Service manual

99R85452E01-O August 30, 2002
VHF Band Information
: Troubleshooting Charts 7-13
Figure 7-9.
Is
information
from µP Q101
correct?
Is Q330 corrector
AT4.65 VDC?
Is Q314 Emitter
AT=13VDC
Is Q310 Pin 2
<0.7 VDC in RX &
>4.3 VDC in TX?
Troubleshooting Flow Chart
for Synthesizer
Start
Visual
check of the
Board OK?
Correct
Problem
Check 5V
Regulator
+5VQ323
at Pins
3, 4
Is 14.4MHz
Signal at
Q323 Pin 1?
Check
X301,C337,C338,C336
Are signals
at Pins 8 of
Q323 ?
Check Q301,
L303,C303,R301,
C304 & R302
Fix
Connection
Is
Connection
between Q310
Pin 2 & CN701
Pin 35 OK?
Replace CN701
Replace
Q201
Replace or
resolder
necessary
components
Is RF level
at Q324
between -10 &
+5 dBm?
Are Q308, L301
C308, C310, C309
Replace Q308
See VCO
Troubleshooting Chart
Are Waveforms
at Pins 8 of Q323
Do Pins
9,10 & 11
of Q323 toggle
when channel is
changed?
Check programming
lines between Q323
Pins 9,10 & 11
Replace Q323
Check µP Q101
Troubleshooting
Chart
NO
YES
NO
NO
NO
NO
YES
YES
NO
YES
YES
NO
YES
NO
YES
YES
YES
NO
NO
NO
YES
NO
YES
YES
NO
Check
R358, C312
C313
YES