9.2.8
Errors with code E850 and E852
These errors indicate a keyboard fault.
9.2.8.1
E850: One or more buttons pressed during power ON
During the power ON phase, one or more keyboard buttons have been sensed as
pressed by the MCU board (A1).
1.
With the unit switched OFF, check that no keyboard buttons are pressed: power
the unit ON and verify if the error is still present.
2.
With the unit switched OFF, disconnect cable X12 on MCU board, power ON the
unit, wait the connection with the GUI (about 3 minutes) and verify that error
E850 is no more displayed.
a.
If the error is still present, replace the MCU board (see paragraph 11.3.2)
b.
If the error is no more displayed, verify:
-
integrity of the cable X12-X46 between MCU and X46/X47: replace the
cable and verify if the error is still present
-
integrity of the cable X46/X47 between X12-X46 and Interface board
A5: replace the cable and verify if the error is still present (* see Note)
c.
If the above tests are OK, replace the keyboard membrane and then the
Interface board (A5) (* see Note).
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