Motorola Mototrbo - 2.0 Troubleshooting Flow Chart for 45 W Transmitter

1-4 Troubleshooting Flow Chart for 45W Transmitter
2.0 Troubleshooting Flow Chart for 45W Transmitter
No or Low
Transmitter Power
TP0710 >4Vdc?
TP0705
~9.3Vdc?
Voltage
across R0877
~3.7Vdc?
TP0706 &
TP0707
~2.6Vdc?
RF Power
@ TP0704
~+10dBm?
Is C3016
~9.1Vdc?
Check 9.3V Regulator in
Power Management
Is C3019 ~5Vdc?Replace U3002
Is voltage @
U0904 pin1
>3Vdc?
Check RFIC
Is voltage
@ U0902 pin3
>3Vdc?
Is voltage
@ TP0900
>1Vdc?
Replace U0904
Replace U0902
Replace U0901
No
Yes
Yes
Yes
No
No
No
Yes
No
Yes
Yes
RF Power
@ TP0700
~+10dBm?
TP0710 <1Vdc?
Check setup,
connections, C0856, &
J0700
No
Yes
No
RF Power
@ TP0703
-4dBm?
Check Final Bias
tuning codeplug and
Rodinia
Check D0875, D0701 with
DMM diode test function,
replace if not ~0.7V
Voltage
@ TP0709
>1Vdc?
No
Radio current
during Tx >2A?
No
Yes
Yes
Yes
Check
Ant_Enb line
from MCU
Section
No
Check Power
Control Loop
(D0951, D0900,
U0901)
Yes
Yes
TP0708
~3.8Vdc?
No
No
Replace Q0702
Yes
RF Power
@ TP0702
~26dBm?
RF Power
@ TP0705
~38dBm?
RF Power
@ TP0706
~38dBm?
RF Power
@ C0756
~48dBm?
Yes
Yes Yes
Yes
Yes
Yes
Check VCO and
D0700
Replace Q0703
No
Check parts between
Q0703 and Q0700
Replace Q0700
No
No
Replace Q0704
No
Check parts between
Q0704 and Q0702
No
Replace Q0702
No
Check parts between
Q0702 & J0700
Yes
No