HP LaserJet M15w printing all black on BACK of page

[tcirstea]

I recently moved, and my printer is now printing grey/black on the whole back of the page. The front of the page prints normally. I tried doing the toner and fuser cleaning, and they had no effect other than having the back create fully black horizontal streaks on the portions of the page where the page moved slower. The imaging drum appears fully clean.
Shaking and rotating the cartridge did have a small amount of toner fall out.

[Rainbow23]

Hi @tcirstea,

Welcome to HP Support Community. This is a great place to post questions and find answers.
Thank you for posting your query, I will be glad to help you.

I see that your printer is printing grey/black on the whole back of the page

Please download and install the firmware update on the computer connected to the printer from this weblink.

You may also refer to this document to know how to update the firmware.

Let me know if this works.
Take care and have a good day ahead.

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