Errors - Konica Minolta bizhub 4020 Service Manual

4.6.12 940 errors

940 error messages
Error code Description
940.xx Controller to engine communication failure—the
zero crossing signal used for fuser control in the
low voltage (LV) power supply has failed, or the
wrong low voltage power supply has been
installed.
948.xx Failed controller board—pel clock check failed.
Replace the controller board.
949.xx Failed controller board—delay line calibration
failure.
4.6.13 950-958 errors
950-958 error messages
Error code Description
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
952.xx A recoverable NVRAM Cyclic Redundancy Check
(CRC) error occurred—n is the offset at which the
error occurred.
953.xx NVRAM chip failure with mirror part.
Replace the controller board.
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 uncorrectible multi-bit failure.
Replace the controller board.
bizhub 4020/3320 Service Manual
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Action
Go to LVPS service check.
Go to Controller board removal.
Go to Controller board removal.
Action
Go to NVRAM mismatch failure service
check.
Go to NVRAM cyclic redundancy service
check.
Go to Controller board removal.
Go to Controller board removal.
Go to Controller board removal.