24 Jan
2009
24 Jan
'09
1 p.m.
Thank you all for your great help!
[Dave McGuire, quoting me]
No; its physical extent is not as well-defined as a scratch is, and it
is (statistically) uniform under vertical translation, not repeating
with a well-defined period the way a scratch does.
However,
there's a vertical line of what I can perhaps best describe
as fog on every page. [...] Perhaps interestingly, this fog was
not present on the first few pages printed
So, the fog on the drum is a scratch,
or are you saying that there's a toner image of
the fog on the drum?
Yes. When I open the door over the roller, there are bands of fog
wrapped around the drum, in places that correspond to the fog on the
printouts.
Use a piece of tissue and (very!) carefully wipe at it
to see if it
comes off.
If it doesn't, then the drum is screwed,
It wipes off readily, and the stuff that wipes off looks like, well,
toner powder. But when I then put the cartridge back in and print a
test page, there is no recurring gap in the fog; apparently the
cleaned-off space didn't stay clean long enough to show on the page.
[dwight elvey]
There is also a [scraper] that can fail. If it gets
junk in it, it
will let toner get by and contaminate the PCR. It is a self
intensifying process.
That matches the symptoms. I'll try opening the toner cartridge and
cleaning off the PCR and the wiper blade - I could wreck it, I suppose,
but if my alternative is to get a new cartridge anyway... :)
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