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