LaserJet Pro MFP M477fdw PCL Font Issue After Firmware Upgrade to 20190712 - Need to Rollback

[Konstantinas]

Hi guys,

I can't use my LaserJet Pro MFP M477fdw CF379A printer normally since I upgraded its firmware to the latest version 20190712. Now most of my PCL fonts are printed like in economy mode where you can see a sharp border line of each symbol but inside the line each symbol is unfilled. I reset all printer settings and installed latest driver version but still having the same result. When I'm printing text as a picture it comes out all fine. Please help me to find a previous firmware version so I could rollback.

Thank you.

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Konstantin

[Valsimot]

I have in my archive firmware version 20160921 for M477 series Windows 7 64.

I used my test printer M477fdn first to upgrade to latest version 20190712 and then downgrade to 20160921 and downgrade works.

If you want I have uploaded it to my google drive here. You are downgrading your device on your own risk, HP doesn't recommend downgrading firmware.

[Konstantinas]

Hi Valsimot,

Thank you very much for your reply. I was able to downgrade my printer firmware but unfortunately this is not fixed my problem. I believe that you are having much more experience with a printers than I do. Below I made a photo of a Diagnostic Page where you can see the problem with the fonts. Can it be the issue with the other printer components like high-voltage power supply for example?

Diagnostics Page

[Valsimot]

You are having something black toner related, it could be something simple as defective toner cartridge, and next more complicated like high voltage, toner contacts, transfer belt, black laser...

The first step I would be trying is a different black toner cartridge that is the easiest.