<div dir="ltr">Hi Michael; I agree with John on his point number 2. Even a low 24V power supply can cause electronic malfunctions. They are easily replaceable.<div>Chris</div><div><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>Chris Malocsay</div><div>510-506-5894</div><div><div><br></div><div>Please Join us at the following upcoming events.</div><div><br></div></div><div><div><p style="margin:0px;font-stretch:normal;font-size:11px;line-height:13px;font-family:Arial,Verdana,Helvetica,sans-serif;color:rgb(82,82,82)"><br></p></div><div><a href="http://spie.org/conferences-and-exhibitions/optics-and-photonics/exhibition" target="_blank">Aug 28th- Sept 1st. SPIE Optics + Photonics in San Diego, CA</a><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
<br><div class="gmail_quote">On Wed, Aug 31, 2016 at 9:43 PM, John Shott <span dir="ltr"><<a href="mailto:shott@stanford.edu" target="_blank">shott@stanford.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p>Michael:</p>
<p>While I don't really know of a source that still services these
devices, I do have a couple of thoughts:</p>
<p>1. The institution with which I was formerly affiliated took a
MDA System 16 out of service in January 2012. Last I knew ... as
of late last year ... it was still sitting around in the
basement. While it has not been in service since January 2012, it
was fully functional at that time. You might want to contact Mary
Tang or Carsen Kline at Stanford to see if they would ship all or
part of it up the coast to you to see if that would get you over
your short term need. Of course, I can't guarantee that they
still have it or that they would be willing to part with it ...
but it's hard to imagine what plans one would have for such a
piece of equipment. It was used for 16 channels of hydride
detection.<br>
</p>
<p>2. Have you at least checked the main power supplies for ripple
with either an oscilloscope or a combination of AC and DC
voltmeters? Many "vintage" pieces of equipment with simple,
brute-force power supplied develop "bizarre" symptoms as their
electolytic capacitors dry out and lose the ability to store a
charge. I've brought many pieces of equipment back to life ...
even without circuit schematics ... by looking at the ripple on
the supposedly DC supplies and replacing two or three electolytic
capacitors. I expect that a number of the other members of this
community with extensive equipment diagnosis experience ... which
sounds better than saying "old timers" ... will agree that they
have solved many equipment problems in old equipment by simply
replacing the tired, old main electolytic capacitors in the DC
power supplies. While you may be well beyond this stage in your
own diagnosis, I would at least make sure that your problem could
not be solved by replacing $10 worth of electrolytic capacitors.
Of course, I should add the appropriate caution (which is not
needed in your case) that you need to exercise caution anytime you
have the cover off a piece of electronic equipment with 120 VAC
exposed ... particularly given the fact that if you are probing
the main DC supply your probes will be dangerously close to the
live, mains voltage. Note: my guess is that a few 10s of mV is
acceptable ripple ... but anything over a volt of ripple is
certainly problematic assuming that this piece of equipment used
either 24VDC or 15VDC supplies.</p>
<p>Good luck,</p>
<p>John<br>
</p>
<div>On 8/30/2016 5:37 PM, Michael Khbeis
wrote:<br>
</div>
<blockquote type="cite">
<div>Dear Colleagues</div>
<div><br>
</div>
<div>We are replacing our MDA system 16 in
the next 6-8 weeks and are having reoccurring glitches where the
MDA loses track of our hydrides monitoring module. This of
course triggers a fault in our HPM panel. Does anyone have a
point of contact for parts/repair of these legacy systems? We
need to limp along for just a few more weeks. </div>
<div><br>
</div>
<div>Gratefully, <br>
<br>
<div><span style="background-color:rgba(255,255,255,0)">Dr.
Michael Khbeis</span>
<div><span style="background-color:rgba(255,255,255,0)">Washington
Nanofab Facility<br>
University of Washington<br>
Fluke Hall, Box 352143<br>
(O) <a href="tel:206.543.5101" target="_blank">206.543.5101</a><br>
(C) <a href="tel:443.254.5192" target="_blank">443.254.5192</a><br>
<a href="mailto:khbeis@uw.edu" target="_blank">khbeis@uw.edu</a></span></div>
</div>
</div>
<br>
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