AR XA electronics question

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JohnnyIC
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AR XA electronics question

Post by JohnnyIC » 28 Sep 2017 11:00

I am busy refurbishing an AR XA and I'm pretty much done with the new plinth and Rega arm mod. The motor doesn't seem to be running as smoothly as it should, lot's of vibration which I am not sure is because I tested it unloaded or because of capacitors which need to be replaced.. It probably a good idea to replace the caps in any case. Now for my question; all the capacitors are rated 600vdc, is it really necessary for them to be that high voltage? My local electronics supplier doesn't stock these particular caps in such high voltage so I would have to order them online which I don't really want to do if I can use for instance 400vdc caps instead. Or can I just remove the whole lot and do a simple point to point circuit layout like ones I've seen online?
I'm in South Africa so it will be running off 230Volts/50Hz.
Here are some pics of my AR as well as the above mentioned capacitors:

https://s26.postimg.org/b2k0z9d0p/20170917_160416.jpg
https://s26.postimg.org/bj58lp0rt/20170927_064225.jpg
https://s26.postimg.org/mhgi3vpd5/20170927_064238.jpg
https://s26.postimg.org/3nup6vr55/20170927_064257.jpg

snfrosten
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Re: AR XA electronics question

Post by snfrosten » 29 Sep 2017 00:23

I would suspect the motor to be bad at this point since you ran it unloaded. Very rare the caps go bad, only seen a handful in the hundreds I've serviced or rebuilt.
I would try to keep the same values if possible, could eliminate the 110v caps if you want to simplify the electronics.

oztayls
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Re: AR XA electronics question

Post by oztayls » 17 Jul 2019 23:04

I came across this old mini-thread. From your pic, it looks like you have the Universal model.

The motors tend to go dry in storage and get noisy bearings. Aftr a drop of two of light machine oil and 30 mins of run time it will usually go quiet.

As for replacing the original caps, they are rated for DC but operating in an AC circuit so it’s important to make sure you use the same 600V rating if using DC caps. Otherwise, I would recommend replacing them with X2 safety rated caps for AC mains power applications.

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