Question about Sharp Microwave Ovens

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My R-1870 microwave oven is completely dead. No display no response to keypad entries. No fan, No light below the oven. No light in the oven. Checked the circuit and there is 110v to the plug.

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A microwave can be dead for many reasons.

It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

You can probably find exploded views and order parts by entering your model number here at the Sears parts site.

The best place to order Sharp parts is Tritronics.

We have the full service manuals for this series of ovens and have uploaded them to our site here and here.

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Jul 13, 2008

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Bare ile bo100 microwave won't go keypads seem to be ceased lights ok on display pls help


You can try unplugging the oven for at least 15 minutes to see if the control panel will reset on its own.

If that doesn't fix it, you might have a bad control panel, or oven may not be properly grounded.

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I have a Maytag Microwave/Hood MMV4203DS00. Twenty minutes after its last use as a microwave oven, the Vent Fan spontaneously went on and the Display Shows: VENT...FAN..--5E-- (or SE?). The microwave...


"SE" error means you have a shorted membrane keypad.
On this model, the membrane keypad is not available as a separate part, so the control panel frame assembly (which comes with a new keypad) would have to be ordered and replaced.

It's actually a pretty simple DIY repair.

The frame assembly is part number W10258190 and you can get it for $67.98 (subject to change) from the Pros here. You can also order the thermostat (part number WB27X10567 ) from them.

Their is a video here showing how to remove a typical over the range control panel assembly in under 5 minutes.

Then you unplug the keypad as per the photo below.

9_24_2013_12_08_39_am.jpg

Some connectors on the relays have a lock:

positivelock.jpg Then move your circuit board into the new frame. Be careful, the display is made of glass.

Sep 01, 2013 | Microwave Ovens

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Samsung Microwave Mod # SMH9187ST. Starts on its own, "bake potato" on display screen. After shutting down, code SE appears on screen. No response from keypad until unplugged. Reset and problem ret


Contact Samsung, I was having a similar problem with the SE error appearing on my microwave. Apparently its a problem with the control panel and they are going to replace it free of charge under there epidemic warranty

Mar 18, 2013 | Samsung SMH8165W Microwave Oven

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Blinking electronic display on microwave


see the cause and proceed according. God bless you
but can not program unit, Touchpad dead If you have a stuck key or non-responsive key, most of the time you will have to replace the keypad for this microwave oven repair. If your keypad is connected to your control board by a flat ribbon wire, try disconnecting it and clean the silver contacts with an ordinary pencil eraser. After cleaning, plug it back in and try it. If it doesn't fix it, replace the keypad unit. Some units actually have keypad tests to confirm your diagnosis of a bad key.If your keypad and control is the same unit, replace that unit. Another note, unlike stove/oven keypads and controls, most microwaves do not have error codes or tests to distinguish whether it is truely the keypad or control. Most of the time, it is the keypad that needs replacing, but a small percentage of the time it can be the control. Check the tech sheet if they can point you to the right part.

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Microwave Model JVM 1870 stopped heating, all else works (timer)


Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

ggk

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My sharp carousel II microwave doesn't seem to have power. I checked the power source and that seems fine. Is there an internal fuse?


Is it dead, meaning no display, no light when you open the door and no beeps when you press a pad on the keypad?

We have the relevant service / repair manuals for this model and have uploaded it to our site here and here to help you.

They will give you safety info, step by step help in disassembly, troubleshooting tips, and part numbers.

Most computers will open these documents automatically, but you may need the free Adobe Reader

I would suspect the 20A ceramic line fuse or the magnetron temperature fuse.

You can order parts from Encompass here or you can call them toll-free at 866-779-5835.

20A ceramic fuses are available at local appliance part stores or places like Wal-Mart and Lowe's.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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1 Answer

Sharp 1870 just quit cooking and no turntable


The fact that the microwave and convection both do not heat indicated that the oven is in demo mode, check the user manual, otherwise it will possibly be a relay not triggering, may need a pcb replacement, check Demo mode 1st....Phil

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