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Guías de reparación e información para procesadores de alimentos y picadoras.

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Fix for wrong voltage used

I have a food processor that was connected to a transformer (to convert AC from 220V to 110V) since it was being used in Spain and one day it stopped working. I want to buy a replacement part but not sure which one to get since I'm not sure how all of these things work... does anyone have any ideas on which part from the image attached would need to be replaced? (if it can be replaced at all). It would be much appreciated!!

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Update (10/01/2020)

Hey,

The make is KitchenAid and the model number is KFP0711WH. There is no indication that there is power unfortunately. It was plugged into a transformer when it stopped working.

I appreciate your help!

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Hi,

What is the make and model number of the processor?

Does it indicate that there is power available i.e. power light etc?

Are you saying that it was plugged into a 220V AC outlet without it being connected to the step down voltage transformer?

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did it start making any noises when you turned it on before it broke? because it might help diagnose the issue.

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@wyatt_boom yes, it was making strange sounds twice before it stopped working. The third time it was plugged in it make a strong sound, kind of like a PUFF! and then it did not work at all after that

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i think that means that an internal component must have worn out

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Hi @Rebeca Marx ,

What is the transformer connected to now, 220V AC or 120V AC, since you said that it "was" working in Spain and your question states "Fix for wrong voltage used"? Where is/was the wrong voltage used as the transformer should have supplied the correct voltage if the supply was 220V AC?

If still 220V AC mains supply, do you have any other appliances that require 120V AC, that can be plugged into the stepdown transformer to prove that it is working OK i.e. 120V AC at its' output?

That may be what you might have to try first, if you already haven't done so, before starting on the food processor.

If there is the correct output then if you have a DMM (digital mutlimeter) use its' Ohmmeter function and with the processor disconnected from everything, connect the meter directly across the processor's power plug pins and check if there is a reading, proving the power cord into the processor. You may have to switch it on to get a reading. If there is no reading on even if there is you will have to open the processor and check the circuit board for any damage.

Post some pictures back here of the board in case you can't see anything (or even if you can).

Update (10/12/2020)

Hi @Rebeca Marx,

I would suspect that the Switch part (control board) as shown in your image has been damaged. Hopefully the motor also hasn’t been damaged as well.

You will have to open the processor and check what damage has occurred to the control board and possibly the motor.

Post some close up images back here of any damage or even if you can't see anything obvious as it may be obvious to others.

If the board is damaged then fixing it (or replacing it) may fix the problem but it may occur again in the future if the problem is being caused by the stepdown transformer not being suitable for the processor and eventually the board will fail again. (see below for explanation).

According to the food processor’s user manual its’ electrical specifications are 120V AC, 60Hz and most probably the mains supply where you are located is 230V AC, 50Hz.

I realize that you have a stepdown transformer but these usually only convert the voltage and NOT the frequency of the supply. They just supply the lower voltage at the same frequency as the input i.e 50Hz. What is the make and model number of the stepdown transformer? There are stepdown transformers that convert both the voltage and the frequency but these are usually more than 3 times the price of the ones that only convert the voltage..

Also the other devices that you have connected to the stepdown transformer may have been designed so that they work at both 50Hz and 60Hz with no problems. Check what it says on the product information label attached to those devices.

Operating appliances at the wrong frequency can cause problems. Here is a link that explains it better than I can. See Case 2: You have 50Hz power for a 60Hz appliance

Update (10/22/2020)

Hi @Rebeca Marx,

A MOV surge protector has blown.

I can only make out a bit of the component value markings printed on it.

If you could gently move it and try to make out all that is written on the component it makes it easier to find the replacement component, and that it is all that may be needed to be replaced for it to work again. Try not to touch the markings as sometimes they rub off easily when handled.

Here’s a zoomed in image taken from your image showing the damaged component.

My eyes aren’t what they were so I can only make out:

top row V (Y?) D R

middle row 1 0 ? 7 1 K

bottom row ? ? 0 4

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(click on image to enlarge for better viewing)

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Thanks @jayeff the transformer still works with other devices. Unfortunately I don't have a DMM.

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Thanks @jayeff - I've added some photos to the post showing the inside of the food processor. Nothing looks damaged and nothing smelled burnt out so I have no idea what it could be.

If I fix this, I would not use it again with a transformer which is the good news. My parents were using it in Spain with a transformer but I live in Canada where I would continue to use it.

From looking at the photos, do you think replacing the switch panel would be best?

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@Rebeca Marx

So where was it used with an overvoltage?

In Spain was it plugged in without the transformer?

In Canada was it plugged into the transformer or direct into the wall outlet?

If in Canada and plugged into the transformer then the noise and the "puff" makes more sense as there would be only 60V AC applied but double the current that is required and this may have burnt out things (hopefully not the motor as well).

If in Canada, direct into the wall outlet then it should have worked with no problems unless a component failed

If in Spain without the transformer then it wouldn't have made any noises before stopping, it would have just blown the components at the connection of the power.

As @oldturkey03 suggested, post some close up images as indicated. You may be able to get away with replacing a few components rather than a whole board. As long as you are handy with a soldering iron or know someone who is;-)

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Rebeca Marx post another good picture of the control board. Focus on the left hand side and see if you can clear the image up. Looks like you may have a blown capacitor. there seems to be some soot as well. Of course this could just be my OPV (Old People Vision). Those are the components that I would expect to have a catastrophic failure when receiving a severe case of overvoltage

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Hi @oldturkey03 I posted some more photos of the control board. I can definitely see some soot when I took photos using flash!

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Would you recommend that I get an entirely new #6?

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