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From: holtz%cascade.carleton.cdn%ubc.CSNET@CSNET-RELAY.ARPA (Neal Holtz)
Newsgroups: mod.computers.laser-printers
Subject: Varying print intensities: Canon LBP-CX print engine
Message-ID: <601:holtz@cascade.carleton.cdn>
Date: Sat, 30-Nov-85 13:01:59 EST
Article-I.D.: cascade.601:holtz
Posted: Sat Nov 30 13:01:59 1985
Date-Received: Mon, 2-Dec-85 06:17:16 EST
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Approved: laser-lovers@washington.arpa

We are printing a bit over 4000 pages per month on a LaserWriter,
almost all of it TeX documents -- almost all of those having
35mm margins on left and 25mm margins on other three sides.

Periodically when we print something that goes outside those
margins, there is a very noticeable decrease in text ``darkness''
where ever the text strays outside the normal margins.  Presumably,
the central part of the drum that sees more use gets slightly
different characteristics with age.  In fact I notice that documents
printed later in a cartridges life are considerabley darker than
those printed early, so that we usually end up turning the print
density down as we go along.

I guess a ``fix'' for the varying density would be to periodically
print some pages with dark borders in the region where the margins
normally are, but this looks like it might require a bit of
experimentation (i.e., how often is it necessary -- how many pages
are required to make the differences less noticeable, etc.)

Has anyone else experienced the problem?  Have you found a 
reasonable solution?