Need help on identifying a mystery Korean oscilloscope

[sakhmatd]

Hello!

I've been looking around for an analog companion to my Rigol DS1052E and managed to score this little guy from EBay.



The seller said that he doesn't know the brand or anything else other than it's made in Korea.
The design and knobs look suspiciously like the (in)famous Hung Chang OS-620, but this one has multiple triggering options and a different layout.

I don't have the scope on me yet, but I was wondering if somebody could help me identify this puppy based on pictures. If not, I'll crack it open when I get it to try and gather more info.

Here are some more pictures.

Thanks a bunch!

[Jwalling]

Got to wonder why a manufacturer wouldn't put their name on it! 
Any idea if it supposedly works?

Jay

[sakhmatd]

Got to wonder why a manufacturer wouldn't put their name on it! 
Any idea if it supposedly works?

Judging by this picture, I am inclined to say that it does indeed work, which is why I bought it. It looks like it had a manufacturer plaque on top of the screen there but then something happened to it maybe?

[alsetalokin4017]

Meguro MO-1252, Japanese not Korean



http://www.radiomuseum.org/r/meguro_mo_1252.html

Also appears to have been sold by Elenco Electronics.

[tautech]

Ha funny, there's a repair thread on one of these at the moment:
https://www.eevblog.com/forum/repair/old-meguro-mo-1251-scope/

[sakhmatd]

Meguro MO-1252, Japanese not Korean

Also appears to have been sold by Elenco Electronics.

The back of the scope says it's Korean. Judging by the colors it is indeed an Elenco MO-1252.
Thanks!

[sakhmatd]

Ha funny, there's a repair thread on one of these at the moment:
https://www.eevblog.com/forum/repair/old-meguro-mo-1251-scope/

Heh, funny indeed. Hopefully mine arrives safely.

[tautech]

Ha funny, there's a repair thread on one of these at the moment:
https://www.eevblog.com/forum/repair/old-meguro-mo-1251-scope/

Heh, funny indeed. Hopefully mine arrives safely.

If you inspect that thread you'll find the OP listed the wrong model in the thread title, corrected the title and provided a link for the full manual for MO-1252.That may of use to you. 

[CustomEngineerer]

Judging by this picture, I am inclined to say that it does indeed work, which is why I bought it. It looks like it had a manufacturer plaque on top of the screen there but then something happened to it maybe?

I could be wrong, but it looks like in the picture channel B is set to its max vertical sensitivity (at least down in the mv range), hooked to the 5Vp-p cal signal, but showing less than a full div high. Also, unless its just the way the picture was taken, the horizontal seems to be off as well, or at least horribly out of focus (signal focus/intensity, not camera focus).

[sakhmatd]

If you inspect that thread you'll find the OP listed the wrong model in the thread title, corrected the title and provided a link for the full manual for MO-1252.That may of use to you. 

I actually found the manual on my own after I got the reply here, but I did inspect the thread, might be of use.
Got the scope for only $60 shipping included, so if it works all well then that was a deal.

Was outbid on a perfectly good Hitachi V-212 by a flimsy sniper-placed dollar at the same price. 

I could be wrong, but it looks like in the picture channel B is set to its max vertical sensitivity (at least down in the mv range), hooked to the 5Vp-p cal signal, but showing less than a full div high. Also, unless its just the way the picture was taken, the horizontal seems to be off as well, or at least horribly out of focus (signal focus/intensity, not camera focus).

I'll report again when I actually get the scope and get to play around with it, hasn't been shipped yet and will probably take about a week after it does ship.
 
I attached a few more pictures with the trace on them though. What's the most likely thing that can go wrong with it?

[sakhmatd]

Just an update, I apologize for the double-post.

Got the scope today, works pretty damn well. The calibration point is 0.5V p-p, the person who took the picture most likely had no idea what they were doing.

Thanks for all the help.

[CustomEngineerer]

Glad to hear that it is working well. Hope I didn't cause you any extra worry. Enjoy your new tool!

[David Hess]

The triggering is a little

The design and knobs look suspiciously like the (in)famous Hung Chang OS-620, but this one has multiple triggering options and a different layout.

They do look related.

What is really different between them is the delayed sweep feature.  The OS-620 has a single timebase while your mystery oscilloscope has a single timebase delayed sweep which is pretty unusual; it is sort of midway between having a single timebase and having a dual timebase delayed sweep.

[sakhmatd]

Glad to hear that it is working well. Hope I didn't cause you any extra worry.

Nah, I figure if it has a trace on it, then I could at least calibrate it and/or replace parts.
Thanks.

They do look related.

I wonder if there are fifty million clones of this thing floating as well. The manual provides a full non-proprietary part list and even board templates for you to etch out.