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I would say you have blown a fuse on the unit. As you now have found out, that's one of the reasons why you unplug any electrical equipment before working on them. You will have to take the outer cover off the microwave and locate where the fuse is. It is most likely on the back of the main PCB or possibly inside a plastic sleeve or mounting near where the cord enters the unit.
Inspect the power cordUnplug
the power cord and check for voltage at the outlet. Also inspect for
damage, shorts, or burn marks that can be a possible safety hazard.
Bad door switchIf your
microwave does not work at all and you know everything is plugged in
properly and the outlet is functioning, then also check the door hooks
and the door release button. Using a volt-ohm meter on RX1, check your
terminals. When your microwave door is closed you should have a reading
of zero. Once the door is open the reading should change to infinity. If
these readings do not match up, replacement of the door switch is
Blown fusesTo determine
if your fuse has blown out, which may attribute to your microwave not
running, you need to pull the fuse out using a pair of fuse pullers. Lay
it down and using a volt-ohm meter on RX1, check both ends of the fuse
in question. If you do not get a reading of zero, then you will need to
replace the fuse.
Bad fan motorLocate the
fan and remove the leads. Again using the volt-ohm meter on RX1, check
the terminals. If an infinity reading is displayed, it means that the
fan has gone bad and requires replacement.
Light bulbIf your
microwave light bulb is not working, perhaps it has blown. The first
step is to replace the bulb and power on the microwave. If this does not
correct the issue, the next step is to check the socket and wiring to
verify if that is the problem.
Light bulb socket & main control boardIf
your microwave light bulb is not working after the installation of a
new bulb, check the light socket as well as the wiring to ensure they
are properly operating. If these sources are functioning properly, the
next step is to check for a faulty control board as a possible root
cause to your microwave light bulb malfunction.
Just open the top cover and find the location of the bulb , it may be
in the right side near the control panel. Remove the bulb and get a
similar bulb with the same rating from any electrical shop and fix it
This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.
This can often also affect the exhaust fan operation, too. The lights and fan can be inoperable or stuck on too.
Details of our service and critical safety information and disassembly information is at our site, linked here on Fixya: http://tinyurl.com/yzjozk