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From: bp@www.zefox.net
Newsgroups: sci.electronics.repair
Subject: Re: HP printer trouble
Date: Fri, 18 Apr 2025 01:28:34 -0000 (UTC)
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Carlos E.R. <robin_listas@es.invalid> wrote:
> 
> Problem is, reaching that roller is very hard. I might have to open up 
> the printer, risking not been able to assemble it again.

What have you got to lose, given the state of the printer? 

The suggestion of wetting a sheet of paper with your choice of solvent
sounds worth a try, at minimum.

It isn't necessary to take the rollers out, just access them enough
to squirt solvent on them. One of the long-reach nozzled found on 
aerosol brake or carb cleaner will at least help. If you can wipe
them off that'd be better of course.

The idea of a faulty paper sensor didn't cross my mind. I didn't think
they'd be mechanical, but in any case they're worth looking for. A bit
of lint on a photocell could conceivably be the culprit. 

Thanks for reading,

bob prohaska