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9-12. GSM850 Transmitter
TX ON (5Level)
Yes
F100 Pin2
>= 20dBm
Yes
F100 pin11
>= 20 dBm
Yes
PAM100 pin9
>= 20 dBm
Yes
1.5dBm >=
PAM100 pin8
> = 5.5dBm
Yes
U101 pin 1,3,23
>= 1V
Yes
Check UCP300
END
No
Resolder RFS100,C110
No
No
Resolder L106,C119,L126
No
No
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Check F100
pin3 = H, pin4 = L
,pin5 = L, pin6 = L
Yes
or Change PAM100
Check PAM100
and VBAT(pin4) OK?
No
Check all voltage
sources of U101
Is it OK?
Yes
9-35
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Change or Resolder
F100
Yes
Resolder or Change PAM100
Check VBAT or PAM
control signal
No
Check & Resolder
CP PMIC(U401)t
Resolder U101
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