Lexmark MS312, Service Manual, Page: 141 / 343

950–958 errors
950–958 error messages
Error code Description Action
950.xx NVRAM mismatch failure—mismatch between
controller board EEPROM and control panel mirror.
".xx" codes:
•
00-29— mismatch between system and mirror
•
30-60—mismatch between secure and system
Go to “NVRAM mismatch failure service check”
on page 141 .
952.xx A recoverable NVRAM Cyclic Redundancy Check
(CRC) error occurred—n is the offset at which the
error occurred. Go to “NVRAM cyclic redundancy service
check” on page 142 .
953.xx NVRAM chip failure with mirror part
Replace the controller board.
Go to “Controller board removal” on page
223 .
954.xx NVRAM chip failure with system part
Replace the controller board.
955.xx The Code ROM or NAND flash failed the Cyclic
Redundancy Check (CRC) or the NAND
experienced an uncorrectable multi-bit failure.
Replace the controller board.
956.xx RIP card failure—processor failure
Replace the controller board.
956.01 Processor temperature is over the limit.
Replace the controller board.
957.xx RIP card failure—ASIC failure
Replace the controller board.
958.xx Controller Board NAND Failure—printer has
performed more than 100 shift and reflash
operations as a result of ECC bit corrections.
Replace the controller board.
NVRAM mismatch failure service check
Warning—Potential Damage: When replacing any of the following components:
•
Control panel assembly
•
Controller board assembly
Replace only 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.
4514-330
Diagnostics and troubleshooting
141