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Flow Chart of Troubleshooting
9-39
9-14. GSM900 Transmitter
TX ON (5Level)
Check & Resolder
CP PMIC(U401)t
Yes
No
Resolder U101
Check all voltage
sources of U101
Is it OK?
Resolder or Change PAM100
Yes
F100 Pin2
>= 20dBm
Resolder RFS100,C110
Check F100
pin3 = H, pin4 = L
,pin5 = L, pin6 = L
F100 pin11
>= 20 dBm
PAM100 pin9
>= 20 dBm
1.5dBm >=
PAM100 pin8
> = 5.5dBm
Change or Resolder
F100
Check ANT Switch
control circuit
Resolder L106,C119,L126
or Change PAM100
U101 pin 1,3,23
>= 1V
Yes
Check PAM100
and VBAT(pin4) OK?
Check VBAT or PAM
control signal
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
No
No
END
Check UCP300
Yes
Summary of Contents for GT-B7300B
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