I have a quasar MQ7744XW. I used it regularly for many years. One day , I closed door, pushed start,heard rattling noise, oven went dark. I checked circuit breaker. It was not tripped. Oven remains unresponsive. Dark. No panel button response, no internal or external lights (two lights on casing). Fan does not work. Can It be as simple as fuse? Is an equivalent fuse available?
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Hi @mariocavada ,
It could be a fuse but then you would have to find out why it blew. Fuses do not blow for no reason. You could replace the fuse only to find that it blows again the next time the oven was tried to be used. The fuse rating should be stamped on the end caps of the fuse i.e. volts (V) and amps (A)
Hopefully there is a wiring diagram for the oven inside the oven so that it is easier to work out why the fuse may have blown it if has.
If not it will be more difficult and time consuming to find out why it failed as you would have to do individual testing of the major components.
Here’s the ifixit Quasar Microwave Oven MQ7774XW Repair guide and also a link that in general describes how to test microwave ovens that may help. If you do find a faulty component it may be difficult to find a compatible replacement spare part due to the age of the oven. Searching online for your model number gives no results for parts, manuals etc, you may have better luck in finding them.
Working on microwave ovens is extremely dangerous. The HV capacitor can store >6000V DC even if the oven has been disconnected from the power for some time. This amount of voltage can seriously injure you. The HV capacitor needs to be correctly discharged as soon as it is accessible after the oven’s cover has been removed and before any further work is done inside the oven. If you don’t know what you’re doing then don’t do it! It’s not worth it, leave it to the experts.
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