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Trying to keep this on track: A TM5xx backplane is not a 7000 backplane. Raymond

Find a used TM501. Test and/or recap the power supply. Remove the cover to see properly what's going on inside and you're done! TM501 - TekWiki <http://w140.com/tekwiki/wiki/TM501> Christian

Does a cable extender with a separate power output header specifically for testing count?? Built into a dead plugin, the extender cable terminates into the card edge connector, while the power header

Bill, Thanks - I saw that link and am interested. I'll go back and find it. My thought was just for powering the plug-ins, but if you're going to do that, why not use the inputs/outputs also. Steve H

A few weeks back a fellow posted just such a device, intended to make 7K-series plug-ins outputs available for DSOs. I don't have a link, sorry Bill

Has anyone built a tester that would provide all the normal power to a 7000-series plug-in? Would it be worth doing? Maybe a way to do a quick "smoke" test of plug-in not known to be good. Outside of

Hi Max, That must be a relief! I think the protective function of Q32 is needed immediately after switching the scope to on, when the power supply lines come up (perhaps one after the other). Just a

Hi Albert, Found the culprit. The function of Q32 is not explained in the manual. Since you pointed toward Q32 and its "strange" function, just for curiosity I pulled it out. Result: the pulse output

I now have all the latest 4041 System Controller and 4041 DDU service manuals scans available. Photos of the front page of all three manuals are in the forum photos - just search for 4041 to find my

Did you find the 0.01uF X2 mains filter cap hidden underneath the mains input socket (on the main PCB)? You have to remove the socket to see it clearly and to replace the cap. Regards, John

Hi Albert, thanks for your new photo. I've added other two photos, which shows clearly that the signal at pin "E" it deads at +15V, and so the TD was killed also. Measuring the signal on two bases of

I got a few more requests for additional scope calibration items for Tek, so added them today, along with an unusual 4 channel analog/digital Tek 2216. I bet you haven't seen one of THOSE before... I

Hi Christian, Rollyn is absolutely right about the 2N3055. The original hometaxial process was switched to an epitaxial process. Unfortunately the side effects of this change were not considered

Looking for a Tek SC-501 scope part of the TM-500 system Thank you Jose Orgnero

Tom: Just for reference, you might show that I do have a copy of the Tektronix TS-4353/U Distortion Analyzer manual. I sold a dozen or so of these sets many years ago while owner of DiLette

Hi Max, For comparison I added a photo of the waveform at timing pin E to your album. Because of both the "+15V" effect and the temperature effect also Q32 might be suspect. As far as I can see Q32

It's been fifty years so I don't remember what current setting we used on the 575 to check the Hfe of the 0140's. This had to do with the HV osc in the 611 during B Phase in Plant 2 and Building 50.

Hi Max, At the more negative level Pin E resets the output to true zero in periods 3-6 and 9, by switching the pair Q86/Q88 such that Q86 conducts and Q88 is off. Pin E is the only Timer board output

I peaked into this HV circuit and its push-pull oscillator. It seems quite simple, primitive, It appears that before the negative HV appears there is plenty of current to the bases of the two

The timing board A1 rolled to revision -01 at s/n B080000, then to revision -02 at s/n B091450. R12 changed from 4.3K to 3K at s/n B091450. R26 changed from 15K to 13K at s/n B080000. R27 changed from