HP 2550L prints dirty bands on each page

F

Fernando Peral

Guest
The printer prints well, but it prints with a dirty band of near 2
centimeter width all across each page in the left part of it. For
example, printing in B&W a text page, i can read the text all over the
sheet, but the part of the band appears with a medium gray tone, darker
in the center of the band an lighter in the borders.

The drum is disty too. It has what i think is toner in the two roller,
the white roller and the light green roller. When i clean it completely
(with alcohol), it print well, without the band, sometimes just a few
pages, sometimes some hundres of pages, but in the end it begins to
print dirty again.

I think it may be the drum that it's bad, but i'm not sure. May be any
other part wich is getting the drum dirty? the drum is expensive enough
for not to change ir just for testing pourpouses.

any help?

thanks
 
"Fernando Peral" <fperal@NOSPAMpatagonmail.com> wrote in message
news:8jo7evFskbU2@mid.individual.net...
The printer prints well, but it prints with a dirty band of near 2
centimeter width all across each page in the left part of it. For example,
printing in B&W a text page, i can read the text all over the sheet, but
the part of the band appears with a medium gray tone, darker in the center
of the band an lighter in the borders.

The drum is disty too. It has what i think is toner in the two roller, the
white roller and the light green roller. When i clean it completely (with
alcohol), it print well, without the band, sometimes just a few pages,
sometimes some hundres of pages, but in the end it begins to print dirty
again.

I think it may be the drum that it's bad, but i'm not sure. May be any
other part wich is getting the drum dirty? the drum is expensive enough
for not to change ir just for testing pourpouses.

any help?

thanks
Click to expand...
Your problem could be the drum, but is much more likely to be the toner
cartridge.
 
Brenda Ann Inscribed thus:

"Fernando Peral" <fperal@NOSPAMpatagonmail.com> wrote in message
news:8jo7evFskbU2@mid.individual.net...
The printer prints well, but it prints with a dirty band of near 2
centimeter width all across each page in the left part of it. For
example, printing in B&W a text page, i can read the text all over
the sheet, but the part of the band appears with a medium gray tone,
darker in the center of the band an lighter in the borders.
Click to expand...
If the band is across the page its likely to be a drum problem.
If the band runs down the page its probably a toner problem.
Usually if there is a drum fault the band repeats itself several times
on the page.

The drum is disty too. It has what i think is toner in the two
roller, the white roller and the light green roller. When i clean it
completely (with alcohol), it print well, without the band, sometimes
just a few pages, sometimes some hundres of pages, but in the end it
begins to print dirty again.

I think it may be the drum that it's bad, but i'm not sure. May be
any other part which is getting the drum dirty? the drum is expensive
enough for not to change ir just for testing pourpouses.

any help?

thanks

Your problem could be the drum, but is much more likely to be the
toner cartridge.
Click to expand...
Taking the toner cartridge out and giving it a good side to side shake
often will clear bits of toner that has caught under the scraper blade.

--
Best Regards:
Baron.
 
Baron <baron.nospam@linuxmaniac.nospam.net> wrote in message
news:ib73tp$9bb$1@news.eternal-september.org...
Brenda Ann Inscribed thus:



"Fernando Peral" <fperal@NOSPAMpatagonmail.com> wrote in message
news:8jo7evFskbU2@mid.individual.net...
The printer prints well, but it prints with a dirty band of near 2
centimeter width all across each page in the left part of it. For
example, printing in B&W a text page, i can read the text all over
the sheet, but the part of the band appears with a medium gray tone,
darker in the center of the band an lighter in the borders.

If the band is across the page its likely to be a drum problem.
If the band runs down the page its probably a toner problem.
Usually if there is a drum fault the band repeats itself several times
on the page.

The drum is disty too. It has what i think is toner in the two
roller, the white roller and the light green roller. When i clean it
completely (with alcohol), it print well, without the band, sometimes
just a few pages, sometimes some hundres of pages, but in the end it
begins to print dirty again.

I think it may be the drum that it's bad, but i'm not sure. May be
any other part which is getting the drum dirty? the drum is expensive
enough for not to change ir just for testing pourpouses.

any help?

thanks

Your problem could be the drum, but is much more likely to be the
toner cartridge.

Taking the toner cartridge out and giving it a good side to side shake
often will clear bits of toner that has caught under the scraper blade.

--
Best Regards:
Baron.
Click to expand...

And rotating backwards a couple of turns
 
Baron wrote:

Brenda Ann Inscribed thus:



"Fernando Peral" <fperal@NOSPAMpatagonmail.com> wrote in message
news:8jo7evFskbU2@mid.individual.net...

The printer prints well, but it prints with a dirty band of near 2
centimeter width all across each page in the left part of it. For
example, printing in B&W a text page, i can read the text all over
the sheet, but the part of the band appears with a medium gray tone,
darker in the center of the band an lighter in the borders.


If the band is across the page its likely to be a drum problem.
If the band runs down the page its probably a toner problem.
Usually if there is a drum fault the band repeats itself several times
on the page.


The drum is disty too. It has what i think is toner in the two
roller, the white roller and the light green roller. When i clean it
completely (with alcohol), it print well, without the band, sometimes
just a few pages, sometimes some hundres of pages, but in the end it
begins to print dirty again.

I think it may be the drum that it's bad, but i'm not sure. May be
any other part which is getting the drum dirty? the drum is expensive
enough for not to change ir just for testing pourpouses.

any help?

thanks

Your problem could be the drum, but is much more likely to be the
toner cartridge.


Taking the toner cartridge out and giving it a good side to side shake
often will clear bits of toner that has caught under the scraper blade.

And while you do that, make sure there isn't a funny electronics and
Click to expand...
plastic putty stuff attached to it!
 
On Sun, 07 Nov 2010 18:54:42 +0100, Fernando Peral
<fperal@NOSPAMpatagonmail.com> wrote:

The printer prints well, but it prints with a dirty band of near 2
centimeter width all across each page in the left part of it.
Click to expand...
Ok. I decode that as a 2cm wide vertical strip. Since the 2550L is a
color laser printer, is this stripe any particular color? If it's
sorta light gray, then the problem is in the fuser roller assembly. If
you see a corresponding vertical stripe on the rollers or
corresponding burned area on the fuser film strip, it's time for a
rebuild.

For
example, printing in B&W a text page, i can read the text all over the
sheet, but the part of the band appears with a medium gray tone, darker
in the center of the band an lighter in the borders.
Click to expand...
Sounds like the fuser, not the drum.

The drum is disty too. It has what i think is toner in the two roller,
the white roller and the light green roller. When i clean it completely
(with alcohol), it print well, without the band, sometimes just a few
pages, sometimes some hundres of pages, but in the end it begins to
print dirty again.
Click to expand...
Also sounds like the fuser. If it were the drum, it would not respond
to cleaning. What's happening is that the burned area of the fuser
film strip is picking up and holding toner from the previous pages and
depositing it slowly on subsequent pages. The clue is the light grey
color, which is a mix of all the colors or a light application of
black toner. The darker area in the center is also a characteristic
of a burned stripe in the fuser film. You should be able to see it if
you remove the fuser and visually inspect it.

I think it may be the drum that it's bad, but i'm not sure. May be any
other part wich is getting the drum dirty? the drum is expensive enough
for not to change ir just for testing pourpouses.
Click to expand...
1. Search eBay for "hp 2550 fuser". Note the seriously overpriced
replacement films. My guess is that's what you need, but you may need
to look around for something more reasonably priced.

2. Ask the same question at:
<http://www.FixYourOwnPrinter.com>
You might get better answers in a printer specific forum.

3. Laser Printer printing defects:
<http://www.printertechs.com/tech/print-defects/print-defects-index.php>

4. If you're going to replace your own fuser film, you'll also need
some really high temp PTFE grease.
<http://www.fixyourownprinter.com/specials/misc/chemicals/S95>
Yes, that's $1 per gram.


--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 
On Nov 7, 9:54 am, Fernando Peral <fpe...@NOSPAMpatagonmail.com>
wrote:
The printer prints well, but it prints with a dirty band of near 2
centimeter width all across each page in the left part of it.
Click to expand...
A light leak, or a dirty corona wire, can do something like this.
Light leaks usually mean a case part is not closed properly.
The corona wire has a HV connection and is usually reachable (on
some models it's in the printer, on some it's part of the cartridge).
Alcohol on a cotton swab is appropriate.
 
On Tue, 9 Nov 2010 00:23:10 -0800 (PST), whit3rd <whit3rd@gmail.com>
wrote:

On Nov 7, 9:54 am, Fernando Peral <fpe...@NOSPAMpatagonmail.com
wrote:
The printer prints well, but it prints with a dirty band of near 2
centimeter width all across each page in the left part of it.

A light leak, or a dirty corona wire, can do something like this.
Light leaks usually mean a case part is not closed properly.
The corona wire has a HV connection and is usually reachable (on
some models it's in the printer, on some it's part of the cartridge).
Alcohol on a cotton swab is appropriate.
Click to expand...
Nope. A light leak will cause a blurry white stripe, not a gray
stripe. Since it's not focused, it's usually a fairly wide white
stripe. Unless the case is cracked, I haven't seen this on modern
laser printer designs. I have seen it when operating a laser printer
with the covers removed. The light leak is usually uneven, resulting
in a change of print density across the page. I place a cardboard box
over the printer to reduce the problem when running test prints.

A dirty corona wire will also cause a white, not gray, strip. Because
it's not focused or in direct contact with the paper, it tends to
create a blurry wide white stripe. The 2550L does not have the
traditional corona wire. It's built into the toner cartridges and has
morphed into either a corona strip or corona roller (I forgot which).

Common Laser Printer Problems
<http://www.poota.com/lpbook/10-chp10.html>

Learn how to troubleshoot and repair laser printers
<http://articles.techrepublic.com.com/5100-22_11-5140326.html>
See Fig E, which is what I think is the culprit.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 
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