Motorola MTM700

TROUBLESHOOTING CHARTS (400MHz) MTM700 Mobile Radio / Detailed Service Manual 9.1 - 15
Receiver Troubleshooting (Sheet 2)
No
No
No
No
No
No
No
A
RF
level at
Q5201 Collector
about -10dBm and
DC about
3.2V
?
Check transistor
stage Q5201
Check transistor
stage Q5101
Check components
between Q5101
and C5127
RF
level at
Q5101 Collector
about -2dBm and
DC about 4.4V
?
RF
level at
C5127 about
-30dBm and DC
about 1V
?
Set IFR TX Frequency
to 18MHz
18MHz
RF level
at C5197 about
-13dBm and DC
about 3.1V
?
Check components
of
VCO stage Q5190
Check components
of
VCO stage Q5180
Set IFR TX Frequency
to 71.1MHz
71.1MHz
RF level at
C5187 about -13dBm
and DC about
1.8V
?
Check DC at U5102
fo 9.3V before
replacing U5102
3.3V DC at
U5102 pin 5
?
Check DC at U5103
fo 9.3V before
replacing U5103
Replace U5101
3.3V DC at
U5103 pin 5
?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
ZWG0130969-O