LG WM3987H Schematic

Website:http://biz.lgservice.com

WASHING MACHINE SERVICE MANUAL

CAUTION

READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.

MODEL : WM3987H*

NOV. 2009 PRINTED IN KOREA

P/No.: MFL30138960

CONTENTS

1. SPECIFICATIONS .........................................................................................................................3

2. FEATURES & TECHNICAL EXPLANATION ................................................................................ 4

3. PARTS IDENTIFICATION ............................................................................................................ 7

4. INSTALLATION & TEST ............................................................................................................... 8

5. WIRING DIAGRAM ......................................................................................................................11

6. OPERATION ................................................................................................................................12

7. TROUBLESHOOTING.................................................................................................................14

7-1. BEFORE PERFORMING SERVICE ...................................................................................14

7-2. QC TEST MODE.................................................................................................................14

7-3. HOW TO CHECK THE WATER LEVEL FREQUENCY ......................................................14

7-4. ERROR DISPLAY ...............................................................................................................15

8. ERROR DIAGNOSIS AND CHECK LIST ....................................................................................17

8-1. DIAGNOSIS AND SOLUTION FOR ABNORMAL OPERATION ........................................17

8-2. FAULT DIAGNOSIS AND TROUBLESHOOTING ..............................................................20

9. DISASSEMBLY INSTRUCTIONS ...............................................................................................31

10. EXPLODED VIEW .....................................................................................................................40

10-1. CABINET & CONTROL PANEL ASSEMBLY ....................................................................40

10-2. DRUM & TUB ASSEMBLY................................................................................................41

10-3. DISPENSER ASSEMBLY .................................................................................................42

10-4. DRYER............................................................................................................................. 43

1. SPECIFICATIONS

ITEM

COLOR

POWER SUPPLY

PRODUCT WEIGHT

ELECTRIC

POWER

CONSUMTION

REVOLUTION

SPEED

CYCLES

WASH/RINSE TEMPERATURES

SPIN SPEEDS

OPTIONS

WATER CIRCULATION

OPERATIONAL WATER PRESSURE

WASHING

DRAIN MOTOR

WASH HEATER

WASH

SPIN

WM3987H*

BLUE WHITE

AC 120 V, 60 Hz

201 lbs (91kg)

280 W

80 W

1000 W

46 rpm

0 - 1200 rpm

Prewash, Extra Rinse, Stain Cycle, Water Plus, Drum Light Tub Clean,

SPINSENSE

14.5-116 psi (100-800 kPa)

‚ Delay Wash

Incorporated

CONTROL TYPE

WASH CAPACITY [cu.ft]

DIMENSIONS

DELAY WASH

DOOR SWITCH TYPE

WATER LEVEL

LAUNDRY LOAD SENSING

ERROR DIAGNOSIS

AUTO POWER OFF

CHILD LOCK

RLM ENABLE

27" (W) X 29

Electronic

3.63 (4.2 IEC)

" (D) X 38

up to 19 hours

PTC + Solenoid

10 steps (by sensor)

Incorporated

" (H), 50

" (D, door open)

2. FEATURES & TECHNICAL EXPLANATION

ᆺં໺ቚ လ࿥

2-1. FEATURES

Direct Drive System

The advanced Brushless DC motor directly drives the drum without belt and pulley.

Tilted Drum and Extra Large Door Opening

The tilted drum and extra large door opening make it possible to load and unload easily.

Water Circulation

Spray detergent solution and water onto the load repeatedly. Clothes are soaked more quickly and thoroughly during the wash cycle. Detergent suds are eliminated more easily by the water shower during rinse cycle. The water circulation system uses both water and detergent more efficiently.

RollerJets

The washing ball enhances wash performance and reduces damage to clothing.

washing performance while maintaining fabric care.

The jets spray and help tumble clothes to enhance

Automatic Wash Load Detection

Automatically detects the load and optimizes the washing time.

Built-in Heater

The internal heater automatically heats the water to the optimum temperature on selected cycles.

Child Lock

The Child lock feature prevents children from pressing any buttons to change the settings during operation.

2-2. NEURO FUZZY WASHING TIME OPTIMIZATION

To get the best washing performance, optimal time is determined by the water temperature,

the selected washing temperature, and the size of the load.

water

temperature

washing time

selected washing

temperature

SENSING

load

size

PROCESSING

NEURO-

FUZZY

2-3. WATER LEVEL CONTROL

This model incorporates a pressure sensor which can sense the water level in the tub.

The water supply is stopped when the water level reaches the preset level, the washing

program then proceeds.

Spinning does not proceed until the water in the tub drains to a certain level.

rinsing time

spin rhythm, time

DETERMINATION

the best washing performance

EFFECT

2-4. DOOR CONTROL

The door can be opened by pulling the door handle whenever washer is not in operation.

When the cycle is completed, the DOOR LOCKED light will turn off.

If a power failure has occurred while in operation, the door will unlock after 5 minutes.

Clicking sounds can be heard when the door is locked/unlocked.

2-5. THE DOOR CAN NOT BE OPENED

While program is operating

When a power failed and power plug is taken out in operation

While Door Lock lights turn on.

White the motor is in the process of intertial rotating, through the operation is paused.

2-6. DOOR LOCKED LAMP LIGHTS

When the frequency of water level is lower than 22.9 kHz

(It can be canceled when the frequency is more than 23.8 kHz)

When the temperature inside the tub is higher than 45 °C and water level is not 25.5 kHz

(It can be canceled when the water level is 25.5 kHz or the temperature inside the tub is lower than 40 °C)

2-7. CHILD LOCK

Use this option to prevent unwanted use of the washer. Press and hold PRE WASH button for 3 seconds to

lock/unlock control.

When Child lock is set, CHILD LOCK lights and all buttons are disabled except the Power button.

You can lock the washer while it is operating.

2-8. WATER CIRCULATION

When Washing and Rinsing function of shower at the upper part of Gasket.

When Washing, it continuously operates for 3 minutes and intermittently.

When Rinsing, it continuously operates after completion of water supply.

2-9. DRUM LIGHT

The Drum Light comes on when the Power button is pressed. It goes off when the door is closed and the

washer starts operation.

The Drum Light remains off when the door is locked.

The Drum Light can be turned on while the washer is in operation by pressing the Rinse+Spin button for 3

seconds. The light will turn off automatically 4 minutes later.

The Drum Light comes on when the washing cycle is finished and goes off 4 minutes later.

3. PARTS IDENTIFICATION

ACCESSORIES

Hot/Cold (1 each)

Hose

Non-skid pads

Wrench

Caps(4)

(for covering shipping

bolt holes)

Tie strap (Option)

to secure drain hose to standpipe,

inlet hose, or laundry tub

Elbow Bracket

(for securing drain hose)

4. INSTALLATION & TEST

Before servicing, ask the customer what the trouble is.

Check the setup (power supply is 120V AC, remove the transit bolts....).

Check with the troubleshooting guide. Plan your service method by referring to the disassembly instructions. Service the unit. After servicing, operate the appliance to see whether it functions correctly.

STANDARD INSTALLATION

The appliance should be installed as follows:

REMOVE THE SHIPPING INSTALL THE APPLIANCE ADJUST THE

BOLTS

Remove the 4 shipping bolts Turn the leveling feet to adjust

with the supplied wrench. the appliance.

Do first lower side to remove easily.

Keep the shipping bolts and

spanner for future use.

Insert the 4 caps

(provided) into the hole.

ON A FLAT AND FIRM SURFACE

LEVELING

Turn clockwise to raise;

counterclockwise to lower.

HOW TO CONNECT THE INLET HOSE

Verify that the rubber washer is inside of the

valve connecto

Tighten the inlet hose securely to prevent leaks.

CONNECT THE DRAIN HOSE

Make sure that the hose is not twisted.

Avoid submerging the end of the hose.

The end of the drain hose should be placed less than 100 cm from the floor.

CONNECT POWER PLUG

Connect the power plug to the wall outlet.

Avoid connecting several electric devices, as doing so may cause a fire

;7.<-6-:

5)@

TEST OPERATION

Preparation for

washing.

• Connect the power plug to the outlet.

• Connect the inlet hose.

Check the water heating

function.

Press the POWER button.

Check the automatic

reverse rotation.

Press the Start/Pause

button.

• Listen for a click to determine if

the door has locked.

Check the water supply.

•

Press the WASH/RINSE button and the present temperature will be displayed.

Check the drain and spin

functions.

• Power off and the power on.

• Press the SPIN SPEED button.

• Press the START/PAUSE button.

• Check the spin and drain

functions.

• Check if the drum rotates

clockwise and counterclockwise.

Press the

START/PAUSE button.

• Listen for a click to determine

if the door is unlocking.

• Check if water is supplied

through the detergent dispenser.

Water removal.

• If SERVICE is needed during

check, remove the remaining

water by pulling out the hose cap.

5. WIRING DIAGRAM

6. OPERATION

SSAANNIITTAARRYY

SSPPEEEEDD WWAASSHH

BBUULLKKYY//LLAARRGGEE

PPRREEMM..PPRREESSSS

DDEELLIICCAATTEE

RRIINNSSEE++SSPPIINN

CCOOTTTTOONN//NNOORRMMAALL

Power Button

• Use this button to turn the power

On/Off.

Status Indicator

• It shows elapsed time of the cycle the washer

is operating.

Cycle Selector Knob

• Rotate the Cycle selector knob to select the cycle designed for different types of fabric and soil levels.

Start/Pause

• Use this button to Start/ Stop the washer.

WWASH/RINSEASH/RINSE SPIN SPEEDSPIN SPEED SOILSOIL LEVEL LEVEL DDRRYY

EE XXTTRR AA HHOOTT//CCOOLLDD

HOT/COLDHOT/COLD

WWARM/WARM/WARMARM

WWARM/COLDARM/COLD

COLD/COLDCOLD/COLD

EXTRAEXTRA HIGH HIGH

HIGHHIGH

MEDIUMMEDIUM

LOWLOW

NO SPINNO SPIN

3300//6600//9900//112200((MMIINN))

MOREMORE

NORMALNORMAL

LOWLOW TEMPTEMP..

HEAHEAVYVY

▼▼

NORMALNORMAL

LIGHTLIGHT

WWAASSHH RRIINNSSEE SSPPIINN DDRRYY

TUB CLEANTUB CLEAN

Option Button

• PREWASH : Use this option for loads that need pretreatment. It adds 16 minutes prewash and a spin cycle.

• EXTRA RINSE: This option provides an additional rinse.

• STAIN CYCLE: Adds time to the wash and rinse cycles for better stain removal.

Automatically provides a rinse.

• WATER PLUS: Add extra water to the wash and rinse cycles for superior results.

WASH/RINSE, SPIN SPEED, SOIL LEVEL button

• Select a water temperature based on the type of load you are washing.

• To change the spin speed, press the Spin Speed button repeatedly to cycle through available options.

• To change the soil level, press the Soil Level button repeatedly until the desired setting is on.

DRY SELECTOR

• Dry program can be selected by pressing the DRY button.

• By pressing the DRY button, [NORMAL

30/60/90/120 LOW TEMP.

DAMP] can be selected.

+ 30 hidden pages