Samsung CM1019 Service Manual page 25

Troubleshooting
6-1 Electrical Malfunction(continued)
SYMPTOM
Oven lamp goes off
Microwave output is low;.
Oven takes longer time
to cook food.
(No heat while oven lamp
and ventilation motor.)
Oven does not operate and
return to plugged-in mode.
Loud buzzing noise can
be heard.
Drive motor not
work. (Assy stirrer
does not rotate.)
Oven stops operating
during cooking.
Sparks
Uneven cooking
Noise from turntable motor
when it starts to operate.
Oven can program but
timer does not start.
24
CAUSE
1. Loose lead wire or open lamp
filament
2. Misadjustment of latch switch
3. Defective latch switch
1. Decrease in power source voltage.
2. Open or loose wiring of magnetron
filament circuit. (Intermittent oscillation)
3. Aging of magnetron
4. Defective high voltage components
H.V.Transformer
H.V.Capacitor
H.V.Diode,H.V.Fuse
Magnetron
Defective Ass'y PCB
1. Loose fan and Fan motor
2. Loose screws on H.V.Transformer
3. Shorted H.V.Diode
4. Loose or missing screws on
Cover-Back
1. Open or loose wiring of drive motor.
2. Defective drive motor.
3. Defective assÕy stirrer
1. Operation of thermal cutout
(Magnetron or Cavity)
2. Fan motor does not rotate.
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.
Defective circuitry of Start function
of Main PCB AssÕy.
Loose lead wires
CORRECTIONS
Tighten lamp lead wire or replace with
a new lamp
Consult electrician.
Check high voltage component
according to component test procedure
and replace if defective.
Replace AssÕy PCB.
Tighten screws of Fan motor.
Tighten screws of H.V.Transformer.
Replace H.V.Diode.
Tighten screws of Cover-Back
Check the wire of drive motor
Replace drive motor.
Replace assÕy stirrer.
Adjust door and latch switches.
Replace Fan motor.
Inform the customer of proper use.
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 circuitry of Start function
of Main PCB AssÕy and replace if
defective.
Adjust or repair loose wires.
Samsung Electronics