950.29-Eprom Mismatch Failure - Lexmark X746de Service Manual

950.00–950.29—EPROM mismatch failure
Warning: When replacing any one of the following components:
• Scanner MDC card or flatbed scanner
System board
•
Replace only one component at a time or the MFP will be rendered inoperable. Replace the required
component, and bring the MFP up in Diagnostic Menu (see
menus" on page
This error code indicates a mismatch between the system board and the scanner MDC card.
Step Questions / actions
Has the MDC card been replaced recently?
1
Has the flatbed scanner been replaced
2
recently?
Has the system board been replaced
3
recently?
Turn the printer power off for ten or more
4
seconds. Then turn the power back on (POR
the printer).
Is the error gone, and can the printer print?
Clear the NVRAM of the printer.
5
1. Turn the printer power off.
2. With the printer off, press and hold the 2,
6, 7, and 8 buttons.
3. Turn the printer power on.
4. When the message Restoring Factory
Defaults displays, release the buttons.
If the MFP locks up on the Restoring Factory
Defaults message, wait two minutes, and then
turn the printer power off. After ten seconds or
more, turn the printer power back on without
holding down any buttons.
Is the error message displayed?
Replace the scanner MDC card. See
6
"Scanner MDC card removal" on
page 4-261.
3-1), and verify that the problem is fixed before performing a POR.
"Accessing test and diagnostic procedure
Yes
Replace the scanner MDC
card with a new and
previously installed
scanner MDC card. See
"Scanner MDC card
removal" on page 4-261.
Replace the flatbed
scanner with a new and not
previously installed flatbed
scanner. See
"Flatbed
scanner removal" on
page 4-255
Replace the system board
with a new and not
previously installed system
board. See
"System
board removal" on
page 4-157
Problem resolved.
Go to step 6.
Replace the system board.
See
"System board
removal" on page 4-157.
7526
No
Go to step 2.
Go to step 3
Go to step 4.
Go to step 5.
Problem resolved.
Problem resolved.
Diagnostic information
2-135
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