Question about Sharp R-1490 Microwave Oven

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Microwave has power but makes grumbling noise and not heating

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Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Basic Microwave Oven TroubleshootingTips

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Posted on Mar 27, 2011

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  • 2 Answers

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Posted on Jan 02, 2017

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Mu accuwaave makes a short noise intermittenly while trying to heat


Hi,

Is your microwave oven set to full power when the intermittent noise occurs?

If it's set to a lower power rating, then the noise you describe sounds perfectly normal.
At a lower power setting, the device which creates the heat or microwaves, called the magnetron, switches on and off intermittently so that the food etc. is not cooked too fast.
This is quite normal & you should only be concerned if the noise occurs while the microwave oven is set to full power.
In that case you will have to have it checked out to see what the cause is.

Best wishes,
Graemevm

Mar 24, 2011 | Whirlpool Accuwave Microwave Oven

Tip

Micorwave ovens - and where's the heat?


A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION.

on Feb 04, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Turns on but no heat. ? is there a fuse we can replace and where is it?


A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION

Jan 16, 2011 | GE JVM3670 Microwave Oven

1 Answer

It made a loud pop while heating. Now everything works but the microwave does not heat. What is wrong and how can it be fixed?


A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION

Jan 16, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Stopped working normally, makes low grumbling noise


have a look at the glass plate rollers first if there sticky free them off, but if the noise is from the inside of the microwave its likley to be a short in the mains coil witch case dont even think of fixing it
it would be far cheeper to buy a new microwave insted
a word of warning,,, dont think you can fine an easy fix for it, if its an internal fult, and dont go tinkering inside of it, there is very high voltage inside this microwave it can kill you if you tuch the wrong part have ever seen a police stun gun working???????
it realy hurts you,,,
your microwave has the stun guns very big brother inside of it,, it dont stun,, it kills!!!!
best to plat it safe dump it and buy a new one
there only about £50 today
so is your life worth more than £50???????/

Oct 27, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Chefmate microwave will not heat up anything


A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION.

Feb 04, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave, model # jes738wj02


It's normal for it to rotate in either direction. It has to do with the position of the motor and the instantaneous line polarity at the time the power is engaged.

But the grinding noise may indicate a problem...

You can do a quick check. You can see and hear a video of how a turntable motor should sound when you rotate it by hand: http://www.youtube.com/watch?v=rPSWi_z7M58

If yours sounds like it's grinding, etc., you may have a bad motor.

To replace it, you need to unplug power, then remove the bottom cover of the oven.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

We're happy to help and we appreciate your thoughtful rating of our answer.

May 14, 2008 | Microwave Ovens

1 Answer

The turn table goes clockwise sometimes & counter clockwise sometimes.It also makes a groumbling noise.


The motor for the turntable in these ovens is bi-directional. This is normal.

As for the noise, it is very common that the main turntable wheel track-ring under it is dirty at its wheels, or its pin-pushings have some wear. It is also posssible that the main turntable motor has become noisy from use and age.

I have had microwave ovens make a grumbly sound when one of the cooling fans are going defective.


Jerry G.



May 14, 2008 | GE Microwave Ovens

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