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Bad tantalum, C3396, on the OUTPUT SIGNALS board. Replaced C3395 and C3396 and all is working again. Thanks, Barry - N4BUQ

Hi, I just picked up an OT502 E/O Converter TM500 Module in a mainframe of assorted modules, and am looking for a user/service manual for it. There doesn't seem to be much online.. If anyone has a

Thanks, Jean-Paul, Mark, and Tom, The relaxation oscillator I was referring to is the one that makes the neon flash which is comprised of R3019-C3019-DS3019. I was originally writing the above email

Barry, A few things that could cause the fast ticking are: one/both transistors from the 0067 IC to the driver transformer bad, the 9V zener to the 0067 open, the two 1mfd filters from the small

When there is an overload, the PS shuts down and tries again a bit later. Each tick is the sound made by the magnetics as current starts to flow then shuts off. No master oscillator drives the tick

Shorted tant J

I powered up one of my 7704As which worked fine the last time I used it several months ago. This time it worked for about 30 seconds and stopped with the power supply going into a rapid tick mode

I ground a slight taper on the top of the posts with a tapered Dremel grinding wheel. I vacuumed the cavity and then blew it out at low pressure with an air hose. I remember the HVPS it came out

There are dozens of Dremel tool accessories, and other manufacturers have made accessories which can be used with a Dremel tool. I own 25 grinding accessories for my Dremel tool, mostly aluminum oxide

I may.... or others may... have to remove the HV assembly... and hopefully put it back. If you get a chance... If it came out... why wouldn't it go back? How did you 'grind" the 'posts' ... with a

*Mouser and others sell adapter boards, or you can buy blanks on Ebay and add the header pins.* *Many mergers have caused new brand names on these parts.* [email protected]> wrote:

It's OK I've got this sorted now. I looked through another Tektronix programming manual for a different scope and it describes the OPC operation much better. It's all working fine now :)

Hi I'm currently trying to make some remote measurements (via USB) on a pair of repetitive waveforms using a Tek MSO4104. They occur about once a second and I want to measure the time interval between

I know this is an old discussion, but hopefully it is still active. I finally found the problem to be diode D940 in the high voltage power supply was open. I replaced it with a 2CL2FL diode and the

Forgot to mention that the output of the 1st mixer seems reasonable as far as I can tell. I saw three frequencies at the output of the first mixer: - -43 dBm @ 2.14178 GHz - -40.8 dBm @ 2.1579

After acquiring a TinySA Ultra which allows me to generate and analyze signals at higher frequencies than I've been able to, I decided to put my 7L13 back on the bench. To recap, with the 7L13 set

The vintageTEK museum has completed their 2025 calendar and is offering it for sale at the museum, on eBay, and on the Lulu bookstore. The museum is a 501C3 non-profit educational museum whose mission

I have a 1780R I want the Dallas chip(s) replaced with new chips like ones that can be done on a 2465B (fram/Ramtron/etc.). I do not have a reader or capacity to make the surface mount chip and board

Ed, I agree. I have been working on this SC502 for quite some time. This was the issue when I put It aside a year ago. Thanks for the comment.

I have the service manual and have restored 2 of these SC502s. I have everything I need to work on these except the experience. I appreciate the idea of a vertical amp issue as that was not obvious