• Code: E020-xx70
• Description: Concerning the first two digits of the details code in xx12 to xxD0 xx=01: Y xx=02: M xx=03: C xx=04: Bk
  Incorrect developer density target value which was set when the new drum unit was installed (value is extremely low)
• Remedy: Replace the drum unit (check its connections).

• Code: E020-xx80
• Description: Concerning the first two digits of the details code in xx12 to xxD0 xx=01: Y xx=02: M xx=03: C xx=04: Bk
  Density value is extremely high for the ITB surface reflectivity when the new drum unit was installed. SALT sensor trouble.
• Remedy: Replace the SALT sensor (clean the sensor window). Replace the drum unit (check its connections). Replace the ITB (clean it).

• Code: E020-xx81
• Description: Concerning the first two digits of the details code in xx12 to xxD0 xx=01: Y xx=02: M xx=03: C xx=04: Bk
  Density value is extremely low for the ITB surface reflectivity when the new drum unit was installed. SALT sensor trouble. Dirty ITB.
• Remedy: Replace the SALT sensor (clean the sensor window). Replace the drum unit (check its connections). Replace the ITB (clean it).

• Code: E020-xx83
• Description: Concerning the first two digits of the details code in xx12 to xxD0 xx=01: Y xx=02: M xx=03: C xx=04: Bk
  Trouble in detected ITB surface reflectivity rate (value is extremely high)
• Remedy: Replace the ITB (clean it).

• Code: E020-xxA0
• Description: Concerning the first two digits of the details code in xx12 to xxD0 xx=01: Y xx=02: M xx=03: C xx=04: Bk
  Measured value of the detected developer density is extremely low. Trouble in the ATR sensor. Trouble in the drum unit.
• Remedy: Replace the drum unit (check its connections).

• Code: E020-xxB0
• Description: Concerning the first two digits of the details code in xx12 to xxD0 xx=01: Y xx=02: M xx=03: C xx=04: Bk
  T/D ratio has dropped due to the drum unit end-of-life. Broken or disconnected wire in the ATR sensor.
• Remedy: Replace the drum unit (check its connections).

• Code: E020-xxB2
• Description: Concerning the first two digits of the details code in xx12 to xxD0 xx=01: Y xx=02: M xx=03: C xx=04: Bk
  T/D ratio is extremely high compared with when the new drum unit was installed.
• Remedy: Replace the drum unit (check its connections).

• Code: E020-xxB2
• Description: Concerning the first two digits of the details code in xx12 to xxD0 xx=01: Y xx=02: M xx=03: C xx=04: Bk
  T/D ratio is extremely high compared with when the new drum unit was installed.
• Remedy: Replace the drum unit (check its connections).