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Kenwood CJ/AL28 microwave does not heat the food anymore...any reason why?

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Check the high voltage fuse between the transformer and the capacitor, had the same problem with mineand this fixed it. Not an ordinary fuse though (5Kv 0.8a), cost me about a fiver.

Posted on Nov 02, 2008

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Confirm 110-120 volts AC is entering the primary coil on the high voltage transformer....meter works but can be fooled, I usually rig up a light socket and household light bulb and hook that to the 2 input wires for the transformer and see if the light works or not when you run the microwave....can even set a power level and watch the light go on and off. Discharge the capacitor first before attempting any checks or tests.

Scary but works!....

If ok, put those 2 wires back on the transformer. Discharge the capacitor .
Remove the 2 wires going to the magnetron....run the microwave a few seconds ( 2-3 ) and remove power....again discharge the high voltage capacitor . If you got a good crack&spark when you discharge the cap the second time you are creating high voltage but not using it ( bad magnetron or loose High Voltage wire somewhere )....if you get no crack&spark you are not creating high voltage.


How to check a common high voltage diode - click here. Check the diode with one end off/disconnected....should show continuity one way, reverse your meter leads and none the other way.....many meters are not high/good enough and often show no continuity ( infinity ) in both directions. A full continuity reading in both directions (0 ohms) on the diode may be shorted/bad one!
Many microwaves however have a defect in the microwave distribution system which causes the magnetron tube to overheat and cut out and/or damage the diode.

thanks.

Posted on Oct 16, 2008

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It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.

YOUR SAFETY IS PARRAMOUNT

This is a job for a professional but if you are safety clued up, here's instruction.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
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Hi and welcome to FixYa, I am Kelly.
POWER OFF / UN-plugged
To gain acces to the motor the outer chassis must be removed. 4 side scews and 6 rear screas.. then life the rear of the outer cabinet 10 degrees and slide it aft to unlock the front tabs. Then remove the cover. Before you do anything; take a good screwdriver held by the handle and ground the HV capacitor 3 times across the 2 terminals to prevent a horrible shock.

The turntable motor will accept input (0utlet) power when disconnected and a test cord connected to the turntable motor PN TYJ5807A. Some of these are 24 Volt motors... make sure you look on the motor to determine the voltage. You can test the motor for resitance on R x 1,000 scale. I should read resistance to the 2 terminals only and NOT to the case. If it reads from either terminal to the case the motor has failed. The windings in these motors are MUCH thinner than human hair. http://www.buyspares.co.uk/search.pl?query=TYJ508A7
or
http://www.4kenwood.co.uk/cgi-bin/product.pl?PID=944115

Take a good look at the motor drive post and make sure it matches yours. I could not find an exact parts break down for the CJ/AL28 but most turn table motors are common in a brand.

Thanks for choosing FixYa.
Kelly

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