Archived from groups: comp.periphs.printers (
More info?)
ato_zee@hotmail.com wrote:
>
> On 30-Mar-2005, Duane Bozarth <dpbozarth@swko.dot.net> wrote:
>
> > It fuses partially but is smudged (lengthening of characters, etc.) and
> > is not fully (but is partially) fused to the paper so it isn't totally
> > <un>fused. I'm unaware of precisely how to tell at what fraction the
> > lamp is/is not on. For certain the temperature of the exit page isn't
> > as high as it should be.
> If as I think, it's a Canon SX engine, flatbed, clamshell design, with
> a flap that can be lowered, then you can look through the exit flap,
> better in a dim room, and see the fuser lamp going on and off. At
> start up (from cold) it comes on for about 30 secs, then once
> warmed up for around 3 to 5 secs per minute. The lid needs to be
> closed so you have to view via the exit flap, though I think it's
> not too difficult to make an interlock cheater. From the back, I
> found looking to the right (left side of printer from the front) worked
> best.
>
> For the SX there is a well documented capacitor problem, on a
> board that is part of the AC power supply, which also houses
> the power triac, that turns the fuser lamp on and off, and the
> opto-switch that turns it, the power triac, on/off. The capacitor
> leaks a mildly corrosive electrolyte after a few years.
>
> Parts to fix at component level are cheap. 500W fuser lamp, linear
> quartz halogen, 5 UKPDS about 8 USD, triac a bit less, same for
> opto-coupler, even less for capacitor. The carriage cost me more
> than the parts. You need to be a techie to dismantle and replace the
> parts. There are online manuals and repair instructions, but you
> need to be familiar with desoldering components.
>
> To replace assemblies, both the AC power supply and the fuser
> are on four screws, though you need to take the cover off.
> I'd guess that your fuser is producing some heat, as the machine
> should give a fault indication if it doesn't see the fuser heating up
> at all. Old age can cause the pins of the modules to freeze in
> place and it may require more major dismantling to free them
> up. Excessive force is contra indicated.
OK, thanks...that provides significant additional info...
Yes, it is the Canon SX...it isn't actually the HP LJ II, it's a QMS
PS810, but physically the two are virtually idential--only a minor
difference in the control panel and the QMS firmware/PS engine. I used
the LJ as QMS being relatively rare, figured good chance would get no
response to it if mentioned it specifically...
I'm moderately capable, have eng'g degree which as my tech of manyu
years (and many others I've known as well) said only made us
collectively more dangerous than we otherwise would have been...
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