Motorola Radius CM300 User Manual

3-4 TROUBLESHOOTING CHARTS
2.0 Troubleshooting Flow Chart for 45 W Transmitter (Sheet 1 of 3)
START
Yes
No
Check components between
Q100 and RF output,
Antenna Switch D104,
D103, VR102 and Q106
No or too low power when keyed
Current
increase when
keyed?
Check power settings, tuning
& components between U103
Pin 3 and ASFIC Pin 6 before
replacing ASFIC
Control
Voltage at
TP150
>4Vdc?
Check PA
Stages
>4A
Voltage U103
pin 5 =
4.7V?
U103 Pin 3
<1.6Vdc
U100 Pin 3
>1.8Vdc
Check 9.3V
Regulator
U501
Yes
Yes
No
No
Yes
Check
U103
Check forward
Power Sense
Circuit
No
Short U100
Pin 3 to
ground
Voltage at
TP150 rises?
Check PA
Stages
Check Forward
Power Sense
Circuit
Yes
No
>1A & <4A
<1A

Motorola Radius CM300 Specifications

General

Brand	Motorola
Model	Radius CM300
Category	Radio
Language	English