SAMSUNG PG-832R Service Manual Troubleshooting

6. Troubleshooting

PRECAUTION

1. CHECK GROUNDING BEFORE CHECKING FOR TROUBLE.

2. BE CAREFUL OF THE HIGH VOLTAGE CIRCUIT.

3. DISCHARGE THE HIGH VOLTAGE CAPACITOR.

4. WHEN CHECKING THE CONTINUITY OF THE SWITCHES OR TRANSFORMER, DISCONNECT ONE LEAD WIRE FROM THESE PARTS AND THEN CHECK CONTINUITY WITHOUT THE POWER SOURCE ON. TO DO OTHERWISE MAY RESULT IN A FALSE READING OR DAMAGE TO YOUR METER.

5. DO NOT TOUCH ANY PART OF THE CIRCUIT OR THE CONTROL CIRCUIT BOARD, SINCE STATIC DISCHARGE MAY DAMAGE IT. ALWAYS TOUCH GROUND WHILE WORKING ON IT TO DISCHARGE ANY STATIC CHARGE

BUILT UP.

6-1 Electrical Malfunction

SYMPTOM CAUSE CORRECTIONS

Oven is dead. Fuse is OK. No display and no operation at all.

No display and no operation at all. Fuse is blown.

Oven does not accept

key input (Program)

Timer starts countdown but no microwave oscillation. (No heat while oven lamp and fan motor turn on.)

1. Open or loose lead wire harness

2. Open thermal cutout (Magnetron)

3. Open low voltage transformer

4. Defective Ass'y PCB

1. Shorted lead wire harness

2.Defectiveprimarylatchswitch (NOTE 1)

3. Defective monitor switch (NOTE1)

4. Shorted H.V.Capacitor

5. Shorted H.V.Transformer (NOTE2)

NOTE 1: All of these switches must be replaced at the same time.

(refer to adjustment instructions) Check continuity of power relay contacts and if it has continuity, replace power relay also.

NOTE 2: When H.V.Transformer is replaced, check diode and

magnetron also.

1. Key input is not in-Sequence

2. Open or loose connection of membrane key pad to Ass'y PCB

3. Shorted or open membrane panel

4. Defective Ass'y PCB

1. Off-alignment of latch switches

2. Open or loose connection of high voltage circuit especially magnetron filament circuit

NOTE: Large contact resistance will

bring lower magnetron filament voltage and cause magnetron to lower output and/or intermittent oscillation.

3. Defective high voltage components H.V.Transformer H.V. Capacitor H.V.Diode, H.V.Fuse Magnetron

4. Open or loose wiring of power relay

5.Defectiveprimarylatchswitch

6. Defective power relay or Ass'y PCB

Check fan motor when thermal cutout is defective. Check Ass'y PCB when L.V.T is defective.

Check adjustment of primary, interlock monitor, power relay, door sensing switch.

Refer to operation procedure.

Replace PCB main. Adjust door and latch switches.

Check high voltage component according to component test procedure and replace if it is defective.

Replace PCB main.

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6-1 Electrical Malfunction(continued)

SYMPTOM CAUSE CORRECTIONS

Oven lamp and fan motor turn on 1. Misadjustment or loose wiring

of primary latch switch

2.Defectiveprimarylatchswitch

Oven can program but timer does not start.

Microwave output is low;. Oven takes longer time to cook food.

Fan motor turns on when plugged in Loose wiring of door sensing switch

Oven does not operate and return to the plugged in mode.

Loud buzzing noise can be heard. 1. Loose fan and fan motor

Turntable motor does not rotate. 1. Open or loose wiring of

Oven stops operation during cooking

Sparks 1. Metallic ware or cooking dishes

Uneven cooking

Noise from the turntable motor when it starts to operate.

1. Open or loose wiring of secondary interlock switch

2. Off-alignment of primary interlock

Defective secondary 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 Replace PCB main.

2. Loose screws on H.V.Transformer

3. Shorted H.V.Diode

turntable motor.

2. Defective turntable motor.

1. Open or loose wiring of primary interlock switch

2. Operation of thermal cutout(Magnetron)

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. Replace turntable motor.

Adjust door and latch switches.

Adjust door and interlock switches.

Consult electrician.

Check wire of door sensing switch.

Tighten screws of fan motor. Tighten screws of H.V.Transformer. Replace H.V.Diode.

Replace turntable motor.

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.

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