• Code: C0F30
• Description: Abnormally low toner density detected by Cyan ATDC Sensor
  Toner density that is 2 % or more lower than the target level is detected ten consecutive times during a print cycle, ATVC, or image stabilization sequence.
• Remedy: 1 ATDC Sensor window is dirty. YES: Clean. 2 ATDC Sensor spring moving part operates properly. NO: Correct. 3 Hopper supplies toner properly. NO: Correct. 4 ATDC Sensor LED is dirty. YES: Clean. 5 ATDC Sensor LED emits light properly. NO: Check connector for connection. Check harness. 6 Imaging Unit Shutter operates properly. NO: Correct. 7 The problem has been eliminated through the checks of steps up to 6. NO: Change Master Board.

• Code: C0F31
• Description: Abnormally high toner density detected by Cyan ATDC Sensor
  Toner density that is 4 % or more higher than the target level is detected ten consecutive times during a print cycle, ATVC, or image stabilization sequence.
• Remedy: 1 ATDC Sensor window is dirty. YES: Clean. 2 Bias voltage is properly applied to the ATDC Sensor window. NO: Check wiring. 3 The problem has been eliminated through the checks of steps up to 2. NO: Change Master Board.

• Code: C0F32
• Description: Abnormally low toner density detected by Magenta ATDC Sensor
  Toner density that is 2 % or more lower than the target level is detected ten consecutive times during a print cycle, ATVC, or image stabilization sequence.
• Remedy: 1 ATDC Sensor window is dirty. YES: Clean. 2 ATDC Sensor spring moving part operates properly. NO: Correct. 3 Hopper supplies toner properly. NO: Correct. 4 ATDC Sensor LED is dirty. YES: Clean. 5 ATDC Sensor LED emits light properly. NO: Check connector for connection. Check harness. 6 Imaging Unit Shutter operates properly. NO: Correct. 7 The problem has been eliminated through the checks of steps up to 6. NO: Change Master Board.

• Code: C0F33
• Description: Abnormally high toner density detected by Magenta ATDC Sensor
  Toner density that is 4 % or more higher than the target level is detected ten consecutive times during a print cycle, ATVC, or image stabilization sequence.
• Remedy: 1 ATDC Sensor window is dirty. YES: Clean. 2 Bias voltage is properly applied to the ATDC Sensor window. NO: Check wiring. 3 The problem has been eliminated through the checks of steps up to 2. NO: Change Master Board.

• Code: C0F34
• Description: Abnormally low toner density detected by Yellow ATDC Sensor
  Toner density that is 2 % or more lower than the target level is detected ten consecutive times during a print cycle, ATVC, or image stabilization sequence.
• Remedy: 1 ATDC Sensor window is dirty. YES: Clean. 2 ATDC Sensor spring moving part operates properly. NO: Correct. 3 Hopper supplies toner properly. NO: Correct. 4 ATDC Sensor LED is dirty. YES: Clean. 5 ATDC Sensor LED emits light properly. NO: Check connector for connection. Check harness. 6 Imaging Unit Shutter operates properly. NO: Correct. 7 The problem has been eliminated through the checks of steps up to 6. NO: Change Master Board.

• Code: C0F35
• Description: Abnormally high toner density detected by Yellow ATDC Sensor
  Toner density that is 4 % or more higher than the target level is detected ten consecutive times during a print cycle, ATVC, or image stabilization sequence.
• Remedy: 1 ATDC Sensor window is dirty. YES: Clean. 2 Bias voltage is properly applied to the ATDC Sensor window. NO: Check wiring. 3 The problem has been eliminated through the checks of steps up to 2. NO: Change Master Board.

• Code: C0F36
• Description: Abnormally low toner density detected by Black ATDC Sensor
  Toner density that is 2 % or more lower than the target level is detected ten consecutive times during a print cycle, ATVC, or image stabilization sequence.
• Remedy: 1 Image density is low. YES: Check and correct Imaging Unit Bk Shutter. 2 The problem has been eliminated through the check of step 1. NO: Check and correct Hopper. 3 The problem has been eliminated through the check of step 2. NO: Change Master Board.

• Code: C0F37
• Description: Abnormally high toner density detected by Black ATDC Sensor
  Toner density that is 4 % or more higher than the target level is detected ten consecutive times during a print cycle, ATVC, or image stabilization sequence.
• Remedy: 1 Imaging Unit Bk is installed correctly. NO: Reinstall. 2 Each of Imaging Unit Bk contacts makes good contact. NO: Clean or correct. 3 ATDC Sensor harness is open-circuited. YES: Change Imaging Unit Bk.Chan