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Just a hunch, didn't study the schematic much nor thought this through but low -12V (closer to 0V) would lead to Q32 conducting from ca. -7.5V (?), pulling down on R30 (point 10). Could this stop the

Against excessive positive (+15 V) supply I presume. If for any reason the positive suplly voltage is too high, the TD can be damaged by an excessive current. It is veeery small and must tolerate 50

Hi all, A recent topic (ending at message #168946) about S-52 repair brought up the mysterious role of Q32. During normal S-52 operation Q32 will never conduct . Anyone an idea? Some kind of

I will have a supply of ZD985 pump diaphragms in a few weeks. Please context me off list if interested. EJP

Hi Dick, The Operator's Manual of this TestSet is in the File Section of this Group. /g/TekScopes/files/SG505%20MOD%20WR%20WQ%20AA501A%20MOD%20WQ.pdf More interesting is the Service

Hi, I the guy who is making a standalone power and signal adapter board. The original post is here /g/TekScopes/topic/74053244#168481 To answer your question, would be it worth doing?

I'm going to find it a HOME! You can use it ??? Make me an offer I can't refuse! wrote:

Kim, I did see that reply. I'm going to do some additional reading about it. Yes, TEKWiki is a wonderful source. I do not know why I did not think to search for this item myself. I guess that I

I put 9090 ohm 1% and 22k ohm 5% resistors and now the circuit works perfectly. Thanks Albert for your valuable suggestions! Thanks also to Dan for exposing the latest changes to the schematic. I have

Hi Michael!! Have you looked on Tekwiki? Is this it? http://w140.com/tekwiki/wiki/067-0872-99 ( http://w140.com/tekwiki/wiki/067-0872-99 ) Another Member sent this to me.? Seems this is listed at

Have you looked on Tekwiki? Is this it? http://w140.com/tekwiki/wiki/067-0872-99

aid. It is a 067-0872-99 Logic Demo Aid. It has a Tektronix label on the side of it that has a Field Engineers name on it> I do not see this as "inappropriate". I am always anxious to learn about such

HI All! Hope this is not inappropriate!? I have a strange TM 500 plug in and I'm guessing that it's a sales aid or a training aid.? It is a 067-0872-99 Logic Demo Aid.? It has a Tektronix label on

That's what I was trying to avoid. With current 7000 mainframe prices, purchasing and modifying one especially for this purpose is an option as well. Raymond

After checking you're absolutely right. Learnt sth today! In addition, rewiring may be tedious as even power supplies are not the same. Hope I did not be mislead some fellows out there...

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