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