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Flow Chart of Troubleshooting
9-22
9-15. GSM850 Transmitter
U102pin 11,12,16,
29,32,33,36 ≥2.8V
pin10≥1.8V
END
Check UCP200
Yes
Resolder U102
Check VBAT or PAM
control signal
No
Change or Resolder F100
Yes
F100 Pin11
≥ 30dBm
Resolder CN100,C102,L109
TX ON (5Level)
Check F100
pin14 = H (2.6V),
Pin10 = L
F100 pin17
≥ 30dBm
U100 pin12
≥ 30dBm
U100 pin7
≥ -4dBm
Check ANT Switch
control circuit
Resolder or Change C120,
C121, L114
U102 pin 4,5,6,7
≥ 0.2Vp_p
Yes
Check U100 pin
2,3,5,6,8, +Vbatt
pin4OK?
Resolder or Change U100
Check U102,
C122,C126,C128
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No