[LargeFormat] Power supply for a Durst 450 CLS head.

[Peter Barry]

Thank you Gorges,
Fortunately the power supply is the simpler unstabilised version, and I 
think the problem may lie with the relay which I will upgrade to a more 
robust model.  If all else fails however, I will go with your suggestion of 
using a simpler 24 V supply!
...Pete

>From: Georges Giralt <georges.giralt at free.fr>
>Reply-To: f32 Large Format Photography Mail List <largeformat at f32.net>
>To: f32 Large Format Photography Mail List <largeformat at f32.net>
>Subject: Re: [LargeFormat] Power supply for a Durst 450 CLS head.
>Date: Fri, 08 Apr 2005 06:00:04 +0200
>
>Peter Barry a écrit :
>>Hi to all,
>>
>>The transformer which powers the 450 CLS head on my ageing Durst L1200 
>>enlarger has just had the last rites pronounced on it.  Replacement 
>>transformer units seem to be a little rare on the second hand market, so 
>>does anyone know how to rig up an alternative 24 V 450 W power supply?
>>
>>...Peter Barry
>Hi Peter !
>Is it the plain transformer supply or the Electronic stabilized power 
>supply ?
>If it is the first case, you will be able to change parts as they are 
>pretty simple and common.
>If it is the electronic stuff, and if the problem is not obvious, you may 
>be able to request a schematics from Durst in Italy (try to fill the 
>request form on their web site).
>If it has smoked beyond repair (it is now obsolete technology so difficult 
>to repair anyway) you may replace all the stuff inside except the proxy for 
>the head fan by a simple 24 V output transformer like the one used in 
>halogen lighting. Choose a toroidal one as they are better at hum and 
>efficiency and go to print. You will have to re wire the head connector if 
>you suppress all the electronic, but I've got the echematics somewhere, if 
>you need.
>Hope this helps
>P.S. keep in mind that the head fan is high voltage, mine is 220 V (a 
>European version, so you've to feed this voltage to the head) and that 
>you've to check the solderings in the head and in the conector. Bad solders 
>caused my power supply's fuse to blow.
>--
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