Gsm Transmitter - Samsung SGH-E740S Service Manual

9-14. GSM Transmitter

TX ON (5Level)
Yes
MOD100 pin8
>= 20dBm
Yes
MOD100 pin13
>= 18dBm
Yes
PAM100 pin12
>= 18dBm
Yes
PAM100 pin7
>= -11dBm
Yes
U101 pin1, 2, 3, 4
>= 1V
Yes
Check UCP200
END
No
Resolder CN100, C102
No
No
Resolder C107, L111
No
No
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Check MOD100
pin12 = H and
pin10 = L
Yes
Check PAM100
pin4, pin6 = H
Yes
Check U101 pin
5, 15, 17, 20, 31, 38
>=2.7V
Yes
9-29
Flow Chart of Troubleshooting
No Change or Resolder
MOD100
Check ANT Switch
control circuit
No
Check VBAT or PAM100
control signal
Resolder or Change PAM100
No
Resolder U101
Check & Resolder
U101, TCX100
(26MHz), RF PSU Part