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7-14. GSM Transmitter
TX ON (5Level)
U100 H7,H8,J7,J8
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www.Manualslib.com
Yes
Module1 Pin8
>= 20dBm
No
Module1 pin11
>= 18dBm
No
U101 pin8
>= 18dBm
No
U101 7pin
>= -11dBm
No
>= 1V
Yes
Check U200
END
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Yes
Resolder CN100, C103
Check Module1
Yes
pin10 = H (2.68V),
pin9, pin12 = L
Yes
Yes
Resolder R122, L106
Check U101
Yes
+VBAT, pin4, pin6
OK?
No
No
Check U100
J2,A6,B6,A9,E9
>=2.7V
Yes
7-29
Flow Chart of Troubleshooting
No
Check ANT Switch
control circuit
Change or Resolder
Module1
Yes
Resolder or Change U101
Check +VBAT or U101
control signal
No
Check & Resolder
U100, R117
RF26MHz, RF PSU Part
Resolder U100
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