How to wire the transformer and capacitor and magnatron in a kenmore 665.61632100 microwave

One side of the high voltage winding is usually connected to the frame of the transformer. Verify to make sure this is the case. The other end of the winding goes to the capacitor terminal that's not connected to the rectifier. There should be another high voltage wire that goes from the rectifier side of the capacitor to the magnetron. And, there should be two wires that go from the filiament winding on the transformer to the magnetron. The primary winding should be connected to whatever supplies 117 vac to it.

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Most of the time if the unit won't hest anything, the problem.is the power diode.

If you are familiar with working with very high voltage, open the unit, carefully discharge the power capacito using an insulated screwdriver.

Now look for any loose wiring. Reattach any loose wires to their contacts.Check and replace any blown fuses with identical ones.

Now, locate the piwer diode in the high voltage circuit and test it for function. This diode is often the only problem. I have repaired many microwaves by only replacing this diode.

If everything checks out so far, read the schematic and test the large step-up transformer. Afterwards, check the circuitry containing the magnatron.

Except for the transformer and the magnatron, the unit will be worth repairing. If the transformer or magnatron is the problem, the cost of the replacement parts is higher than a new unit.....unless you happen to have the right working part lying around.

Hope this helps. But remember, ALWAYS discharge the high-voltage-capacitor.....the charge is enough to hurt you SEVERLY!

you need a meter than has the ability to check capacitors. These meters are generally more expensive like 150 bucks and mostly sold for HVAC techs. You disconnect all wires to the cap and connect your test leads. The hum is usually the transformer getting ready to die. Just keep using it until so. The transformer will run you about 130 bucks I think.

The first thing you need to do is read on how to discharge the high voltage capacitor to avoid injury or death, after you have done that you will be able to start chcking inside the unit.
Step 1, Remove the cover of the unit, being careful not to touch any of the components inside.
Step 2, Once the cover has been removed you need to discharge the high voltage capacitor to avoid severe injury or death. Once you have done this you can now start to find the source of the problem.
Step 3, The most common fault with microwaves doing eveything but heating is caused by the high voltage fuse becoming faulty and/or the magnatron assembly. To test the high voltage fuse you need to remove it from the high voltage capacitor and the transformer, a large metal block looking thing, and simply undo the plastic casing that the fuse is within, you should be able to see if it has blown as the fuse will be black inside the glass or the small wire will be visably broken.
Step 4, All you need to do now is source a high voltage fuse from an elctronics dealer or the authorised repair agent making sure its the correct voltage and amp rating, they normally come in 750mA and 5kV, that is, 750 milliamps and 5 kilo volts. Once you have the fuse simply replace the blown fuse with the good one and test the unit by heating up a mug of water.
Step 5, If everything ran and tested ok you can now replace the cover and continue using the unit, if you found it still isnt heating you need to replace the magnatron assembly, remember to unplug the unit and discharge the high voltage capacitor before touching anything inside the microwave, you can find the magnatron assembly, normally above the transformer, it is a cube shape with grills on the side and also contains some high powered magnets, so if you find your screw drivers being pulled towards a large cube shabed box, chances are you have found the magnatron assembly. Replace this and all your problms should be solved as far as not heating.
Good luck.

Before you remove the microwave casing, you need to read up on how to discharge a high voltage capacitor, i'd explainb it here but i feel much safer if you were to look it up and fully understand it before attempting any repairs as the high voltage capacitor can cause fatal injury and/or death.

Ok, after reading up about how to discharge a high voltage capacitor, this is what you need to check out.

Step 1, remove the microwave casing and discharge the high voltage capacitor to prevent injury or death.

Step 2, Look for the fuse which you may find in a small plastic case with wires coming from each end, one end leading to the high voltage capacitor and the other end leading to the transformer and the magnatron assembly, the magnatron, or maggy, has a cube-ish shape and contains magnets which are visable through the grill. You will be able to see with the naked eye if this fuse is faulty as it will look like a blown fuse, if so, replace the fuse.

Step 3, At this point if you have a spare fuse you can VERY CAREFULLY plug the unit in and VERY CAREFULLY test it to see if it heats, if it does heat then VERY CAREFULLY unplug the unit, discharge the capacitor, and replace the case. If it still isnt heating you will need to replace the magnatron assembly, contact your authorised repair agent or the manufacturer or the microwave for directions to spare parts. Be very careful with new magnatron assemblys because if you drop it, you will damage or fracture the magnts within and render it useless.
I hope this helps. Good luck.

Sounds like a fault on the magetron power supply.

If you are confident enough to ground and discharge the main capacitor, check to see if it is faulty.

Check for arcing or scorch marks around the transformer and check the HV lines on the magnatron input for continuity.

If the capacitor has blown out, this can be replaced, however if the magetron or transformer is faulty this is a much more complicated repair and should only be done professionally.

Have you checked out your waveguide and stirrer? Also ensure you have good connections & earths.

Almost certain your magnatron has gone or the capacitor and HVdiode. Normally the cap and diode is my first area.(assuming you dont have testing equiptment) With long nose pliers remove wires and diode from the cap. Dont touch the terminals as there is voltage there. if you discharge che cap and it flashes, the cap is ok. Replace the diode then. once done it no heating still, replace the magnatron.(Taking it that the transformer isnt blown)

very possible your magnatron is faulty. Disconnect 2 transformer wires and make sure they dont short. try the program again. if no noise, replace magnatron:capacitor and HV diode Please i strongly suggest an electrician help you as it is truely dangerous in there. .

The magnatron, HV capacitor or the transformer. Dangerous place to work in the High Voltage section. Cap can hold a charge so short to ground after unplugging when working around it. Unplug one at a time starting with the mag and see which one is causing the draw.
eric