Troubleshooting Flow Chart For 45 W Transmitter (Sheet 3 Of 3) - Motorola Radius CM200 Service Manual

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Troubleshooting Flow Chart for 45 W Transmitter (Sheet 3 of 3
2.2
Check components
between ASFIC &
Q100 before re-
placing Q100
Yes
Check Final PA Stage
0V
RF Voltage
after C1044
>100mV?
No
Check Bias Tuning
before replacing
ASFIC U504
Check components
antenna connector
Supply Voltage
PA_Bias
Voltage at
R134
1–4Vdc
No
RF Voltage
after C1044
>100mV?
Yes
No
Voltage
across R122
>2V?
Yes
No
RF Voltage
Q105 gate
>1V?
Yes
No
RF Voltage
Q100 gate
>1.5V?
Yes
between Q100 &
TROUBLESHOOTING CHARTS
Replace Q100
Check FGU
Check components
between C1044 &
C1117
Check components
between C1117 &
Q105
Check components
between Q105 &
Q100
)