Troubleshooting Flow Chart for Synthesizer
3-7
4.0
Troubleshooting Flow Chart for Synthesizer
5V
at pin 6 of
D4201
Is
information
from
m
P U0101
correct
?
Is
U4201 Pin 47
at = 13VDC
?
Is
U4301 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
R e g u l a t o r
U4211
+5V
at U4201
Pin’s
13 & 30
?
Is
16.8MHz
Signal at U4201
Pin 19
?
Check
Y4261 / Y4262 and
associated Parts
Are
signals
at Pin’s 14 &15
of U4201
?
Check
R4201
Check C4381
Is
U4201
Pin 2 >4.5 VDC in
Tx & <40 mVDC
in Rx
?
Replace
U4201
Remove
Shorts
Is
there a short
between Pin 47 and
Pins 14 & 15 of
U4201
?
Replace or
resolder
necessary
components
Is
RF level at
U4201 Pin 32
-12 < x <-25
dBm
?
Are
R4221,R4222,
R4223,C4221,
C4222,& C4223
OK?
Replace
U4201
If L4225, C4229 & C4227
are OK, then see VCO
troubleshooting chart
Are
Waveforms
at Pins 14 & 15
triangular
?
Do
Pins 7,8 & 9
of U4201 toggle
when channel is
changed?
Check programming
lines between
U0101 and U4201
Pins 7,8 & 9
Replace
U4201
Check uP U0101
Troubleshooting
Chart
NO
YES
NO
YES
NO
YES
NO
NO
NO
YES
YES
NO
YES
YES
NO
YES
YES
YES
NO
NO
NO
NO
YES
NO
YES
YES
Check D4201,
C4202, C4203, &
C4206
5V
at U4201
pins 5, 20, 34
& 36
Check 5V
Regulator
U4211
Is
16.8MHz
signal at
U4201 Pin
23?
Replace
U4201
YES
NO
NO
YES
NO
YES
Summary of Contents for 6864115B62-C
Page 1: ...Professional Radio GM Series Detailed Service Manual 6864115B62 C ...
Page 2: ...ii ...
Page 4: ...iv ...
Page 5: ...Professional Radio GM Series Service Maintainability Issue July 2007 ...
Page 8: ...ii ...
Page 22: ...2 10 MAINTENANCE ...
Page 25: ...Professional Radio GM Series Controlhead Service Information Issue July 2007 ...
Page 77: ...Professional Radio GM Series Controller Service Information Issue May 2007 ...
Page 100: ...2 2 TROUBLESHOOTING CHARTS ...
Page 104: ...3 4 Controller schematics parts list ...
Page 154: ...3 52 Controller T12 Schematic Diagrams ...
Page 155: ...Professional Radio GM Series VHF 136 174MHz Service Information Issue May 2007 ...
Page 164: ...1 6 MODEL CHART AND TECHNICAL SPECIFICATIONS ...
Page 176: ...2 12 THEORY OF OPERATION ...
Page 186: ...3 10 TROUBLESHOOTING CHARTS ...
Page 190: ...4 4 VHF PCB SCHEMATICS PARTS LISTS ...
Page 252: ...4 66 VHF 1 25W PCB 8471235L02 Schematics VHF 136 174 MHz IF ...
Page 256: ...4 70 VHF 1 25W PCB 8471235L02 Schematics ...
Page 257: ...Professional Radio GM Series UHF 403 470MHz Service Information Issue May 2007 ...
Page 266: ...1 6 MODEL CHART AND TECHNICAL SPECIFICATIONS ...
Page 366: ...2 12 THEORY OF OPERATION ...
Page 372: ...3 6 Low Band TROUBLESHOOTING CHARTS ...