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2-2-2. DCS RX
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NORMAL CONDITION
catch the channel?
YES
U402 CHECK
pin8 ≥ -65dBm ?
YES
U402 CHECK
pin4,5 ≥ -65dBm ?
YES
U404 CHECK
pin18, 19 ≥ -65dBm ?
YES
U404
pin 9, 32: 2.8V ?
YES
U404 CHECK
pin 8 : 13MHz ?
Vp-p : 950mV?
YES
U404
pin1,2,3,28 Vp-p
YES
U101 CHECK!!
SGH-X140 Flow Chart of Troubleshooting
NO
ANT2,R401contact ?
NO
resolder or change
NO
resolder or change
NO
C411,C413,L403
resolder or change
NO
U101 pinA13, C111
change or resolder
NO
OSC401
change or resolder
NO
U404
resolder or change
2-11
CONTINUOUS RX ON
RF INPUT : 698CH
AMP : -50dBm
CHECK
C402,U401
U402
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