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keys do not work
keys do not work
Go
Check voltage +3.3V on keypad board
XS1 of pin 2,3,4,
Yes
Check keypad Board signals of XS1 pin2,3,4,5
if have high or low voltage
Yes
Replace switch on keypad Board
whether normal or not.
5-2
No
Fix the connection XS1 to XP1 on Main
Board
No
Replace U36 on Main Board, or
replace Main Board
Trouble shooting Chart
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