Good day,subject: LG microwave oven MS3448XRS not warming contents.Checked High voltage transformer 240 volt AC input-ok.Measure primary winding(0.2-0.4 ohm) measuring 1.1 ohm,secondary winding(70-100 ohm) measuring 130 ohm.Do you think HV transformer is faulty?Thanks
SOURCE: Microwave - no heat
The filament reading sounds fine.
Here are some links you or someone you know can use for test help, but read their safety warnings first:
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html
Many brands have a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.
Please reply back with your brand and model number if you need further help.
We're happy to help and we appreciate your thoughtful rating of our answer.
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 PARAMOUNT
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.
Hope that helps.
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