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Sharp R-9h91B microwave oven stopped working

My Sharp R-9h91b microwave oven stopped working. The LED panel does not light. I checked the fuse in the microwave and it seems OK. AC current comes into the plug in the back, but seems to stop before it gets to the fuse. Any idea of what to do now?

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If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work.

Posted on Sep 29, 2008

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Sharp Carousel Microwave Mdl 1875 for our RV is dead


>> We also tried plugging our toaster into the microwave plug outlet, and the toaster wouldn't work in that outlet, but worked just fine in a different outlet in the RV.

This means the outlet you plug your microwave into needs to be fixed in addition to fixing the oven. Breaker? Fuse?

>> I understand from another RV forum that microwave ovens for RVs have "special circuitry and cooling features" not found in regular countertop ovens for household use.

Not really in my experience. Any microwave supplied with clean AC power and proper venting space will be fine.

But I'd bet your microwave can be fixed affordably.

The main internal things which can result in this model being dead (no display, no light when you open the door, no beep when you press a pad on the keypad) would be the 20A fuse and the magnetron temperature fuse. There could also be bad connections on the noise filter board.

Also, sometimes a power surge can cause the power to be interrupted to the low voltage transformer on the board, and I regularly repair those boards. I can also write a technical statement to your insurance company or to an RV park as needed.

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

The relevant service manuals for this model are here and here.

You can order Sharp parts from Sears or Encompass.

Contact me directly if you need more help.

- William E. Miller, AS-EET
pupista@gmail.com
http://www.MicrowaveControl.com
Microwave Oven Control Panel Repair Nationwide "Recycling by repairing since 1982"

Mar 08, 2017 | Sharp R1875: Over the Range Convection...

7 Answers

My Sharp R-9h91b microwave oven stopped working. The LED panel does not light. I checked the fuse in the microwave and it seems OK. AC current comes into the plug in the back, but seems to stop before...


Lets start with


It doesn't work at all If your microwave oven doesn't seem to work at all, check these:

Fuses
Door switch
Fuses Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it.

Door switch If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work.

Sep 28, 2008 | Sharp Microwave Ovens

1 Answer

Microwave oven fuse blows


If your microwave oven is 7 years old or less, the too likely problems are the magnetron and the inverter board, if older check for a shorted high voltage capacitor and the high voltage diode, sometimes cracks and shorts.

Jun 13, 2012 | Sharp Microwave Ovens

2 Answers

My sharp microwave just stopped working. It


IT IS POSIBLE TO HAVE A BURNED FUSE ON THEI Main boARD OF THE OVEN

Feb 14, 2010 | Sharp R-1480 Microwave Oven

1 Answer

Sharp Microwave Lights Up, But Won't Rotate or Cook


Hi. I would suggest checking out the door switches. There are usually 3. If one of those has failed then the microwave won't operate because of safety reasons. Best to replace all three. If the display on the unit is still fully operational I'd say go for the repair.

Mar 18, 2009 | Sharp Microwave Ovens

1 Answer

My Sharp R-9h91b microwave oven stopped working


My solution is still visible here: http://www.fixya.com/support/t1083290-sharp_r_9h91b_microwave_oven

But it seems like the site is acting weird or something.

I don't have the other manual, but this repost of my answer covers it all:


Hi, I'm the guy who gave who the service manual link and the long, very detailed answer that covered just about everything that can make a microwave "dead".

You don't actually need the base service manual since this manual has everything you need to locate the parts and the part numbers, as well as the overall schematic.

The magnetron temperature fuse (ref # 1-7, original part # QFS-TA013WRE0) is located in section 3-D of the exploded view on page 25. Physically, it is clipped onto the waveguide above the magnetron and it looks like the right item in the attached drawing.

The oven thermal cutout (TCO) (ref # 1-8, original part # RTHM-A024WRE0) is located in section 2-H of the exploded view on page 25. Physically, it is located on the left side of the chassis near the convection fan assembly and it looks like the left item in the attached drawing.

The best place to order whichever of these you might need is parts is Tritronics. If the part numbers have changed, that will show up on their Web site.

The testing of these parts is simple continuity testing: With your meter on the ohms scale (and oven power unplugged of course) measure the resistance at the terminals of the thermal cutout (TCO). It should read virtually zero. If it reads high / infinity, then it's open and needs to be replaced.

You can also place a jumper or clip lead across the bad (or suspected) device and plug the oven in just long enough to see if it comes to life. Do not cook with the jumper in place, and unplug it right away, avoiding contact with any inside wires or connections.

The schematic on page 4 shows you the "order", if you will, in which the current flows. (Yes, I know it's AC). From the plug, it goes through the oven thermal cutout, then the magnetron temperatuere fuse, then the line fuse.

On that schematic, the very bold black lines show you the essential path required to get power to the board's low voltage transformer, which should result in a lit display assuming the boar dis okay.

If you need more help, please feel free to write me at prototech@usa.net.

If this is not a FixYa, I don't know what is! *grin*

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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Oct 01, 2008 | Microwave Ovens

2 Answers

Sharp R-1450 Microwave Oven


The most common suspect here is a shorted high voltage capacitor, since you say it blew the fuse right after Start, but I would certainly suggest checking the door switches and door switch mounts first. Just be sure you installed the right fuse. It would be a The switch mounts seem to break at about this point in the life of these models. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your model number here: http://www3.sears.com (the three is correct)

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