Sharp 1100 w Microwave Model R-420BK - Clock display not working correctly
My microwave (Sharp R-420BK) has worked fine until I moved it, recently. Now the clock display is "messed up". There are numbers, but they don't display correctly. It is as if some of the lights on the clock display don't work, making the numbers display incorrectly. The touch pad works fine. The microwave heats just fine. Everything else is perfect except the digital numbers don't display correctly.
Do you know what I need to do to fix it, what part I would need, and if the repair is even cost effective for this model microwave?
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The Child Lock prevents unwanted oven operation such as by small children.
The oven can be set so that the control panel is
deactivated or locked. To set, touch CLOCK, the
number 1 pad and then touch the START pad
and hold for 3 seconds. Should a pad be touched,
will appear in the display.
To cancel, touch CLOCK, the number 1 and
On most recent Sharp microwaves, the fuse only interrupts main power, so if the fuse is blown, it will be totally dead.
first thing I would suggest is a hard
reset. Unplug the unit for a
minute or so. Then plug it back in, set the clock and try again.
If that doesn't work,
leave it unplugged for about 5 minutes then try it.
Then chances are you have a failed microwave display. Unless this is an over the range, touch screen, or convection type, it's probably not worth repair, but you can get more information on such repairs here.
happy to help you with free advice and we'd appreciate your thoughtful
rating of our answer.
Not a complete answer, but may help describe problem: Our R-510B should be the same except for color, and for several years it has intermittently messed up its display. The left side two segments on the units digit won't light up. So a digit 8, without the two vertical bars on the left, comes out as a letter E reversed left to right. Any digit that uses the two left segments (traditionally labelled segments E and F when talking about 7-segment displays) comes out wrong. Every thing else works fine. I can't tell if this is your problem.
This is almost surely a bad contact at the interface between the LCD display panel and the PC board: Typically there is a "squishy" conductive strip that connects them, and I expect grease has gotten in there. If so careful disassembly and cleaning with a mild solvent should fix it. Since we can live with it, and it usually fixes itself in a few weeks, I have not got around to taking it apart.
normally you look for the clock ot watch icon. Pressing it once will give you the option for 24 hours setting. Press it twice and it will give you the opportunity to set to 12 hours setting. Using the no. keypad, punch in the time and then repress the clock icon again.
Disconnect the power for 30 seconds. After restoring power, do not set the clock.
If your model has an ON/OFF clock display, you can choose not to have the time displayed.
To choose this option, press the 0 pad for about three seconds. To Turn the display back on, press the 0 again.
Touch the clock pad. Enter in the correct time of day by touching the numbers in sequence. Touch the clock pad again.
This is a common problem. i havent completly solved it yet but this helps.
Be very careful doing this, There is Voltages with AMPERAGES high enough to boil your blood inside a microwave.
I had mine apart cleaning it. Only one number worked on my display. I wiggled and messed around with the wires in the back of the display. And almost every number in the display works again. Hope this helps.