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Post by Casethecorvetteman on Feb 24, 2016 21:03:37 GMT -5
I have another splitter here that is apparently faulty in that it affects the focus, i might try fitting that one to see if it all still arcs.  Is there anything else i should also do as a precaution? |
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Post by dummyload on Feb 25, 2016 3:44:38 GMT -5
I would not try with a faulty one ,risk of damage to quad (affecting focus = wrong level of hv)
Look for another one or try the suggestion from greg and put your two arcing splitters in the oven around 50 degree celsius (low enough not to deform anything) for a few hours and try again ,
of course you already can have carbon traces from the arcing happened ,so first clean them good with alcohol and then look that there are no black traces are residu nowhere ,remove with dremel if necessary.(use a magnifying glas to look) Not much else you can do.
Over 15years I encountered 5 splitter failures and only 1 quad ,al in different barco projectors ,so I fear the splitter the most .
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Post by Casethecorvetteman on Feb 25, 2016 4:06:02 GMT -5
My theory is there that i wont be blowing another good splitter if i briefly test the faulty one. I only need it to run for 10 seconds at most. I left a bunch of splitters out in the Australian sun for a few hours today, sitting on the roof of one of my cars. They were very arm when i bought them in. I left the air conditioning on at home to keep everything inside dry as possible. Ill try another splitter when i get home from work, will just hook up splitter and green tube. Thanks for your help so far  |
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Post by dummyload on Feb 25, 2016 4:34:18 GMT -5
Oh I forgot you live in an oven ,(just kidding)
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Post by km987654 on Feb 25, 2016 6:30:34 GMT -5
Are all the earth straps connected so that the tube bell is earthed?
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Post by dummyload on Feb 25, 2016 6:55:03 GMT -5
km987654, that will normally give arcing somewhere on the tube not on the splitter .
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Post by Casethecorvetteman on Feb 25, 2016 7:50:53 GMT -5
Oh I forgot you live in an oven ,(just kidding) Haha!! Mate yeah its pretty warm at times  Especially with my work vest on a 10kgs of gear hanging off it! |
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Post by Casethecorvetteman on Feb 25, 2016 7:52:47 GMT -5
Are all the earth straps connected so that the tube bell is earthed? The red one was not on first start up, but it was the blue that arced from the tube to the focus yoke clamp. |
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Post by Casethecorvetteman on Feb 25, 2016 7:54:04 GMT -5
km987654 , that will normally give arcing somewhere on the tube not on the splitter . Yes it was all at the splitter apart from that one crack from the blue. |
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Post by km987654 on Feb 25, 2016 17:07:37 GMT -5
km987654 , that will normally give arcing somewhere on the tube not on the splitter . Yes I get that. You need to cover all the bases to eliminate a problem though. If you have been through a number of splitters it could be just bad luck or perhaps something else. Do you have a HT probe so you can measure HT or have you done that? |
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Post by Casethecorvetteman on Feb 26, 2016 3:43:35 GMT -5
You can measure HV on the feedback line, but no i havent done that either. Dont have a HV probe.
I will reinstall the two known working tubes again and try another couple splitters ive cleaned up with alcohol and have baking in the oven at 60°c and see what happens.
The working tubes have 22,700 hours on them, and id say that is why they dont focus as well as they should, even with the focus yokes as far toward the bell as i can get them, they are still set at around 40 on the mid point focus to get their best sharpness. Although there is almost zero wear on them, their output is not as bright as the 7,300 hour tubes that came with the set, and theyre not as sharp.
The 22,700 hour green was still in the set when i installed the low hour blue and 7,300 hour red.
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Post by Casethecorvetteman on Feb 26, 2016 7:34:04 GMT -5
Arcing issue is now fixed, but the image size is pulsing in and out. Id say this other spare splitter i had here is also dead.
The other side to it all is the focus is now back where it should be with this other splitter, yokes all the way forward before needed a midpoint setting of around 40 for best focus, where as it should be around 57 with the yokes back a bit. Id say the other splitter was also stuffed.
The other i have is the marked faulty one, not going to test it in this set. The other two have both been subject to serious arcing, and im reluctant to put them back in this set.
Has anyone ever seen the size pulsing before?
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Post by Casethecorvetteman on Feb 26, 2016 19:38:22 GMT -5
Ill add further, part installed are:
Splitter is 762718
Quad is 763368
Also have Quads 761743 and another model number.
What do you reckon there mate
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Post by dummyload on Feb 27, 2016 8:06:36 GMT -5
I would not try to measure the feedback line its high impedance ,so putting a meter (load) on it will change hv output ,and you probably at noise to it to ,and the 1/1000 resistor divider can be the problem ,so only measuring the hv output can give you valid level of the hv . Image pulsing in and out have had that to in a barco data600 =faulty splitter= hv goes up and down , I would like to know if its the c on output thats dying or the divier thats dying ,the divider is very simple but if you do the math you quickly find out that doing it with a low dissipation you get very high impedances . (347megohms dissipates 3,47wat at 34,7kv)
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Post by Casethecorvetteman on Feb 27, 2016 12:32:50 GMT -5
I think there is a listed procedure for it in a SEOS manual, GregSTV recently forwarded it to me, and i passed it on for upload here.
Either way im not overy interested in testing that side of it, but i would like to test and adjust the EHT board settings, ill have to grab a HV probe for my Brymen meter.
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Especially with my work vest on a 10kgs of gear hanging off it!
