Re: 7000 series on screen graphics question 7704A versus 7633
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Rob,
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I couldn't work out by looking at the screen yesterday whether the problem was on both vertical and horizontal signals from the readout board, or just the vertical or just the horizontal. The only other readout boards I had to hand didn't appear to work at all - both untested early boards from 7633s that were scrapped (faulty HT xformers) - I don't think this should make any difference. There wasn't time to start any serious component swapping - I should have swapped out U2284 which is the Format Generator chip, but didn't think to do that until too late. I tried changing Q2530 on the vertical board, but that didn't fix it, I should probably have changed Q2430 as well but ran out of time. It might be the U510 horizontal channel switch that's causing all the problems but I didn't have time to swap that out either. Certainly the problem was not focus or astigmatism. Dave -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Rob Sent: 21 July 2012 16:03 To: TekScopes@... Subject: RE: [TekScopes] Re: 7000 series on screen graphics question 7704A versus 7633 What the possibility of those guys in Somerset letting you swap the board to make sure that will fix the problem and then you give it back to them?.... Obviously I have nothing to base it on but I am not convinced that the problem is in the board. I suppose if you can get a board cheap enough it doesn't matter but before I laid out serious money (whatever that means) I would want to be as sure as I could that this path would fix the issue. Please don't read this as saying that swapping the board is not good advice. I think it is/could be. However, I would just want to be as sure as I could before I laid out $$. Anyway, not meant to offend just brainstorming. Rob -----Original Message----- From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Chris Wilson Sent: Saturday, July 21, 2012 9:29 AM To: david Subject: Re: [TekScopes] Re: 7000 series on screen graphics question 7704A versus 7633
IIRC, the character generator has 2 sets of adjustments, some on the You will need the serial numbers as there are serveral different... dc Thanks for that, looks like the easiest way forward is to swap out the board (se my wanted post for details). David partridge thinks I can use any known good board in any 7633 scope and they should work, have you ever had cause to swap early for late etcetera? My scope came from a dealers in Somerset, I think they had three of them, certainly two anyway. Apart from the character display it's been fine, and I wasn't even aware it was not as it should be until I saw some photos of similar scopes showing a display. I can live with it as it is, but would like to sort it as it kind of bugs me now :) Thanks dc 21/07/2012 15:25 -- Best Regards, Chris Wilson. ------------------------------------ Yahoo! Groups Links ------------------------------------ Yahoo! Groups Links |
David C. Partridge