Question about Sharp R-1481B Microwave Oven

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R1481 no manual

We can't find the manual - no power, display, etc...power ok from outlet. We need a manual for dismounting, changing the fuse as suggested (where is it?) Can we find a manual to print on-line??

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We have the full service manual for this model and have uploaded it to our site here to help you.

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

You will need the
free Acrobat Reader to view or print it in case you don't have it already.

It may be the fuse, cavity thermal cutout, or magnetron thermal fuse.

It may also be a blown trace or bad low voltage transformer on the control panel.

We regularly repair such control units for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

If it needs the transformer, that would add
$25 to the repair cost.

The best place to order parts for this brand is Encompass (formerly Tritronics).

Or you can 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.

Posted on Jan 18, 2009

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  • Expert
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Check www.searspartsdirect.com for the model in question. I have found wiring diagrams, schematics and parts there.

Trace the wiring from the AC power cord from the hot side (black wire) and you should find a fuse holder. The fuse will be a white or beige ceramic cartridge instead of the glass style you may be used to looking for. The bad news is that when it blows, it usually means a shorted high voltage capacitor or diode or magnetron. The diode will not check like a silicone diode and usually tests open with a meter. I would replace the diode and capacitor as a set if the cap is shorted. If the magnetron tube is bad, chuck the oven and pop for a new one. Even if you can find a replacement, you can't certify the oven against microwave leakage once the tube is removed from the waveguide.

Posted on Oct 07, 2009

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There is no power going to my microwave. The fuse is ok


Have you tested your plug outlet with another appliance? If not it could be your wall plug.If this OK then contact a technician in the yellow pages.

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GE Microwave (Over the Range: Model HVM1540DPBB) was stopping operation. It would beep, and the display would show garbage. I would unplug it, then plug it into the outlet, then it would display "keypad...


make this test and fix it. God bless you


  1. Inspect the power cordUnplug the power cord and check for voltage at the outlet. Also inspect for damage, shorts, or burn marks that can be a possible safety hazard.
  2. Bad door switchIf your microwave does not work at all and you know everything is plugged in properly and the outlet is functioning, then also check the door hooks and the door release button. Using a volt-ohm meter on RX1, check your terminals. When your microwave door is closed you should have a reading of zero. Once the door is open the reading should change to infinity. If these readings do not match up, replacement of the door switch is necessary.
  3. Blown fusesTo determine if your fuse has blown out, which may attribute to your microwave not running, you need to pull the fuse out using a pair of fuse pullers. Lay it down and using a volt-ohm meter on RX1, check both ends of the fuse in question. If you do not get a reading of zero, then you will need to replace the fuse.
  4. Bad fan motorLocate the fan and remove the leads. Again using the volt-ohm meter on RX1, check the terminals. If an infinity reading is displayed, it means that the fan has gone bad and requires replacement.
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Nov 02, 2013 | GE Microwave Ovens

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721.89941490


follow this steps and fix it. God bless you

  1. Inspect the power cordUnplug the power cord and check for voltage at the outlet. Also inspect for damage, shorts, or burn marks that can be a possible safety hazard.
  2. Bad door switchIf your microwave does not work at all and you know everything is plugged in properly and the outlet is functioning, then also check the door hooks and the door release button. Using a volt-ohm meter on RX1, check your terminals. When your microwave door is closed you should have a reading of zero. Once the door is open the reading should change to infinity. If these readings do not match up, replacement of the door switch is necessary.
  3. Blown fusesTo determine if your fuse has blown out, which may attribute to your microwave not running, you need to pull the fuse out using a pair of fuse pullers. Lay it down and using a volt-ohm meter on RX1, check both ends of the fuse in question. If you do not get a reading of zero, then you will need to replace the fuse.
  4. Bad fan motorLocate the fan and remove the leads. Again using the volt-ohm meter on RX1, check the terminals. If an infinity reading is displayed, it means that the fan has gone bad and requires replacement.

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Jul 12, 2013 | Microwave Ovens

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Not a solution, just a safety measure. Please keep this unit unplugged until you find a solution for safety's sake. You didn't mention the brand, but some ovens have been starting on their own while the owner is away and causing an explosion and a house fire.

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Your unit is dead, mains are good, tried in other receptacles, still no power. You have a bad fuse inside the unit. Unplug. Remove the cover. Generally this requires removing all the screws on the back perimeter and lifting the cover up. Sometimes they stick due to old grease, etc. Somewhere in the area of where the power cord comes in or near the transformer there should be a small fuse in a holder. It is not a glass fuse and should be replaced with the same kind (ceramic) and value. This is important for future protection. You can get the fuse at www.mcmelectronics.com . Get a box of five for future problems. If this was the only problem your microwave should work. If it blows the new fuse you could have a shorted power transformer, bad high voltage diode, or a bad magnatron in that order. There could also be a short in the board with the display but that would be unusual. Let me know if you need anymore helpl

hardrocko

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If you don't see any light in the display or from the light bulb inside it you probably need to replace the fuse inside the microwave, it should be by the place where the cord goes in the microwave.

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Is the outlet ok? Can you plug somethng else into the outlet to see if the fuse or breaker controlling the outlet is ok? If there is power at the outlet, unplug the unit and remove the outside cover.
Look for a blown fuse on the motherboard. Replace it with the EXACT value of the original fuse. You can purchase a new fuse at Radio Shack or hardware store or auto parts store. Try powering up the unit again and see if it works now or whether the fuse blows again. If it blows again, the power supply may have been damaged. Was this a power outage or surge? Was anything else in your home affected?

- Jim

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