Samsung SW70X1PDG XAP Service Manual

7. Troubleshooting

7-1 Self - diagnostic Functions (Buzzer Alarm)

If there is a problem during operation, the following error conditions are shown on the LED display, and the washing machine stops its operation.

SAMSUNG ELECTRONICS CO., LTD 7-1

Error Condition Buzzer Solution

Water level sensor error Water level sensor fails to send The buzzer sounds five times Press the "Power"

signal for longer than 15 seconds. with a 0.5sec. ON/0.5sec. OFF button. No other

cycle. buttons work.

Auto - off error Power does not turn off despite 3 the buzzer sounds five times Press the "Power"

power-off trials by program with a 0.5sec. ON/0.5sec. OFF button.

cycle. Another buttons do

not work.

Water supply error No frequency change for 60 The buzzer sounds five times Press the "Power"

minutes from water supply. with a 0.5sec. ON/0.5sec. OFF button.

cycle. No other buttons

work.

Drain error Water level does not decrease to The buzzer sounds five times Press the "Power"

the reset point within 6 minutes with a 0.5sec. ON/0.5sec. OFF button. from draining water. cycle.

No other buttons work.

Door open error Door is open during The buzzer sounds five times Close the door.

dehydration cycle. with a 0.5sec. ON/0.5sec. OFF

cycle.

Pressing "start" button stop the buzzer. No buttons work.

Unbalance error An unbalanced load is sensed three The buzzer sounds five times Open the door.

times during dehydration cycle. with a 0.5sec. ON/0.5sec. OFF Balance the laundry.

cycle. Close the door.

Pressing "start" button stops the buzzer. No other buttons work.

7-2 Test Mode

7-2-1 Test Mode : WA TER LEVEL + POWER

1. Entering : Press the power key while pressing down the WATER LEVEL button.

2. Ò Ò is displayed on the display.

3. If you press the COURSE key, the test mode changes step by step.

4. The test is conducted if you press the START/HOLD key when the test mode is in a display state.

5. Each mode description

Mode are only for manufacturing process.

7-2 WASHING MACHINE

7. Troubleshooting

MODE NO DISPLAY TEST DESCRIPTION REMARKS

Aging test in driving part and then, driving part and display are turned ON/OFF for 1 second.

Repeating 5 min. dehydration and 3 min. stop without draining. It read Lid open and unbalance and shows them. It shows this on the indicator.

Operate the washing cycle after suppling water to high level.

Indicate the input value of weight sensing pulse with hexa value.

→ 01 → 02 → 03 → 04 → 05 → 06

7-3 Servicing Precautions

When trouble shooting or parts, be sure to observe the following.

1. Be sure to let the resistance of 1 M½contact the human body before grounding. When it is impossible to ground, let the human body contact the power plug and the grounding wire once to eliminate the potential damaging shock hazard.

¥ After replacing the controller, the defective parts

should be returned to the suppliers of these parts for root-cause analysis and incorporation into for future product planning. At the time of return, be sure to pack them together with repair parts. Otherwise, it is impossible to perform root cause analysis due to the static electricity.

2. The wiring should be properly connected in accordance with the wiring diagram. Erroneous wiring may cause faulty operation, smoke, or fire.

3. Be sure to pull out the power plug during repair.

4. Special attention should be paid to connection, insulation treatment, and wiring work for the lead wire.

¥ The lead wire should be soldered, and insulation-

treated with vinyl tape, or connected to the pressure connection terminal for drain treatment.

¥ When connecting the lead wire, take care not to let

it touch hight components of metal sugared. This is a "wloow"

5.Be sure to use only authorized replacement parts.

6. AC 110V-220V is applied between T1 and T2 of the triac on the P.C.B Therefore, touching the radiating plate accidentally may cause electric shock. Also, the P.C.B. Both high and low voltages exist on the P.C.B.

7. Do not replace any parts on the board, except the tact switch on the P.C.B. assembly is in trouble. The P.C.B assembly is treated with an insulation coating, the enhanced moisture-proofing.

8. When you suspect that the operation of the micom is faulty, take actions in accordance with the specified troubleshooting procedures. Do not attempt to replace the entire P.C.B. assembly without first doing a root-cause analysis.

9. Because the parts installed in the P.C.B. are treated with a urethane coating, they cannot be inspected by the test bar. Therefore, first check the lower parts for any abnormality using the lead wire of the housing (LP-09-1). Going down connected with the P.C.B.

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7. Troubleshooting

7-4 Troubleshooting

7-4-1 Troubleshooting of the Power Supply Board

If any of the following occurs, the PCB is defective. Replace the PCB.

1. Pressing a selection button illuminates the LED display, but the buzzer does not sound.

2. Pressing a selection button sounds the buzzer, but does not illuminate the LED.

3. Pressing a selection button illuminates the wrong LED.

Insert the power plug into the receptacle and press the Power button. If the stored parameters do not display, check the following :

7-4-2 Keyboard

¥ When pressing a selection button, the buzzer does not sound, or the LED does not display.

7-4 WASHING MACHINE

7. Troubleshooting

YES

The power does not turn on.

Connect the power plug securely.

Replace the fuse.

Check the harness.

Replace the transformer.

Is the power

plug connected?

Is the fuse blown?

Is the

connection of the power

trans harness OK?

Replace the PCB assembly.

Is the

output of secondary

side of power transformer

AC 11V(Red)?

YES

There is no buzzer sound, and the

LED display does not turn on.

Turn the power switch on.

Replace the selection switch (tact switch).

Is the power

switch turned on?

Are the contacts of the

selection switch OK?

Replace the PCB assembly.

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