VDC in TX?
(at VCO section)
?
Start
Visual
check of the
Board
OK?
Correct
Problem
Check 5V
Reg ulator
U503
+5V
at U200
Pin’s
13 & 30
?
Is
16.8MHz
Signal at U200
Pin 19
?
Check
Y201 and associated
Parts
Are
signals
at Pin’s 14 &15
of U200
?
Check
R228
Check R201
Is
U200
Pin 2 >4.5 VDC in
Tx & <40 mVDC
in Rx
?
Replace U200
Remove
Shorts
Is
there a short
between Pin 47 and
Pins 14 & 15 of
U200
?
Is
RF level at
U200 Pin 32
-12 < x <-25
dBm
?
Replace U200
Are
Waveforms
at Pins 14 & 15
triangular
?
Do
Pins 7,8 & 9
of U200 toggle
when channel is
changed?
Check programming
lines between
U403 and U200
Pins 7,8 & 9
Replace U200
Check uP U403
Troubleshooting
Chart
NO
YES
NO
YES
NO
YES
NO
NO
NO
YES
YES
YES
NO
YES
YES
YES
NO
NO
NO
NO
YES
NO
YES
YES
Check D200, D201,
C2026, C2025, &
C2027
3.3V
at U200
pins 5, 20, 34
& 36
Check 3V
Regulator
U503
Is
16.8MHz
signal at
U200 Pin
23?
Replace
U200
YES
NO
NO
YES
NO
YES
If C2052, R208,C2067,
C2068, L210 are OK, then
see VCO
troubleshooting chart
Summary of Contents for cm200 Commercial Series
Page 1: ......
Page 2: ......
Page 3: ...M CM200 CM300 PM400 Radios Detailed Service Manual 6881098C00 A ...
Page 6: ...THIS PAGE INTENTIONALLY LEFT BLANK Notes ...
Page 7: ...CM200 CM300 PM400 Radios Service Maintainability Issue November 2007 M ...
Page 10: ...iv Notes ...
Page 12: ...vi Notes ...
Page 16: ...1 4 INTRODUCTION Notes ...
Page 24: ...2 8 MAINTENANCE Notes ...
Page 27: ...CM200 CM300 PM400 Radios Control Head Service Information Issue November 2007 M ...
Page 32: ...1 2 OVERVIEW Notes ...
Page 46: ...4 2 CONTROLHEAD PCB SCHEMATICS PARTS LISTS Notes ...
Page 53: ...CM200 CM300 PM400 Radios UHF2 438 470 MHz 1 25 W Service Information Issue November 2007 M ...
Page 58: ...vi Notes ...
Page 62: ...1 4 MODEL CHART AND TECHNICAL SPECIFICATIONS Notes ...
Page 96: ...4 2 UHF2 PCB SCHEMATICS PARTS LISTS Notes ...
Page 151: ...CM200 CM300 PM400 Radios UHF2 438 470 MHz 25 40 W Service Information Issue November 2007 M ...
Page 156: ...vi Notes ...
Page 160: ...1 4 MODEL CHART AND TECHNICAL SPECIFICATIONS Notes ...
Page 194: ...4 2 UHF2 PCB SCHEMATICS PARTS LISTS Notes ...
Page 222: ...4 30 UHF 25 40 W Band 2 PCB 8486577Z01 Schematics Notes ...
Page 250: ...4 58 UHF 25 40 W Band 2 PCB 8486577Z03 Schematics Notes ...
Page 251: ...CM200 CM300 PM400 Radios UHF3 465 495 MHz 25 40 W Service Information Issue November 2007 M ...
Page 256: ...vi Notes ...
Page 260: ...1 4 MODEL CHART AND TECHNICAL SPECIFICATIONS Notes ...
Page 294: ...4 2 UHF3 PCB SCHEMATICS PARTS LISTS Notes ...
Page 322: ...4 30 UHF 25 40 W Band 3 PCB 8486577Z01 Schematics Notes ...
Page 350: ...4 58 UHF 25 40 W Band 3 PCB 8486577Z03 Schematics Notes ...
Page 351: ......
Page 352: ......