Question about Sharp R-1870 Convection/Microwave Oven

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Sharp microwave wont heat at all.

Convection seems to work. Microwave not at all. Makes a louder racket than normal. Door switches test ok. Except lower door switch tests closed all the time. I wouldnt think closed would be a problem? Where else do I go from here? Thank you for any help

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Posted on Nov 24, 2013

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SOURCE: Microwave auto-starts when door is closed

the buttons recently stopped working sporadically and now everytime I open the door, the unit turns on. The only solution was unplugging.. Is there a fix short of replacing it?

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SOURCE: 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

Posted on Jan 08, 2009

MicrowaveSvc
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SOURCE: Have a Sharp R930AK microwave.

You probably have a problem with the bottom door switch, or its mount may be loose or damaged.

We have the service / repair manual for this model and have uploaded it to our site here for free download to help you.

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

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

If a switch is all you need, we offer a universal type for only $5 postpaid which you can order here.

Even though a door switch clicks, it may still be bad inside.

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

If the switch mount is broken, it's usually more economical and safer to add a dab or two of hot glue to the mount to secure the switch. Let it cool for about 30 minutes before using.

If you still have questions, please reply back, otherwise...

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

Posted on Jul 30, 2009

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Sharp R-930CS microwave turntable stopped turning and neither convection or microwave are working (ie. not heating). Lights and fan turn on and counter counts down normally.


Look inside for one of many thermal cutouts (button type) test each for continuity (with the unit unplugged of course). Also look for burned wires and repair or replace them. If you get it running and it works fine... we're done. If it still acts up then replace the magnetron and or the capacitor.

Oct 19, 2013 | Sharp Microwave Ovens

1 Answer

Hi, I have a sharp R-959M-a/R-98STM-AA, it's a


This sounds like either a door switch or a cook relay on the control board.

Sep 17, 2013 | Microwave Ovens

1 Answer

Sharp convection microwave oven model R1875F. It's cooking on the left side faster then the rest of the oven. It seems to burn on the left side and not cook in the middle.


see the next causes. God bless you
Diode The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.

Door Switch If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.

Magnetron If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.

High Voltage Capacitor If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.

High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.

Thermal Fuse If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Thermoprotector If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Main Control Board If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.
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Oct 03, 2012 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Hello, i own a 7year old advantium oven everything works except the microwave, the key pad and timer shows its on but wont heat. any suggestions thanks


Is there any unusual noise or is it louder or quieter than normal?

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.

If it sounds the same as usual or a little louder, I would suspect the magnetron or high voltage diode has failed.

If it is much quieter than usual I would suspect a bad upper door switch.

The service manual is here.

Also see this file on door switches.

Aug 22, 2010 | GE Advantium 120 Convection/Microwave Oven

1 Answer

Microwave does not heat food


We have service manuals at our site which will help you:
http://www.microwavedisplay.com/r1850_r1851_sm.pdf
http://www.microwavedisplay.com/r1850a_r1851a_r1852a_sm.pdf

Some questions to ask as you or someone you know checks it out.

When you try to microwave are the inside light, internal cooling fan and turntable all working?

If not, then it may be as simple as a door switch.

If so, then it may be a bad magnetron. It can be tested.

Is there any unusual noise or is it louder or quieter than normal?

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.


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


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

May 15, 2010 | Sharp R-1850A Convection/Microwave Oven

1 Answer

I've a Sharp R-953. convection+ microwave makes a lot of noise


check the fan blade on convection, may be loose.

Oct 30, 2009 | Sharp Microwave Ovens

1 Answer

Sharp R-1870 Convection works, microwave doesnt heat


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

Microwave Oven Basic Troubleshooting Tips

heatman101

ytwyys

Oct 07, 2009 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Microwave not heating up


Check the door switch, when it is faulty the oven will turn on but turntable, fan and magnetron wont operate.

Regarding parts, contact the seller here to purchase parts.

You can also order from MicrowaveSvc , they also provide parts.

Jan 13, 2009 | Sharp R-1850A Convection/Microwave Oven

1 Answer

3 year old unit, oven works, microwave does not


hi,

You may need a new magnetron, contact sharp or the store you got it from; most microwaves have a 3-5 year warranty on the magnetron. If it's not in warranty, find a good appliance repairman, this is a difficult and dangerous repair job.

Apr 03, 2008 | Microwave Ovens

1 Answer

Wont heat items in the micro or convection


MODEL NUMBER NEEDED

Apparently this is not actually an R-510HK since that model does not have convection mode. Can you reply back with the correct model number? We may have the service manual for you.

A PRELIMINARY OPINION

It sounds like you have loose door switch mounts or possibly loose door hinges.

If the door won't open via the door open button, then the outer cover will have to be removed.

BEFORE YOU RATE THIS

This is a preliminary post, asking for further information (model). Please withhold your rating until we actually offer the solution.

Dec 06, 2007 | Sharp R-510HW Microwave Oven

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