Re: Sharp Microwave powers down after 40 seconds, need assistance

From: Sam Goldwasser (sam_at_saul.cis.upenn.edu)
Date: 01/07/05 

Date: 06 Jan 2005 23:30:28 -0500

"electroninja" <cnctutwiler@wmconnect.com> writes:

> Sharp Model R1810 Carousel II microwave starts and cooks(heats) but
> shutsdown after about 40 seconds. Electronic control board display
> stays lit, countdown stops and displays remaining time--magnetron
> cooling fan works during the first 40 seconds but then shutsoff--just
> before shutdown, fan speed increases(doubling or tripling in speed)
> These items seemed to check out good with VOM--
> power fuse
> interlock switches (2)
> monitor switch
> capacitor
> diode
> thermal cutout switch(only found one)
> fan motor
> power tranformer

Does it do the same thing if set to defrost so that the magnetron only
runs for a few seconds/30 seconds?

Can it be restarted immediately?

How is the behavior different than if the STOP button was presssed
(maybe aside from the fan speed)?

Isn't the fan simply on the AC line so how would its speed change?
Or, is it a multispeed fan?

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
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>
> Additional trouble shooting note--a power surge protector I had plugged
> the microwave into was discovered fried--suspect a near by lightning
> strike?
>
> Read an informative article by Sam Goldwasser-- "NOTES ON MICROWAVE
> OVEN FAILURE DIAGNOSIS AND REPAIR v1.01" but need more help. Thanks

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