Question about Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener

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Capacitor Short after Gear Assembley Replacement.

After changing the gear assembly the capacitor shorted. Can this be replaced without concerns about the other components or motor?

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  • Anonymous Feb 28, 2009

    i have bosch garage door drive and requieres capacitor replacement .pl advise



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Asolutely , capacitors are what we call in the buisness ,starter motors, theese cylinders hold the juice to start the motor in motion ,,do yourself a favor ! don,t buy this part from a garage door supplier because they will get you for 20-30 bucks , Instead go to any good electronics store , and i don,t mean Radio Shack, You want to go to a store that carries electronic parts such as diodes and computer coards and led lights because theese stores also carry capacitors and lots of them , I pay at my local electronics store about 7 bucks and as long as the ratings the same it will worf fine also if the rating is a little higher it also will work , bring your old capacitor with you so they can match it , I go to a place in pompton plains,n.j. called Wayne Electronics they might even be able to ship it to you in the mail if you don,t live around the area , well good luck and i hope i was able to answer your question, Thank you for the oppurtunity to help you , Sincerely Glenn Mayer

Posted on Mar 05, 2009


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Ouch. Magnetron check performed with multi meter.

1) Disconnect power to unit
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Probe the low voltage side first, open circuit? replace. a low reading is normal, high voltage side is a two part process, take a reading between the two terminals one goes to the magnetron the second to the capacitor directly. this should be approx the same reading as the LV coil. The last and most important coil is to check the coil side ofthe barrel fuse to ground, this will measure between 80 - 150 on a digital meter, around 90 to 100 for a 900w is in the normal range.

Loud humming is created primarily by having a working transformer with no wher to send the voltage out.

It will only be one or more of these three items, which will cause this, the rest is safety and control gear.

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