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