• Code: 978
• Description: Bad Checksum While Programming Network Card
• Remedy: Software error.

• Code: 979
• Description: Flash Parts Failed While Programming Network Port
• Remedy: Reflash network port.

• Code: 980
• Description: Face Up/Down Switching Error
• Remedy: 1 POR the machine into diagnostics mode. Perform the output bin feed test on output bin 1. Can you hear the FU/FD solenoid move during the feed test? Check to see if linkage from the FU/FD solenoid to the FU/FD deflector is broken. Repair or replace the face-up unit. Go to step 2. 2 Is there continuity on the FU/FD deflector solenoid between pins 1 and 2 on CN 4 on the CK2 daughter board. Go to step 3. Replace the face-up unit. 3 Is CN 4 on CK2 properly connected? Go to step 4. Properly connect the connectors. 4 Are CN 3, CN 4, CN 5 on the printer controller board properly connected? Go to step 5. Properly connect the connectors. 5 Is fuse 1 on the printer controller board open? Replace the printer controller board and the drum eraser assembly. Replace the printer controller board.

• Code: 981
• Description: Belt Up/Down Sensor Error
• Remedy: 1 Is the engine code the latest level? Go to step 2. Update the printer with latest code level. If this does not resolve the problem, continue with step 2. 2 Are connectors CN409 and CN407 on the sensor board connected properly? Go to step 3. Plug the connectors in securely. 3 Are connectors CN11 on the CK1 daughter board, and CN15, CN3, CN4, and CN5 on the printer controller board connected properly? Go to step 4. Properly connect all connections. 4 Remove the transfer belt. Verify the belt up/down sensor actuator flag, on the bottom of the transfer belt unit is properly installed, not broken, and in the proper position. Rotate the shaft attached to the belt up/down sensor actuator flag. Are there any binds other than when engaging the transfer belt? Make sure the sensor is fully snapped in place, and that the sensor connector is fully seated. Are these items correct? Go to step 5. If the sensor is out of position or disconnected, properly install the sensor and properly connect the sensor to the belt unit. If the shaft attached to the belt up/down sensor actuator binds, replace the transfer belt unit. If the sensor actuator flag is broken, replace the transfer belt unit. 5 Clean the belt up/down sensor (located on the bottom of the transfer belt unit). Does this fix the problem? Problem solved. Go to step 6. 6 Disconnect the belt up/down sensor on the transfer belt unit, bypassing the density sensor and door open sensor. Power on the printer. Does the belt up/down shaft rotate during POST? Replace the transfer belt unit. Go to step 7. 7 Replace the transfer belt unit. Did this fix the problem? Problem solved. Replace the printer controller board.

• Code: 982
• Description: Sensor Controller Error
• Remedy: 1 Turn the printer off, and wait 30 seconds. Turn the printer on. Is error 982 displayed? Replace the printer controller board. Problem solved.

• Code: 983
• Description: Black Gear Sensor Error
• Remedy: 1 Is connector CN20 on the printer controller board connected properly? Go to step 2. Plug the connector in securely. 2 Check the cable running to CN20 for damage. Is the cable damaged? Replace the cable. Go to step 3. 3 Clean the gear sensor. Does this correct the problem? Problem solved. Go to step 4. 4 Replace the sensor card. Did this resolve the problem? Problem solved. Replace the drive unit.

• Code: 984
• Description: Yellow Gear Sensor Error
• Remedy: 1 Is connector CN20 on the printer controller board connected properly? Go to step 2. Plug the connector in securely. 2 Check the cable running to CN20 for damage. Is the cable damaged? Replace the cable. Go to step 3. 3 Clean the gear sensor. Does this correct the problem? Problem solved. Go to step 4. 4 Replace the sensor card. Did this resolve the problem? Problem solved. Replace the drive unit.

• Code: 985
• Description: Transfer Belt Thermistor Error
• Remedy: 1 Are connectors CN407 and CN411 on the sensor board connected properly? Go to step 2. Plug the connector in securely. 2 Is connector CN15 on the printer controller board connected properly? Replace the transfer belt unit. If the problem remains, replace the printer controller board. Plug the connector in securely.