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10-12-2. GSM850 Transmitter
TX ON (5Level)
Yes
F101 Pin19
>= 20dBm
Yes
F101 Pin15
>= 20 dBm
Yes
PAM101 Pin12
>= 20 dBm
Yes
PAM101 Pin7
> = 3dBm
Yes
UPL101 pin 4,5,6,7
>= 1V
Yes
Check UME301
END
No
Resolder RFS101,C106
No
No
Resolder C116,C119,C120
or Change PAM800
No
No
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Check F101
pin10 = H
,pin11 = L
Yes
No
Check PAM101
+VBAT(pin4) OK?
Yes
No
Check all voltage
sources of UPL101
>=2.8V
Yes
10-38
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Resolder F101
Resolder or Change PAM101
Check +VBAT or PAM
control signal
Check & Resolder
RF PSU Part
Resolder UPL101
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