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Old Tektronix 7603 Question

I may have done something stupid but I can't seem to find exactly what. I w as looking for some plugins better than what I got or at least another vert ical. Right now I have two 7B50s and a 7A18N. The N stands for Nothing, it is a 7A18 without the readout. No biggie, I know how to count divisions.

My bright idea was to use this thing as a component tester but still have i t easily switchable back to normal scope use. It is fast enough for most of my applications and is still bright and sharp, so why not ? It was not goi ng to be mobile - to say the least.....

So I got me down to BAMA and got the print for the mainframe, mainly becasu e I had to fix it. A couple of those forty year old filters had failed, how dare they ? I had the thing all up and running and was pleased. Then I dec ided on this component tester idea. I looked at the mainframe print and det ermined that I could indeed use a horizontal plugin as the second vertical in the right slot, just use the external input for the trace, and apply wha tever waveform to the DUT. So far so good and it was actually working. I ha dn't really finished, I was going to find an OPAMP or something to boost th e sensitivity a bit so I could use a lower amplitude applied signal and pos sibly a few other refinments as I got round to it.

However the other day I go to fire the old beast up and I have no sweep. Th e readout for the time/div is no longer at the top, it is more toward the c enter. The first thing that came to my mind was that I missed something and you actually cannot use the 7B50 in a vertical slot, but neither one of th em work now. Surely I didn't fry the both of them. So I figure maybe again, that I missed something and somehow wiped out one of the sources on the ma inframe but they all check good, at least out of the rectifier board.

I thought fairly sure that Tek stuff wasn't like a Sony TV and it unlikely a shorted plug in would fry the power supply or anything like that, though it is not impossible.

At this point, if the problem is in the 7B50s, obviously I caused it and sh ame on me. If the problem is on the mainframe then it is possible that it j ust happened. This is what I question becasue each scenario would put me in a slightly different mode in troubleshooting old Betsy here. I know the th ing isn't worth a fortune but I like it.

Between the plugins and the final horizontal amps does work because an exte rnal input will work, or at least when the selector is set to "line". In ti mebase mode the display is there, this tells me a few things that it is NOT .

Whaddya think ? Anyone around here ever have success using a horizontal plu gin for a vertical in a 76XX ? I am sure you can go the other way to get an X/Y display (I think), but is there some reason you can't do what I did ? I checked the prints paying attention to the plugs to the plugins. If anyon e cares to give them a second look they are on pages 146 of the 7603 PDF an d 105 of the 7B50 respectively. I can't seem to find anything that would in dicate that it was an ID ten T error. Nothing seems to point to that but I find it hard to beieve both 7B50s failed the same day for no reason. Still, when you put it in auto trigger it should be able to get a trace. It does not.

The main question here at this point is if there is simply a fault in the m ainframe or if I blew it. If it "just happened", well then I know what to d o. I think.....

Any ideas ?

Reply to
jurb6006
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The Yahoo tekscope group is quite active.

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Anyone wanting to run for any political office in the US should have to 
have a DD214, and a honorable discharge.
Reply to
Michael A. Terrell

How do I use it without becoming a member ? I don't Yahoo.

Are there others ?

Reply to
jurb6006

What's the big deal? It's an online forum/Yahoo group. You can either have all messages sent to your email inbox, or read the group online. Subscribe, like you so to this newsgroup. Tell them why you want to join, then set your preferences. Give an email address they can contact you at. They wait till you are accepted. It took about 90 minutes for me to be approved. I have a 9603 to repair, but I haven't started on it, and the last one I worked on was 30 years ago so I won't try to give advice till I've been back in one.

None that I've seen that are worthwhile. They are either dead, or every message is moderated, so you wait from most of a day to a week+ for your message to appear. As long as you behave on the group, your messages go out right away. If you make an ass of yourself, you will be dropped from the group by the list owners. They have a wealth of service data, searchable archives and people who repair old Tek gear for a living.

--
Anyone wanting to run for any political office in the US should have to 
have a DD214, and a honorable discharge.
Reply to
Michael A. Terrell

suck it up and register.

I don't think swapping plugins will bust anything. But now, I'm afraid to try it for you. Don't break it if it ain't broke ;-)

Reply to
mike

So there are no answers here and no other options. OK I guess I will have to do it myself again. I asked here. I do not Yahoo.

If I have a question about a washing machine, calling card, watch or bootlegging XP I'll stop on by. Oh, or a 475. There seem to be answers for those.

Either me or my scope must have leprosy or a peculiar odor or something. I wish someone would tell me. In fact maybe I don't.

Reply to
jurb6006

Did you hot plug the modules? If so, that might be your problem. Do not hot plug the modules.

You can operate a horizontal module in a vertical slot.

Reply to
tm

ot plug the modules.

Oh shit.

Actually that may not be it because it didn't fail when I did it. It's not like staggered pins, you know like the AGP graphics cards, but I can see ho w a current spike could do it. Another thing occurs to me, if it is operate d with no modules at all, shouldn't it display a dot in pretty much the cen ter of the screen ? It does not.

Thanks for the response. It's something I might be able to go on. Instead o f checking the PS for the supplies I guess I am going to have to check righ t at the modules, or plugins. I don't suppose Ratshack is going to have the extenders eh ?

Having the prints I should be able to find test points in the 7B50(s) thoug h. I might have to stick a lead on somewhere and then plug it in and fire i t up, but I should be able to test it one way or another. It looks like the re are only five sources going in. I'll do that soon and get back.

Thanks.

Reply to
jurb6006

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Reply to
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