Question about Sharp R-1871 Convection Microwave Oven

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Fuse location screws

After convection cooking some apples I opened and closed the door before cooling fan finished running. 10 mins later, no power nor any display. outlet is good. ?? I see from schematic there is an inline power fuse and monitor fuse. Any suggestions ?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

red-pt
  • 2 Answers

SOURCE: Over the range microwave

I have the R-1460 in the same series with the identical symptoms. After reading MicrowaveSvc's solution I started taking apart to view the door switches and found the upper door switch to be the problem, but not a switch failure a support failure. A small bottom plastic support post that holds the switch in place was broken (probably from repeated use/abuse) allowing the switch to move when the door hooks were engaged, thus not actuating the button switch. Since the problem was mechanical rather than an electrical bad switch, I made a small support arm for the switch from an old plastic mechanical pencil and glued it in place to hold the switch in its correct position. Problem solved, microwave works! Thanks to MicrowaveSvc's description of door switches.

Posted on May 26, 2007

SOURCE: Sharp Carosel R-1481 (no B) & 950 Watts

All MW has a fuse inside to protect the circuit board
Try to replace the fuse

Posted on May 11, 2008

maklean
  • 1665 Answers

SOURCE: No Power

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.


http://www.repairclinic.com/0088_6_1.asp

Posted on Jul 05, 2008

  • 1 Answer

SOURCE: Using Convection Oven and lost power Sharp R-7A85

Replace fuse with slo blow from Ace Hardware. Plugged unit in, clock worked. Turned unit on and immediately blew new fuse. Will fix it with a new unit.

Posted on Mar 22, 2009

  • 71 Answers

SOURCE: Sharp Carousel Microwave has no power

I too believe that a "protection fuse" was possibly blown. It would need to be found and get replaced. Hopefully it is just a fuse and nothing else because the way it sounds to me, the microwave may be damaged.

Good Luck!

Posted on Jun 11, 2009

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RE: Samsung microwave SMH7187STG mfg'd 5/08. I heated cup of tea 2 min.Then I closed micro's door & micro emitted a continuous electrical buzzing sound.I opened door & buzzing stopped.


The cook relay on your control board is shorted, and the unit is cooking whenever you close the door.

When the magnetron overheats, its thermostat opens, shutting power down until the unit cools to a safe level, then power is restored.

I regularly repair these with my $54.95 service, which includes insured return shipping.

Details are here, or for full information and instructions, please e-mail me here at pupista@gmail.com and remind me of your full model number and symptoms.

Dec 20, 2016 | Samsung Microwave Ovens

Tip

Troubleshooting Guide


  • Problem: Totally dead oven.
    Possible causes:
    1. No power to outlet (blown fuse or tripped breaker or GFCI).
    2. Blown main fuse - likely due to other problems.
    3. Open thermal protector or thermal fuse.
    4. Defective controller or its power supply.
    5. Clock needs to be set before other functions will operate (some models).

  • Problem: Totally dead oven after repair.
    Possible causes:
    1. Cabinet screws replaced in incorrect location (safety interlock not engaged).
    2. Any number of screwups. :)

  • Problem: No response to any buttons on touchpad.
    Possible causes:
    1. Door is not closed (some models).
    2. You waited to long (open and close door to wake it up).
    3. Controller is confused (pull plug for a minute or two to reset).
    4. Defective interlock switches.
    5. Faulty controller or its power supply.
    6. Touchpad or controller board contaminated by overenthusiastic cleaning.
    7. Defective/damaged touchpad.

  • Problem: Oven runs when door is still open.
    Possible causes:
    1. Damaged interlock assembly.
    2. Cooling fans (only) running due to bad sensor or still warm.

  • Problem: Oven starts on its own as soon as door is closed.
    Possible causes:
    1. Defective triac or relay.
    2. Controller is confused (pull plug for a minute or two to reset).
    3. Defective controller or its power supply.
    4. Touchpad or controller board contaminated by overenthusiastic cleaning.
    5. Defective/damaged touchpad.

  • Problem: Oven works but display is blank.
    Possible causes:
    1. Defective controller or its power supply.
    2. Broken display panel.
    3. Oven needs to be reset (pull plug for a minute or two to reset).

  • Problem: Whacked out controller or incorrect operation.
    Possible causes:
    1. Previous or multipart cook cycle not complete.
    2. Controller is confused (pull plug for a minute or two to reset).
    3. Defective controller or its power supply.
    4. Touchpad or controller board contaminated by overenthusiastic cleaning.
    5. Defective/damaged touchpad.
    6. Defective sensor (particulalry covection/mirowave combos).

  • Problem: Erratic behavior.
    Possible causes:
    1. Previous or multipart cook cycle not complete.
    2. Bad connections in controller or microwave generator.
    3. Faulty relay - primary (or HV side, much less commonly used).
    4. Defective controller or its power supply.
    5. Bad contacts/connections on mechanical timers. Intermittent fuse.
    6. Power surge at start of cook cycle confusing controller.
    7. Microwave (RF) leakage into electronics bay.

  • Problem: Some keys on the touchpad do not function or perform the wrong action.
    Possible causes:
    1. Touchpad or controller board contaminated by overenthusiastic cleaning.
    2. Defective/damaged touchpad.
    3. Controller is confused (pull plug for a minute or two to reset).
    4. Faulty controller.

  • Problem: Microwave oven does not respond to START button.
    Possible causes:
    1. Defective START button.
    2. Faulty interlock switches.
    3. Door is not securely closed.
    4. Faulty controller.
    5. You waited too long - open and close door to wake it up!

  • Problem: No heat but otherwise normal operation.
    Possible causes:
    1. Blown fuse in HV transformer primary circuit or HV fuse (if used).
    2. Bad connections (particularly to magnetron filament).
    3. Open thermal protector or thermal fuse.
    4. Open HV capacitor, HV diode, HV transformer, or magnetron filament.
    5. Shorted HV diode, HV capacitor (will blow a fuse), or magnetron.
    6. Defective HV relay (not commonly used).

  • Problem: Timer and light work but no heat, cooling fan, or turntable rotation.
    Possible causes:
    1. Defective (lower) door interlock switch or door not closing fully.
    2. Faulty relay or triac.

  • Problem: Fuse blows when closing or opening door:
    Possible causes:
    1. Defective door interlock switch(s).
    2. Interlock switch knocked out of position.
    3. Misaligned door.

  • Problem: Loud hum and/or burning smell when attempting to cook.
    Possible causes:
    1. Shorted HV diode, magnetron.
    2. Burnt carbonized food in or above oven chamber.
    3. Shorted winding in HV transformer.
    4. Frayed insulation on HV wiring.

  • Problem: Arcing in or above oven chamber.
    Possible causes:
    1. Burnt carbonized food deposits.
    2. Exposed sharp metal edges.

  • Problem: Fuse blows when initiating cook cycle.
    Possible causes:
    1. Defective interlock switches or misaligned door.
    2. Shorted HV capacitor.
    3. Shorted HV diode.
    4. Shorted magnetron (probably won't blow main fuse but HV fuse if used).
    5. Defective triac.
    6. Old age or power surges.
    7. Defective HV transformer.
    8. Short in wiring due to vibration or poor manufacturing.

  • Problem: Fuse blows when microwave shuts off (during or at end of cook cycle).
    Possible causes:
    1. Defective triac (doesn't turn off properly).
    2. Defective relay.
    3. Shorting wires.

  • Problem: Oven heats on high setting regardless of power setting.
    Possible causes:
    1. Faulty primary relay or triac or HV relay (not commonly used).
    2. Faulty controller.

  • Problem: Oven immediately starts to cook when door is closed.
    Possible causes:
    1. Shorted relay or triac.
    2. Faulty controller.

  • Problem: Oven heats but power seems low or erratic.
    Possible causes:
    1. Low line voltage.
    2. Magnetron with low emission.
    3. Faulty controller or set for wrong mode.
    4. Stirrer (or turntable) not working.
    5. Intermittent connections to magnetron filament or elsewhere.
    6. Faulty primary relay or triac or HV relay (not commonly used).

  • Problem: Oven heats but shuts off randomly.
    Possible causes:
    1. Overheating due to blocked air vents or inoperative cooling fan.
    2. Overheating due to bad magnetron.
    3. Bad connections in controller or microwave generator.
    4. Faulty interlock switch or marginal door alignment.
    5. Faulty controller.
    6. Overheating due to extremely high line voltage.
    7. Stuck stirrer fan resulting hot spots detected by sensors.

  • Problem: Oven makes (possibly erratic) buzzing noise when heating.
    Possible causes:
    1. Fan blades hitting support or shroud.
    2. Vibrating sheet metal.
    3. Vibrating transformer laminations.
    4. Turntable or stirrer hitting some debris.

  • Problem: Oven light does not work.
    Possible causes:
    1. Burnt out bulb :-).
    2. Bad connections.

  • Problem: Fans or turntables that do not work.
    Possible causes:
    1. Gummed up lubrication or bad motor bearing(s).
    2. Loose or broken belt.
    3. Bad motor.
    4. Bad thermostat.
    5. Bad connections.

on Mar 30, 2008 | Kenmore 80412 Microwave Oven

1 Answer

How do I get my emerson microwave to turn off after the timer is finished?


There are a couple of microwave ovens out there where after it has finished cooking, the light and fan continue to run until you open the door. Then the fans shuts off, but the light remains on. When you close the door, then the light shuts off. If the light and fan go back on when you close the door, then you have a bad door switch.

Oct 20, 2014 | Emerson Microwave Ovens

1 Answer

Jenn-air micro convection - cooling fan comes on when door is opened, then goes off, intermintent problem


I have seen where one of the door switches becomes intermittent causing the symptoms you are describing, tough to nail down considering there are more than one door switches.

Jun 16, 2012 | Jenn-Air JMV9169B Convection/Microwave...

1 Answer

Mine is a similar problem - light and fan BOTH stay on when the cooking/heating finishes! The door remains closed and the food/beverage cooks. However, when it's finished the light remains on and the


There are a number of interlock switches that the oven door activates when closed, sometimes one becomes defective causing the main fuse to blow in the microwave or continue to run when time is up.

Nov 11, 2011 | Microwave Ovens

1 Answer

What is the cu ft, wattage, size, conventional oven yes or no, all the specs ect of the Kenmore mircorwave model #721.80833500


From the factory manual here:

SPECIFICATIONS
Rated Power Consumption ..............1700W maximum (Microwave oven+Cook top lamps+Ventilation fan)
Microwave Output ...........1100W (IEC60705)
Frequency ....2,450 MHz ±50 MHz
Power Supply .................120 VAC, 60 Hz
Rated Current ................14.5 Amp. (Microwave oven+Cook top lamps+Ventilation fan)
Magnetron Cooling .........Forced Air Cooling
Rectification .Rectification Voltage Double Half-Wave
Door Sealing ..................Choke System
Safety Devices ...............Magnetron Thermostat: Open at 145 °C ±5 °C
Close at 60 °C ±5 °C .....................Oven Thermostat: Open at 110 °C ±5 °C
Close at 0 °C ±5 °C ......................Fuse(20A)
Magnetron ......................2M282J (Toshiba)
Cook top Lamp ...............130 V, 35 W (Halogen)
Cavity Lamp ...................130 V, 35 W (Halogen)
Timer ..............................Digital,up to 99 min.(in each cooking stage)
Tray ..............Tempered Safety Glass
Overall Dimensions ........2915/16"(W)x167/16"(H)x153/8"(D)
Oven Cavity Size ...........231/2"(W)x10"(H)x141/2"(D)
Effective Capacity of Oven Cavity ....2.0 Cu.ft.
Accessories ..Owner 's Manual &Cooking Guide, Installation Manual,
Exhaust Adapter, Exhaust Damper, Mounting Kit and Filter,
Rotating Ring Assembly, Glass Tray, Metal Rack, Guide Tray.

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

Jul 09, 2011 | Kenmore 80809 Microwave Oven

1 Answer

Model jvm131h002 Stopped working. no power or


yes, at the back of the microwave there are 4 or 6 screws, take them out and then pull the cover follow the cable( the one you connect to the outlet) going to the inside of the microwave inside you will see the fuse change it with the same size, it is a slow burn fuse

Aug 04, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Need assistance with a ge profile repair microwave not working- newer appliance


Is it still under warranty? If so, take advantage of it. If you are on your own, does it have power (light comes ON when door opened)? Open the case, (power plug out) and look for a blown fuse. The fuse will pop when there is trouble in the HV system for the magnetron--usually a shorted HV diode or shorted stirrer fan bearing which is located within the waveguide that is located just over the cooking cavity. If the fuse is good, check the door interlock switch near the door latch mechanism. It may be a faulty micro-switch, loose switch, or damaged actuator.

Aug 03, 2009 | GE Advantium 120 Convection/Microwave Oven

1 Answer

Fan keeps running


Neither the owner's manual nor the quick start guide for this model addresses that specifically, but most commercial microwaves do work this way to ensure proper cooling.

The manual does state that when you open the door then close it, the light and fan will stay on for an unspecified period of time.

If the word "HOT" appears in the display, the magnetron is overheated and the fan will run until the temperature is brought down.

If the fan fan NEVER shuts off, then there may be a stuck relay or defective sensor.

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

Nov 06, 2008 | Microwave Ovens

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