Motorola GM328

3-4 Troubleshooting Flow Chart for 40W Transmitter
2.1 Troubleshooting Flow Chart for 40W Transmitter (Sheet 2 of 2)
Check PA Stages
YES
Check
MOSBIAS_2/
MOSBIAS_3
YES
Are D4471 &
D4472 OK?
Check
ASFIC
NO
YES
Check Q4421
gate (12kohm)
and drain resis-
tances (15kohm)
NO
Change
Q4421
Is drive from
VCO
>+4dBm?
Do visual check on
all components
YES
Is voltage drop
across R4497
>4.5V?
NO
1
Check
PCIC_MOS
BIAS_1
Check
PCIC
Change
D4471 &
D4472
Check Q4441
gate (63kohm)
and drain resis-
tances (15kohm)
NO
YES
Change
Q4441
NO
Change
U4401
YES
YES
NO
NO
Troubleshoot
VCO