Motorola GP2000 Service Manual

Troubleshooting charts Section 7 -31
4.3 VDC at
Q308 Pin 5?
4.65 VDC at
Q414 collector?
=151 mVrms
at Ò+Ó Side
of C311?
4.65 VDC
at Q329?
1.3 VDC at
Q308 emitter?
Are Q325PinÕs
emitter at
1.3VDC,
collector at
4.5VDC,
base at 0.7
VDC
Q324
emitter at 1.3VDC,
collector at
4.5VDC,
base at 0.7VDC
?
1.3 VDC at
Q308 emitter
?
0.7 VDC at
Q308 base ?
4.65 VDC at
Q415 collec-
tor?
Troubleshooting Flow Chart
for VCO
Low or no Power
at Pin 4 of Mixer
VisualCheck
of Board OK?
If all parts from Q324
of mixer are OK, then
replace Q324
If all parts associated
with those PinÕs are OK,
then replace Q308
If all parts from Q325
Pin 4 to Input of PA are
OK, then replace Q325
If C359 and L316
are OK, then
replace Q329
Replace R347
Replace
C311
Low or no power
at Input to PA
Visual check
of Board OK?
Correct
Problem
Make sure Synthesizer is
working correctly.
Check runner
between U201 Pin 1
and U251 Pin 5
Replace
L427 or R430
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
YES
NO
YES
NO
NO
YES
NO
NO
YES
NO
YES
RX VCO
TX VCO
Power OK but no
Modulation

Motorola GP2000 Specifications

General

Brand	Motorola
Model	GP2000
Category	Portable Radio
Language	English