• Code: E020-xx24
• 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 SALT sensor. The fault can occur as when a new drum unit has been fitted. It is detected during ATR control or in about 150 sec after idle rotation of the developing assembly.

• Code: E020-xx25
• 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 SALT sensor. The ITB has deteriorated. The fault can occur as when a new drum unit has been fitted. It is detected during ATR control or in about 150 sec after idle rotation of the developing assembly.

• Code: E020-xx30
• 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 setting of the ATR sensor computation value is wrong. The drum unit is not fitted properly, 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.

• Code: E020-xx34
• 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 sample image fails to be drawn in ATR control. There is a fault/open circuit in the SALT sensor. The drum unit is faulty. The fault can occur as when a new drum unit has been fitted. It is detected during ATR control or in about 150 sec after idle rotation of the developing assembly.

• Code: E020-xx35
• 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 SALT sensor. The fault can occur as when a new drum unit has been fitted. It is detached during ATR control or in about 150 sec after idle rotation of the developing assembly.

• Code: E020-xx40
• 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 ATR sensor communication value is faulty. There is a fault/ open circuit in the ATR sensor. The drum unit has been fitted improperly. (The machine cannot detect the drum unit). The drum unit 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.

• Code: E020-xx50
• 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 computation value is faulty (set when a new drum unit is fitted). The fault occurs when an image is being formed. It is detected when toner supply operation is started.

• Code: E020-xx60
• 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 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.