Motorola Radius CM300 User Manual

3-2 TROUBLESHOOTING CHARTS
1.0 Troubleshooting Flow Chart for Receiver RF (Sheet 1 of 2)
9V on
R310 (LNA)
OK
?
Check
RX_EN
No
Go to
DC Section
Yes
RX_EN
ON ?
No
Check Q306, Q300
and U403
Yes
START
LOC_DIST
ON
?
Check Q304, D305
and U403
LO
POWER
OK ?
Go to SYN
Section
Yes
Yes
No
No
Go
to A
Yes
3 V
to U301
Okay ?
No
Check
LOC_DIST
Go to
DC Section
Yes
Check D301-304
Replace IF Filters( FL304, FL301
If problem in 25 KHz spacing
Check
TP1
Check 5V
on R337 (UHF),
R336 (VHF)
5V
(IF AMP)
OK ?
Go to
DC Section
Yes
No
Check 3V
on R338
No
Problem
in 12.5 KHz and
25 KHz channel
spacing
(Either 12.5K or 25K channel spacing having problem)

Motorola Radius CM300 Specifications

General

Brand	Motorola
Model	Radius CM300
Category	Radio
Language	English