![]() if the turntable motor sounds as though it’s struggling or grinding etc then by all means replace the motor or if the microwave has mechanical timers or switches that are becoming unpredictable in their operation then again look to fix them, but as to the purely electronic components, (resistors, capacitors, diodes etc) wait until they actually fail or start to cause a problem before looking to replace them. Mechanical components are a different story. Quasar microwave oven (Model MQ7750SW) Made by Quasar and is at least 35 yrs old. Publication date 1984 Topics Microwave cooking Publisher Franklin Park, IL : Quasar Co. The multimeter must be on the resistance setting or the diode check setting. Quasar microwave oven cookbook by Quasar Company. A multimeter can be used to measure the resistance of the diode. ![]() The diode is what attaches the capacitor to the back of the microwave. You could cause more problems than what you started with (if any) when trying to conduct preventative maintenance on electronic components. Products All Quasar rigid parts are available in a variety of Paint or Plating finishes, our standard finishes are Black Paint and Irridite Passivated for aluminium, for brass/ copper items the standard is painted black and no surface finish. If the microwave continues to spark after the interior has been cleaned, that could indicate that the diode may be broken. a bulging or leaking capacitor is an obvious problem but then you could have a faulty capacitor which shows no external indications of a problem at all, and to test them you’d have to remove them from the circuit board. Just because a component looks “old” or ”faded” doesn’t mean there is anything wrong with it, e.g. ![]() What criteria are you going to use to determine which components are “failing”? If there are definite problems with its’ operation that is a different matter. ![]() If there is nothing wrong with it, leave it alone. What is the model number of the microwave oven? ![]()
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