[mod.computers.laser-printers] Uneven print density on LaserWriters?

per@chalmers.CSNET (Per Westerlund) (10/03/86)

Recently we got our first Apple LaserWriter.  While waiting for our
TranScript software we have written a terminal description for nroff to
simulate an older writer we have.  We were using the Courier font, but
thought the letters turned out to skinny on the right edge of the
paper, like they weren't "exposed" as much as the rest of the text.

I made a test-page, to see if the print density was even.  Just send
the small program

	initclip newpath clippath 0.6 setgray fill showpage

to the LaserWriter, and you should get a page with an even medium gray
tone all the way to the edges (almost), completely even.

I didn't.  The center area on the paper was rather even, but the edges
were noticeably lighter.  On the left, the lighter area extended into
about one inch from the paper-edge.  On the right, the lighter area
extended into about three quarters of an inch from the paper-edge.  (I
am using a4 paper, 8.27in x 11.69in).

Suspecting something was wrong, I went to my dealer.  I made my test
page on his LaserWriter, and got the same result!

What is this?  Have we gotten cartridges from a bad shipment, or do we
both have defect LaserWriters, or, heaven forbid, are the LaserWriter
designed to behave this way?  "They normally print only in the center
of the page, it doesn't matter if the density falls of at the edges, as
long as it is even in the center"?

			Per Westerlund
			Holistic Technology AB
			perw@holtec.UUCP
			per@chalmers.{UUCP,CSNET,SUNET}