Receiver (Sheet 1) - Motorola MTM700 Detailed Service Manual

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