EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: C-47 on February 19, 2024, 07:57:02 am
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On inspecting a newly acquired above power supply, the input line capacitors indicate a need to be changed, the 100n X2 Rifa no problem with a replacement, but the 2 smaller 1n0 are Y2 rated, are not easy to find, any problems seen in replacing these with X2 rated items. Thanks for any input, Alan.
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https://www.allaboutcircuits.com/technical-articles/safety-capacitor-class-x-and-class-y-capacitors/ (https://www.allaboutcircuits.com/technical-articles/safety-capacitor-class-x-and-class-y-capacitors/)
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Hi
Legally you must NOT replace Y capacitors with X ones as doing so would introduce a serious Heath and Safety issue, Y capacitors MUST fail open circuit whereas X ones do not have to do so.
G Edmonds
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RIFAs are particularly resistant to surge events so do have at least one redeeming feature :-DD, and they are still available new. If the replacement lasts as long as the original RIFA then I wont complain too much. However, if you are not replacing like for like then you cannot swap a Y2 cap for an X2 (though some caps are rated for both X and Y usage). You can use a Y1 in place of your existing Y2 cap (but not necessarily the other way around).
When I did this job on a e3631A (and some of it's older relatives), I mostly went with RIFAs again, except where the output was also filtered by RIFAs (HP 6623A), which I replaced with a mix of RIFAs and polypropylene.
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Thanks to all for the input and link, most useful, now the search begins for the correct capacitors, where they don't charge $30 shipping on a $3 item. Thanks
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Convoluted Travel Route:
Ordered the correct capacitors from Mouser as they had reasonable shipping cost, but the route they took to reach Australia makes one wonder about "going green". Items departed Dallas - Louisville - Dubai - Shenzhen - Singapore - Perth, don't even want to think of the carbon footprint for moving a couple of grams. Plenty of direct flights from the USA to Oz, other than that, service and tracking all good.