bull's eye!!! By-passing the VD-2 module seems to have brought us back in play.
Thank's a lot for the tip.
Now we need to figure out, whether it's a part on the circuit (which really is a simple one) or
whether it's the input to this circuit. If you have the schematics, do you happen to know,
where lines 1/2 and 7/8 come from? And what's the use of this small board, if the machine
seems to work without it?
Am 19 Mar 2018 um 13:00 hat Stuart Carter geschrieben:
> Hello Rudi:
> I think the problem that you have is with the VD-2 module. This is physically situated between
> the thermocouple amplifiers in the back of your analyser (behind the furnaces) and is housed in
> a similar package as the amplifiers. This provides the logic signals that voltage is present to the
> furnaces from the transformers.
> Please see attached circuit.
> This is a simple circuit so you should be able to make a repair and/or by-pass the unit.
> Good luck!
> With Kind Regards
> Stuart Carter
> Technical Director
> OEA Laboratories Limited
> Manufacturers of Advanced Materials for EA and EA/IRMS
> Trusted Expertise in Stable Isotope and Elemental Analysis
> Unit C2, Florence Road Business Park
> Kelly Bray, Callington, Cornwall, PL17 8EX, United Kingdom
> Tel +44 1579 384174, [log in to unmask]
Dr. Rudi Schäufele
Lehrstuhl fuer Gruenlandlehre
Technische Universitaet Muenchen
Alte Akademie 12