Question about Microwave Ovens

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I have owned as many as 6 Sharp convection Microwaves, they have all suffered the same fate. The timer when in convection stops at approx 5min in this time it has not heated hot enough and each time is reset it will work again for another 5min. If on duel power it stops on convection but works on microwave. It cost about $80 plus to repair depending on who you take it to. I have 4 units with this problem at this moment. My Sons, sisters a rental as well as mine. Can you help identify the part that causes the problem. Can you inform Sharp as I beleive they should have attended to this issue but the same moduel is in different models. Yours Sincerely Terry Dowsett

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"Convection cycle runs 4 minutes and 15 seconds then shuts down."

In most cases, this is a bad thermistor, but it may also be loose wiring, or a problem on the control panel.

The thermistor should be on the top of the chassis and it will look like one of the attached drawings.

You will have to remove the outer cover of the oven to get to it.

THERMISTOR TEST

Room Temperature 68°F(20°C) - 86°F(30°C)

Resistance Approx. 350k ohms - 155k ohms

(The higher the room temperature, the lower the resistance, and vice-versa).

If the meter does not indicate above resistance, replace the thermistor.

Also, if the thermistor is caked with grease, or it's rusty, it will need to be replaced.

If it has a broken lead, it cannot be repaired unless you spot weld orbraze it, and if you get it too hot, it will be destroyed.

To find the thermistors, you can visit Sharp'sAustralian support siteand click on the "Spareparts Outlets" link under "Frequented Resources".

(If you're not in Australia, please write back and let me know where you are!)

We'rehappy to help you with free advice and we'd appreciate yourthoughtful rating of our answer.

I have owned as many - ef18c71.jpg

Posted on Dec 15, 2008

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I have R-9X58 timer that stopa @ 5min when in convection mode


"Convection cycle runs 4 minutes and 15 seconds then shuts down."

In most cases, this is a bad thermistor, but it may also be loose wiring, or a problem on the control panel.

The thermistor should be on the top of the chassis and it will look like one of the attached drawings.

You will have to remove the outer cover of the oven to get to it.

THERMISTOR TEST

Room Temperature 68°F(20°C) - 86°F(30°C)

Resistance Approx. 350k ohms - 155k ohms

(The higher the room temperature, the lower the resistance, and vice-versa).

If the meter does not indicate above resistance, replace the thermistor.

Also, if the thermistor is caked with grease, or it's rusty, it will need to be replaced.

If it has a broken lead, it cannot be repaired unless you spot weld or braze it, and if you get it too hot, it will be destroyed.

To find the thermistors, you can visit Sharp's Australian support site and click on the "Spareparts Outlets" link under "Frequented Resources".

(If you're not in Australia, please write back and let me know where you are!)

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

ef18c71.jpg

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1 Answer

Sharp mdl R-1870 convection microwave runs for 1 min


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The damper is a door inside that opens or closes depending on cooking mode. If the controller senses that the door is not in the right position, it will shut down the cook cycle.

Sharp models stop after 59 seconds.

See the attached sample photo.

We have the service manual and have uploaded it to our site:
http://www.microwavedisplay.com/r1870_r1871_sm.pdf

You can order Sharp parts from Tritronics at http://www.wehaveparts.com

529d312.jpg

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