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Post by jaredjaric on Nov 5, 2015 13:09:51 GMT -5
I would be testing all voltages coming into the EHT board. Just be careful. I do not have the high voltage probe or tester, so can not be going that route. But i can say that all parts were tested in a spare 909 Pj from Curt. Am sure it was tested first. basically the cinemax would be fine if i use it for many hours adjusting and calibrating , straight for many days. But the quads or other HV part would conk out once i watch a video. |
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Post by jaredjaric on Nov 5, 2015 13:18:08 GMT -5
I would try this, seems easy to do.
My worry now is more on failing quads than eht boards.
I understand that this test affects the eht circuit more than the actual quad.
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Post by mastertech on Nov 5, 2015 13:23:05 GMT -5
I would be testing all voltages coming into the EHT board. Just be careful. I do not have the high voltage probe or tester, so can not be going that route. But i can say that all parts were tested in a spare 909 Pj from Curt. Am sure it was tested first. basically the cinemax would be fine if i use it for many hours adjusting and calibrating , straight for many days. But the quads or other HV part would conk out once i watch a video. This has nothing to do with measuring high voltage. It has to do with any over voltages that may be sent to the EHT which could then affect the quad and/or splitter also. There are no high voltages on the EHT. Unless you consider the 300V high, which is really not and any DMM can measure that voltage. Just don't stick you finger (or tongue) in there. Probe only.  |
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Post by mastertech on Nov 5, 2015 13:25:58 GMT -5
I would try this, seems easy to do. My worry now is more on failing quads than eht boards. I understand that this test affects the eht circuit more than the actual quad. The quad will only fail for 2 reasons. To much voltage being sent to it or the quad was going bad to begin with. Well maybe something with the focus circuit but that is a little reaching. |
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Post by mastertech on Nov 5, 2015 13:30:22 GMT -5
My worry now is more on failing quads than eht boards. I understand that this test affects the eht circuit more than the actual quad. Let me also clarify this. These tests have almost nothing to do with testing the actual EHT. Or even the quad or splitter for that matter. These tests are to see if to much voltage is being sent to these components and causing the failures. These voltages do not come from any of these boards. They come from some where else. |
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Post by jaredjaric on Nov 5, 2015 13:30:47 GMT -5
I would try this, seems easy to do. My worry now is more on failing quads than eht boards. I understand that this test affects the eht circuit more than the actual quad. The quad will only fail for 2 reasons. To much voltage being sent to it or the quad was going bad to begin with. Well maybe something with the focus circuit but that is a little reaching. I will report right back about the test, |
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Post by mastertech on Nov 5, 2015 13:33:18 GMT -5
The quad will only fail for 2 reasons. To much voltage being sent to it or the quad was going bad to begin with. Well maybe something with the focus circuit but that is a little reaching. I will report right back about the test, Just don't test on the quad itself. Test on the EHT only. |
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Post by jaredjaric on Nov 5, 2015 13:33:42 GMT -5
I would try this, seems easy to do. My worry now is more on failing quads than eht boards. I understand that this test affects the eht circuit more than the actual quad. The quad will only fail for 2 reasons. To much voltage being sent to it or the quad was going bad to begin with. Well maybe something with the focus circuit but that is a little reaching. I will report right back about the test, |
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Post by jaredjaric on Nov 5, 2015 13:36:19 GMT -5
I will report right back about the test, Just don't test on the quad itself. Test on the EHT only. yup, saw it done by a tech friend on another pj many years ago. it is very lethal. |
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Post by Casethecorvetteman on Nov 5, 2015 17:32:21 GMT -5
Were these all new parts and where did you obtain them? yes all parts and quads look clean, Most of it from Curt ,the last quad was from a 909 unit i just got from Curt. Quads had no bumps and no fine cracks, Im not going too far into this, but i have had very high failure rate on Barco HV parts from there. 100% failure rate infact. Zero failures from Greg Eisemann, and "new" really does mean what you think. |
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Post by Casethecorvetteman on Nov 5, 2015 17:36:21 GMT -5
Stop buying used parts will be my first suggestion...
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Post by jaredjaric on Nov 5, 2015 19:36:31 GMT -5
Stop buying used parts will be my first suggestion... I will try to get a quote from Greg, but would have to figure out what is frying my hv section , esp quads. |
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Post by Casethecorvetteman on Nov 5, 2015 19:49:27 GMT -5
Stop buying used parts will be my first suggestion... I will try to get a quote from Greg, but would have to figure out what is frying my hv section , esp quads. Could be anything, but get onto Greg. |
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Post by jaredjaric on Nov 5, 2015 20:32:24 GMT -5
Just measured the test point m102, 224 + volts dc , w/ or w/out the eht and quads on the pj. I tested my working 909 pj, it also measures the same 224 volts dc. I would be testing all voltages coming into the EHT board. Just be careful. To my understanding that is the voltage that comes direct from the PFC. There is a measuring point on the PFC. I once measured there to see if I had the right voltage something like 380V dc if I remember well. The PFC has a current sense that adjusts this voltage. There could be a problem there. You need to measure M102. But it is next to grnd measure point. I would suggest soldering a wire.  |
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Post by mastertech on Nov 5, 2015 20:46:48 GMT -5
I guess you want fox to help you so have fun.
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