Matrix S5X-04, Service Manual, Page: 33 / 73

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All oR SoME of THE fUNCTIoN KEyS Do NoT RESPoND
PoSSIblE CAUSES:
1) The keypad connection ribbon cable has not been plugged in correctly.
2) The keypad is damaged.
3) The UCB is damaged.
SolUTIoN:
1) Perform a keypad test in Service Mode:
a. Press and hold both the UP and DOWN LEVEL keys until Manager Mode appears on the display.
b. Use the UP and DOWN LEVEL keys to scroll to Service Mode 2 and press ENTER.
c. Test the affected keypad. If the keypad works in the keypad test it may not be a functioning key in the program used for testing it.
2) Check the connections of the keypad at the UCB.
a. Remove the console from the console mast.
b. Remove the 6 screws holding the back of the console to the front (Figure A).
c. Inspect the keypad ribbon cable connection at the UCB (Figure B).
d. Even if the keypad ribbon cable appears to be connected correctly, unplug and re-seat the cable.
3) Replace the affected keypad.
4) Replace the console.
fIgURE A fIgURE b
8.14 TRoUblESHooTINg - KEyPAD ISSUES
CHAPTER 8: TRoUblESHooTINg