Panasonic NN-H264SFR Service Manual

Also see for Inverter NN-H275: Operating instructions Operating instructions Service manual

SYMPTOM CAUSE CORRECTIONS5. Timer starts count down butno microwave oscillation.(No heat while oven lampand fan motor turn on)1.2.Off-alignment of latch switchesOpen or loose connection of highvoltage circuit especially magnetronfilament circuitNOTE:Large contact resistance will bringlower magnetron filament voltageand causing magnetron to loweroutput and/or be intermittent.Adjust door and latch switches3. Defective high voltage componentH.V. Inverter Power Supply (u)MagnetronCheck high voltage componentaccording to component testprocedure and replace if it isdefective.4. Open or loose wiring of power relayB (RY-1)5. Defective primary latch switch6. Defective DPC or power relay B (RY-1)Refer to DPC troubleshooting6. Oven can program but timerdoes not start countdown.1. Open or loose wiring of secondarylatch switch2. Off-alignment of secondary latchswitchAdjust door and latch switches3. Defective secondary latch switch7. Microwave output is low.Oven takes longer time tocook food.1. Decrease in power source voltage Consult electrician2. Open or loose wiring of magnetronfilament circuit.(Intermittentoscillation)3. Aging change of magnetron8. Fan motor turns on andturntable rotates when dooris opened.1. Shorted primary latch switch9. Oven does not operate andreturn to plugged in modeas soon as start pad ispressed.1. Defective DPC Check tighten screws onescutcheon base bracket, D.P.Cboard.10.Loud buzzing noise can beheard.1. Loose fan and fan motor11.Turntable motor does notrotate.1. Open or loose wiring of turntablemotor2. Defective turntable motor12.Oven stops operation duringcooking.1. Open or loose wiring of primary andsecondary latch switchAdjust door and latch switches2. Operation of thermal cutout13.Oven returns to plugged inmode after 18 secondselapses on the Auto sensorcooking mode.1. Open or loose wiring of sensorterminal from DPC2. Open steam sensor3. Defective DPC36