The NEW Build Your Own Arcade Controls
Main => Monitor/Video Forum => Topic started by: kyle__ on June 24, 2020, 12:13:04 am
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I'm trying to use a somewhat generic universal chassis labeled, "H-12" on the board, and "EPSP648" in some places in the listing I bought it on. I can't find much information about it. The tube I'm using is labeled WG 1220872. It came to me in an otherwise empty cabinet. No boards/chassis etc, but was told it worked.
Anyway, I can't find docs on this exact board, but from reading various sources, I thought I had things hooked up right. However, whenever I power it on, it pops the circuit. I am not using an isolating transformer but thought I read newer chassis didn't need that.
When I measure the windings, I get 2.3 and 5.6 ohms.
If there are other pictures or measurements needed, I'd be happy to provide.
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It didn't like so many pictures in one post.
Neck board. The other two pictures I took probably aren't that useful (model label on the tube & screen printing of the board name on the chassis).
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are you running the chassis from a iso transformer?
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are you running the chassis from a iso transformer?
I am not using an isolating transformer but thought I read newer chassis didn't need that.
Scott
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That chassis REQUIRES operation from an isolation transformer.
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Oh. OK. So, is that something you can tell from looking at it, or the model? How does one figure that out?
Edit, also ordered this from Jameco: https://www.jameco.com/z/ITR300-Power-Transformer-Isolation-120VAC-120VAC-300VA_181315.html
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I can tell by looking at the chassis. There would have been a large yellow transformer in the power supply section. That would have been part of a switching regulator power supply. Since it didn't have that transformer, this is a chassis that needs an isolation transformer.
By the way the transformer you ordered is a bit overkill for the common monitors. Here is what most games requiring isolation use:
http://www.arcadeshop.com/i/1346/monitor-isolation-transformer.htm
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So .... if I plug in the chassis to the isolation transformer, and plug it in, it blows the fuse on the transformer. Did my plugging this in without an iso transofrmer kill it; is it a lemon of a board; or do I just have it hooked up backassward?
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check the diodes in the bridge circuit and the regulator
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I tested all the diodes I could identify. They seem fine.
I don't know if it's related to what's happening, but what are these circled in white here?
The short wires jumpered to one of two pins.
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Well, I decided to try yet another new chassis, and it lives!
So either my naive rough handling killed that first chassis, or it was a lemon. As a bonus, this one had a degaussing coil and one page (duplexed) of documentation. It's not perfect, but it works enough for my proposes.
Before I bundle this into the cabinet again, what is this E pin for?
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crt earth, its the single wire that comes from the dag earth that surrounds the back of the crt( the metal braid)
absolutely critical