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4-3 Electrical Malfunction
The display board is
defective.
Replace the display
board.
Yes
Yes
Yes
No
Push "ON/OFF" button to restart
unit, does the symptom continue?
Perform the operation again and check if
it is working properly.
Some buttons can't work
Is
the
button
recognized at all?
No
Is the button recognized
intermittently?
No
Is
the
button
not
recognized after cleaning
the control panel?
No
Yes
Replace the display
board.
- 22 -
not
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