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4-
12
SGH-X400 Flow Chart of Troubleshooting
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7. FM Radio part
Check the pin5 of the
U1103 is 3V DC
FM Radio receiver Function failure
Check the pin16 of
U1101 shows a
periodic waveform(≒
13MHz)
Check U1103 and the relating parts
Check the 0.5~2V DC
at the anodes of the
D1101, D1102
Check the 'Audio
signal' waveform at
the C1111
Check the amplified
'Audio signal'
waveform at the Pin1
of U1102
END
No
Yes
Yes
Yes
Yes
Yes
No
Check the headset
Check OSC1101 and the relating parts
No
Check the connections of the relating
parts
Check the pin18 of
U1101 is 1.0~1.5V
Yes
No
Check the connections of the relating
parts
No
Check the solderings of those capacitors
No
Check for any broken connection
