 Posted: Wed May 06, 2026 1:26 pm Post subject: Service manual |
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| I posted the serviced manual on elektrotanya.com | |
| Posted: Sat May 28, 2011 5:04 am Post subject: |
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| Hi Demonstar, I would like to know if you could repair your oscilloscope, I have one vp-5220A 20MHz. It's not working properly but I hope it can help. | |
| Posted: Tue Oct 07, 2008 3:07 pm Post subject: |
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| Thank you very much! It is much appreciated! | |
| Posted: Tue Oct 07, 2008 9:07 am Post subject: |
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Will do a comparison on circuitry and give you some details to go through from the pictures I have seen. I have a "Scopex 4D 25" and hope to get some details from it on comparison, for it works fine to date. This is possible by weekend pse. |
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| Posted: Mon Oct 06, 2008 3:22 pm Post subject: |
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| Here's the link to the photos (REMOVE ALL NUMBERS FROM THE URL. DON't LEAVE ANY WHAT SO EVER! It's the only way for me as a guest to post a web address. I can't link it because it keeps saying something about spam.) Sorry for the inconvenience!
w54254w3w.fx434grimoire43524524.w5845ebs.co43m/app43243s/phot54os/ |
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| Posted: Mon Oct 06, 2008 3:17 pm Post subject: |
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| I've uploaded some images. I'm really sorry for the poor quality. Click on the full size button to see a bigger image. I can take any more images needed but these should give an over view and get us started. The camera doesn't have a close-up mode so I had to take them where it would focus. They are 10 megapixels though so zooming shouldn't be an issue. If you download them and zoom you should be able to pick out detail. Downloading them as opposed to keep viewing them over and over online will also mean they don't get taken offline due to exceeding the maximum monthly bandwidth I'm allowed. Thanks much appreciated.
I'm going out to keep trying to fix the thing. |
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| Posted: Mon Oct 06, 2008 5:46 am Post subject: |
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| Yes close up pictures of the board components would help, and even of crt base would help. thats cause we have no manual at all.
if 5 pins crt the heaters are 1 and 5, but dont try power on this unless proved. for 8 pins its 4and 5. but thats an old idea we had dont use unless proven correct. |
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| Posted: Sun Oct 05, 2008 10:28 pm Post subject: |
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| Would pictures help? I could try and get some if they would. | |
| Posted: Sun Oct 05, 2008 10:27 pm Post subject: |
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| Thanks Cogil!
I don't have glow on the CRT at the moment. I know very little about circuits involving CRTs so I couldn't follow all of your last post. How do I know what the pinout of the CRT is? eg how do I tell which are the heater pins? I have only tested for the 12Volt supply on the power supply board and the main board. They are the only voltages I have tested for. Because of what I mentioned earlier I am expecting to find a fault on the vertical preamp board. I have yet to start looking there. I guess I need to find out whats going on with the heaters first. I just don't know what the jobs off all the wires going to the CRT are. I guess if I know which pins the heater is I can apply the correct voltage to them to test it to see if it glows then hunt for why the power isn't getting to it if it's still O.K. I didn't know what you meant by a line output transformer so I searched and I think you might be referring to a flyback transformer??? I know there is a mains transformer but in the HV section there is a little silver box about 1 inch long by one inch wide and half an inch deep. I think that could be what you mean. I'm really sorry for my lack of knowledge, I really appreciate your help! Thank you! I will get there in the end and will have learnt a lot along the way. Even if it never works, I have learnt a lot. but hey... It will work!!!  |
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| Posted: Sun Oct 05, 2008 7:29 pm Post subject: |
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| sorry the third or so line should read;
If the supply is on and the filaments not lighting |
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