General > General Technical Chat

Rifa capacitors again

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mawyatt:

--- Quote from: Vovk_Z on February 13, 2022, 04:35:42 am ---I have Tec 2465 bought from the USA. It was bought about 10 years ago. I have to say that it worked fine several years here in Ukraine, and only then later started to show noise on a screen, so I had to take it apart and have a look. X2 Rifa caps were all cracked in a power supply, so I had to replace them all. I can only guess how damaged they were when it arrived here.

--- End quote ---

Consider changing all the electrolytic caps in the power supply. These are noted to fail, we had a few that were leaking in our two 2465 scopes, and most of the removed caps were undervalued.

Best,

TerraHertz:

--- Quote from: TimFox on February 06, 2022, 05:43:17 pm ---Obviously, the stress on an individual capacitor is worse at 240 V than at 120 V.
In the actual experience of the members here, is this problem much more prevalent in 240 V countries?

--- End quote ---

Well how would anyone know? Individuals experience failure rates in either 120V or 240V countries where they live, so lacking any kind of statistical comparison study, who knows.

All I can say is that pretty much every time I import some bit of gear from USA, that has always run on 120V, and I switch it to 240V in Australia then power it on without first replacing all the RIFA mains caps, there will be a stinky explosion very soon.  And this still happens because sometimes they are hidden inside metal can mains EMI filters.

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