Samsung SCH-N500 Service Manual page 36

Flow Chart of Troubleshooting
7-1-4 Abnormal Key tone,voice / melody
Abnormal Key tone,voice / melody, ring tone Abnormal Key tone,voice / melody, ring tone
Is Key press Is Key press
sensed? sensed?
Yes Yes
Waveform Waveform
No No
exist exist
@C151,C152 @C113,C114
? ?
Yes Yes
Waveform Waveform
No No
exist exist
@U105 @U105
pin2,6 ? pin2,6 ?
Yes Yes
Yes Yes
Key tone,Voice Key tone,Voice
problem? problem?
Replace Key Replace Key
No No
Dome sheet Dome sheet
or Check dust or Check dust
Check U100 Check U100
Check U105 and its Check U105 and its
neighboring circuits neighboring circuits
Normal Normal
sound ? sound ?
Yes Yes
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No No
Waveform Waveform
No No
exist exist
@C139,C142 @C153,C155
? ?
Yes Yes
Waveform Waveform
No No
exist exist
@U104 @U103
pinA2,C2 ? pin6,10 ?
Yes Yes
No No
7-8
Check U100 Check U100
Check U103 and its Check U450 and its
neighboring circuits neighboring circuits
Check speaker Check speaker
connection. connection.
Replace if required Replace if required