• Code: 52.20.00
• Display: 52.XX.00 Error
• Description: Laser/scanner errorer error
  Laser/scanner rotation error
• Remedy: Use the scanner motor (M10) drive test in the component test to test the motor. If the motor does not run, replace the laser/scanner assembly. NOTE: Listen for a high pitched whine from the motor. If the laser/scanner assembly has been removed or replaced, check the connectors (J831 and J832) on the laser-driver PCA and the connectors (J61 and J62) on the DC controller PCA.

• Code: 54.00.03
• Display: 54.XX.YY Error
• Description: A sensor error has occurred.
  Environmental sensor failure
  
• Remedy: 1. Turn the product off, and then on. 2. If the error persists, replace the environment sensor assembly. 3. If the environment sensor has been removed or replaced check the connector (J502) on the environment sensor and the connector (J33) on the DC controller PCA.

• Code: 54.00.06
• Display: 54.XX.YY Error
• Description: A sensor error has occurred.
  Registration density sensor failure
• Remedy: 1. Open and close the right door (or turn on and then off the power switch) to perform the color plane registration. 2. If the error persists, replace the registration density sensor assembly.

• Code: 54.00.14
• Display: 54.XX.YY Error
• Description: A sensor error has occurred.
  Registration density sensor failure
• Remedy: 1. Open and close the right door (or turn on and then off the power switch) to perform the color plane registration. 2. If the error persists, replace the registration density sensor assembly.

• Code: 54.00.19
• Display: 54.XX.YY Error
• Description: A sensor error has occurred.
  Registration density sensor failure
• Remedy: 1. Open and close the right door (or turn on and then off the power switch) to perform the color plane registration. 2. If the error persists, replace the registration density sensor assembly.

• Code: 54.01.05
• Display: 54.XX.YY Error
• Description: A sensor error has occurred.
  Media sensor is out of calibration range
• Remedy: 1. Turn the product off, and then clean the media sensor with a lint-free cloth. Turn the product on. 2. If the error persists, replace the paper pickup assembly.

• Code: 54.06.21
• Display: 54.XX.YY Error
• Description: A sensor error has occurred.
  Primary laser/scanner beam detect abnormality
• Remedy: 1. Turn the product off, and then on. 2. If the error persists, replace the laser/scanner assembly. 3. If the product has had parts removed or replace, check the connector (J61) on the DC controller PCA.

• Code: 54.0X.07
• Display: 54.XX.YY Error
• Description: A sensor error has occurred.
  Drum home position sensor failure
  X = 5 black, X = 6 cyan, X = 7 magenta, X = 8 yellow
• Remedy: 1. Turn the product off, and then on. 2. If the error persists, replace the main drive assembly. 3. If the product has had parts removed or replace, check the connector (J181) on the DC controller PCA.