Gsm Transmitter - Samsung SGH-G400 Service Manual

9-11 GSM Transmitter

TX ON (5 LEVEL)
C101 ≥ 50mV
C102 ≥ 50mV
Yes
C115 ≥ 0dBm
Yes
F104 PIN4 ≥ 0dBm
Yes
R114 > 2.5V
Yes
C157 > 2.5V
C165 < 0.5V
C166 > 1.5V
C174 < 0.5V
Yes
L105
≥ 30dBm
Yes
Resolder RFS100 or Change RFS100
END
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No
Check UCP301
No
Check U101
No
Resolder or Change F104
No
Check UCP301
No
Check UCP301
No
Resolder or Change MOD101
9-23
Flow Chart of Troubleshooting