• Code: E743-0000
• Description: DDI communication error
  When the reader controller PCB has detected trouble in communication between the main controller PCB and reader controller PCB
• Remedy: Disconnect and re-connect the reader communication cable connector, or replace the reader controller PCB. Replace the main controller PCB.

• Code: E744
• Description: Language file/BootROM error
• Remedy: Upgrade the language file version.

• Code: E747
• Description: Main controller PCB error
• Remedy: Turn the main power OFF and back ON. Replace the main controller PCB (main). Disconnect and re-connect the main controller PCB (sub R)

• Code: E748
• Description: Main controller PCB error
• Remedy: Disconnect and re-connect the main controller PCBs (sub SJ, PE or R) or replace. Disconnect and re-connect the OPEN interface PCB or replace. Replace the main controller PCB (main).

• Code: E749-0001
• Description: Instruction to restart accompanying change in product configuration
  When the existing BootROM has been replaced with the BootROM of a different kind (when a PDL option was installed, etc.)
• Remedy: Reset by turning the main power OFF and back ON.

• Code: E749-1001
• Description: Instruction to restart accompanying change in product configuration
  Error where SDRAM memory as high as 1 GB remains although the controller board version is an old one
• Remedy: Check the combination of the main controller PCB and SDRAM.

• Code: E751-00Xx
• Description: Drum Unit / Faulty Connection of the Toner Receptacle See below X: reading=1, writing=2 x indicates color [Y=1, M=2, C=3, K=4]
  Trouble in the drum unit connections (trouble at the printer side)
• Remedy: Check the drum unit connections or replace the unit.

• Code: E751-01Xx
• Description: Drum Unit / Faulty Connection of the Toner Receptacle See below X: reading=1, writing=2 x indicates color [Y=1, M=2, C=3, K=4]
  Write error in the memory inside the drum unit
• Remedy: Check the drum unit connections or replace the unit.