Hello:
In the Mira system, if there is a clog in the cooling line, then the baseplate
temperature of the Verdi will read higher than it's regular value (an extra 1.0
Celsius is too much).
Don't forget to clean (vacuum) every air flow intake.
Good luck,
Sophie
____________________________________________________
Sophie M. K. Brunet, Ph. D.
Research Officer
Optical Spectroscopy, Laser Systems and Applications
Sessional Lecturer, CHEM 115
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306-966-1719 (office)   306-966-1702 (fax)
____________________________________________________
Saskatchewan Structural Sciences Centre
University of Saskatchewan
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Saskatoon, Sk   S7N 5C9
____________________________________________________


Quoting Craig Brideau <[log in to unmask]>:

> I had the chiller in my chameleon clog up a bit with gunk at one point
> and experienced a similar overheating problem.  In my case it was the
> entire system that was warming up.  I cleaned the chiller throughly
> and put proper no-growth solution in it which solved the problem.  If
> your readings are correct then only one of your diodes is getting
> warm, so you may have a local clog or other flow restriction in your
> cooling loop.  The other possibility is that a sensor is giving a
> false reading, or your diode may be shorting out and generating too
> much heat.
>
> Hope this helps!
>
> Craig
>
> On Tue, Jul 6, 2010 at 8:34 AM, Zoltan Cseresnyes <[log in to unmask]> wrote:
> > Dear List Members,
> > We have a laser per Subject Line on one of our LSM 510 systems.  Lately it
> > has been shutting itself off after a few minutes of lasing with an error
> > message indicating Diode 1 or Diode 2 temperature fault (fault codes 8 and
> > 12 for those who have similar systems).  I looked into the system via the
> > RS232 port with a hyperterminal and read out the fault history, as well as
> > the Diode 1 and 2 temperatures during a couple of start-up cycles with 1
> > reading per 2-3 seconds frequency (manually).  The values show a gradual
> > cool down of Diode 1 from 20.00 to 15.6 degrees in the course of a few
> > minutes (the Verdi current goes from 3.7 A to 50.0 A in the meantime), then
> > an individual reading of very high value (I saw values between 57 and 184
> > (!) C here, but only for one read-out point) and the following safety
> > shut-off of the system; a few occasional higher temperature readings can
> > also be observed after the shut-off, in the 30s and 40s C.  The cycle can
> be
> > repeated if we wait for about half an hour with the laser in Standby mode.
> >   Coherent installed this laser 10 months ago, when the previous unit had
> to
> > be replaced due to repeated failure to mode-lock.  The current unit is a
> > refurbished one, the head hours read out to be 1933 hours, whereas the two
> > diodes are 2470 hours each; we actually hardly ever use the laser, maybe
> > once or twice a week for a few hours each.  I would suspect a faulty
> > controller board that gives false temperature readings, but Coherent says
> it
> > may actually be the diode(s) and that would cost us 20 k EUR at least,
> > because we are out of warranty now.  The reasoning  on their behalf is that
> > the  refurbished unit didn't come with a new 1 year warranty.
> >   I would very much appreciate if those who had similar experiences would
> > share their opinion with me  as for the possible causes of this problem,
> the
> > likelihood of a failed diode after 2700 hours, and the warranty policy on
> > replacement lasers.  Any feedback will be much appreciated!  With best
> > wishes to you all,
> > Zoltan
> >
> >
> >
> > --
> > Zoltan Cseresnyes
> > Confocal and 2-Photon Microscopy Core Facility (MCF)
> > Max-Delbrück-Center for Molecular Medicine
> > Robert-Rössle-Str. 10
> > 13125 Berlin
> > phone: +49 (0)30 94062734
> > email: [log in to unmask]
> > http://www.mdc-berlin.de/en/research/core_facilities/index.html
>