Samsung SCH-A101 Service Manual page 25

6-1-4 Abnormal Key Data input
Check initial status
Scanning signals
output from U104 pins
4A,4B,5A,5C,6C,5E.?
Check U101 pin 2A,4C, and 3B
Check CON J1.
Normal key data input?
Yes
Yes
Yes
Yes
END
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Check U101 pins
No
4A,4B,5A,5C,5D,6C,5E
No
Replace the key pad assembly
6-4
Troubleshooting