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Mobilchips
SGH-X610 Flow Chart of Troubleshooting
2-
23
U403 CHECK
pin5, 11, 13 < 0.2v ?
2-2.RF
2-2-1. GSM900 RX
NORMAL CONDITION
catch the channel?
CHECK
CON401, L402 contact ?
OSC301
pin 4: 2.8V ?
CHECK the C411,
C409, L403
CHECK the
pin20, 21 of U402
C432, C433
resolder or change
C411, C409, L403
resolder or change
U402
resolder or change
U101, pin A13, R301, C307
change or resolder
OSC301
CHECK
pin 3 : 13MHz ?
Vp-p : 950mV?
OSC301
change or resolder
OSC301
resolder or change
Is RX ox?
NO
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
END