• Code: 980
• Description: Duplex controller hardware error 1
  
• Remedy: Indicates a communication problem between engine controller board and duplex unit. • Ensure that duplex cable is connected. • If cable is connected and error persists, replace duplex unit. • If replacing duplex unit does not clear error, replace engine controller board.

• Code: 982
• Description: Duplex controller hardware error 1
  
• Remedy: Indicates a communication problem between engine controller board and duplex unit. • Ensure that duplex cable is connected. • If cable is connected and error persists, replace duplex unit. • If replacing duplex unit does not clear error, replace engine controller board.

• Code: 983
• Description: Duplex motor error
  .
• Remedy: Indicates a blown motor-protective current fuse located on DCTL board in duplex unit. Replace duplex unit.

• Code: 984
• Description: Outer pass select solenoid error
  
• Remedy: Indicates a duplex solenoid problem. Replace duplex unit.

• Code: 985
• Description: Duplex connection error 1
  Indicates that there is a connection problem between the duplex unit and the low voltage power supply.
• Remedy: 1 Check duplex unit cable. is cable properly connected? Replace duplex unit. If problem persists, go to step 2. Properly connect cable. If problem persists, go to step 2.
  2 Check cable connection to connector ACN4 located on low voltage power supply. This will allow access to ACN4. Is cable properly connected? Go to step 3. Properly connect cable. If problem persists, go to step 3.
  3 Disconnect cable from ANC4 and check for continuity between ACN4 connector and duplex connector located on back of printer. Is there continuity? Replace low voltage power supply. Replace faulty cable.

• Code: 986
• Description: Duplex connection error 2
  Indicates that there is a connection problem between the duplex unit and engine controller board.
• Remedy: 1 Check duplex unit cable. is cable properly connected? Replace duplex unit. If problem persists, go to step 2. Properly connect cable. If problem persists, go to step 2. 2 Check cable connection to connector DPCN located on engine controller board. This will allow access to DPCN. Is cable properly connected? Go to step 3. Properly connect cable. If problem persists, go to step 3. 3 Disconnect cable and check for continuity between DPCN connector and duplex connector located on back of printer. Is there continuity? Replace engine controller board. Replace faulty cable.

• Code: 990
• Description: Transfer belt (transfer unit) error
  Indicates unstable transfer belt rotation; color matching cannot be secured.
• Remedy: 1 Open rear cover assembly and check transfer belt unit markers for stains. Are markers stained? Clean belt marker area with cotton cloth. If problem persists go to step 2. Go to step 2.
  2 Remove transfer belt unit and observe markers on side. Are belt markers deformed or does transfer belt Reinstall transfer belt unit. Go to step 3.
  3 Turn printer off and remove I/O board shield. Are cables DCN13 and DCN16 properly connected to I/O board? Go to step 4. Properly connect cables. If problem persists, go to step 4.
  4 Ensure rear cover assembly and front cover assembly are closed. Override top interlock switch and turn printer on. Wait until printer displays error and remove DCN16 from I/O board. Check for 5 VDC between DCN16 pin 1 (on I/O board) and ground (you can touch negative lead of voltmeter to metal bracket that holds I/O board to obtain ground.) Is voltage present and correct? I/O board is providing 5 VDC to marker sensor. Replace transfer belt marker sensor. Marker sensor is a part of bracket assembly. If problem persists, replace engine controller board. Go to step 5.
  5 Reconnect DCN16 and disconnect cable from DCN13. On cable, check for 5 VDC from pin 9 to ground (you can touch negative lead of voltmeter to metal bracket that holds I/O board to obtain ground.) Is voltage present and correct? LVPS is providing 5 VDC to I/O board. Replace faulty I/O board. Replace LVPS.

• Code: 991
• Description: Transfer roller clutch error
  Indicates a problem with transfer roller cable connection.
• Remedy: 1 Turn printer off and remove printer right cover. Disconnect transfer roller clutch from cable. Measure resistance between two outer pins on transfer roller clutch. Does resistance measure between 119 and 145 ohms? Go to step 2. Replace faulty transfer roller clutch.
  2 Remove I/O board shield. Disconnect cable from DCN10 on I/O board. Check cable continuity from DCN10 pins 7 and 8 (cable) to connector that attaches to transfer roller clutch. Ensure that pins are not shorted. Is cable okay? Replace I/O board. If problem persists, go to step 3. Go to step 3.
  3 Remove engine controller board shield. Check cable that connects I2CN on engine controller board to DCN3 on I/O board for proper connection, damage, pin shorting and continuity. Is cable okay? Replace engine controller board. Replace cable.