All Or Some Function Keys Do Not Respond (For Xr); Speaker And Audio Issue (For Xer/Xir) - Matrix XR Service Manual

8.4 All or Some of the Function Keys Do Not Respond (For XR only)
1) SYMPTOM:
All or Some of the Function Keys Do Not Respond.
2) SOLUTION:
a. The keypad connection ribbon cable has not been plugged in correctly.
Check the connections of the keypad at the UCB.
Remove the console from the console bracket.
Remove the 6 screws holding the back of the console to the front.
Inspect the keypad ribbon cable connection at the UCB .
Even if the keypad ribbon cable appears to be connected correctly, unplug and reseat the cable, then
retest.
b.The keypad is damaged, please refer to section 9.2-overlay replacement.
Replace the keypad.
c. The UCB is damaged.
Replace the UCB.
8.5 Speaker /Audio Issues (For XER/XIR)
1) SYMPTOM:
The speaker or headphones have no sound output.
2)
SOLUTION:
a. Confirm whether the speaker wire is well-connected with the UCB.
b. If well-connected, make sure that the audio output short-circuit terminal is present and tight.
c. Update the console software
d. If the speakers have sound output, but headphones have no sound output, replace the headphone wire.
If problems persist, replace the headphone board
CHAPTER 8: TROUBLESHOOTING
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