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HP Customer Support - Knowledge Base

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HP LaserJet Pro - 79 Errors

Issue:

One of the following errors is displayed on the printer's control panel:

Solution: 79 Error Turn off then on

  1. Turn the printer power off, wait at least 30 seconds, and then turn the power on and wait for it to initialize.
  2. If you are using a surge protector, remove it and plug the printer directly into the wall socket. Turn the printer power on.
  3. If the message persists, disconnect any network or USB cables and power cycle. If the printer returns to Ready, check the firmware version and update if a newer version is available.
    For instructions on updating the firmware, go to HP LaserJet Pro - Update the printer firmware.
    note:
    The firmware version can be found by printing a Configuration Report from the control panel of your printer. Visit the HP Customer Support Drivers page to find the latest firmware version available.
  4. If the error is intermittent, attempt to isolate the issue to something specific in your environment.
    1. Delete all print jobs from all computers connected to the printer and send a simple test print job.
  5. If the message persists, please contact HP Customer Support.

Solution: 79 Service error Turn off then on

  1. Turn the printer power off, wait at least 30 seconds, and then turn the power on and wait for it to initialize.
  2. If you are using a surge protector, remove it and plug the printer directly into the wall socket. Turn the printer power on.
  3. If the message persists, disconnect any network or USB cables and power cycle. If the printer returns to Ready, check the firmware version and update if a newer version is available.
    For instructions on updating the firmware, go to HP LaserJet Pro - Update the printer firmware.
    note:
    The firmware version can be found by printing a Configuration Report from the control panel of your printer. Visit the HP Customer Support Drivers page to find the latest firmware version available.
  4. If the error is intermittent, attempt to isolate the issue to something specific in your environment.
    1. Delete all print jobs from all computers connected to the printer and send a simple test print job.
  5. If the issue persists, remove any installed DIMMS and retest.
    1. If the printer prints fine, install a DIMM that the product supports.
  6. If the message persists, please contact HP Customer Support.

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