Question about Sharp R-630D Microwave Oven
1)-The small alphanumerical dots that make up the LCD display are starting to drop out (not seen) making interpretating the display difficult when running or inactive.
2)-Another recently surfaced problem is that the the unit will cut-out heating while the carousel still turns and countdown timer continues until the end of the requested cooking time.
Regarding #1, the display problem, I tried unplugging the unit from the power source, waiting at least a minute, then re-connecting the power cord. This action does nothing to help the display, although...once in a while...the display will suddenly work as it did when first purchased. This state usually lasts all but a day at the most before reverting back to the described problem state as mentioned in #1 above. I even tried to use my fingers to lightly run across the membrane type keypad to feel anything 'odd' where the contacts are located underneath. I felt nothing unusual.
Regarding #2, the power cutting out, I tried connecting/re-connecting the unit from the power source with no success. The unit does heat the contents and the carousel does turn, but the power intermittedly stops premature during a heating session. This is a noggin scratcher for me.
Hope there is something I can do to resolve this sate of my unit. Thank you in advance for your answer(s)!
EZ of NJ
Problem #2 is a bad door switch or door switch mount.
Problem #1 is a trouble with the control unit / display.
The avergae do-it-yourselfer can replace a door switch if he follows the proper safety and repair advice.
We repair control units on a regular basis for customers nationwide with our guaranteed $39.95 service.
We have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk
When you get to our site, do a Ctrl-F search for R630.
We also have the entrie service manual for these on our site.
Posted on Nov 05, 2007
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Posted on Jan 02, 2017
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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..
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