• Code: E12
• Description: Top Output Tray is Full, Unload Paper
• Remedy: 1 Visually inspect the Stack Full Actuator and use service diagnostics to test the Stack Full Sensor. Does the sensor and actuator operate correctly? Go to step [3]. Replace the actuator if broken. If the sensor is not working, go to step [2}. 2 Check Pin 6 OPTN cable at the Engine Controller Board for +5 volts. Replace the Engine Controller Board. Go to step [3]. 3 Check the Stack Full Sensor wiring harness to the Toner Sensor Board Pin 3 for +5 volts. Go to step [4]. Replace the Stack Full Sensor and wiring. 4 Check for +5 volts at Pin 6 OPTN cable to the Toner Sensor Board. Replace the ribbon cable (OPTN) Replace the Toner Sensor Board.

• Code: T1, T2
• Description: T1: Fuser Upper Failure T2: Fuser Lower Failure
• Remedy: 1 Reseat the Fuser Unit. Did the error reappear? Go to step [2]. Complete 2 Check the resistance of the lamps. See “Fuser Roller Resistances” on page 3-75 Go to step [3]. Replace the Fuser. 3 Check the Fuser thermistors. Are the thermistors damaged or misaligned, not in contact with the rollers? Replace the Fuser. Go to step [4]. 4 Is there AC voltage to the low voltage power supply CN1 connector? Replace the Engine Controller Board. Replace Low Voltage Power Supply.

• Code: T29
• Description: Temp Sensor Failure
• Remedy: 1 Use Service Diagnostics to check the current ambient humidity inside the printer. Verify proper operation of the sensor by blowing on it. Is the sensor operating correctly? See “Environmental Specifications” on page 1-15. Is the printer operating temperature within its optimal range? Replace the Temp/Humidity Sensor Board Replace the Engine Controller Board. Notify customer of the environmental specifications.

• Code: T30
• Description: RH Sensor Failure
• Remedy: 1 Use Service Diagnostics to check the current ambient humidity inside the printer. Is the sensor operating correctly? See “Environmental Specifications” on page 1-15. Is the printer operating humidity within its optimal range? Replace the Temp/Humidity Sensor Board. Replace the Engine Controller Board. Notify customer of the environmental specifications.

• Code: T32
• Description: LED Over Temperature Failure
• Remedy: 1 Check for proper clearances around the printer and ensure proper fan operation. Go to step [2]. Advise customer on clearance for the printer. Replace an inoperable fan. 1 Verify the ribbon cables and wiring harness to the LED are properly seated and not crimped or damaged down to the Engine Controller Board. Reseat or replace damaged wiring harness. Replace in the following order: LED Engine Controller Board.

• Code: T34
• Description: IU Motor Overheating Failure
• Remedy: 1 Cycle power to the printer. Does the error still appear? Go to step [2]. Complete. 2 Inspect the Electrical Card Cage Fan for proper operation and adequate airflow. Is the fan operating and installed correctly? Replace the Engine Controller Board. Replace the Electrical Card Cage Fan.

• Code: U0 ... U5
• Description: U0: Engine ROM Failure U1: Engine RAM Failure U2: Engine EEPROM Failure U3: Engine EEPROM Missing Failure U4: Engine SRAM Failure U5: Engine Control Failure
• Remedy: 1 Cycle power to the printer. Does the error still appear? Go to step [2]. Complete 2 Perform an NVRAM Reset. Does the error still appear? Replace the EEPROM for U2 or U3 errors. Replace the Engine Controller Board. Complete

• Code: U12
• Description: Duplex Interface Failure
• Remedy: 1 Remove the Duplex Unit and cycle power to the printer. Does the error still appear? Replace the Engine Controller Board. Go to step [2]. 2 Inspect the Duplex Unit and connector. Is the connector damaged or defective? Replace the Duplex Unit. Go to step [3]. 3 Inspect the wiring harness from the Duplex Unit to the Engine Controller Board for defects. Replace Engine Controller Board Replace wiring harness or connector.