Cracked door on Panasonic S753 combi microwave oven

The inside of a microwave oven has a special paint on it. If the paint becomes damaged, the microwaves strike the bare metal and arc. This leaves a burn mark. It will also ruin the magnetron inside the oven.

HI:
You have a faulty door switch, the unit is not supposed to come on when the door is opened only the light.This unit may require servicing as the control board may also be at fault.

check the door switches

not sure on panasonic but most of them turn with a little gear drive. maybe the gear is stripped or off location.

Thanks for that ID number. That's a big help.

Now, looking at the schematic, it's clear that you would have a shorted primary latch switch (top door switch) or that switch's mount is damaged.

For safety, disassembly and diagnosis of door switch trouble, see my generic files:

http://www.microwavedisplay.com/safety.txt
http://www.microwavedisplay.com/disassembly.txt
http://www.microwavedisplay.com/doorsw.txt

If a switch is all you need, we offer a universal type for only $5 postpaid which you can order here.

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hi, check that the cooling fan is operating and to sufficient speed to cool the magnetron or the thermal cutout mounted to the magnetron will cut power

hardware store..

the main control board is "seeingf" a high amprage draw from the inverter board . you have a problem with the inverter or the magntron . parts are more than a new unit . try to stay away from the inverter type , there just not ready for prime time . google "panasonic inverter reviews " and you will see just common your problem is good luck

Hi , Either you have a faulty door interlock switch(es), or the door latches (on the door) have been damaged and will not activate the interlocks. either way, you have to be conversant with adjusting microwave latch assemblies once the repair has been effected AND THE USE OF AN OVEN LEAK DETECTOR IS IMPERATIVE for final testing or the end user will be subjected to harmful levels of microwave radiation.

The 22 seconds is the giveaway.

In most cases, this is a problem with the inverter or a bad magnetron.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

I would recommend that you contact your nearest Panasonic-authorized servicer.

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