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Flow Chart of Troubleshooting
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10-48
10-12-7. PCS 1900 Receiver
Check all voltage
sources of UPL101
>=2.8V
Resolder UPL101
Yes
No
Check ANT Switch
control circuit
Check & Resolder
RF PSU Part
No
END
Check UME301
Yes
No
UPL101 pin 4,5,6,7
>= 1V
Yes
F101
pin 7 >= -70dBm
pin 8 >= -70dBm
Resolder C125 C126, L105
No
Resolder F101
Yes
Yes
No
Check F101
pin10 = L
,pin11 = L
F101 7, 8
>= -68dBm
Yes
Resolder RFS101,C106
No
F101 Pin19
>= -65dBm
Yes
RX ON
RF input : CH center freq : +67.7kHz
Amp : -50dBm
Summary of Contents for SGH-I740c
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