Electrolytic Capacitor Substitution Question

Oct 21, 2007 4 Replies

trying to repair RCA VR688HF VCR (because stand-alone VCRs apparently are not manufactured/sold anymore), have reviewed most of VCR repair FAQs, done most of things suggested there except replace components in power supply, VCR still has symptom of erratic behavior.



found 5 caps questionable in PS with power on, scrounged duplicates for 4, have not found a cap substitution FAQ. the



5th cap is 100mf/200v.

question: if i substitute a 560mf/200v for the questionable



100mf/200v, would this cause damage or just better filtering?

If this is a main filter capacitor, it will demand a much greater inrush current when the supply starts up. I would order the correct value. You could probably get away with a 150 to 220 mF cap.

With simple filtering circuits, in theory, the greater the cap value the better the filtering. Just remember that when the power supply starts up it has to bring the cap up to charge. A greater size cap will take greater current during the charge time.

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Jerry G.

found 5 caps questionable in PS with power on, scrounged duplicates for 4, have not found a cap substitution FAQ. the

5th cap is 100mf/200v.

question: if i substitute a 560mf/200v for the questionable

100mf/200v, would this cause damage or just better filtering?

It sounds like the bulk reservoir car. Using a cap nearly 6 times the original value could very likely blow fuses at turn-on for example.

You can't be trying very hard if you can't find a 100uF/200V btw. Maybe look for a 250V rating ?

Graham

p.s. please don't write mF btw - that means milli-farads.

Google is your friend dumbass.

[...]

And no one is yours, dickcheese. How sad is that?

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