HP 8750 leaves streaks each 3 inches

Hello

I have a HP Photosmart 8750 large-format printer that I had problems with during some time now.  When I print anything, regardless of the size, colour/black & white, or the type of paper the printer leaves streaks every 3 inches.  These trails are the paper outside sources in a horizontal direction.  I have attached a few photos so that you can see the results.  The first is a 12 x 12 inch (cut when I scanned a bit) image and the second is a 8.5 "x 11" text document where you see streaks on the lines that begin with 'any color... ' and 'coat of paint... ". "I installed the printer on a PC and a Mac and it does the same thing, so I'm sure this isn't a driver problem.  Does anyone have any ideas as to what is happening?  I'm at a point where I think I'm throwing the printer, but would like to know if there is some kind of fix for this.

Thanks a lot for any assistance!

Elke-

The cause is easy to describe, but may be difficult to solve.  There is a circular encoder disc that tracks where the book is such that it is powered by the roll.  This encoder must have an ink or similar task which is causing a "bunp" every revolution.  (Depending on the size of the main rollers 3 "spacing would be a revolution).

The solution is a little more difficult, and I have never had to do that so much of what follows is speculation.  You need carefully clean the disk encoder with flat water and perhaps a q-tip or a similar flexible element.  Cleaning precautions are similar to the band of coding of cleaning as described here, except the encoder disc is harder to do :-).  Now the hard part: the disk encoder is relatively well protected.  It is at the end of the roll bar on the left side of the printer.  I never disassemble this model so I won't be much help. Please take a look and see if you can understand something, post here and I can take mine on his perch and preview detailed.

Be careful when the unit of failover on the side or upside down, depends on the use that the printer had that may cause ink to overflow area service station on the right side.

Tags: HP Printers

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