• Code: 983
• Description: Duplicate toner cartridge detection error
  Multiple toner cartridges for the same color ware detected.
• Remedy: Install toner cartridges for specified colors at the proper positions.

• Code: 990
• Description: Waste toner sensor detection error
• Remedy: Is the K toner cartridge installed? Does the error occur again?
  Install the K toner cartridge. Be sure of cable connection, and then perform board replacement.

• Code: 991
• Description: TAG Color Information Error
  A tag of unsettled color information was detected.
• Remedy:

• Code: FFE, FFF
• Description: CU program error (203 to 214 do not occur in general use of the MFP)
  Invalid processing was performed with a CU program.
• Remedy: Replace the CU/PU board.