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Flow Chart of Troubleshooting
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10-42
10-12-4. EGSM900 Transmitter
TX ON (5Level)
Check & Resolder
RF PSU Part
Yes
No
Resolder UPL101
Check all voltage
sources of UPL101
>=2.8V
Resolder or Change PAM101
No
F101 Pin19
>= 20dBm
Resolder RFS101,C106
Check F101
pin10 = H
,pin11 = L
F101 pin15
>= 20 dBm
PAM101 pin12
>= 20 dBm
1.5dBm >=
PAM101 pin7
> = 5.5dBm
Change or Resolder
F101
Check ANT Switch
control circuit
Resolder C116,C119,C120
or Change PAM101
UPL101 pin 4,5,6,7
>= 1V
Yes
Check PAM101
+VBAT(pin4) OK?
Check +VBAT or PAM
control signal
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
END
Check UME301
Yes
Summary of Contents for SGH-I740c
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