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Post by mastertech on Sept 14, 2018 12:22:00 GMT -5
Just put some card board or plastic under the ballast if you lay it on top of another board. I would like to know if that spark gap is flickering. You seem to have all the voltages. Those opto couplers are nothing more the a photo switch. The isolated side can be jumped for testing but before we get into that I would like you to check that spark gap.
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Post by mastertech on Sept 14, 2018 12:59:05 GMT -5
Test that R6 resistor on that ballast board also. Those carbon resistors can go open sometimes.
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Post by stridsvognen on Sept 14, 2018 13:40:36 GMT -5
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Post by barclay66 on Sept 15, 2018 4:44:29 GMT -5
Would like to have it working for the meet in Oktober, at least just to use it as a geometry reference for the CRT setup, wich is pretty much what it do best. Hi,
I have a FullHD Projector (Benq MH740) that I could bring with me if needed. It too is good for geometry reference (and that's about it... ;-)
Kind Regards, barclay66
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Post by stridsvognen on Sept 15, 2018 15:36:34 GMT -5
Thanks,no need i have a Benq DLP old one that i can use to, lets hope it turns on lol
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Post by stridsvognen on Sept 16, 2018 9:58:08 GMT -5
Ok..... Ready for 2nd round.. Balaster out and conected.  |
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Post by stridsvognen on Sept 16, 2018 15:37:51 GMT -5
Test that R6 resistor on that ballast board also. Those carbon resistors can go open sometimes. I tested that R6 the other day, was around 5 ohm if i recall right, there is no sparks or anything, its dark now so i turned of the light, noticed nothing. The ballaster is now ready to be fiddeled with while powering everything on. |
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Post by mastertech on Sept 17, 2018 17:32:00 GMT -5
I have a couple ballasts here somewhere so give me some time to find them and I can get you some readings from certain components. I am just a little busy right now and extra time is not available.
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Post by stridsvognen on Sept 21, 2018 5:33:39 GMT -5
I have a desire to replace all 3 optoisolators, anyone who can help find a compatable replacement to the obsolete NEC ones.?
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Post by mastertech on Sept 21, 2018 9:21:15 GMT -5
Sorry. Been real busy. Who do you get your parts through and I will cross to what they have?
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Post by stridsvognen on Sept 21, 2018 9:35:55 GMT -5
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Post by mastertech on Sept 21, 2018 9:52:54 GMT -5
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Post by stridsvognen on Sept 21, 2018 10:35:01 GMT -5
would it be a idea to get a new spark gap thing, and how to know the type of that one.?
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Post by mastertech on Sept 21, 2018 10:55:50 GMT -5
Well that is hard to say. Usually they are just used for high voltage or static discharge but I do not know if it serves another purpose in this application. So you can change it if you wish or wait and see if the opto couplers fix it or not.
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Post by crtbilly on Nov 7, 2018 12:52:52 GMT -5
Any update on your progress? I am trying to troubleshoot a ballast from a rs45. I think they are similar. My ballast is a rubycon RPB-0526GA. It looks like a few diodes got a little crispy on the back of the board. Will try and take some photos.
Would really like to get it working.Info is scarce. Like to compare it to my g90.
Thanks!
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