Sharp MX-4100N Service Manual page 315

A0-21 Conflict firmware and EEPROM data
version (PCU)
Trouble content
Detail PCU
Cause Inconsistency between the PCU firmware version
and the EEPROM data version.
Check & Remedy Check the combination of the firmware.
A0-22 Conflict firmware and EEPROM data
version (SCU)
Trouble content
Detail SCU
Cause Inconsistency between the SCU firmware version
and the EEPROM data version.
Check & Remedy Check the combination of the firmware.
MX-5001N SELF DIAG AND TROUBLE CODE 7 – 29