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Flow Chart of Troubleshooting
9-34
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9-11. GSM Transmitter
YES
NO
NO
YES
YES
NO
YES
NO
OK
YES
NO
NO
YES
NO
TX ON
(PCL 5 level)
F100 pin 11 >=
5 dBm
F100 pin 17 >=
5 dBm
PAM100 pin 9
>= 5 dBm
PAM100 pin7 >=
- 30dBm
Check U100
Resolder or Change F100,
L113, L133, C139, C126
Resolder RFS100,
L100, L101, C103, C109
Check F100 truth
table
Pin 4,5 :
LOW
Pin 6 : HIGH
Check Operating
mode
PAM100 pin3(BS) = L
Pin1(EN) = H
Check
Vramp
Check R103, R105,
R109, UCP200
Resolder or Change
F100
Resolder
PAM100,
Check UCP200
Check VBAT or
Sesolder / Change
PAM100
Resolder or Change
R113, UCP200
Содержание SGH-I780
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