With a basic microwave there is a minimum of electronics and the fan starts when the oven is switched on and continues working until cooking has finished. In that case the fan is supplied from the timer and the circuit will be simple to check using a multimeter.
The more upmarket microwaves contain a great deal more electronics and the fan will continue to run after cooking has finished until the circuitry has cooled to a predetermined temperature.
In that case the the checking, fault location and rectification is probably completely beyond even most service engineers - who typically would simply replace circuit boards until the fault is cured...
SOURCE: Bulb blown. How do I change it?
Hello there :
first you will need to remove all of the screws off the back edges and the sides next turn over the microwave over and there will be 6 or 8 screws that are on the bottom edges remove them now turn over the microwave and using a flat tip screwdriver look at the seam and you can use the screwdriver to get the cover to start moving towards the back andd then once it is loose it will lift off
Now you will see the bulb towards the fromnt of the microwave simply replace the bulb and test it the microwave if it works reassemble the microwave and you are done ok ?
I hope this is very helpful for you
Best regards Michael
SOURCE: hi i have a Russell
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.
Hope that helps.
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.
Hope that helps.
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