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Possible fault sources:
a.Flat cable between keypad display board and mainboard is loosened or damaged
b.Keypad display board malfunctions
c.Mainboard works abnormally
d.Programs are garbled
Recommended solutions:
a.Plug again or replace the flat cable
b.Maintain or replace the keypad display board
c.Maintain or replace the mainboard
d.Replace the program chip, and write in the program over again