• Code: 70 ... 73
• Description: Imaging Unit [1] [2] [3] [4] Communications Failure, Code 70, 71, 72, 73
• Causes: • Imaging Unit • Imaging Unit Plate Assembly
• Remedy: 1 1. Replace the imaging unit reporting the error. 2. Does the error still appear? Go to step 2. Complete. 2 1. Remove the imaging unit from the problem location and inspect the connector. 2. Is the connector damaged? Replace the imaging unit plate assembly. Troubleshoot the wiring. If wiring is OK, replace the engine control board.

• Code: 78
• Description: Waste Cartridge Full Detection Sensor Failure, Code 78
• Causes: • Waste Cartridge • Waste Cartridge Full Sensor • Engine Control Board
• Remedy: 1 1. Remove the waste cartridge sensor holder without disconnecting the harnesses. 2. Measure the voltage between the yellow wire on the waste cartridge full sensor and frame ground, alternately interrupting the sensor. 3. Does the voltage toggle between +5 and 0 VDC? Go to step 5. Go to step 2. 2 1. Measure the voltage between the gray wire and frame ground. 2. Does the voltage measure +5 VDC? Go to step 4. Go to step 3. 3 1. Remove the rear cover and rear shield. 2. Measure the voltage at J407B-17 on the engine control board. 3. Does the voltage measure +5 VDC? Inspect the wiring harness for damage and replace, if necessary. Replace the engine control board. 4 1. Measure the voltage between the violet wire and frame ground. 2. Does the voltage measure 0 VDC? Replace the waste cartridge full sensor. Inspect the wiring harness for damage and replace, if necessary. 5 1. Remove the rear cover and rear shield. 2. Measure the voltage at J407B-16 on the engine control board. 3. Alternately interrupt the sensor 4. Does the voltage toggle between +5 and 0 VDC? Replace the engine control board. Inspect the wiring harness for damage and replace, if necessary.

• Code: 80
• Description: Engine Logic Board Failure, Code 80
• Causes:
• Remedy: 1. Cycle power to the printer to clear the error. 2. Did this clear the error? Complete Replace the engine control board or the image processor board.

• Code: 81
• Description: Controller to Engine Communications Failure, Code 81
• Causes:
• Remedy: 1. Cycle power to the printer to clear the error. 2. Turn the printer off. 3. Remove the Image processor board, IP board cover and metal cover. 4. Inspect the orange ribbon cable between the relay board and the engine control board. 5. Is the connector fully seated and free from damage? Replace in the following order: • Image processor board • Electrical chassis assembly • Engine control board

• Code: 82
• Description: Engine Logic Board RAM/ROM Failure, Code 82
• Causes:
• Remedy: 1. Cycle power to the printer to clear the error. 2. Did this clear the error? Complete. Replace the engine control board.

• Code: 83
• Description: Engine Logic Board NVRAM Failure, Code 83
• Causes:
• Remedy: 1. Cycle power to the printer to clear the error. 2. Did this clear the error? Complete. Replace in the following order: • engine control board • image processor board

• Code: 84
• Description: Controller to Engine Logic Board Time Failure, Code 84
• Causes:
• Remedy: 1. Cycle power to the printer to clear the error. 2. Did this clear the error? Complete. Replace the engine control board.

• Code: 85
• Description: Engine Logic Board Micro Pitch Failure, Code 85
• Causes:
• Remedy: 1. Cycle power to the printer to clear the error. 2. Did this clear the error? Complete. Replace in the following order: • engine control board • image processor board