20 Most Recent Sharp R-1850A Convection/Microwave Oven Questions & Answers

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electro-medical.blogspot.com/ http://electronicshelponline.blogspot.com/

Chances are you have a bad damper switch or wiring. A sample photo is here: http://207.234.249.73/mwd/damper.jpg It might also be a problem with the humidity sensor or a problem with the control panel, such as corrupted code or bad connections.

Hi,

I see its some time ago now that you posted this and perhaps you've fixed your micro already or replaced with a new one. I have the same Sharp r-967 microwave which had the same 59 second problem. I researched a bit online found the sevice manuals and tracked the problem down to be the damper motor. I managed to buy one online and replace it quite easily. There are some diagrams online when searching for this problem but for different sharp models where the damper is near the door fixings. Its not the case on r967, its behind the circuit board and easy to remove with a stubby screwdriver. You can find spares from this place. 5 minute job. The 59 second thing is likely to be the either the door switches or the damper motor. Switches are between £5-10. All mine were fine so didnt have to replace any. A quick voltmeter test can check them.

http://www.sharp-parts.co.uk/shopexd.asp?id=76

I paid £26 in delivery. Hope it helps if not too late!

cheers

The damper should closed when in convection mode and open when in the microwave mode, to keep the heated air inside the cavity.

This sounds like either a thermistor or a damper switch/motor problem.
Amana's technical support line is 866-426-2621. This is the commercial side but they should be able to get you in touch with the domestic side.

replace the damper door motor. should solve your problem.

Usually this can be done easily by removing the door unit and removing the panel to the door wherein you will be able to get access to the door lock. If there is no damage to the pivot or the post to hold the lock and spring , you can push the spring and reset.

This unit has a three way exhaust capability on it. There is a plate on the back that you remove to set the blower housing to back, top or frontal exhaust. You take the plate off and then just lift the blower assy. up and then reset it back into position for the direction that you want. It may be missing the vent louver for outside exhaust if it wasn't left with the unit when it was installed.

turntable motor p/n 46-841666-3, available from searspartsdirect.com, use correct model #!!

That's almost certainly a bad secondary interlock (bottom door switch) or maybe its mount is misaligned or broken.

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.

One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Once you've done that, the switches are accessible.

We have the service / repair manuals for this model and have uploaded them to our site to help you:
http://www.microwavedisplay.com/r1870_r1871_sm.pdf
http://www.microwavedisplay.com/r1850_r1851_sm.pdf

If you only need a switch, you can order a universal type here for $5 postpaid.

Otherwise, you can find links to helpful exploded view diagrams and part ordering help here.
I recommend that you bookmark that link to your favorites.We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

If no results, ask them, they are a specialized search engine for microwave oven manuals.

what kind of motorhome is it if it has a inverter it may be kicking in and out due to low voltage or a bad cell in the batteries

First of all, thank you very much for choosing FIXYA today for your online technical support needs. I'm Joe, and I will be more than happy to assist you with your service request. Here is a direct link to the ONLINE USER'S MANUAL for a SHARP Over The Range Microwave model with the exact same controls and features as yours which should help you out:http://files.sharpusa.com/Downloads/ForHome/HomeAppliances/MicrowaveOvens/Manuals/mic_man_R1874.pdf To view the Owner's Manual with Operating Instructions just use your mouse to click on the link, which is the underlined and blue highlighted section of text just above. This will open a new web browser page automatically for you and allow you to view the information at the website indicated and the contents of the Owner's Manual. You may need ADOBE READER installed on your computer to read PDF documents, although many computers already have this utility pre-installed. You can always download this for free at WWW.ADOBE.COM if necessary. Click on the DOWNLOAD ADOBE READER button on right side of the ADOBE home page when you get there, then follow the onscreen instructions to install the software on your computer. Please COMMENT back here to this page if you have any details to add, have any questions, have difficulty accessing the links, or just require further general assistance and I will respond as soon as I see it. If you were satisfied with the service provided, could you please take a moment to leave a 5 STAR rating. Your feedback is very important and I truly appreciate your consideration. BEFORE leaving a rating OTHER THAN 5 STARS or a negative TESTIMONIAL, please contact me and I will immediately clear up any concerns or answer any additional questions that you might have until you are completely satisfied with the service provided. The FixYa rating system is a very important component of the Marketplace, and unfortunately once you post a rating or a testimonial to a solution, it cannot be changed at all later on. Be sure to use the small blue ADD A COMMENT button located just below the text of this solution to leave any additional comments for me regarding this particular issue and I will respond right away. Here also is a link to the SERVICE MANUAL for your microwave in case you ever need it:https://docs.google.com/viewer?a=v&q=cache:aViq1NLCf8EJ:031d26d.namesecurehost.com/mwd/r1850a_r1851a_r1852a_sm.pdf+&hl=en&pid=bl&srcid=ADGEESi-2_yOnl51kXvLpBX8W4WmMuOTSmAVzOHXgjp-vpfshyUoHIXTu2W1ii1m4Cnw0BT3zlzkxO5SE2WzXhj1h506lTLQx7JDhtZVBI0mnRxXZ-LvSi4mY71OD7LIROpNMKlLdTpq&sig=AHIEtbRsA2-KTmtPoCQUaRxv1B4MxFyhpg&pli=1 I truly hope that was helpful to you. Good luck and take care. Joe.