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Repair guides for the Quasar microwave oven, released in 1984 and identifiable by model number MQ7774XW.

Why doesn't heat food

my micro oven runs but doesn't make hot any food

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Seems like its got either a faulty magnetron or air blower. Its not worth repairing, best to get a new one.

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That could be a number of things. Check the troubleshooting guide. Looking at repairs to other microwaves might help

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Mohammad Zahidul Alam crwdns2934231:0crwdne2934231:0
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