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Flow Chart of Troubleshooting
9-20
9-12. WCDMA TX
TX ON
Target Power = 23dBm
F101 pin11
>=10 dBm
Resolder RFS101,
C105,L101,R105,L132
F101 pin9
>=8 dBm
Yes
No
Yes
Check F101
truth table
Check R107,R110,
R116,UCP201(MSM)
No
Resolder or Change
F101
Resolder or Change F104,
C165,C197,L129
Yes
Yes
No
Check U101 & UCP201
Resolder or change
F103,L120
END
F104 pin7
>=5 dBm
No
Check
Operating
mode
No
Check
UCP201
Check VBAT or
Resolder or Change
PAM101
Yes
Yes
Yes
PAM101 pin8
>=-15 dBm
No
PAM101 pin2
>=-30 dBm
No
F103 pin1
>-30dBm
No
1.
Check FEM(F101) output
2.
Check FEM(F101) input
3.
Check Duplexer(F104)
4.
Check PAM(PAM101) output
5.
Check PAM(PAM101) input
6.
Check Tx Filter(F103) input
7.
Check RTR6275(U101), MSM6260(UCP201)
Check UCP201
Yes
②
①
③
④
⑤
⑥
⑦
⑧
Pin#6: High
Pin#5: Low
Pin#4: High
Pin#3(VMode2)=L
Pin#4(VMode1)=L
Pin#3(VENA)=H