hello all, this is my first post, hope not too silly. i recently bought a 2nd hand, very good condition, c7700 but i find that when i use the filtration it is moving the neg. i have secured the neg holder and thought i had the enlarger on a solid enough table. any ideas on this?driving me mad and wasting paper! :confused:regards june
lpl c7700 column moving
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RH Designs
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Which way is the neg moving? Losing focus, or moving side to side?
On Durst enlargers there is a tendency for the head to creep up the column after time, sometimes when the filters are adjusted the head gets moved fractionally. There are two friction pads that prevent this they wear and need adjustment occasionally.
The LPL should be similar, the heads are counter balanced by a spring to allow easy height adjustment, so look and see if there's some kind of adjustment. On the Durst it takes less than 30 seconds to tighten these friction pads.
Ian
The LPL should be similar, the heads are counter balanced by a spring to allow easy height adjustment, so look and see if there's some kind of adjustment. On the Durst it takes less than 30 seconds to tighten these friction pads.
Ian
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RH Designs
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Good point - on the LPL the big yellow knob on the right locks the head to the column as well as providing a means of moving it - make sure it's tightened after you 've moved the head.
On my LPL 7700 I have a handle on the left hand side - you twist that forwards or backwards to tighten it in to position, then the other way to loosen it so you can move it up and down. Kind of like adjusting acceleration on a motorcycle. A Pretty good system, I've found.
There's also a yellow switch/lever on the left hand side of the head too, you flick that forward to lock the negative carrier down into position. Apart from those two things, I'm not sure how adjusting the colour filters could be moving anything...I'll give mine a look in the morning, it's in a box in the shed right now.
There's also a yellow switch/lever on the left hand side of the head too, you flick that forward to lock the negative carrier down into position. Apart from those two things, I'm not sure how adjusting the colour filters could be moving anything...I'll give mine a look in the morning, it's in a box in the shed right now.
I have the LPL C7700 and the same problem of the head moving ever so slightly even though all the knobs are well tightened. After Stoo inspected my set up ; he found that it is the column that moves not the head as such, and that to avoid this problem, I should have a bracket fixed to the wall holding securely the top of the column. I have slented walls, I don't yet how I am going to go about doing that... but for my set up, this is the problem.
Thanks all, think the best thing I can do is secure the column to the wall behind, and just move the filtration wheels very, very slowly........!
RH Designs
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This puzzles me to be honest, because when I first got my c7700 I used it on the baseboard alone and found it quite stable. Sure it was better when secured to the wall, but if everything's nice and tight it shouldn't give you any trouble. Make sure the four allen bolts holding the column mount to the baseboard are tight, that the column is correctly seated in the mount, and that the big knob at the back is tight.
Richard the earlier C7700's were more unstable, a friend used one & had problems until he made a bracket for the top.
Ian
Ian
When I got mine a few years back I found the head seemed loose or unstable, turned out the top (which is removed to change the lamp) wasn't seated properly, a bit of black duct tape did the job as the two parts didn't want to sit together.
Marcus
Marcus
RH Designs
Advertiser
Oh, OK. I bought mine in 1987, I don't know whether that counts as "earlier" or not. But it would be quite straightforward to make a bracket - a standard shelf bracket would do. On mine at least the plastic cap on top of the column simply lifts off so could be drilled to attach it to the bracket. I was able to get some purpose made wall brackets from Quadro Photographic before they went out of business - they work really well and allow easy alignment.
Can you post a link of the type of brackets that you are talking about Richard?
Also, I have slented walls, how would I go about it with a standard shelf bracket?
Sorry for my plain ignorance
.. in the meantime, I stop breathing every time I change the filtration on the color head 
RH Designs
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Can you post a link of the type of brackets that you are talking about Richard?
Also, I have slented walls, how would I go about it with a standard shelf bracket?
Sorry for my plain ignorance
Hi Delphine,
Something like these. Non-vertical walls could be a bit tricky, although this type of bracket could be bent to suit I should think. It's a pity the Quadro ones aren't available any more, they are substantial and made for the job, but I'm sure off-the-shelf (sorry!) brackets would do just as well. If you search for "angle bracket" on the Wickes site I'm sure you'll find something suitable. Most general hardware shops will have something similar.
Delphine, you might want to try something like the following. Not the prettiest solution, but absolutely rock solid:
Brian
Brian
Why not an eyebolt or two in the wall & steel cable to help support the column? You could use a turnbuckle to adjust the tension of the cable. No not 1" cable either something like 1/8".
My creativity is fairly limited when it gets to DIY.
If I used a bracket, and somehow, managed to bend it to fit on the wall ; how do I go about fixing the column to it? Somehow I would drill and I put a knob thingy to the plastic cap? I have no leeway, I can't move the baseboard at all from its current position, and yet, I won't be able to adjust the depth of the bracket itself.
Sorry if I am hacking this thread....
If I used a bracket, and somehow, managed to bend it to fit on the wall ; how do I go about fixing the column to it? Somehow I would drill and I put a knob thingy to the plastic cap? I have no leeway, I can't move the baseboard at all from its current position, and yet, I won't be able to adjust the depth of the bracket itself.
Sorry if I am hacking this thread....
Hi, to brace the top of the column to the wall, all you need is two pieces of wood and some screws. Make a sort of a T shape, with one piece screwed to the wall horizontally, and the other at right angles coming out directly to the top of the enlarger post. For an angled wall, just make an L shape with the bracing piece connected to the end of the horizontal wall piece, so any angle would be possible. There should be a stop screw (and hole) near the top of column that you can use to connect to the bracing piece.
Jon
Jon
If you look at the top of the column at the back, you will notice a screw, If you look at the top picture that I posted the metal bracket is attached to the column using this screw. Means you don't have to start drilling holes or making special brackets.
Brian
Brian, where is the picture that you posted? I can't see a link nor a picture being posted in this thread.
RH Designs
Advertiser
I can see neither pictures nor links either Brian.
Hmm, have to try a different way.
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ah ! thank you Brian, I see how you go about it now. That makes sense.
I have food for thoughts. Thank you.
I have food for thoughts. Thank you.
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