Samsung Electronics
6-2
Troubleshooting
SYMPTOM
CAUSE
CORRECTIONS
Oven lamp and fan motor turn on
1. Misadjustment or loose wiring
Adjust door and latch switches.
of primary latch switch
2. Defective primary latch switch
Oven can program but timer
1. Open or loose wiring of secondary
Adjust door and interlock switches.
does not start.
interlock switch
2. Off-alignment of primary interlock
3. Defective secondary interlock S/W
Microwave output is low;.
1. Decrease in power source voltage.
Consult electrician.
Oven takes longer time to
2. Open or loose wiring of magnetron
cook food.
filament circuit. (Intermittent oscillation))
3. Aging of magnetron
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
Defective Ass'y PCB
Replace PCB main.
to the plugged in mode.
Loud buzzing noise can be heard.
1. Loose fan and fan motor
Tighten screws of fan motor.
2. Loose screws on H.V.Transformer
Tighten screws of H.V.Transformer.
3. Shorted H.V.Diode
Replace H.V.Diode.
Turntable motor does not rotate.
1. Open or loose wiring of turntable motor.
Replace turntable motor.
2. Defective turntable motor.
Oven stops operation during cooking
1. Open or loose wiring of primary
Adjust door and latch switches.
interlock switch
2. Operation of thermal cutout(Magnetron)
Sparks
1. Metallic ware or cooking dishes
Inform the customer.
touching on the oven wall.
2. Ceramic ware trimmed with gold or
Do not use any type of cookware with
silver powder also causes sparks.
metallic trimming.
Uneven cooking
Uneven intensity of microwave due to
Wrap thinner parts of the food with
its characteristics.
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
Noise may result from the motor.
Replace turntable motor.
when it starts to operate.
6-1 Electrical Maltunction(continved)
6-3 Gas Sensor
SENSOR
HEATER
LEADS
RECEPTACLE
SENSOR
RETAINER
LEADS
TUBING
DOOR
AUTO COOK (SENSOR ONLY)
The Auto Cook function uses a special gas sensor which detects
both humidity (steam) and hydrocarbons (food odors) during the
cooking process.
The sensor is a plug-in device located on the left side of the
cavity at the cavity exhaust.
AUTO COOK TEST (SENSOR ONLY)
1. Place 1/3 cup tap water in oven.
2. Touch POPCORN
3. After 1-2 mins: Control Beeps & Display counts down.
4. Touch CLEAR OFF.
A) Test OK-Normal
B) Test Fails-Check Sensor (See Sensor Test)
SENSOR TEST(QUICK TEST) (SENSOR ONLY)
1. With 2-fingers touch and hold the following pads at the same time : 7
and 8
2. Observe diagnostic number in display(numbers approximate)
* 15-185(Normal-verify with "detection test")
* 185 or Higher(sensor failed open. sensor unplugged,
wiring, or smart board)
* Less than 15 (shorted sensor, or smart board)
NOTE
: Only heater terminals (H) can be checked with ohmmeter (30½)
CAUTION
: DO NOT ATTEMPT TO CHECK
SENSOR TERMINALS(CAN DAMAGE SENSOR).
