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Hi Esmond, I just checked every one of about 50 push button switch assemblies I have removed from 7000 series parts mules. I never noticed this before now, but every single one latches. The only

S61B and maybe another lead https://forum.allaboutcircuits.com/threads/analogue-scope-not-triggering.110430/ https://www.vintage-radio.net/forum/showthread.php?t=127483

Hi, I repaired several 2213, 2215 and 2235 scopes, and with all of them I added the fan. It's a simple 60x60mm 12VDC fan, and with most of the main PCB's the print already has place to put the one

Tek Folks, Mu 2215A has a fan-like exit port at the back. Does it have a fan? If not, does it need one? If so, I assume there are list threads about it. (I have not taken it out of the case to

Thanks but that the same D61A manual that's everywhere else. All the nice folks don't seem to be paying attention. <geoffreythomas@...> wrote:

https://elektrotanya.com/telequipment_s61_s61a.pdf/download.html Geoff.

Thanx Albert (and Michael ofcourse) for your perseverance. In the coming week I have a few days time to do new measurements and I report back. René

I can't find a manual for a Tele' S61 anywhere and the TekWiki download link provides a manual for the D61A. Any suggestions ? Liam

What you're doing, I think, is to shock excite the winding. Ideally, you'd use a unit impulse, but a short pulse may work just as well.? The frequency of the waveform simply allows the system to ring

I can't find a manual for a Tele

Hi Jared, I have just taken a look at the photos of the plug-in tester on Tekwiki and it looks rather like the BNC shell is connected to the ground simply by virtue of the fastening to the aluminium

Hi, No, once I confirmed by the ringing test it was bad, my guess would be the HV winding. I tried to take it apart to see if a (partial) rewind would be possible, but it was impregnated solid, so a

Leo, I see that you took the x-former in your pictures apart. Did you ever determine what the internal failure mode was? General comment. As Leo's pictures show, transformer failures can

Hmm, ok. Now I'm second guessing myself here. :D When I designed my unit, I had interpreted from the original manual that the BNC was connected across the HI and LO terminals, like the multimeter

How about other plugs like the 7D20 and its accessory units (DF1 or DF2, I think), or 7A16P. Maybe some of those button/switch parts are the same - or not. Ed

What is the normal operating frequency of that transformer? 1000 Hz test frequency seems to be on the rather low side. What is the frequency of the ringing that you're seeing? That's probably the

Hi, You could try a lower frequency, like 10Hz or so, with a longer 'On' time, to allow the ringing to dampen by itself. Now it could be stopped by the short 'on' time of the 1% of the 1kHz. Did you

Good catch Ozan. I've uploaded a revised photo. /g/TekScopes/photo/263498/3223503?p=Created,,,20,2,0,0

The ring test with a 10 volt 1000 Hz square wave with a duty cycle of 1% shows ringing on the primary winding of T460 - so that looks good! No ringing though, on the feedback winding on pins 3 and 6

(Again continued, wish I had a reset knob for myself.) I didn't trust my C420 measurement and repeated things. The new results were different. I won't report these or other results before I found out