Hi Everyone,

I want to know if there is supposed to be 112vac on the top of an electrolytic cap. I have two in the power supply of the washing machine, and one has 112 vac on the top of the cap and the other one doesn't, which one do I change?

Thanks for any help, advice or assistance you might offer.

Mr QA Man

 

How do you know it's AC?

 

Tested it with a multimeter

 

What is the reading when the meter is set to DC?

 

0v

 

What value is the capacitor, voltage and capacitance?

 

4700uF 200v

 

It may be just a low current leakage. The voltage should collapse to zero if given a low resistance path to ground.

Are these metal can type with a holding strap and sheet metal screws into the chassis?

 

No, they are soldered into the main board, right next to the rectifier and motor controller.
Direct drive dc motor for wash, rinse and spin functions, only it doesn't wash, rinse or spin.
The rest of the machine works fine, water fills up, lights flash at the right times, timer function works, etc....

Just the drum doesn't spin and this cap has 112 vac on it's top and the other one doesn't.

 

Have you checked the rectifier?

 

The caps are after the rectifier... if it was bad there wouldn't be any voltage?

 

Oh well, it's late here in Australia, and I have to work in the morning...

Thanks guys!

 

Any of the rectifier diodes could have failed short-circuit so you could still have voltage at the output side. I'm surprised that the capacitor hasn't burst if it really is getting 112VAC.

 

Hi Everyone,

I want to know if there is supposed to be 112vac on the top of an electrolytic cap. I have two in the power supply of the washing machine, and one has 112 vac on the top of the cap and the other one doesn't, which one do I change?

Thanks for any help, advice or assistance you might offer.

Mr QA Man

Can you post a schematic of the board, or a picture of the wiring diagram, and the voltage reading across the cap with no AC across it, please?

 

You need to check the solder connection on the bottom of the board.
If the cap has a broken connection to ground then you could see an AC signal on the case of it.
Use the multimeter to check the voltage across the two pins of the cap where it is soldered in. You should see a DC voltage and may or may not read AC voltage. Check for both.