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Shorted tant at collector, -12 bus? J

Greetings for Louisiana! I have an SC503 that has an issue with the -12V Power Supply. When I started troubleshooting the PS I came across a bad transistor, Q8052, plus several tantalums. At that

Hello everyone, I would like to tell you about the error. The oscilloscope can be switched on, the fan is running and the Key lighting stays on permanently. On the A11 DRAM Processor/Display Board

Mainly https://www.eevblog.com/forum/testgear/automating-tektronix-field-adjustment-software-for-tds-oscilloscopes/msg1388658/#msg1388658 more details about

I worked at Tek at the time, although not on the projects using the Tri-Star. The architect was Chuck Sax, who also created the "chuck's Pipe" - a CMOS bucket brigade chip that is the basis of the

Hello Jap, Thank you to take the time to respond to my request for information. My board is 670-9091-03 which does not match the component layout shown in the volume 2 manual on pdf page 187. It does

Hello Richard, I have the same 670-9091-01 board in my 2756P analyzer. Most of the information you are looking for is in the Service Manual 494P & 494AP Spectrum Analyzers Volume 2 - 070-5561-00. Pdf

It’s interesting that the specifications for WD40 contact cleaner state “Do not use on Keyboards.” I am assuming that they are referring to keyboards that use the elastomer type contacts where

During the early 11000-series days there were very few 11k plugins; so, we had to use 7k plugins. After cutting the bits from three or four plugins, you get past that trauma. Rather than carefully

Benjamin Badrakh has posted recently about his CAD model of the plugins, and I 3D printed his earlier version that looks just like the end on my 067-0587-10 (which IIRC is compatible with the

I have recently obtained a 494/AP unit and copies of the service manuals. However, the Log Amp board shown in my service manual vol 2 is not the same as the one fitted to my unit. Can anyone please

I don't own a 7CT1N but the 7A22 is a great plug-in, much more sensitive than the 11A33. I just have to get over the trauma of cutting it off the tail... :)

Thanks for the suggestions. Can you send me please the link you are talking about? It is strange that TkeCATS supports serial ports for the older 11300 and not for the newer DSA. Unfortunately my old

Thanks to everybody for answering.

I found very good (an much less expensive) the WD40 Contact. I use it extensively, so the price difference is not negligible. Its effect is exceptional on HP keyboards (like those of 8568B, 3325

Haha. Yes Jimbert He is still my friend I asked him first... He didn't really care too much about his scope! Not sure he even wants it back! Says it takes up too much space. John W.

I removed the defective U500 and cleaned it with Deoxit put it back in the scope and got the same error message. Then with great fear I removed the good U500 and put the U500 I suspected was bad

It was 4+ years last time I looked at it so take the following comments with a grain of salt. Some calibration data is stored in a directory "CalConst". I think those are the ones scope can figure out

Is he still your friend? ;-)

I will do the raw copy of the disk in the upcoming days, will update this topic for sure. I was under the impression that calibration coefficients are in nvram too on 8000 series. That explains at