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Recover Lost Admin Password for HP Color Laserjet 3800dn Printer

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Basic Information

The HP Color Laserjet 3800dn printer is a solid product and on the market since many years. Although it is not at the beginning of its product life cycle it is doing a good job in many offices. If the network cable is plugged in and the IP address of the printer is set and known it can be accessed by a web browser for further configuration.

At the right upper side of the web page there is a login link.


The Problem

Short: The password for the user „admin“ was lost and there was no way to log in on the web page of the printer!

Longer story: Recently a customer gave me the task to maintain a HP Color Laserjet 3800dn printer. The password of the user “admin” was not known by the customer and was not documented. After trying several password combinations we decided to carry out a factory reset of the printer. After the reset it was planned to set a new password and for sure note it for future maintenance.


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The Fix

The fix was to reset the printer to the default factory settings by carrying out the following steps:

  1. Turn off the printer, wait and turn the printer back on.

  2. Look at the display of the printer while the printer starts.

  3. The memory counts up and now press and hold the green button with the check mark symbol.

  4. Wait until the three LED’s are lighting and release the green button.

  5. Press “Down Arrow” button and select “Cold Reset”.

  6. Now the printer starts up again.

    Side Note: I had the problem that after a few minutes after starting up, the printer stuck on “calibrating”. I turned off the printer, unplugged the cables, waited two minutes and started the printer again. Finally the printer display showed the “Ready” state.

  7. Then I set again the same IP address on the printers display. Then I opened the web page of the printer in a browser.

  8. After all I set a secure, long and complex password on the web page of the printer and noted it for future maintenance.


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Conclusion

There was no other way to handle this problem. If the password is not known, only through a factory reset the printer can be recovered to regain full access to the printer.

I hope my short story helps other technicians which are in the same situation like I was.

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