CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING
Contents
1. CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING Unlike many other appliances the microwave oven is high voltage high current equipment Though it is free from danger in ordinary use extreme care should be taken during repair CAUTION Servicemen should remove their watches whenever working close to or replacing the magnetron 1 Check the grounding Do not operate on a 2 wire extension cord The microwave oven is designed to be used when grounded It is imperative therefore to make sure it is grounded properly before beginning repair work 2 Warning about the electric charge in the high voltage capacitor For about 30 seconds after the oven is turned off an electric charge remains in the high voltage capacitor When replacing or checking parts remove the power plug from the outlet and short the terminal of the high voltage capacitor terminal of lead wire from diode to chassis ground with an insulated handle screwdriver to discharge WARNING There is high voltage present with high current capabilities in the circuits of the high voltage winding and filament winding of the high voltage transformer It is extremely dangerous to work on or near these circuits with oven energized DO NOT measure the voltage in the high voltage circuit including filament voltage of magnetron WARNING Never touch any circuit wiring with your hand nor with an insulated tool during operation 3 When parts must be replaced remove th2. ERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY IMPORTANT NOTICE The following components have potentials above 250V while the appliance is operated Magnetron High voltage transformer High voltage diode High voltage capacitor Pay special attention on these portions NYA aw oe AAN When the appliance is operated with the door hinge or magnetron fixed incorrectly the microwave leakage can reach more than 5mW cm After repair or exchange it is very important to check if magnetron and the door hinge is correctly fixed
3. e power plug from the outlet 4 When the 18 Amp fuse is blown due to the operation of short switch WARNING When the 18 Amp fuse is blown due to the operation of short switch you must replace Primary latch switch and short switch Also replace power relay B RY1 when the continuity check reads shorted contacts 1 2 A This is mandatory Refer to Adjustments and Measurement for these switches B When replacing the fuse confirm that it has the appropriate rating for these models C When replacing faulty switches be sure mounting tabs are not bent broken or otherwise deficient in their ability to hold the switches 5 Avoid inserting nails wire etc through any holes in the unit during operation Never insert a wire nail or any other metal object through the lamp holes on the cavity or any other holes or gaps because such objects may work as an antenna and cause microwave leakage 01 021 6 Confirm after repair A After repair or replacement of parts make sure that the screws of the oven etc are neither loose nor missing _ Microwaves might leak if screws are not properly tightened B Make sure that all electrical connections are tight before inserting the plug into the wall outlet C Check for microwave energy leakage Refer to procedure for measuring microwave energy leakage CAUTION MICROWAVE RADIATION DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GEN
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