• Code: E004-0002
• Description: The protection circuit of the fixing unit is faulty.
  An open circuit of the temperature detection thermistor inside the non-contact thermistor is detected for 500 msec continuously.

• Code: E004-0003
• Description: The protection circuit of the fixing unit is faulty.
  A short circuit of the temperature detecting thermistor inside the non-contact thermistor is detected for 500 msec continuously.

• Code: E004-0004
• Description: The protection circuit of the fixing unit is faulty.
  An open circuit of the infrared detecting thermistor inside the non-contact thermistor is detected for 500 msec continuously.

• Code: E004-0005
• Description: The protection circuit of the fixing unit is faulty.
  A short circuit of the infrared detecting thermistor inside the non-contact thermistor is detected for 500 msec continuously.

• Code: E012-0001
• Description: The drum ITB motor is faulty. The ITB drum motor fails to rotate.
  The lock (normal state) signal is not detected within 2 sec after the ITB drum motor control signal has gone ON or the motor speed has been changed.

• Code: E012-0002
• Description: The drum ITB motor is faulty. The ITB drum motor fails to rotate after it has rotated.
  The lock (normal state) signal stops 0.5 sec later.

• Code: E012-0003
• Description: The drum ITB motor is faulty.
  The lock (normal state) signal remains even when the ITB drum motor has been stopped (i.e., the lock (normal state) signal is detected continuously for 2 sec after the ITB drum motor control signal has been turned OFF).

• Code: E020-xx20
• Description: There is a fault associated with the drum/developer. For the first 2 digits of detail code xx12 through xxD0, xx=01: Y xx=02: M xx=03: C xx=04: Bk
  There is a fault/open circuit in the ATR sensor. The drum unit is not fitted normally, or is faulty. The fault can occur as when a new drum unit has been fitted. It is detected in about 90 to 120 sec after idle rotation of the developing assembly.