Diagnostic information 2-135
7526
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 “Accessing test and diagnostic procedure
menus” on page 3-1), and verify that the problem is fixed before performing a POR.
This error code indicates a mismatch between the system board and the scanner MDC card.
Step Questions / actions Yes No
1 Has the MDC card been replaced recently? Replace the scanner MDC
card with a new and
previously installed
scanner MDC card. See
“Scanner MDC card
removal” on page 4-261.
Go to step 2.
2
Has the flatbed scanner been replaced
recently?
Replace the flatbed
scanner with a new and not
previously installed flatbed
scanner. See “Flatbed
scanner removal” on
page 4-255
Go to step 3
3
Has the system board been replaced
recently?
Replace the system board
with a new and not
previously installed system
board. See “System
board removal” on
page 4-157
Go to step 4.
4
Turn the printer power off for ten or more
seconds. Then turn the power back on (POR
the printer).
Is the error gone, and can the printer print?
Problem resolved. Go to step 5.
5
Clear the NVRAM of the printer.
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?
Go to step 6. Problem resolved.
6
Replace the scanner MDC card. See
“Scanner MDC card removal” on
page 4-261.
Replace the system board.
See “System board
removal” on page 4-157.
Problem resolved.
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