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6-1 Electrical Malfunction(continued)
SYMPTOMS
CAUSE
CORRECTIONS
Oven lamp and fan motor turn
on.
1. Misadjustment or loose wiring
of primary latch switch
2. Defective primary latch switch
Adjust door and latch switches.
Oven can program but timer
does not start.
1. Open or loose wiring of
secondary interlock switch
2. Off-alignment of primary
interlock
3. Defective secondary interlock
S/W
Adjust door and interlock switches.
Microwave output is low;.
Oven takes longer time to
cook food.
1. Decrease in power source
voltage.
2. Open or loose wiring of
magnetron filament circuit.
(Intermittent oscillation))
3. Aging of magnetron
Consult electrician.
Fan motor turns on when
plugged in
Loose wiring of door sensing
switch
Check wire of door sensing switch.
Oven does not operate and
return to the plugged in mode
Defective Ass’y PCB
Replace PCB main.
Loud buzzing noise can be
heard.
1. Loose fan and fan motor
2. Loose screws on
H.V.Transformer
3. Shorted H.V.Diode
Tighten screws of fan motor.
Tighten screws of H.V.Transformer.
Replace H.V.Diode
Turntable motor does not
rotate.
1. Open or loose wiring of
turntable motor.
2. Defective turntable motor.
Replace turntable motor.
Oven stops operation during
cooking
1. Open or loose wiring of primary
interlock switch
2. Operation of thermal
cutout(Magnetron)
Adjust door and latch switches.
Sparks
1. Metallic ware or cooking dishes
touching on the oven wall.
2. Ceramic ware trimmed with
gold or silver powder also
causes sparks.
Inform the customer.
Do not use any type of cookware with
metallic trimming.
Uneven cooking
Uneven intensity of microwave
due to
its characteristics.
Wrap thinner parts of the food with alumi-
num foil.
Use plastic wrap or cover with a lid.
Stir once or twice while cooking foods
such as soup, cocoa, or milk.
Noise from the turntable mo-
tor when it starts to operate.
Noise may result from the motor.
Replace turntable motor.
