Question about Sharp R-1405 / R-140 Microwave Oven
I've had this microwave since late 2005 and in the last 6 months or so it has started switching off after 3, 5 or 10 seconds of the heating cycle. It has even tripped the breaker (15 amp) a couple of times recently. This followed after the display started showing digits only partially. Now the display shows nothing and there is a click, click sound coming from the control panel every time I hit START and the micro switches off. I hit STOP, open then close the door and the micro starts "blowing" for 10-20 seconds (but it does not warm up the food) and then stops. Please help. Thank you for your time.
Same switch problem with my R-1851A but it appears the switch was damaged by the door latch. The lower door latch is bent inward slightly and only hits half of the switch, eventually wearing off a corner of the switch's plunger. This prevents the the switch from getting fully closed without several hits on the open button. Only the lower switch needed replacing.
Posted on Aug 04, 2009
We repair these control units for $39.95 nationwide. Usually a new one is not needed.
We have info on our service, plus critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk
Posted on Nov 22, 2007
A 6ya expert can help you resolve that issue over the phone in a minute or two.
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Posted on Jan 02, 2017
Tips for a great answer:
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 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
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. Check this link to
know how a microwave works:
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