In article ,
Roger Mills writes:
On 06/01/2019 14:05, D.M. Procida wrote:
The microwave part of our oven has stopped working, though the electric
oven and grill work normally.

Will the magnetron or its control board be likely to have fuse separate
from the main fuse? Or is this most likely a failed magnetron?

Thanks,

Daniele


There's probably a 10A slow-blow fuse hidden inside somewhere. If that's
blown, replacing it may fix the problem - but it's more likely that it's
blown due to something else.

Once common cause of failure is the microswitches on the door. These are
to prevent the microwave from operating unless the door is fully closed.
These are wired in a way which causes the fuse to blow if one of them fails.

In this case, the cause should be found and fixed. Worn door mounting
and catches are common. The manufacturers will also always replace the
microswitches once they have shorted out the supply to blow the supply
fuse. Worn microswitches can be the cause, but they are not designed to
continue providing protection after they've shorted out the supply once.

The high voltage fuse can simply blow with age - they are very closely
rated to the running current, as the transformer is not capable of
providing very significantly more than this when shorted, so a wide
fuse margin would not provide suitable protection. The symptoms
described don't match the HV fuse as having blown though - the
timer/controller would still work in this case.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]