[Frameworks] Seeking Projector Manual (Eiki EX-2000A)

[Els van Riel]

though 4000 is not 2000, this one might help:

http://acofs.org.au/part_5_files/Eiki/Tech%204000P%20Xenon.PDF <http://acofs.org.au/part_5_files/Eiki/Tech%204000P%20Xenon.PDF>

I use a few layers of heat-shrink tubing to repair the focus knob.

best regards,
Els



On 19 Sep 2017, at 04:34, Steve Polta <steve.polta at gmail.com> wrote:

Ok ok.
This is fun.
But I'm really looking for info on the lamp's focusing knobs. Specifically on the white plastic cover that covers the knob that controls how close/far the lamp is to/from the lens/screen. Even more specifically I'm wondering if the loss of this plastic cap (like for example if it melted due to heat) is a big deal.

Asking for a manual was sort of a bonus (to myself/Cinematheque) because once we had one, lent it, and didn't get it back.

Anyone plastic cap folks out there?

Steve

On Sep 18, 2017 7:22 PM, "Scott Dorsey" <kludge at panix.com <mailto:kludge at panix.com>> wrote:
What's wrong with the xenon lamp circuitry?

It should be a constant current source, combined with a little high voltage
supply to strike the lamp.  When the high voltage pulse makes the thing arc
over, the plasma between the contacts is conductive so all of a sudden the
thing turns into a low resistance device and it only takes a couple hundred
volts for the arc to be sustained.  The constant current source means that
the thing remains at the correct operating point as the electrodes slowly
burn away.

I _think_ that the EX-2000A uses trick magnetics to do the job... it's a
big saturable reactor that acts as an AC constant current source, then
rectifiers to turn it into DC, and then a filter capacitor made with
multiple capacitors and inductors in a chain to eliminate the ripple.

You could talk to Steve Guttag, I know he has worked on those occasionally.
There isn't much to fail non-catastrophically.
--scott
_______________________________________________
FrameWorks mailing list
FrameWorks at jonasmekasfilms.com <mailto:FrameWorks at jonasmekasfilms.com>
https://mailman-mail5.webfaction.com/listinfo/frameworks <https://mailman-mail5.webfaction.com/listinfo/frameworks>
_______________________________________________
FrameWorks mailing list
FrameWorks at jonasmekasfilms.com
https://mailman-mail5.webfaction.com/listinfo/frameworks

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman-mail5.webfaction.com/pipermail/frameworks/attachments/20170919/1c0e8b02/attachment.html>