Samsung CM1319 Service Manual page 27

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)
Oven does not operate and
return to the plugged in mode.
Loud buzzing noise can be
heard.
Drive motor not work.
(Ass'y stirrer does not
rotate.)
Oven stops operation during
cooking
Sparks
Uneven cooking
Noise from the turntable
motor when it starts to
operate.
Oven can program but
timer does not start.
CAUSE
1. Loose lead wire or open lamp
filament
1. Misadjustment of latch switch
2. Defective primary 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 turntable motor.
2. Defective turntable motor.
3. Defective ass'y 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 P.C.B Ass'y.
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 PCB main.
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 ass'y 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 P.C.B Ass'y and replace if
defective.
Adjust or repair loose wires.