Lexmark T650 Service Manual page 146

4062
Error
code or
message
950.xx NVRAM mismatch
failure
952.xx NVRAM failure
953.xx NVRAM failure
954.xx NVRAM failure
955.xx NVRAM failure
2-110
Service Manual
Error contents
Mismatch between system
card EEPROM and operator
panel mirror.
".xx" codes:
00-29: mismatch between
system and mirror
30-60: mismatch between
secure and system
A recoverable MVRAM Cyclic
Redundancy Check (CRC)
error occurred.
The NVRAM chip has failed on
the operator panel door
assembly.
NVRAM chip failure with
system card assembly.
The Code ROM or NAND flash
failed the Cyclic Redundancy
Check (CRC) check or the
NAND experienced an
uncorrectible multi-bit failure.
Description/Action Possible repair actions
Warning: When replacing any
of the following components:
• Operator panel assembly
• System card assembly
Only replace one component at
a time. Replace the required
component and perform a POR
before replacing a second
component listed above. If this
procedure is not followed, the
printer will be rendered
inoperable. Never replace two
or more of the components
listed above without a POR
after installing each one or the
printer will be rendered
inoperable.
Never install and remove
components listed above as a
method of troubleshooting
components. Once a
component has been installed
in a machine, it can not be
used in another machine. It
must be returned to the
manufacturer.
Go to NVRAM mismatch failure
service check.
See "NVRAM mismatch
failure (950.00 through
950.29) service check" on
page 2-147.
Power the machine off/on to
reset the error condition.
Replace the operator panel
door assembly.
Go to "Operator panel door
assembly removal (T650,
T652, T654)" on page 4-43.
If problem remains, replace the
fuser unit assembly.
Go to "Fuser unit assembly
removal" on page 4-22.
Replace the system card
assembly.
Go to "System card
assembly removal" on
page 4-75.
Replace the system card
assembly.
Go to "System card
assembly removal" on
page 4-75.
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