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Flow Chart of Troubleshooting
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7-35
7-21. PCS Transmitter
Check U102
pin23, 26, 31
>=2.7V
No
Resolder U102
Check UCP200
END
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Check & Resolder RFLO
signal, RF26MHz,
RF PSU Part
Check +VBAT or PAM
control signal
Resolder or Change PAM100
Check PAM100
pin 3,4,5,6,7 OK?
Yes
U102 pin 6,7,8,9
>= 1V
Resolder C161,R130,
C162,L139,L135
Resolder C138
Change or Resolder F101
Check ANT Switch
control circuit
PAM100 pin1
<= -11dBm
U102
pin2
<= -15dBm
PAM100 pin14
>= 18dBm
F101 pin10
>= 18dBm
Check F101
pin12,13 =
L
pin9 = H (2.68V)
TX ON (5Level)
Resolder RFS100,C103,L141
F101 Pin8
>= 20dBm