All Or Some Of The Function Keys Do Not Respond - Matrix MX-A5 Series Service Manual

All or some of the function keys do not respond

Possible causes:
1. Keypad connecting plug has been not fit-in properly.
2. Keypad is damaged.
3. Upper board is damaged.
Fix:
1. Remove the console cover, and then check if keypad cable is
connected properly to the upper board.
If it has not been connected well, reconnect it to the terminal and
check again.
2. Keypad or upper board is damaged.
Replace the console.
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