Motorola CM160

3-6 TROUBLESHOOTING CHARTS
2.2 Troubleshooting Flow Chart for 40W Transmitter (Sheet 3 of 3)
No
Yes
Yes
No
Check Final PA Stage
PA_Bias
Voltage at
R134
2.11V
RF Voltage
after C1044
>0.11mV?
Voltage
across R122
>2V?
RF Voltage
Q105 gate
>1V?
RF Voltage
Q100 gate
>7V?
Check components
between Q100 &
antenna connector
Replace Q100
Check FGU
Check components
between C1044 &
C1117
Check components
between C117 &
Q105
Check components
between Q105 &
Q100
No
No
Yes
Yes
1-4V
Supply Voltage
Check components
between ASFIC &
Q100 before re-
placing Q100
RF Voltage
after C1044
>0.36mV?
Check Bias Tuning
before replacing
ASFIC U504
Yes
No
0V