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Test Equipment Anonymous (TEA) group therapy thread

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m k:
So you opened it.

Was it a regular pot on top of not so regular something?

DC1MC:
I've bought an ANGENG SZ20 as a comfort purchase  :palm:, the level of TE drought is terrible, anyways someone around Mannheim with a reasonable calibrator who wants to do a quick check/characterization ?

Cheers,
DC1MC

For risk takers:
https://www.aliexpress.com/item/1005005201649970.html

TERRA Operative:
I figured out how to use standard C-size cells in the THS700 series scopes, and keep full backwards compatibility with a completely stock appearance.

https://www.eevblog.com/forum/testgear/tek-ths720a-portable-scope-teardowndiscussion/msg4775885/#msg4775885

I have also ordered a new screen from China (still trying to source some polarisers that won't turn it blue and yellow instead of black and white. Got a bunch of TDS210 and TDS220 scopes to repair too. Damn STN/FSTN LCD screens and their extra filter requirements!) so this scope isn't far of actually being useable.

And now a THS720P has popped up on Yahoo Auctions, so I'll have a punt at that one too, see if I can nab it for a not stupid price. :D

Flare:

--- Quote from: m k on March 26, 2023, 11:44:05 am ---So you opened it.

Was it a regular pot on top of not so regular something?

--- End quote ---
I originally opened the back in situ in the hope I could repair it in place, as I'm pretty sure that the technically correct way to remove it is to remove that PCB, desolder the entire Horizontal timing assembly and then remove it from that. In the end there was just enough tolerance to get it out leaving the rest in place.
I've attached a picture of the insides, as you can see the crack fully separated. The wiper assembly actuates the switch on the rear which is inside the same casing. Also attached is a picture showing that due to it being switched, it doesn't have a regular track, the latched area of the switch is solid metal instead of carbon, for negligible resistance (I assume this is normal for switched pots).
If anyone has the service manual it would be great, I've just gotten the operating manual from Iwatsu Europe which I think I'll upload to Electrotanya as it's too large to host here.

DC1MC:

--- Quote from: TERRA Operative on March 26, 2023, 12:18:01 pm ---I figured out how to use standard C-size cells in the THS700 series scopes, and keep full backwards compatibility with a completely stock appearance.

https://www.eevblog.com/forum/testgear/tek-ths720a-portable-scope-teardowndiscussion/msg4775885/#msg4775885

I have also ordered a new screen from China (still trying to source some polarisers that won't turn it blue and yellow instead of black and white. Got a bunch of TDS210 and TDS220 scopes to repair too. Damn STN/FSTN LCD screens and their extra filter requirements!) so this scope isn't far of actually being useable.

And now a THS720P has popped up on Yahoo Auctions, so I'll have a punt at that one too, see if I can nab it for a not stupid price. :D

--- End quote ---

THS710 can become a THS720 (I did this to mine), but not a THS720P, on the other side a THS710A/THS720A may be easily modified to become a THS720P. Nice trick with the C cells, I splurged 17EUR and got one "original" for mine.

 Cheers,
 DC1MC

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