Gsm Transmitter - Samsung SGH-J400 Service Manual

Flow Chart of Troubleshooting

9-10. GSM Transmitter

TX ON (5Level)
Yes
U103 pin19
≥ 30dBm
No
RFS100 pin25
≥ 30dBm
No
PAM100 pin11
≥ 30dBm
No
PAM100 pin7
≥ -4dBm
No
Check U200
END
Yes
Resolder RFS100,C112,L102
Yes
Yes
Resolder or Change R108
Yes
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VDD = H (2.5V),
VC1 , VC2 = 1.5V
VC3= 0
Yes
Yes
Check PAM100
pin2,3,4,5,8 is ok?
No
9-16
No
Check ANT Switch
control circuit
Change or Resolder U103
Resolder or Change PAM100
Check VBAT or PAM
control signal