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Screen Making / Re: Screen Room LED's
« Last post by ebscreen on Yesterday at 05:50:57 PM »
We had high bay led's in the last shop, could definitely see those exposing screens. The lights we just installed are
only 40 watts, basically a replacement for drop ceiling fluorescent troffers. I'm crossing my fingers that it's not an issue.
Gonna do the quarter test for 8 hours tomorrow, we use diazo emulsion so it's both slow exposing and very obvious
when it is exposed.

The only place I've been able to find amber/rubylith rolls is on ebay, and those people think the stuff is made out of gold or something.
If we end up needing a filter I'll probably just order more of the welding-safe strip door we just installed, it would be kind of perfect.

Hoping we don't need it though, I can not stand working in yellow light. I'm not even in the screen room that often but it irks the eff out of me.
Anyone else have that issue?
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Screen Making / Re: Screen Room LED's
« Last post by Admiral on Yesterday at 02:01:44 PM »
We also use high bay LEDs.  They do expose screens, I forget how long it takes but I believe when I did the quarter test with it they were pretty well exposed in 15 minutes with the LED closer than normal (6-8' away). 

I started with UV blocking amber film.  Worked great for 2-3 years.  Turns out the LED burned through the amber film where it was strongest and turned the film clear and stopped working.  Our screens were exposing, mainly the ones on top of racks.  I then bought 1/8" thick acrylic amber UV blocking sheets and lasered out circles along with holes for bolts to go through and connect with a standoff to the high bay LED lights.  Has worked perfect for 5+ years and the darkroom isn't too dark at all.

I did also tint the window across one of the doors to the darkroom (huge 5'x8' window) and the small window on the swinging door there.  That UV was definitely exposing screens at first lol.

UV Process Supply is where I got that UV blocking amber acrylic but they seem to have gone out of business unfortunately.

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Equipment / Re: MSP3140 transformer
« Last post by ebscreen on Yesterday at 11:11:02 AM »
Does M&R provide schematics for their products? All my other machines came with them, and I would love one for our
Sprint dryer. I realized yesterday (after having this thing for 10 years) that there is a beefy 240/120 transformer that is powered on
24/7 (for the controls) that I would like to nix, it's just wasteful and will eventually die.
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Equipment / Re: MSP3140 transformer
« Last post by Zelko-4-EVA on June 24, 2026, 08:56:56 AM »
Quote from: repogolfer on June 23, 2026, 04:40:12 PM
Thanks for the replies.  I'll have to dig in there and see if the old one has anything on it.   

Do you think it will tell me voltage in/out and watts?   

Jon

maybe a schematic would tell you, or an M&R tech would tell you what the voltage plus AC/DC should be on each side of the transformer
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Equipment / Re: MSP3140 transformer
« Last post by repogolfer on June 23, 2026, 04:40:12 PM »
Thanks for the replies.  I'll have to dig in there and see if the old one has anything on it.   

Do you think it will tell me voltage in/out and watts?   

Jon

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Equipment / Re: MSP3140 transformer
« Last post by ebscreen on June 23, 2026, 11:26:50 AM »
Quote from: mk162 on June 23, 2026, 09:29:03 AM
Can you pull the old one and find the numbers on it?  It's probably half the price elsewhere.

They obscure/remove markings.

If you know the voltages in/out and watts you can easily find a replacement.

Not sure what it is about the MSP3140, but those things eat what are otherwise considered least likely to die components in
the electronics world, IE transformers and chokes. I vaguely recall someone adding more cooling fans to the controls box which
probably isn't a bad idear.
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Screen Making / Re: Screen Room LED's
« Last post by GraphicDisorder on June 23, 2026, 11:26:22 AM »
Quote from: ebscreen on June 23, 2026, 11:09:16 AM
Got it, appreciate the input.  We have a bunch of huge skylights, it's like being outside in here, so we have to have a dark room, plus we would
need like a million cabinets to store screens so we had to build this one out. It's the long term storage/exposure that gets me, can be such
a hard thing to pinpoint, IE "maybe we could have gotten a little more detail out of that one". I guess I could image a high mesh screen and leave
it sitting for a couple weeks for testing.

Ya with sky lights you probably need to do it. Here we've left screens certainly for hours out, not normal thing but its happened. Without any noticeable affect.
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Screen Making / Re: Screen Room LED's
« Last post by ebscreen on June 23, 2026, 11:09:16 AM »
Got it, appreciate the input.  We have a bunch of huge skylights, it's like being outside in here, so we have to have a dark room, plus we would
need like a million cabinets to store screens so we had to build this one out. It's the long term storage/exposure that gets me, can be such
a hard thing to pinpoint, IE "maybe we could have gotten a little more detail out of that one". I guess I could image a high mesh screen and leave
it sitting for a couple weeks for testing.
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Screen Making / Re: Screen Room LED's
« Last post by GraphicDisorder on June 23, 2026, 09:53:18 AM »
We have LED Lights in our entire shop, high bay out in warehouse/print area and also normal LED in our offices. We coat/image/burn in direct light, no dark room here. We did mention to the light people the type of work we did and he did make a choice on light color but not sure what it is to be honest.

I just know we never have screen issues and I didn't want to mess around with a darkroom, our building doesn't really have a great spot for that.
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Screen Making / Re: Screen Room LED's
« Last post by mk162 on June 23, 2026, 09:31:13 AM »
We run just cheap LED tubes and put clear UV sleeves on them. 
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