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4. Troubleshooting
Timer starts countdown but no microwave oscillation.
(No heat while oven lamp and fan motor turn on.)
NOTE:
Large contact resistance will bring lower magnetron filament voltage and cause magnetron
to lower output and/or intermittent oscillation.
Timer starts
countdown but
no microwave
oscillation
Off-alignment of latch switches
Open or loose connection of high
voltage circuit especially magnetron
filament circuit
(NOTE)
Defective high voltage components
H.V.Transformer H.V. Capacitor
H.V.Diode, H.V.Fuse Magnetron
Adjust door and latch switches.
Check high voltage component according to
component test procedure and replace if it is
defective.
Open or loose wiring of power relay
Replace PCB main.
Defective primary latch switch
Defective power relay or Ass’y PCB
Oven can program but timer does not start.
Oven can program
but timer does
not start
Open or loose wiring of secondary
interlock switch
Adjust door and interlock switches.
Off-alignment of primary interlock
Defective secondary interlock S/W
Microwave output is low. (Oven takes longer time to cook food.)
Microwave
output is low
Decrease in power source voltage
Consult electrician.
Open or loose wiring of magnetron
filament circuit.
(Intermittent oscillation)
Aging of magnetron
Fan motor turns on when plugged in.
Fan motor turns
on when plugged in
Loose wiring of door sensing switch
Consult electrician.
Oven does not operate and return to the plugged in mode.
Oven does not
operate and return to
the plugged
in mode
Defective Ass’y PCB
Replace PCB main.
