Products > Test Equipment

TEKHIND 2235 (Tektronix India)

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tunk:
I think they are safety caps (X or Y) and should be replaced with the same type.

TERRA Operative:
Yeah, only replace with the appropriate X or Y rated caps!

Also, here's a video I made on restoring and upgrading my 2235. There are some mods to the PSU section to make it more reliable.
https://youtu.be/lrXCVg6T-ek

Also, you may find some of your problems are due to the corrosion eating away traces, I'd start by scraping back the soldermask to check, or at least do continuity tests on all the corroded traces to be sure that none are open circuit...

abhi1981:

--- Quote from: TERRA Operative on July 09, 2023, 01:26:12 pm ---Yeah, only replace with the appropriate X or Y rated caps!

Also, here's a video I made on restoring and upgrading my 2235. There are some mods to the PSU section to make it more reliable.
https://youtu.be/lrXCVg6T-ek

Also, you may find some of your problems are due to the corrosion eating away traces, I'd start by scraping back the soldermask to check, or at least do continuity tests on all the corroded traces to be sure that none are open circuit...

--- End quote ---

I was watching your video yesterday. Very good video.

The main problem in India is procuring the parts. You easily ordered all the parts from Digikey, but I cannot do so here. The postal system is very bad, packages from ebay etc. frequently get lost in transit. Only reliable service is Amazon, but not many electronic parts in stock.
I checked some local websites, but none of them have Y rated caps. X rated are available and at ridiculous prices.
Ceramic and mylar ones are easily available. Electrolytics are available, but not good brands such as Nichicon or Rubycon.

Regarding the corrosion, I'm also starting to think that the problem is not the caps but corrosion. There may be a loose connection somewhere, that is making intermittent contact. That's why the scope  suddenly powered on yesterday. I'll scrape the traces clean, resolder and then seal them with green UV mask.

abhi1981:

--- Quote from: floobydust on July 08, 2023, 06:14:32 pm ---Spreadsheet list of 2235 capacitors to replace when doing a recap:  https://www.eevblog.com/forum/repair/tektronix-an-usm-4882235-high-8-6-v-ripple/msg2539461/#msg2539461
At this age, I replace all electrolytics in the PSU to prevent drama.

--- End quote ---

Thanks. The spreadsheet was really helpful.

abhi1981:

--- Quote from: tunk on July 08, 2023, 06:17:09 pm ---Ian Scott Johnston recently looked at a 2215 where he replaced 3-4 of
the Rifa caps. Your scope looks similar, maybe it has more of those caps.
https://youtu.be/MW_p8HzVAlY
 

--- End quote ---

Watched the video. Very informative.

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