Motorola CDM Series Detailed Service Manual page 577

Troubleshooting Flow Chart for 45 W Transmitter
Troubleshooting Flow Chart for 45 W Transmitter (Sheet 3 of 3)
2.2
Check components
between ASFIC and
Q3441 before
replacing Q3441
ASFIC
YES
U0221 pin 6
1-4V DC?
NO
Check bias tuning
before replacing ASFIC
U0221
Check final PA stage
Supply
Voltage
Bias 2 DC
0V
voltage at
TP3406?
1-4V
NO
RF voltage
at TP3401
>100mV?
YES
NO
RF voltage
U3401 Pin 6
>3V?
YES
NO
RF voltage
Q3421 Gate
>1V?
YES
RF voltage NO
Q3441 Gate
>4V?
YES
Check components
between Q3441 &
antenna connector
Section 11: 3-5
Replace Q3441
Check FGU (U3301)
Check components
between TP3401 &
C3417
Check components
between C3417 &
Q3421
Check components
between Q3421 &
Q3441
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