SOURCE: Have a Siemens Innowave HB86E560B
in 99% of cases the fault is the magnatron a very expensive part if the unit is more than 5 yrs old bin it and buy a new one
i hope this helps
take care
Testimonial: "That's what I thought - thanks"
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.
Load
test.
A
simple safety test.
Place 1/2 litre of water in a glass container.
Measure the temperature of the water.
Place in microwave and heat
on full power for 1minute.
Measure the temperature after it has
stood for 1minute.
If the temperature difference is more than 9
degrees Celcuis the magnetron is working and producing about 700Watts
of heat.
If your microwave is labelled with 900 or 1000Watts. That
is about right.
If the temperature is less then the magnetron is
not working properly and may need replacing.
This
a only a rough guide and any doubts you should consult an authorised
service agent.
Replacement of the
turntable motor should be carried out by a qualified appliance repair
service.
YOUR
SAFETY IS PARAMOUNT!
Attempt
this only if you are competent.
But here is a basic method if you are
mechanically minded and have electrical safety knowledge.
The motor assembly is fixed to the base
of the oven usually with two screws and access is obtained usually by
removing the inspection plate directly beneath the motor. It is
usually a plug in synchronous motor that revolves at a few revs per
minute but the plastic cogs in the motors gear box fail and the motor
assembly must be replaced. They are fairly inexpensive and obtainable
usually from a domestic appliance repair shop.
If you feel
confident, disconnect it from the mains power, remove anything in the
cavity and turn it upside down if it is a tabletop model, a little
more complicated if it is built in!
Remove the inspection plate,
sometimes it must be cut out with sharp cutters, and disconnect the
motor. Remove the motor and go and get a new one. Fit the new motor
and fit the inspection cover back on the base by turning it to fit
and using an extra screw fix it then put the microwave back in its
position. Plug it back in, with the turntable and plate. Put a cup of
water on the plate inside of the oven and heat for 20 seconds to
check the plate goes round.
Hope this helps.
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