Troubleshooting Flow Chart For Receiver Rf (Sheet 1 Of 2) - Motorola Radius CM200 Service Manual

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Troubleshooting Flow Chart for Receiver RF (Sheet 1 of 2)

Go to
DC Section
Check Q306, Q300
and U403
Check Q304, D305
and U403
Go to SYN
Section
Go to
DC Section
Problem
No
in 12.5 KHz and
25 KHz channel
spacing
Yes
9V on
Yes
No
R310 (LNA)
OK
?
Yes
No
RX_EN
ON ?
No
Yes
LOC_DIST
ON
?
No
LO
Yes
POWER
OK ?
No 5V
Yes
(IF AMP)
OK ?
START
(Either 12.5K or 25K channel spacing having problem)
Check
RX_EN
DC Section
Check
LOC_DIST
Check
TP1
Check 5V
on R337 (UHF),
R336 (VHF)
Check 3V
on R338
Go
to A
TROUBLESHOOTING CHARTS
3 V
Go to
No
to U301
Okay ?
Yes
Check D301-304
Replace IF Filters( FL304, FL301
If problem in 25 KHz spacing