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KJINTF 10-14-2011 04:05 PM

Sharp R-308JW Microwave
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Hi all.

I am looking for a service manual for my dead microwave
It started making a humming noise and no heat
Hoping someone with experience with these machines can help me out
It has a RV-MZA321 magnitron
Yes I understand it is a cheap machine but I sure would like to keep it functional and not spend another few hundred $$$$


hardwareman 10-14-2011 07:52 PM

your probably not going to find a sharp manual, but microwaves are all the same the way they operate and are fairly simple to troubleshoot, just do a search for micro wave repair. Just remember to do all your test with the micro unplugged and the capacitor discharged, I can not stress that point enough.

KJINTF 10-15-2011 08:08 AM

Safety is always number #1 when working on these things unless you liek to be shocked or radiated with 2.4gig RF radiation
I remember working on the old CRT TV"s wow they would hold a charge for some time and that 30KV hot lead hurt when you go to near
Looks as if the 5 year parts warranty expired a few months ago and magnetron has failed
Found parts on line $29.95 for a used one and $79.95 for a new part
Even better $99.95 for a completely new other than Sharp unit - off to the dump today to toss this POC

KJINTF 10-15-2011 01:57 PM

After a somewhat closer inspection I find the HV diode to be shorted
It's a ESJC13-09b 9Kv 450ma diode
Looking at parts on line WOW what a ripoff
I do not need the red wire or the crimped on ends nor do I need the $25.oo price tag for a Two dollar part
Any one know where I can find the simple HV diode alone part # ESJS13-09b


hardwareman 10-15-2011 06:12 PM

call an appliance parts house and ask them to cross it to a QBP part, maybe 9.00

KJINTF 10-16-2011 08:00 AM

I got one from an electronics dealer $2.58 plus no tax in Montana
Less than three dollars plus my time and we are back in business

suby4me 04-03-2014 09:11 PM

ESJC13-09b is also crossed to NTE517 Diode
cost at a local parts house $6.68

suby4me 04-03-2014 09:13 PM

ESJC13-09b is crossed to a NTE517 Diode cost $6.68 local electronics parts house

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