Troubleshooting Flow Chart For Synthesizer - Motorola GP2000 Service Manual

Troubleshooting charts
Correct
Problem
NO
Is Q314 Emit-
terAT=13VD
YES
Check Q301,
L303,C303,R301,
C304 & R302
Is Q310 Pin 2
<0.7 VDC in RX &
>4.3 VDC in TX?
YES
NO
Is Q330 corrector
AT4.65 VDC?
YES
Replace
Q201
Replace or
resolder
necessary
components
NO
Fix
Connection
NO
Is Connection
NO
between Q310
Pin 2 & CN701
Pin 35 OK?
YES
Replace C701
NO
Is RF level at
Q324
between -10 &
+5 dBm?
YES
Are Q308,L301
NO
C308,C310,C309
YES
Start
Visual
check of the
Board OK?
YES
+5VQ323 at
NO
Pins
3, 4
YES
NO
Are signals
at PinÕs 2 of
Q323 ?
YES
NO
Is there a short
between Pin 32 and
Pins 9 & 10 of
U201?
YES
Remove
Shorts
See VCO
troubleshooting chart
Replace Q308
Check 5V
Regulator
Is 14.4MHz
NO
Signal at
X301,C337,C338,C336
Q323 Pin 1?
YES
NO
Are Waveforms
at Pins 2 of Q323
YES
Do Pins 9,10& 11
NO
of Q323toggle
when channel is
changed?
Check programming
lines between Q323
Pins 9,10 & 11
NO
Is information
from Q101
correct?
Check Q101
Troubleshooting
Chart
Replace Q323
Troubleshooting Flow Chart
for Synthesizer
Section 7 -29
Check
YES
YES