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Old 05-31-2018, 11:12 AM   #43
redwire
Badcaps Veteran
 
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 1,154
Default Re: Repair Fence Energizer SS-1000E Fi-Shock

Quote:
Originally Posted by stormy1777 View Post
... the fuse is OK, b/c it has 230vac across it.
No, if there is a large voltage drop across the fuse, it has high resistance.

Sometimes corrosion or carbon-tracking can wrongly give low-ohms reading to a part (resistor, fuse etc.) and then the part open-circuits when powered up.

I learned big capacitor C1 16uF/400V is a MAP AC motor starting cap, polypropylene film dielectric but oil filled. These have an internal safety pressure-switch that open-circuits the cap if pressure gets too high. Not relevant here but good to know, this type of (film) caps can go open.
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