OT? Apple Stylewriter problems (longish)

From: jpero_at_sympatico.ca <(jpero_at_sympatico.ca)>
Date: Mon Jan 14 12:25:43 2002

> From: ard_at_p850ug1.demon.co.uk (Tony Duell)
> Subject: Re: OT? Apple Stylewriter problems (longish)
> To: classiccmp_at_classiccmp.org
> Date: Mon, 14 Jan 2002 19:16:07 +0000 (GMT)
> Reply-to: classiccmp_at_classiccmp.org

> >
> > All,
> > I'm having and creating trouble with my Stylewriter 1.

SW (no number 1) is early inkjet design w/ printhead ribbon rubbing
during print, mechanical parking, printhead worm driven. Wears out
too easily. SW2 and later, all later canons is much simpler
and driven by belt, parking station much reliable.

> >
> How many dots is this printhead? 25 connections could be 24 dots + common
> or sowething like that. I would have suspected 1 driver transistor per
> dot, though, and 9 dots seems very small for a modern-ish inkjet printer.

No. These canon inkjets I think is 32 or so nozzles and multiplexed
(ala memory array style.) Printheads, cartridge for canon and HP has
their IC built in by the nozzle on same die. Your nozzle test
prints, each step is one nozzle, any gaps is clogged jet or dead.

My friend w/ his original stylewriter decided to start printing
blanks even it didn't caught itself that cartridge isn't working even
cartridges were good. (!!) Good thing friend has spare printer to
fall forward on, SW1200, both cartridges from SW he has work fine in
SW1200. :-)

Epson injet printers printheads is two piece design, two dies mounted
directly to PCB and covered over with potting blobs is actual drivers
driven by 8 bit addressing and clock via white flat tape ribbon
cable. Two normally open switches for both tanks as gold pads made
closed by spring leaf tipped w/ plated gold when tank is seated.
Actual printhead itself is connected from that little vertical
circuit board and fired by pizeo not heat.

I knew this details because I did much tracing in 440 that blew it's
print-head fuse on the motherboard. Found printer head itself is
shorted.

Cheers,

Wizard

PS: Successfully unclogged 3 epson inkjet printers today w/ very
good results. The normal self cleaning is barely ok for minor
problems, I always had to resort to brutal unclog methods on epsons
that refuses to cooperate. Epson's printheads are about $100CDN.
Took me years to develop the correct methods because other normal
ways to deal with those epsons doesn't work at *all*. Aside from
that, these epsons are very cheap, mechanically is pretty good.
Received on Mon Jan 14 2002 - 12:25:43 GMT