Question about Sharp R-1870 Convection/Microwave Oven
I have R-9X58 microwave that stops @ 5min when in convection mode. It stops heating from the 1.5kw element before it gets hot enough, if you reset it stops at the same point again. Between my son, sister rentals and self we have 4 Sharps doing the exact same thing The timer seems to be the same type used in all of them. I would like to have a go at the repair as I have had 6 Sharp microwaves myself that all had done the same thing. Also the display is quiet dim but this is minor as we need convection oven first. Sharp needs to be made aware of issue as service cost varies greatly. Please help sincerely, Terry Dowsett firstname.lastname@example.org
"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.
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.
Posted on Dec 15, 2008
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