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From: laser-lovers@uw-beaver
Newsgroups: fa.laser-lovers
Subject: dangerous lie in LaserJet service manual
Message-ID: <135@uw-beaver>
Date: Sun, 9-Dec-84 02:25:42 EST
Article-I.D.: uw-beave.135
Posted: Sun Dec  9 02:25:42 1984
Date-Received: Mon, 10-Dec-84 03:25:53 EST
Sender: daemon@uw-beaver
Organization: U of Washington Computer Science
Lines: 21

From: ihnp4!utzoo!henry@uw-beaver.arpa

>From section 3-3 of the service manual for the HP LaserJet:

	Ozone Filter

	One of the by-products of a corona discharge is the generation
	of ozone.  Ozone is a harmless form of oxygen which sometimes
	generates a pungent odor.  To remove the ozone generated by the
	corona assemblies the printer uses a charcoal absorbtion filter
	[located in the printer proper, not in the cartridge].

"Harmless"?!??!?  Somebody's been sniffing too much ozone!  Ozone is
**NOT** harmless; it is poisonous.  I find it a bit unsettling that the
ozone filter in the LaserJet (and hence in the Canon engine in general?)
is not mentioned anywhere as something that should be replaced from time
to time.  Does anybody know how long such a thing would last before being
in need of replacement?

				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry