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8-3- 13 . GSM900 Transmitter
TX ON (5Level)
Yes
PAM100 Pin 19 ≥
30dBm
Yes
PAM100 pin 4 ≥ -4
dBm
Yes
UCP100 pinF1
≥ -4dBm
Yes
Check & Resolder
C102,C100,C104,
L100, ZD100
C101, C103
And PMU Part and UCP100
Yes
END
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No
Resolder L1 20
Check PAM100
No
pin 29 = H
Pin 31 = H
No
Check PAM100
VBATT(pin 7 , 26 ) OK?
No
Resolder or Change
C1 77
8-27
No
Yes
Change or Resolder PAM100
Yes
No
Check VBAT or PAM
Level 3 Repair
Check ANT Switch
control circuit
Check UCP100
control signal
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