Re: LaserJet 1012 Vertical Fade
- From: Bob Larter <bobbylarter@xxxxxxxxx>
- Date: Thu, 28 May 2009 23:12:12 +1000
Jeff Liebermann wrote:
On Sun, 24 May 2009 16:47:08 -1000, "John Keiser"
<john.keiser2@xxxxxxxxxxxxxxx> wrote:
Printer works well but has a "slight" faded vertical band about 3 inches from the left margin, about 1/4 inches wide. New cartridge.
Doing a "half self test" I can see slight fadeing on the drum at that location.
I surmise this means some issue with the laser mirror or lenses.
Normal cleaning cycle has not helped.
There are 3 possible causes of a shadow.
1. Toner cartridge, which you've eliminated.
2. Crud in the fuser assembly. This the most common.
3. Dust or dirt inside the laser scanner assembly. This can usually
be cleaned out with compressed air. Note that an obstruction to the
laser beam will create a vertical black band, not a faded band.
Woops! Good point, Jeff, I was forgetting that lasers "write white", not black. Dirt on the lens/mirror gives you shadows, not fades.
I have the service manual and am tempted to disassemble and gently clean the lenses [soft cloth/brush] but as this somewhat involved [and I could make the problem that I can "live with" worse]
It's not the laser scanner.
No, you're right.
I thought I should ask if (1) does my diagnosis sound right and (2) is there is any easier way to accomplish this cleaning short of complete disassembly.
Before you tear into the laser scanner assembly, check if there's a
corresponding 1/4" wide band on the fuser assembly. I'm fairly sure
that's where you'll find the problem, in the area of your "slight
fading".
Another typical symptom of a stripped fuser roller is that the toner also doesn't adhere properly to the paper in that area. Scratching the print in that area with your fingernail will often lift toner.
If you disassemble the fuser assembly, you'll probably find
a thermal sensor touching the drum in the exact area of the problem. I
don't recall exactly what it looks like in the 1012, but it usually
has a yellow mylar tape cover. This tends to collect toner, which
melts in place on the thermal sensor. That will eventually wear off
the coating from the drum, resulting in a faded area on the page,
exactly what you're getting. The clue is the 1/4" wide band. That's
the exact diameter of the sensor. Scrape off the melted toner from
the surface of the sensor, and it should work.
If the teflon coating has been scraped off the roller in that area, the roller will need to be replaced. Replacing the roller itself is a tricky job on most lasers. It might be possible to replace the whole fuser assembly with a refurbished unit.
Light reading:
<http://www.fixyourownprinter.com>
<http://www.printerworks.com>
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- References:
- LaserJet 1012 Vertical Fade
- From: John Keiser
- Re: LaserJet 1012 Vertical Fade
- From: Jeff Liebermann
- LaserJet 1012 Vertical Fade
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