LPL 7700 transformer issues

AgX · Aug 1, 2019

Yes, this a commom mains voltage connector.

(The third most common mains connector over here.)

If the male end is connected fixed to the power supply, the enlarger head thus having a female connector, there should not be a chance to feed mains voltage into the enlarger head.

Even then I doubt that such is the original connector set-up.

Jerevan · Aug 1, 2019

Otherwise, the halogen bulb arrived. I have checked the 10 A fuse and it looks fine. Tried the new halogen bulb (been trying to clean the ceramic contacts by taking the old bulb in and out a few times just to be sure). And still nothing. I guess we can assume that the transformer is dead, or worse it is dead AND the enlarger head is fried too.

AgX · Aug 1, 2019

As already hinted at, before making assumptions, have the shebang metered, best by an electrician.

You better not play with a weird, homemade power supply.

bdial · Aug 1, 2019

Most likely, the head is fine, and your problem is confined to the power supply.
12v is a very common target voltage for quite a number of devices the world over. Any sort of shop that repairs electronics should be able to fix things up for you.

Jerevan · Aug 2, 2019

At the moment I am sourcing another transformer, I'd rather set up the darkroom and make prints, actually.

Jerevan · Aug 2, 2019

voceumana said:
This transformer might be a good replacement for that entire power supply: http://www.farnell.com/datasheets/1...6.1514283126.1564204428-1485376122.1564204428

Since the manufacturer is German, it might be easy to find a distributor near you. Price in the USA is quite reasonable.

I have been able to source the Block ST 100/23/12 transformer mentioned above but I have to figure out what sort of enclosure/box (or whatever it might be called) the transformer has to be in, but my german language skills only stretch so far ...

AgX · Aug 2, 2019

Make something from plywood.

Jerevan · Aug 2, 2019

AgX said:
Make something from plywood.

Bastelzeit, juhuu!

AgX · Aug 2, 2019

Or two U-bent aluminium sheets forming a box.

voceumana · Aug 2, 2019

Be sure to provide air openings.

Jerevan · Aug 3, 2019

Thanks all of you for your time and efforts to help me out!

I have ordered a Block ST transformer and I am looking into box options at the moment.

Jerevan · Sep 9, 2019

The Block transformer is still on the work bench. Vacations and life in general got in the way. Meanwhile I happened to win an auction for another enlarger head that is supposedly working, together with a transformer. Good thing is that I get another negative holder (24x36) and this head has the fine focus knob.

Jerevan · Sep 13, 2019

So, finally, lights on! I got it all up and running. Yay!

MattKing · Sep 13, 2019

Wonderful!

LPL 7700 transformer issues

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