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