It had an intermittent operation would work one day stop heating the next. I have had a look at the magnetron and it has a very common 2M214 type model RV-MZ-A074-wreo imprinted on it should I open the magnetron casing or am I chasing the wrong fault pl help
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If there is no heat it is the Magnetron. The other 1 from the 9/10 is the HV (High Voltage) Diode that connects to the HV Capacitor.This is the cheaper fix of the two with them being usually under $12. The Magnetron is rather high ranging from approx. $50 and up.Have the blown parts replaced.Thanks
If the operation is otherwise normal with the exception of heating food, common causes include; (to diagnose requires discharging of the HV capacitor) if you are inexperienced with working with HV I suggest seeking professional help.
Open thermal protectors or thermal fuses.
Open HV Diode.
Open HV capacitor
Open magnetron filament
Open winding in HV transformer
Defective HV relay
Shorted HV diode
Short or other fault in the magnetron
Short in certain portions of the HV wiring
Replacement Magnetrons (the most likely cause if not charring or defective components are found when troublshooting the small parts, can typically be had for around $45.00 just do a web search for your model number.
Intermittent operation can be caused by a door interlock micro switch, a weak capacitor, an intermittent wiring connection from heat or poor connection, a marginally performing diode or a sticking Magnetron. Except for the Magnetron all other repairs would be worth the expense.
Repair costs and parts for most everything else will be between $65 and $100.00 depending on the part(s) replaced. Replacing the Magnetron would cost more than 50 % of the total unit replacement cost.
9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.Q - My microwave is running and sounds like it is working but will not heat up anything. A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....
Q - The microwave display counts down and the inside light is on, but nothing is heating and the fan is not running. A - This most commonly is abad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common. thanks.
If the supply voltage is low it will take long time to heat foods. The second reason is the Magnetron. Since it is in the warranty period you can call at the sharp authorised service center. They will do it free of coast.