Samsung CO88R Service Manual page 27

Troubleshooting
7-4 Electrical Malfunction(continued)
SYMPTOM
Oven can program but timer
does not start.
Microwave output is low;.
Oven takes longer time to
cook food.
Oven does not operate and return
to the plugged in mode.
Loud buzzing noise can be heard.
Turntable motor does not rotate.
Fan motor does not rotate
Oven stops operation during cooking
Sparks
Uneven cooking
Noise from the turntable motor
when it starts to operate.
Poor defrosting
7-6
CAUSE
1. Open or loose wiring of primary
interlock switch
2. Off-alignment of primary interlock
3. Defective primary interlock S/W
1. Decrease in power source voltage.
2. Open or loose wiring of magnetron
filament circuit. (Intermittent oscillation))
3. Aging of magnetron
Defective Ass'y PCB
1. Loose fan and fan motor
2. Loose screws on H.V.Transformer
3. Shorted H.V.Diode
1. Open or loose wiring of turntable motor.
2. Defective turntable motor.
1. Defective fan motor
2. Defective fan motor or ass'y PCB
1. Open or loose wiring of primary
interlock switch
2. Operation of thermal cutout(Magnetron)
1. Metallic ware or cooking dishes
touching on the oven wall.
2. Ceramic ware trimmed with gold or
silver powder also causes sparks.
Uneven intensity of microwave due to
its characteristics.
Noise may result from the motor.
1. Open or loose wiring of weight sensor
2. Point not adjusted
CORRECTIONS
Adjust door and interlock switches.
Consult electrician.
Replace PCB main.
Tighten screws of fan motor.
Tighten screws of H.V.Transformer.
Replace H.V.Diode.
Check the wire of turntable motor.
Replace turntable motor.
Replace fan motor
Replace PCB main
Adjust door and latch switches.
Inform the customer.
Do not use any type of cookware with
metallic trimming.
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.
Replace turntable motor.
Check the connections to weight
sensor
Readjust the "0" point
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