Code :

Code: 50.5
Display: 50.5 FUSER ERROR
Description: The fuser has experienced a type-mismatch error.
Remedy: 1. Reinstall the fuser. Check the connector (J1901) between the fuser and the product. Replace the cable or fuser if the connector is damaged. 2. Reconnect the connectors of the fuser control PCA (J303, J305), low-voltage power-supply unit (J6), and the DC controller PCA (J102, J207). 3. Replace the fuser.

Code: 50.7
Display: 50.7 FUSER ERROR
Description: The fuser has experienced a pressure release mechanism error.
Remedy: 1. Reconnect the connectors of the fuser motor (J1720), fuser unit home-position sensor (J1965), intermediate (J1964), and the DC controller PCA (J105, J121). 2. Test the fuser pressure-release sensor by performing the paper-path test or the manual sensor test in the DIAGNOSTICS menu. 3. Check the sensor flag of the fuser pressure-release sensor. If the sensor flag is damaged, Replace the fuser. 4. Perform the fuser motor and fuser pressure-release-motor component tests in the DIAGNOSTICS menu. 5. Replace the fuser motor. 6. Replace the fuser.

Code: 50.8
Display: 50.8 FUSER ERROR
Description: The fuser has experienced a lowtemperature error.
Remedy: 1. Remove any paper jams from the fuser area. 2. Reinstall the fuser. Check the connector (J1901) between the fuser and the product. Replace the cable or fuser if the connector is damaged. 3. Reconnect the connectors of the fixing control PCA (J302, J303, J305) and the DC controller PCA (J107). 4. Replace the fuser. 5. Replace the fuser power-supply unit.

Code: 50.9
Display: 50.9 FUSER ERROR
Description: The fuser has experienced a hightemperature error.
Remedy: 1. Reinstall the fuser. Check the connector (J1901) between the fuser and the product. Replace the cable or fuser if the connector is damaged. 2. Reconnect the connectors of the fixing control PCA (J302, J303, J305) and the DC controller PCA (J107). 3. Replace the fuser. 4. Replace the fuser power-supply unit.

Code: 50.X
Display: 50.X FUSER ERROR
Description: A fuser error has occurred.
Remedy: Make sure you have the correct fuser. Reseat the fuser. Turn the product off, and then turn the product on. If this message persists, contact an HPauthorized service or support provider

Code: 51.20
Display: 51.20 ERROR
Description: The black laser (51.20) or cyan laser (51.21) has experienced an error.
Remedy: 1. Reconnect the connectors of the laser driver PCA (J501B) and the DC controller PCA (J127). 2. Replace the cyan/black laser-scanner unit.

Code: 51.21
Display: 51.21 ERROR
Description: The black laser (51.20) or cyan laser (51.21) has experienced an error.
Remedy: 1. Reconnect the connectors of the laser driver PCA (J501B) and the DC controller PCA (J127). 2. Replace the cyan/black laser-scanner unit.

Code: 51.22
Display: 51.22 ERROR
Description: The magenta laser (51.22) or yellow laser (51.23) has experienced an error.
Remedy: 1. Reconnect the connectors of the laser driver PCA (J501A) and the DC controller PCA (J126). 2. Replace the yellow/magenta laserscanner unit.