Not DEC related but still hoping for some help: Problems w/ LJ 4+ Printer

Alexandre Souza alexandre.tabajara at
Tue Apr 2 15:08:01 CDT 2019

If I'm not mistaken, high voltage capacitors on power supply. The corona
wire isn't charging the paper, so the image doesn't get transfered from the
cylinder to the paper to be pressed/fused in the fusor.

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Em ter, 2 de abr de 2019 às 16:56, Ali via cctalk <cctalk at>

> I rescued a LaserJet 4+ printer that I have been trying to restore.
> Initially everything seemed ok and it seemed as if there may be just a bit
> of an issue with paper pickup which I attributed to old paper in the tray.
> However, soon I started getting the accordion paper jam which led me to
> replacing all the rollers including the transfer roller. Now the paper
> flows
> freely! However, I am having a new problem with printing. When I print, the
> first 5-10 pages initially come out blank. The printer does not produce any
> errors or error codes. The blank pages are warm (not hot though) as
> expected
> out of a LJ.
> After closer inspection it seems that the pages are printed SUPER light and
> gradually get darker the more I use the printer continuously. Eventually
> the
> printer starts printing continuous crisp black pages like new. This is a
> whole page phenomenon (i.e. not gaps, missing areas, etc.).
> A picture of the effect can be seen on VFC at:
> Sorry for the poor quality picture.
> Things I have checked/tried:
> 1. Using a brand new NOS toner (according to HP toner does not go bad as
> long as it was sealed - which this was)
> 2. Swapping the new transfer roller for the old one - same problem, I have
> to print out a bunch of pages until the printer starts acting normally.
> 3. I have checked the HV and an image is being transferred to the drum on
> the toner cartridge.
> 4. A visual inspection of the fuser shows it to be ok.
> Obviously this is happening printing demo pages so it has nothing to do
> with
> computer, OS, SW, drivers, etc. Anybody run into this before? Any
> ideas/suggestions. My Google fu turned up a bunch of discussions on the
> laser door not being aligned correctly but that would seem to be a more
> permanent issue i.e. unless you fixed the door no pages should print ever.
> Mine gets better on its own after a number of pages are printed. Plus the
> door and spring are fine - I checked them just in case.
> I tried posting on but for whatever reason the site
> was not accepting the question. Any other forums you guys would recommend?
> TIA!
> -Ali

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