• Code: E749-0005
• Description: Booting instruction due to change in hardware configuration
  There is a change in configuration that requires turning OFF and then ON the power
• Remedy: The symptom is recovered by turning OFF and then ON the power

• Code: E749-0006
• Description: Restart direction due to configuration change.
  The option such as the Finisher and ADF was installed or removed when all of following conditions were met and the machine configuration is changed when the main power switch is turned ON. - Settings/Registration > Preferences > Timer/Energy Settings > Quick Startup at Power-on > ON - The Main Power Switch is turned OFF - The power plug of the machine is connected to the output.
• Remedy: It is recovered by turning OFF and then ON the main power. CAUTION This machine provides power to some PCBs even when in the main power OFF status. The power supply is not completely OFF by just turning OFF the main power switch and therefore, the machine is unable to detect a configuration change. When disconnecting and then connecting a connector, always disconnect the power plug. Refer to the Service Manual > Chapter 2 > External and Controls > Quick Startup for details

• Code: E750-0013
• Description: Mismatch between the DC Controller PCB and the Driver PCB
  Error in combination of the software of the DC Controller PCB with the electrical circuit
• Remedy: This symptom occurs when updating the software that does not match with the DC Controller PCB 1. Check the downloaded software and then execute downloading again 2. Replace the DC Controller PCB (UN09)

• Code: E753-0001
• Description: Downloading error
  Firmware update error This symptom occurs when trying to update the firmware of an option that is not installed
• Remedy: 1. Check the log to identify the location of the download error Check if the target option is installed When the target option is not installed: -> The symptom is recovered by turning OFF and then ON the power (because there is nothing to update) When the target option is installed: -> Check if the target option is properly installed and see if the software to download is for the correct target option, and then execute downloading again.

• Code: E804-0000
• Description: Power Supply Cooling Fan error
  Lock of the Power Supply Cooling Fan is detected
• Remedy: 1. Check power supply to the Power Supply Cooling Fan (FM1) 2.Replace the Power Supply Cooling Fan

• Code: E806-0001
• Description: Error detection of 3 Way Unit Cooling Fan
  When lock of the 3 Way Unit Cooling Fan was detected out for 15 sec
• Remedy: The Fan is physically locked or failed, or electrical trouble 1. COPIER > FUNCTION > PART-CHK > FAN; and then move FM04 When the 3 Way Unit Cooling Fan (FM04) works 2-1. Check the harness/connector between the DC Controller PCB (UN09) and the 3 Way Unit Cooling Fan (FM04) 3-1. Replace the 3 Way Unit Cooling Fan (FM04) 4-1. Replace the DC Controller PCB (UN09) When the 3 Way Unit Cooling Fan (FM04) does not work 2-2. Turn the 3 Way Unit Cooling Fan (FM04) with your hand to check for rotation of the fan 3-2. Check the harness/connector between the DC Controller PCB (UN09) and the 3 Way Unit Cooling Fan (FM04) 2. Check conduction of FU11 in the DC Controller PCB (UN09) When the fuse is blown out 5-2-1. Replace the DC Controller PCB (UN09) When the fuse is not blown out 5-2-2. Replace the 3 Way Unit Cooling Fan (FM04) 6-2-2. Replace the DC Controller PCB (UN09)

• Code: E807-0001
• Description: Error detection of Drum Unit Cooling Fan
  Lock of the Drum Unit Cooling Fan was detected out for 15 sec
• Remedy: The Fan is physically locked or failed, or electrical trouble 1.COPIER > FUNCTION > PART-CHK > FAN; and then move FM07 When the Drum Unit Cooling Fan (FM07) works 2-1. Check the harness/connector between the DC Controller PCB (UN09) and the Drum Unit Cooling Fan (FM07) 3-1. Replace the Drum Unit Cooling Fan (FM07) 4-1. Replace the DC Controller PCB (UN09) When the Drum Unit Cooling Fan (FM07) does not work 2-2. Turn the Drum Unit Cooling Fan (FM07) with your hand to check for rotation of the fan 3-2. Check the harness/connector between the DC Controller PCB (UN09) and the Drum Unit Cooling Fan (FM07) 4-2. Check conduction of FU9 in the DC Controller PCB (UN09) When the fuse is blown out 5-2-1. Replace the DC Controller PCB (UN09) When the fuse is not blown out 5-2-2. Replace the Drum Unit Cooling Fan (FM07) 6-2-2. Replace the DC Controller PCB (UN09)

• Code: E808-0001
• Description: Zero cross signal detection error
  Unable to detect 43 to 57Hz for 5000 msec or longer at the start of zero cross detection
• Remedy: Electrical trouble with failed zero cross signal 1. Check failure between the AC Driver PCB (UN14/ J122) and the DC Controller PCB (UN09/ J10). (trapped cable, open circuit, connector disconnection) -> Replace the part in the case of trapped cable/open circuit 2. Replace the AC Driver PCB (UN14) 3. Replace the DC Controller PCB (UN09) 4. Check the power supply condition at the customer site. When it is below 43 to 57Hz, ask for a construction work.