• Code: 55.02
• Display: 55.XX DC CONTROLLER ERROR To continue turn off then on
• Description: The print engine is not communicating with the formatter.
  outgoing parity order
• Remedy: Turn the device off, and then turn the device on. Reseat all connectors on the dc controller and the formatter. Reseat the formatter. Check with HP support to find out if an applicable RFU is available. If it is, perform a RFU. If the error persists, replace the dc controller. If the error persists, replace the formatter.

• Code: 55.03
• Display: 55.XX DC CONTROLLER ERROR To continue turn off then on
• Description: The print engine is not communicating with the formatter.
  no engine response
• Remedy: Turn the device off, and then turn the device on. Reseat all connectors on the dc controller and the formatter. Reseat the formatter. Check with HP support to find out if an applicable RFU is available. If it is, perform a RFU. If the error persists, replace the dc controller. If the error persists, replace the formatter.

• Code: 55.04
• Display: 55.XX DC CONTROLLER ERROR To continue turn off then on
• Description: The print engine is not communicating with the formatter.
  communications timeout
• Remedy: Turn the device off, and then turn the device on. Reseat all connectors on the dc controller and the formatter. Reseat the formatter. Check with HP support to find out if an applicable RFU is available. If it is, perform a RFU. If the error persists, replace the dc controller. If the error persists, replace the formatter.

• Code: 55.06
• Display: 55.XX DC CONTROLLER ERROR To continue turn off then on
• Description: The print engine is not communicating with the formatter.
  dc controller NVRAM abnormal read/write or not accessible NOTE Check the Event log to distinguish between the two 55.01 errors above.
• Remedy: Turn the device off, and then turn the device on. Reseat all connectors on the dc controller and the formatter. Reseat the formatter. Check with HP support to find out if an applicable RFU is available. If it is, perform a RFU. If the error persists, replace the dc controller. If the error persists, replace the formatter.

• Code: 56.01
• Display: 56.XX ERROR To continue turn off then on
• Description: A temporary printing error has occurred.
  unknown input device, selected media input unavailable
• Remedy: 1. Turn the device off, and then turn the device on. 2. For 56.01 errors, check the connections to the input device (optional 1 x 500- or 3 x 500-sheet feeder.) For 56.02 errors, check the connections to the optional stapler stacker. 3. Remove all non-HP paper-handling devices. 4. Perform a RFU.

• Code: 56.02
• Display: 56.XX ERROR To continue turn off then on
• Description: A temporary printing error has occurred.
  unknown output device, selected media output bin unavailable
• Remedy: 1. Turn the device off, and then turn the device on. 2. For 56.01 errors, check the connections to the input device (optional 1 x 500- or 3 x 500-sheet feeder.) For 56.02 errors, check the connections to the optional stapler stacker. 3. Remove all non-HP paper-handling devices. 4. Perform a RFU.

• Code: 57.01
• Display: 57.XX ERROR To continue turn off then on
• Description: A temporary printing error has occurred. A fan has failed.
  duplexer fan
• Remedy: 1. For a 57.01 error, make sure that the connector J311 on the dc controller is firmly seated. 2. Check the connectors at the front or rear fan. Make sure that the fan blades can move freely. 3. Listen for the fans to operate while the device is initializing. 4. If a fan does not operate during the initialization sequence, replace it. You must replace the entire duplexer assembly for a failed duplexer fan.

• Code: 57.03
• Display: 57.XX ERROR To continue turn off then on
• Description: A temporary printing error has occurred. A fan has failed.
  fuser fan (front fan)
• Remedy: 1. For a 57.03 error, make sure that the connector J309 on the dc controller and the intermediate connector J51 are firmly seated. 2. Check the connectors at the front or rear fan. Make sure that the fan blades can move freely. 3. Listen for the fans to operate while the device is initializing. 4. If a fan does not operate during the initialization sequence, replace it. You must replace the entire duplexer assembly for a failed duplexer fan.