Question about Microwave Ovens
Sounds like a door switch, check all switches if they're good it's the pc board
Posted on Feb 05, 2010
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Posted on Jan 02, 2017
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Nov 06, 2012 | Microwave Ovens
Apr 06, 2017 | Sharp R-403HW Microwave Oven
In this case as the display does not show a clock then it seems the program controller is not working correctly. So check power - step down supply, if the pads are responding- if not faulty pads. Also the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean,solder and reset the board.
Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html
Now unless the display works and the processor starts to switch on the MAGNETRON , the table and light will also switch on as it must heat.
So it is necessary to check the main controller unit as it seems to be the suspect..
Aug 23, 2011 | Sharp Microwave Ovens
Jul 20, 2011 | Sharp R-930AK Convection/Microwave Oven
If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if contact is not through the microwave will not work.
Now keeping clear of the microwave, switch on, use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type. In this case it seems that the program controller board has errors specially if the oven heats and shuts off. remove the board, clean and reset.
If there is heating without any issues, you can use the microwave safely
May 16, 2011 | Microwave Ovens
Replacement of the
turntable motor should be carried out by a qualified appliance repair
SAFETY IS PARAMOUNT!
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.
Jan 13, 2011 | Sharp R-1870 Convection/Microwave Oven
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Feb 17, 2008 | Panasonic NN-S763BF Microwave Oven
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