79.00.00LaserJet Pro M404dnHas video

Fix Error 79 (79.00.00) on HP LaserJet Pro M404dn

Error code 79.00.00 (Error 79) on the HP LaserJet Pro M404dn is a firmware exception error. It happens when the printer attempts to process a corrupt print job, incompatible PDF file, or unreadable command sequence sent over the network.

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Common causes

  • 1Corrupt print job sent across the network.
  • 2Incompatible print driver (e.g., mismatched PostScript or PCL version).
  • 3Malformed data packets sent during network printing.
  • 4Outdated firmware installed on the main formatter board.

Solutions

Steps to Fix Error 79.00.00 (Firmware Error)

This code usually stems from network print queue issues rather than hardware failure:

  1. Disconnect Network Cable: Unplug the RJ-45 Ethernet cable from the rear of the printer. If the printer boots up fine without network connectivity, a corrupt print job is trapped in the queue.
  2. Clear Print Spooler: Cancel and clear all pending documents in the print queue on all connected PCs or servers.
  3. Power Cycle the Printer: Turn off the printer, wait 30 seconds, and turn it back on with the network cable disconnected.
  4. Reconnect and Update Firmware: Reattach the Ethernet cable and run the HP Firmware Update utility from your computer or Embedded Web Server (EWS).

Steps to follow

  1. 1

    Disconnect the Ethernet cable

    Unplug the network cable to isolate the printer from incoming print requests.

  2. 2

    Clear pending print jobs

    Access Windows Devices and Printers to clear all documents in the print queue.

  3. 3

    Restart and update firmware

    Turn the printer back on, reconnect the network cable, and update the printer firmware via EWS.

Videos

Frequently asked questions

Complex vector elements or unsupported embedded fonts in a PDF can trigger a processing failure. Try selecting 'Print as Image' in your PDF reader settings.

Fix Error 79 (79.00.00) on HP LaserJet Pro M404dn | Vimazdev