Question about Sharp R-963 Convection/Microwave Oven

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Sharp R-9H66C Microwave Convection blowing fuses

This unit blew the 20Amp fuse.  Rrplaced fuse.  Convection runs fine but as soon as microwave is selected and Start pressed. it blows again.  Any suggestions?

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  • DianaC Oct 30, 2007

    Can you provide guidance on how to test the magnetron?

    Does this unit actually have diodes?




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Check high voltage transformer and high voltage diodes, condencer, and magnetron.,

Posted on Oct 28, 2007


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2 Answers

What causes microwave to blow new fuse?

The only thing inside a microwave oven that draws enough current to blow a fuse is the magnetron that generates the microwaves to provide the cooking power. Based on the age of the unit (approx 15 years) it is most likely best to just replace it as repairs at that level are not cost effective. Newer units cook better and faster using less power these days.

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GE Advantium 120 SCA1000DWW03 blowing 20amp fuse

Our unit was doing the same thing,
took it into the repair shop, they said there was nothing wrong with the unit, replace the main breaker that supplies power to microwave and try again.
Sure enough the breaker became defective, and we never had issues with it before, but now the unit has not had a single problem.

Feb 13, 2014 | GE Advantium SCA1000H Convection /...

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Microwave blows fuse in microwave mode grill function ok

It is most likely the capacitor has shorted or the rectifier has shorted. Check with ohmeter, but make sure it is discharged first by shorting the capacitor with a wire.

May 21, 2010 | GE Advantium 120 Convection/Microwave Oven

1 Answer

Sharp microwave stopped working

Is it totally dead? No display? Or just does not cook? If it made an unusual noise before it 'died' something probably shorted out.... You need an ohm meter to troubleshoot. If the fuse is open, switches and HV circuit need to be checked before replacing fuse. Sometimes on the convection Microwaves (not just Sharp) the fuse will 'rust' and open rather than blow. Or the fuse holder can over heat and fail.

Sep 11, 2009 | Sharp Microwave Ovens

1 Answer

I believe mine blew a fuse as well

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.
many people have been electrocuted with an unplugged microwave due to the enormous residual charge inside.

you can now get a new microwave at walmart for fifty bucks..........why monkey with a ten year old unit.

Aug 17, 2009 | Sharp R-963 Convection/Microwave Oven

1 Answer

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.

Mar 21, 2009 | Sharp R-7A85 Microwave Oven

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Sharp Model 1451 blown power fuse

1.Problem with monitor door switch or
2. Problem with high voltage condenser.

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Fuse keeps blowing.

couple questions -
what else is on the circuit,
and what current does the oven need

there are whirlpool over-range models with
1200watts of microwave,
1500watts of convection power, a
60watt bulb and a
375watt fan

over 15amps -20amp circuit needed

if you inadvertantly replaced a higher current fuse with a 15amp fuse, it will blow every time.
the install guide reccommends 20amp
not a solution, something to check,

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