Johnson JET7000 - All or Some of the Keys on Console Do Not Work

All or some of the keys on console do not work
Possible causes:
1. Keypad connecting
plug is not fit-in
properly.
2. Keypad is damaged.
3. PCB is damaged.
Fix:
1. Disconnect the keypad and replace the keypad,
and check again.
2. Replace the keypad.
3. Replace the PCB.
6-4 Revision: 1.0 Date: 2001-06-01