Dcs Transmitter - Samsung i640 Service Manual

Flow Chart of Troubleshooting

9-11. DCS Transmitter

TX ON (PCL 0 level)
U100 pin11
>=0 dBm
U100 pin15
>=0 dBm
PAM100 pin16
>=0 dBm
PAM100 pin2
>=-25 dBm
Check U200
END
Resolder RFS100,
Yes
C104,L100,R100,
No
Yes
No
Resolder or Change
Yes
C132,C195 (PAM out)
Yes
Pin#5(BS)=H
Pin#6(EN)=H
No
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C105
No
Check
U100 truth
table
Yes
U100,
Check Vramp
OK
Check
Operating
Yes
mode
9-38
Pin#6: High
Pin#5: High
Pin#4: Low
Check
R106,R109,
R118,UCP200
Resolder or
Change U100
Resolder PAM100,
Check UCP200
Check VBAT or
Resolder / Change
PAM100
Resolder or change
R119,UCP200