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How to check bad capacitor with digital multimeter give me a solutions

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You need MFD microfared on your multimeter to check it. you can try to ohms it out but most multimeters arent quick enough to chech it. if its a single run you just switch sides (has 2 teminal connections out of the top) a duel run cap will have 3. on a duel run cap you will go from c to either the fan or the herm side. but always back to c. this is how you do it. put black on 1 side & red on the other it should show something & then drop to 0 you have to switch the red & black to check it again. this tells you it works but will not tell you how strong it is. thats where the MFD test comes in. there are numers on the side of the cap to tell you what it should be. normally + or - 10%. if the cap is swollen or looks like its leaking oil its bad

Posted on Oct 15, 2013


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How do i test capacitors on rheem 90-21592-01?

assuming you dont have a multimeter then get a insulated screwdriver and short the post making sure you pull the power to the unit a strong spark means it is good and weak spark means bad no spark means bad and if you use a multimeter the take a reading using the unside horseshoe looking on multimeter is should get a number each time you charge the capacitor match the number

Aug 17, 2014 | Heating & Cooling

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This is the first season I've used my new Gamespy D50 and the flash is not working. It flickers a little and that's it.

Is the display flashing a "RDY", or showing "RDY" steady? These cameras take a while to recharge the 3 250mfd charge capacitors and one or all 3 may be bad..easy to solder new ones in...a digital multimeter with IN/OUT of circuit capacitor test function can be used to read capacitor values...should be +/-250mfd each.

Sep 11, 2011 | Moultrie GameSpy 4.0 Digital Camera Deluxe

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A/C unit fan doesn't run.

Check the fan capacitor.
  1. Using a multimeter to check a capacitor
    Plug the red lead into the positive port of the multimeter. Plug the black lead into the negative port of the multimeter. On some multimeter's the negative port is labeled "common." The other ends of the leads have alligator clips attached to them.
  2. Turn on power to the multimeter. Change the measurement dial to the microfarad capacitive setting.
  3. 3 Connect the black alligator clip to the negative lead of the oil-filled capacitor. Connect the red alligator clip to the positive lead of the oil-filled capacitor. The capacitance, in microfarads, of the oil-filled capacitor is displayed on the multimeter screen. If this reading is 0 or differs from the capacitance written on the capacitor's casing by more than 5 percent, replace the oil-filled capacitor.


Jul 10, 2011 | LG LW7000R Air Conditioner

1 Answer

My philips tv is not working


There may be fuse. Some are located where the power cord enters, check the fuses with the use of analog or digital multimeter, but if otherwise The main cause of this power up problem are bad capacitors on your power if the capacitor is bad.
Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like, to buy a whole refurbish power supply board for the replacement.

I hope this help in solving the problem....

Nov 04, 2010 | Philips Televison & Video

1 Answer

The compressor is not coming on

Is the fan in the outdoor unit coming on? If it is, that narrows the problem to just the compressor or capacitor. If neither is running, check the disconnect or circuit breaker or fuses that are located close to the outside unit. If the unit has power, remove the cover where the power goes into the outside unit, set the thermostat to make the unit come on and see if the contactor is pulled in. If it is, use a meter to check for power on the load side of the contactor. If the fan is running, check the capacitor for the compressor. Most units use one that works both the fan and the compressor. If the capacitor looks swollen then it is bad, otherwise use a multimeter with the capacitor check function to test it. If the capacitor is good, check the compressor motor windings with the multimeter on the resistance function. Let me know what you find and I can give you more advice if this doesn't get you going.

Sep 09, 2010 | Carrier 38CKC036 Air Conditioner

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I replaced the capacitor on the unit. I still do not have the fan blowing on the unit. The capacitor was bad to begin with. Any advice?

Can you check on the fan with the multimeter to see if the coils show continuty.If the capacitor was bad there is a possibility of the main winding heating up to burn and check this out.

Sep 02, 2010 | Goodman Heating & Cooling

1 Answer

How i check capacitors with multi meter

Ideally you want to check a capacitor with a proper capacitance meter although it can be possible to check them with a multimeter.

If the size of the capacitor is very small, say mircofarads you probably wont be able to test it, however we will give it a try.

Discharge the capacitor first by shorting out the pins. BE WARNED!! IF IT IS A LARGE CAPACITOR OR A CAMERA CAPACITOR DO NOT ATTEMP THIS!! Capacitors can be very dangerous if handled incorrectly.

Find the polarity of the capacitor, there should be a black stripe that runs up the side of the capacitor with a negative sign in it, the leg that is closest to that is the negative.

Set your multimeter to resistance, 10k-1M ohm. Put the probes on the legs of the capacitor and instantly watch the display. The multimeter should show close to 0 ohms and then start increasing slowly. This is because the battery in the multimeter is actually charging the capacitor through the test probes.

If the capacitor shows this pattern then you are pretty much assured that it is working properly.

I must say again though, please be careful around capacitors as they can be very dangerous.

Hope this helps and thank you for using FixYa

Aug 28, 2010 | Philips Electronics - Others

2 Answers

Unit wont blow any air and we can hear the compressor kicking on.

Sound like the fan isn't running. This could be due to a bad capacitor for the fan, a blown fuse for the fan, or a bad fan motor. The capacitor can be checked with a multimeter. You should also check to see if the fan has power going to it. If not check for the fuse or a breaker. You can check the fan windings with the multimeter also.

May 14, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Fan motor not I have two caps and dont know which

First pull the quick disconnect (power source). If you have a multimeter with capacitor check (uf) capabilities, look at the side of the capacitor and see what the uf rating is, (should be somthing like 3.5uf or 5.0uf or7.5uf) then stick a screwdriver between both contacts where the wires are pluged into the top of the capacitor and touch both contacts at the same time to discharge any stored electric power, then remove all the wires from the top of the capactor, switch on the multimeter and set it to the uf setting, now place one lead on one side and one on the other, if your capacitor is say a 7.5uf and the reading is 9.0uf or 6.0uf it's bad replace
the capacitor. check both of your capacitors the same way, oh mark your capacitor and the wires so you can put them back together rite. If you don't have a multimeter with capasatence checking capability take them to an appliance shop and let them do it for you.

Jul 03, 2009 | Ruud UAMB Air Conditioner

3 Answers

Humming noise

sounds like the motor is froze

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