Beomaster 4000 - Resistor from power switch to ground

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Jeffrey P Brooks Posted: Wed, Sep 15 2021 11:27 PM

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I am repairing a Beomaster 4000 and just replaced a power switch that I got from Beoparts.  I managed to break the lead to the 3.3 MOhm resistor that lives right by this power switch which is connected from the switch itself (which carries mains voltage) to ground.

I ordered a replacement, but i'm wondering if anyone knows just what the purpose of this is?  The plug isn't polarized, so i don't think it matters which pole on the switch you connect the resistor to, but what does it do?

Thanks!  Jeff

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Menahem Yachad replied on Thu, Sep 16 2021 6:59 PM

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IIRC, it's a snubber resistor, designed to shunt off the arc energy created, when breaking contact - ie switching OFF the machine. Those arcs, if not mitigated, destroy the contacts of the switch.

So the resistor prolongs the life of the switch

Check my thread here

https://archivedforum2.beoworld.org/forums/p/32196/249376.aspx#249376

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Jeffrey P Brooks replied on Fri, Sep 17 2021 5:36 PM

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Thanks for the pointer, Menahem.  My old switch died a mechanical death (the plastic part with the spring on it that moves the poles on the switch was broken), not a bad contactor death.  I'll have to open the old one up to see how it looks!