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From: MELNYK.WBST@XEROX.COM
Newsgroups: mod.computers.laser-printers
Subject: Re: Imagen 12/300 fan bug
Message-ID: <860130-065445-1309@Xerox>
Date: Thu, 30-Jan-86 09:54:00 EST
Article-I.D.: Xerox.860130-065445-1309
Posted: Thu Jan 30 09:54:00 1986
Date-Received: Sat, 1-Feb-86 01:48:10 EST
References: <8601240809.AA03798@a.CS.UIUC.EDU>
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Approved: laser-lovers@washington.arpa

Al you may be quite right about the fan being reversed on your Ricoh
print engines from Imagen. But I suggest that you double check with the
manufacturer.  I am not familiar with this machine, but in general,
xerographic machines including laser printers, filter the exhaust air to
remove the dry ink powders.  Higher speed copiers/printers even use
special (activated charcoal) filters to remove ozone generated by the
corona charging before exhausting into the room. The intake of this air
is usually filtered, but that depends on the design. The flow path is
first through the optics path at the photoreceptor (to keep the window
cleen on the laser ROS) then past the corotron charging and out between
charging and the cleaning housing (to remove stray ink leaking out of
the cleaner).  This airflow is separate from the cooling for the
electronics but may not be in a low cost design.

Andy Melnyk