• Code: E020-xx70
• 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
  The developer concentration target value is faulty (set when a new drum unit is fitted; the value is extremely small). The fault occurs when an image is being formed. It is detected when toner supply operation is started.

• Code: E020-xx80
• 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
  The actual value is considerably high in relation to the ITB surface reflectance when a new drum unit is fitted. The SALT sensor is faulty. The fault occurs while ATR control is being executed.

• Code: E020-xx81
• 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
  The actual value is considerably high in relation to the ITB surface reflectance when a new drum is fitted. The fault occurs while ATR control is being executed.

• Code: E020-xxA0
• 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
  The measured value of the developer concentration is considerably low. The ATR sensor is faulty. The SALT sensor is faulty. The ITB is soiled. The fault occurs when an image is being formed. It is detected when toner supply operation is started.

• Code: E020-xxB0
• 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
  The drum unit is approaching the end of its life and is causing the T/D ratio to drop. The ATR sensor has an open circuit. The fault occurs when an image is being formed. It is detected when toner supply operation is started.

• Code: E020-xxC0
• 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
  The supply of toner for the toner container to the developing assembly is faulty. The developing assembly is supplied with toner excessively. The ATR sensor has an open circuit. The fault occurs when an image is being formed.

• Code: E020-xxD0
• 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
  The supply of toner for the toner container to the developing assembly has failed. The toner cartridge motor fails to rotate. The toner container is empty. The toner supply mouth of the drum unit is damaged. The ATR sensor has an open circuit. For the first 2 digits of detail code xxEE, xx=00: fault in access to drum unit xx=01: fault in access to toner container. The fault occurs when an image is being formed and, in addition, when the T/D ratio drops while 20 prints are being made continuously. It is detected when toner supply operation is started.

• Code: E032-0000
• Description: The counter of the NE controller fails to operate.
  The counter function of the NE controller fails to operate.