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SGH-X140 Flow Chart of Troubleshooting
2-
10
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U402 CHECK
pin8
≥
-65dBm ?
2-2.RF
2-2-1. EGSM RX
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
CHECK
ANT2,R401 contact ?
U404
pin 9,32: 2.8V ?
U402 CHECK
pin2,3
≥
-65dBm ?
U404 CHECK
pin20,21
≥
-65dBm ?
C402,U401
resolder or change
U402
resolder or change
C408,C409,L401
resolder or change
U101 pinA13, C111
change or resolder
U404 CHECK
pin 8 : 13MHz ?
Vp-p : 950mV?
OSC401
change or resolder
U404
resolder or change
U101 CHECK!!
U404
pin1,2,3,28 Vp-p
: 120mV ?
NO
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES