Chris Heapy wrote:
>
> Bert Mettier wrote:
> >
> > Ralph P. Pass III wrote:
> > >
> > > First, what does Pictorview say on the bottom right after you have tried to
> > > start cooling?
> > > Second (and no insult is implied) but are you sure you have the - sign on the
> > > temperature?
> > >
> > > I have never heard of this being a software problem.
> > >
> > > Ralph
> > >
> > > Bert Mettier wrote:
> > >
> > > > My Pictor 416 XT refuses to cool down and stays at ambient temperature
> > > > irrespective of the temperature I enter in the USER PREFERENCES or the
> > > > camera menue. I have been operating my system for more than a year
> > > > without many problems using a SCSI connection. Not until an otherwise
> > > > perfect ( for my state of expertise) picture of NGC 3628 showed an
> > > > unusual amount of "salt and pepper" sprinkled all over it did I notice
> > > > the too high temperature. Does this necessarily mean my peltier element
> > > > is faulty or could it possibly be a software problem ? I'm not aware of
> > > > having changed any parameters recently, however I once did reset the
> > > > pictor box to its default values. I am using Pview 6.44 but i have tried
> > > > other versions too, same problem.
> > > > Any ideas ?
> > > >
> > > > Bert Mettier
> >
> > The first temperature on the status bar reads the same as the setpoint,
> > about 2 degrees below ambient, the second figure is at ambient
> > temperature. The - sign is there.
> >
> > Bert
>
> Bert, if the first figure reads the same as the 'setpoint', then it's
> behaving correctly ?
>
> Lets try this again, what temperature do you have set for the 'default
> camera temperature' under User/Preferences? - what temperature does the
> camera actually reach and have you tried setting the temperature
> directly via the 'Camera/Set-Temperature' menu option?
>
> When the camera is first powered up, and the control box replies with
> '416XT Detected - Beginning cooldown', what is the reported percentage
> power consumption? - does it start high (100%) and then quickly reduce,
> or does it stay at 100%?
>
> The Peltier is solid-state, little to go wrong with it. If the head had
> been left unconnected for an extended period whilst the control box was
> powered up it's possible the output transistors blew.
>
> Chris Heapy
>
> --
> *Model Engineer Support Page*
> Engineering: http://easyweb.easynet.co.uk/~chrish/homepage.htm
> Astro Stuff: http://easyweb.easynet.co.uk/~chrish/lx200.htm

Chris,

The camera does not cool down irrespective of the temperature entered in
User Preference or Camera/set Temperature. The setpoint temperature
reads at approximately ambient temperature and the camera temperature
about 1-2° higher. Power consumption starts at 100% and then goes down
to about 30% after a short while. Actually, camera temperature goes up
slightly after a few minutes. This does not change, even if I set max
cooling in the camera menue. Looks like the 416 is due for the long
journey from Switzerland to California.

Bert

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