• Code: 557
• Description: Zero cross frequency error
  Zero cross signals of wavelength 50-60 Hz were not detected within 5 seconds after the fusing relay switched on.
• Causes: AC line noise (High frequency)
• Remedy: • No action needed. • This SC will perform logging only. The machine will start up normally.

• Code: 559
• Description: Fuser 3 times jam error
  The paper jam counter for the fusing unit reaches 3. The paper jam counter is cleared if the paper is fed correctly. This SC is activated only when this function is enabled with "Engine Maintenance" (default "OFF").
• Causes: Paper jams at the fusing roller
• Remedy: • This SC cannot be reset by turning the power off and on. • This SP should be reset by a CE. • SP1159 determines whether SC559 is issued. The default is off. SC559 is not issued after three consecutive jams in the paper unit. If SP1159 is set to on, turning the machine power off/on does not reset the jam counter.

• Code: 622
• Description: Paper tray unit communication error bank 1
  Three consecutive errors occur during polling, after the paper tray unit has successful I2C communication.
• Causes: 1. Disconnect harnesses 2. Defective Paper tray unit 3. Defective engine board 4. External noise
• Remedy: • Turn the Power Switch Off and On. • Connect the harnesses properly. • Replace the Paper tray unit. • Replace the engine board.

• Code: 623
• Description: Paper tray unit communication error bank 2
  Three consecutive errors occur during poll`ing, after the paper tray unit has successful I2C communication.
• Causes: Turn the Power Switch Off and On. Connect the harnesses properly. Replace the Paper tray unit.
• Remedy: • Turn the Power Switch Off and On. • Connect the harnesses properly. • Replace the Paper tray unit.

• Code: 624
• Description: Paper tray unit communication error bank 3
  Three consecutive errors occur during polling, after the paper tray unit has successful I2C communication.
• Causes: Disconnect harnesses. Defective Paper tray unit. External noise
• Remedy: • Turn the Power Switch Off and On. • Connect the harnesses properly. • Replace the Paper tray unit.

• Code: 625
• Description: Paper tray unit communication error bank 4
  Three consecutive errors occur during polling, after the paper tray unit has successful I2C communication.
• Causes: Disconnect harnesses. Defective Paper tray unit. External noise
• Remedy: • Turn the Power Switch Off and On. • Connect the harnesses properly. • Replace the Paper tray unit.

• Code: 641
• Description: Engine-Controller Communication Error: Non-Response
  There was no response to a frame sent from the controller board to the engine. There is still no response after resending frames 3 times in 100 milliseconds
• Causes: Engine board defective. Engine board harness loose, broken, defective. External noise
• Remedy: 1. Turn the machine power Off and On. 2. Keep away from noise sources. 3. Replace the engine board harness. 4. Replace the engine board.

• Code: 669
• Description: EEPROM communication error
  The EEPROM was not connected at power on, or read/write operations on the EEPROM failed. Retrying 3 times after the error detection cannot recover from the error.
• Causes: External noise. Defective EEPROM
• Remedy: • Turn the Power Switch Off and On. • Replace the engine board (Replace the EEPROM).