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Flow Chart of Troubleshooting
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9-20
9-13. GSM850 Transmitter
Resolder L101, L105, C105, C106
U206 pin W12,W13,
W14,W15
≥
2.8V
END
Check U206
Yes
Resolder U206
Check VBAT or PAM
control signal
No
Change or Resolder PAM100
Yes
PAM100 Pin17
≥
30dBm
TX ON (5Level)
Check PAM100
pin12 = H (2.6V),
Pin13 = L
PAM100 pin27
≥
30dBm
U206 pinA2
≥
30dBm
PAM100 pin27
≤
-2dBm
Check ANT Switch
control circuit
Resolder or Change R108, L106,
C112
U206 pin
E1,D1,G1,F1
≥
0.2Vp_p
Yes
Check PAM100
pin2,3,4,5,6,30 OK?
Resolder or Change PAM100
Check U206,
C206,C207,C210,C211
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No