Question about Refrigerators
National oven nn c781jf
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Posted on Jan 02, 2017
Our technician suggest that there may be a problem with the Inverter Board in this model, which is something that would need to be looked at by a Service Center.
In rare cases it could be the door switches.
Posted on Mar 27, 2009
Test the high voltage capacitor,
the rectifier diode.or the magnetron.
The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.
All locations, and description of this parts can be located using the diagram here: Counter top.
Parts must be tested to find out what is wrong.
Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.
Regarding parts, contact the seller here to purchase parts.
Posted on May 21, 2009
Does the oven display the time on the LCD display? if yes there cud be a problem with the switch pad or any one of the micro switches or safety switches that are placed inside the oven. If u do not understand the functioning of microwave ovens please do not attempt tp open it urself as it is dangerous to do so without knowledge. Capacitors inside may hold charge of upto 2000 volts
Posted on Jul 01, 2009
Think about calling up the Sears 800-4MY-HOME line... the parts dept can look up your model with the LIS and have the part sent to your address and a Tech to install it for you if you don't know how, plus if you do pay for a tech repair for like $40 they do a clean and prevenative maitnence check on any other appliance you may have thats acting weird.
Posted on Mar 07, 2012
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