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Flow Chart of Troubleshooting
9-28
9-15. EGSM900 Transmitter
TX ON (5Level)
Check & Resolder
RF PSU Part
Yes
No
Resolder F800
Check all voltage
sources of F800
>=2.8V
Resolder or Change PAM801
No
UPL802 Pin8
>= 20dBm
Resolder RFS00,C806
Check UPL802
pin13 = H
,pin14 = L
UPL802 pin15
>= 20 dBm
PAM801 pin9
>= 20 dBm
PAM801 pin11
> = 3dBm
Change or Resolder
UPL802
Check ANT Switch
control circuit
Resolder C856,C857,L802
or Change PAM801
F800 pin 4,5,6,7
>= 1V
Yes
Check PAM801
+VBAT(pin4) OK?
Check +VBAT or PAM
control signal
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
END
Check UME702
Yes