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Flow Chart of Troubleshooting
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7-35
7-18. PCS Receiver
LMSP54HA-350 pin8
>= -65dBm
Resolder RFS101, C106
No
Yes
RX ON
RF input : 661CH
Amp : -50dBm
Check LMSP54HA-350
pin9= H
pin10, pin12 = L
LMSP54HA-350
pin3, pin>= -65dBm
U102
B1 >= -70dBm
A1 >= -70dBm
Check ANT Switch
control circuit
Resolder LMSP54HA-350
Resolder C107, C142, L109
Yes
Yes
Yes
No
No
No
END
U102 pin7,8,9,10
>= 1V
Check U102
pin28,pin31 >=2.7V
Check & Resolder
U102, R108 R107
RF26MHz, RF PSU Part
Resolder U102
C140, C141
>= 1V
Yes
Yes
Yes
Yes
No
No
Check UCP200