There seems to have been some questions about what this is for. This info first appeared in message #164397, in a different discussion. Here is a copy, replicated here, that describes its

I have just posted the schematic of the HV section of the HV engine, in the same pix folder as before. https://groups.io/g/TekScopes/photo/241896/0?p=Created,,,20,2,0,0 This is the HV fun part. The

Looking at the diagram, I realize that this point is the output to the BNC connector labeled B Gate. So, I believe it is correct to only have a signal at this point when Sweep B is used. Thanks.

I took the measurements at the test points suggested by Mr. Chuck. At test point 42 I only have the indicated waveform when using the Sweep B function. In Swep A I have no waveform. Should there be a

Hi, Steve.I think most, if not all, the people in this group understand that having a portable scope that connects to modern PCs and such is very handy, preferring though we may to use those glorious

Correction: it was not the Var Hold Off potmeter that was broken, but the B-Trigger potmeter, I wish it would have been the Var Hold Off, that one is easy to replace..... To be continued, Un

Hi all, I recently got a (very?) sick 2215A from the well known ePay site. It came to me perfectly packed from Germany (Thank you for that!) , and was as described and as it was shown in the

I also experience this failure-to-reset problem on my 7L5 (B09xxxx) when installed in the 7854 mainframe. However, the problem never appears when the 7L5 is installed in the 7603 or the R7603. And

The ch 2 lever moves but stays in dc mode. There is no detent snap but some drag going through gnd position. Am I correct assuming this is a loose grub screw?

Hi fiftythreebuick, Your thread is quite informative about the 555, and the great satisfaction to own and use it.. My single-beam 547 has an adjustment for trace rotation. in the dual-beam tube,

I'm not in my workshop now. Tomorrow, I will check the suggested test points. I am going to buy the U500 from an American seller that I once bought a 2465B, which I ended up selling to buy this 2467B

It sounds like a 502, which was my first Tek and I still have it stored away. It is a double beam with one timebase common to both beams. It's a little bit smaller than a 545. The vertical amps are

Not really. U500 is a pretty high failure item. I suggested the measurements around CHN5B, and CHN5A pins because they are the way it is driven for automatic tests. The transistor that drives

Generally, I go right from the AUTO voltage measurement failure to cleaning U500, to replacing U500.... but then, I have spare scopes that I keep to verify failed hybrids.. If you want to be doubly

Chuck, I'll take this and ask one more question: In addition to the U500, any other suspicious ICs that you can buy to take advantage of the shipment from the USA to Brazil? Thanks

Chuck. I will order this IC on Ebay then. Before ordering the CI, would you like me to do some other measure in the scope? I have another scope (hitachi) that I can use for this. Thanks for your

My next step after cleaning U500 is to replace it with a known working U500 from one of my test scopes. They are a very common failure part. -Chuck Harris Leandro Lindemann via Groups.Io wrote:

Hello Chuck. I removed the IC U500. I cleaned with Deoxit D5 its terminals and its socket. Unfortunately it didn't. Problem persist. Then I removed the IC PAL, cleaned his contacts and the problem

Yes. Leandro Lindemann via Groups.Io wrote:

I have now ended the resuscitation from 40 years hibernation of my 547 scope. I could not be more pleased with it. It has now inside an added little centrifugal blower fan that cools the HV supply.