- 14 -
SYMPTOM
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 oscil-
lation)
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
aluminum 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 motor
when it starts to operate.
Noise may result from the motor.
Replace turntable motor.
6-1 Electrical Malfunction(continued)
