• Code: 009-910
• Description: Black Imaging Unit Type Mismatch Imaging Unit Type Mismatch.
• Remedy: Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Run the Imaging Unit Sensors test. The display is High. Y↓N→Check the wires and connectors. If the check is OK, replace the Black Imaging Unit (PL 4.1). Replace the Engine Control Board (MCU PWB) (PL 13.1).

• Code: 009-911
• Description: Cyan Imaging Unit Type Mismatch Imaging Unit Type Mismatch.
• Remedy: Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Run the Imaging Unit Sensors test. The display is High. Y↓N→Check the wires and connectors. If the check is OK, replace the Cyan Imaging Unit (PL 4.1). Replace the Engine Control Board (MCU PWB) (PL 13.1).

• Code: 009-912
• Description: Magenta Imaging Unit Type Mismatch Imaging Unit Type Mismatch.
• Remedy: Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Run the Imaging Unit Sensors test. The display is High. Y↓N→Check the wires and connectors. If the check is OK, replace the Magenta Imaging Unit (PL 4.1). Replace the Engine Control Board (MCU PWB) (PL 13.1).

• Code: 009-913
• Description: Yellow Imaging Unit Type Mismatch Imaging Unit Type Mismatch.
• Remedy: Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Run the Imaging Unit Sensors test. The display is High. Y↓N→Check the wires and connectors. If the check is OK, replace the Yellow Imaging Unit (PL 4.1). Replace the Engine Control Board (MCU PWB) (PL 13.1).

• Code: 009-920
• Description: Yellow Toner Cartridge Empty The Yellow Toner Cartridge is empty. This fault requires service only if the message appears before the Toner Cartridge is depleted.
• Remedy: Replace the Toner Cartridge (PL 6.1). If the problem continues, go RAP 009-410, Yellow Toner Cartridge Near Empty.

• Code: 009-921
• Description: Magenta Toner Cartridge Empty The Yellow Toner Cartridge is empty. This fault requires service only if the message appears before the Toner Cartridge is depleted.
• Remedy: • Ensure that there is toner and the toner is evenly distributed in the Magenta cartridge. • Check the Magenta ATC Sensor for blockage or contaminants. • Check the drive system from the Developer Drive Motor to the Magenta Developer Housing for damage. Procedure Replace the Toner Cartridge (PL 6.1). If the problem continues, go to RAP 009-411, Magenta Toner Cartridge Near Empty.

• Code: 009-922
• Description: Cyan Toner Cartridge Empty The Cyan Toner Cartridge is empty. This fault requires service only if the message appears before the Toner Cartridge is depleted.
• Remedy: • Ensure that there is toner and the toner is evenly distributed in the cartridge (C). • Check the Cyan ATC Sensor for blockage or contaminants. • Check the drive system from the Developer Drive Motor to the Developer Housing (C) for damage. Procedure Replace the Toner Cartridge (PL 6.1). If the problem continues, go to RAP 009-412, Cyan Toner Cartridge Near Empty.

• Code: 009-923
• Description: Black Toner Cartridge Empty The Black Toner Cartridge is empty. This fault requires service only if the message appears before the Toner Cartridge is depleted.
• Remedy: • Ensure that there is toner and the toner is evenly distributed in the Black cartridge. • Check the Black ATC Sensor for blockage or contaminants. • Check the drive system from the Main Drive Motor to the Black Developer Housing for damage. Procedure Replace the Toner Cartridge (PL 6.1). If the problem continues, go to RAP 009-413, Black Toner Cartridge Near Empty.