nashou
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Post by nashou on Mar 20, 2014 17:43:15 GMT -5
Ok they are 680uf 50 volts. I don't have any so RS will have to be the source tonight.
What is an acceptable ESR I had a few show 2 ohms seems high to me these were the Big caps 450 volt etc.
Some caps were added together in value , but they added up ok and ESR was under 1ohm
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Post by mastertech on Mar 20, 2014 18:32:20 GMT -5
Also depends on the value. Don't you have a chart?
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nashou
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Post by nashou on Mar 20, 2014 19:09:45 GMT -5
Also depends on the value. Don't you have a chart? No Chart. I usually go by data sheets to see what they are if they show ESR. Some caps you can't find data for. But most newer caps are under 1 or 2 ohms RS didn't have the caps I need so I'll order them and some fuses of all types just to have on hand. Maybe some other common value caps I don't have. Most caps I have are 35 volt or less and the ones higher are lower values. But i am feeling better about this repair so far having the info you gave me. Hopefully once I get the PS working with in spec no other boards are bad and the repairs to the YSUS were ok. Might order those SMPS regulators too incase if they are cheap. Nashou |
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nashou
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Post by nashou on Mar 20, 2014 23:37:00 GMT -5
found some diodes on the copper side that read short's and some others but I think it is because they are tied between legs of .3 ohm resistors. EDIT: I think i might have ZD8230 also tied to a .3 ohm resistor, its just above it to the left in the picture, so I think i'll have to remove those transistors before I am sure they are bad. Man i need schematics!!!  ZD8227,ZD8230, and D8055. These are covered with a clear coating that inhibits the markings from being read. I tried to scratch gently the coating and read the markings. the 2 ZD's had a D2 C marking and the larger Diode has a S4 SD. I assume the ZD's are 3.6 zenners www.onsemi.com/pub_link/Collateral/MMSZ5221BT1-D.PDFand the diode is a SD103AW www.s-manuals.com/pdf/datasheet/s/d/sd103aw%2C_sd103bw%2C_sd103cw_mcc.pdfI tried to get pics of the ZD's markings but they are barely legible but i spent a good half hour confirming that they do have a D2 on them. They are just about 2mm long. the Diode is just over 3mm    The parts are cheap so I'll order them unless you have something better. I had to order the caps from mouser and the fuses digikey has. I should have looked at Digikey for everything but I always use mouser first. I was going to get the fuses from RS but they are cheaper on line. So I'll add these diodes to the Digikey order as I found them after I made the other order. Nashou |
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nashou
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Post by nashou on Mar 21, 2014 11:23:16 GMT -5
ok, lessoned learned. On diodes that read short, double check by lifting one leg or side. But i learned a few case markings and what they mean in the process ! All those are ok. So I won't order any. Nashou |
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Post by mastertech on Mar 21, 2014 14:50:22 GMT -5
Now you know why all us techs hate working on plasmas.
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nashou
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Post by nashou on Mar 24, 2014 16:30:31 GMT -5
Ok parts in, fuse in . With jumpers on the three jumper points and no other boards connected I get the PS to stay on. All LED's stay lit even on the Alarm board. Should I connect the logic board and the SSB next and try a power on again? I think I'll try that now.
Nashou
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Post by mastertech on Mar 24, 2014 17:30:43 GMT -5
Do you have "ALL" or your supply output voltages?
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nashou
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Post by nashou on Mar 24, 2014 18:10:14 GMT -5
Do you have "ALL" or your supply output voltages? I am going to check them first. I think by having all the jumpers in place I am able to do that correct? Nashou |
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nashou
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Post by nashou on Mar 24, 2014 18:15:20 GMT -5
Ok I think they are all there, I checked every point and they look right.
Nashou
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Post by mastertech on Mar 24, 2014 18:48:02 GMT -5
Well it's kinda up to you now how you want to proceed. You can install and hook up everything and try it, or leave the buffer/scan boards disconnected and see if it stays on or any number of variables. I don't think there is a particular way to proceed other then keeping your fingers crossed, lol.
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nashou
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Post by nashou on Mar 24, 2014 18:50:31 GMT -5
Well it's kinda up to you now how you want to proceed. You can install and hook up everything and try it, or leave the buffer/scan boards disconnected and see if it stays on or any number of variables. I don't think there is a particular way to proceed other then keeping your fingers crossed, lol. Yep will do I forgot to check the 3.3 volt line to the Logic board will do that now. if it is there I am going for the Logic and SSB then the SUS boards connected to the Buffers. Wish me luck. nashou |
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nashou
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Post by nashou on Mar 24, 2014 19:21:55 GMT -5
close but no cigar. Plugged in with logic board then SBB and it stayed on. then realized I left jumpers in. unplugged it all. I heard a slight fain buzzing somewhere but could not detect where.
So I tried again with no jumpers. Did not stay on. So I figured it might be that I need other boards connected. so I plugged it all in except the SUS board I repaired. it all stayed on for about 45 seconds then shut down with 5
blinks of the red light. So I took all connections off and retested the voltages with jumper. All there. So I tried again, this time with all boards connected. stayed on about he same time then shut off again. 7 blinks as before. checked with jumpers error 13 on alarm board, checked the Fuse 8007
the 4 amp one...it is blown.
Nashou
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nashou
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Post by nashou on Mar 24, 2014 19:41:52 GMT -5
I looked at the doc you sent. On page 75 it says if resistor R8094 is 910k replace with 1M. I have a 910 K there now
I think i have a 1m SMD resistor. So I'll change that. I also put 4700uf caps where it should have 3300uf I don't think it make a differences I didn't have any 3300uf. those are on that same page.
Maybe I need to put in the right ones?
Nashou
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nashou
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Post by nashou on Mar 24, 2014 19:56:01 GMT -5
Ok I do have some 3300uf caps, I'll swap them out. But trying to find that 1M dmd is not something I want to do now. I have a bag full of SMD 1206 size but they are not marked. I would have to sort through them all.
Nashou
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