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Flow Chart of Troubleshooting
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9-23
9-13. GSM850,900 Transmitter
Resolder RFS100, L100, L101, L102,
C103, C181
U103 pin
4,6,7,12,26,32,34
≥
2.8V
END
Check U200
Yes
Resolder U103
Change or Resolder PAM100
Yes
U103 PIN10
≤
30dBm
TX ON (5Level)
Check PAM100
PIN8 = H (2.6V),
PIN9 = L
PAM100 pin4
≥
2dBm
Check ANT Switch
control circuit
U103 pin 27,28,29,30
≥
0.2Vp_p
Yes
Check & Resolder
C127,C128,C138
No
No
Yes
Yes
Yes
No
No
No