LG WF-T851 User manual
WASHING MACHINE
SERVICE MANUAL
MODEL : WF-T851 / T852 / T853 / T802 / T902
WF-T652(T652A) / T452(T452A) / 402
CAUTION
BEFORE OFFERING SERVICE, READ THIS MANUAL
CAREFULLY TO DIAGNOSE
TROUBLES CORRECTLY.
2
CONTENTS
11. SPECIFICATIONS ......................................................................................................................3
12. FEATURES & TECHNICAL EXPLANATION..............................................................................4
13. PART IDENTIFICATION ...........................................................................................................12
14. INSTALLATION INSTRUCTION...............................................................................................15
15. SCHEMATIC DIAGRAM...........................................................................................................18
16.OPERATING INSTRUCTION ....................................................................................................20
7.PROGRAM CHART...................................................................................................................34
18. TEST RUNNING WITHOUT WATER........................................................................................41
09. ADJUSTMENT..........................................................................................................................45
10. DISASSEMBLY INSTRUCTION...............................................................................................46
11.TROUBLE SHOOTING METHODS ACCORDING TO ERROR MESSAGE .............................52
12. HOW TO DIAGNOSE AND REPAIR BY SYMPTOM................................................................56
13. EXPLODED VIEW ...................................................................................................................67
14. RPL
DISASSEMBLE POWER CORD BEFORE SERVING
RECONNECT ALL GROUNDING DEVICES
IMPORTANT SAFETY NOTICE !
This service information is intended for individuals
possessing adequate backgrounds of electrical,
electronic and mechanical experience.
Any attempt to repair this appliance may result in
personal injury or property damage.
The manufacturer or seller can not be responsible
for the interpretation of this information, nor can it
assume any liability in connection with its use.
CAUTION !
POWER SOURCE
CAPACITY
WASH TYPE
WEIGHT(NET)
DIMENSION(mm)
EX-LARGE
LARGE
MEDIUM
SMALL
OPERATION WATER
PRESSURE
PULSATOR rpm
SPIN rpm
WASHING PROGRAMS
LINT FILTER
PULSATOR(Ø)
PUNCH(Ø)
WATER FALL
SOFTENER DISPENSER
ITEM WF-T902 WF-T851 WF-T853
WF-T802/T852
WF-T652(A) WF-T452(A) WF-402
Refer to rating label on the back of washer
Refer to rating label on the back of washer
IMPELLER TYPE
47 kg 41 kg 32 kg
98ℓ94ℓ78ℓ55ℓ
76ℓ70ℓ64ℓ48ℓ
62ℓ55ℓ54ℓ35ℓ
45ℓ40ℓ44ℓ25ℓ
190ℓ 170ℓ110ℓ
30kpa~800kpa(4 p.s.i ~115 p.s.i)
110 ~ 140
660 740 730
3
1. SPECIFICATIONS
WATER
LEVEL
(7 LEVELS)
STANDARDWATER
CONSUMPTION
(NORMAL&EX-LARGE
WATERLEVEL)
NORMAL,
SPEEDY,
JEAN,
DELICATE,
WOOL,
FAVOURITE
DOUBLE
395
Ø 90
THREE AUTOMATICº
Ø 74
TWO ONE
375 325
SINGLE
NORMAL, HEAVY,
SPEED, WOOL NORMAL,
DELICATE,
SPEEDY,
JEAN,
WOOL,
FAVOURITE
NORMAL, HEAVY,
SPEEDY, WOOL
625(W)x625(D)x1007(H)mm
590(W)x606(D)
x958(H)mm
632(W)x688(D)
x1029(H)mm
632(W)x688(D)
x1045(H)mm 540(W)x540(D)
x850(H)mm
530(W)x540(D)
x850(H)mm
4
M
S
2.
FEATURES & TECHNICAL EXPLANATION
FUZZY LOGIC CONTROL
2-1.FUZZY CONTROL DIAGRAM
<How to measure the pulse number>
■
The clothes amount sensor detects loads
working on the motor by measuring pulse
number of the electromotive force which
occured after motor power is off.
Clothes amount sensor
FUZZY REASONING
measuring loads by
turning the pulsator
2 times
measured pulse
number (X1)
Clothes kindClothes amount
1.WATER LEVEL 3.WASH TIME
2.CURRENT CIRCULATION 4.SPIN TIME
(WASH ACTION)
measured pulse
number (X2) measured pulse
number (X3) measured pulse
number (X4)
measuring loads by
turning the pulsator
2 times
measuring loads by
turning the pulsator
2 times
measuring loads by
turning the pulsator
2 times
Et Ew
decision
Ew=(X3×X4)-(X1+X2)
Voltage
Reverse electromotive
force
5
2-2.COMPARISON OF FUZZY WASHER & CONVENTIONAL WASHER
Fuzzy
Washer
Low High
It senses and controls
the categories between
yes and no.
Start Washing Auto
power off
Sensing Fuzzy Control Auto Setting
Laundry
amount
sensor Fuzzy
Reasoning
#Water Level
#Wash Time
#Wash Action
#Spin Time
Water
Level
sensor
Conven-
tional
Washer
Low High
It works according to
the selection of
yes and no.
Start Washing Manual
power off
Manual Setting(WF-T902, T851, T802)
Water
Level Wash
Time Spin
Time Spin
Time
1
0
1
0
AUTOMATICALLY
Washing Process
Washing Process
Control Concept
Control Concept
☞
☞
☞
☞
☞
☞
6
2-3. TURBO DRUM WASH (Except for WF-4020
A) FUNCTIONAL PRINCIPLE
■Pulsator rotates right & left direction by motor driving force and drum rotates in the opposite direction to
the pulsator by inertia force & motor driving force, that is achieved by the new clutch and the new drain
motor, while only pulsator rotates right & left in a conventional washer.
ⓕ
ⓒ
ⓓ
ⓖ
ⓔ
ⓑ
ⓐ
DRUM
PULSATOR
OUTER TUB
MOTOR
V-BELT CLUTCH
·The drum is possible to rotate by the new clutch removing the counter
revolution-protecting device, changing the clutch spring-B to the dual
actuating type and releasing the brake band which is activated by the
new drain motor operated with two steps.
·Revolution speed step down as follows.
MOTOR C-PULLEY PULSATOR
DRUM
WASH
SPIN
DRUM
V-belt Planet. gear
(1/5~5.2)
Directly
7
B) WORKING PRINCIPLE BY PROCESS
SENSING
LAUNDRY
AMOUNT
WASH
or
RINSE DRAIN SPIN
1. Clutch mechanism
·Clutch
Spring-B(ⓒ)
·Brake Band(ⓓ)
·Clutch Lever
3. Wash Motor
2. Drain Motor
·SW1
·SW2
4. Power transmitting
Sequence ① ② ⓐ
ⓔ ⓕ ④
Pulsator
ⓖ & ⑤
Drum
(Drum rotates mainly
by reacted force to
pulsator action)
① ② ④ ① ② ⓐ ⓑ ⓒ ⓖ ⑤
Do not work
OFF
OFF
Rotates at
bidirection Rotates at
bidirection Rotates at
one direction
Doesn’t rotate
1st step moved
ON
OFF
2nd step moved
(Drain Valve open)
ON
ON
2nd step moved
(Drain Valve open)
ON
ON
·Released
·Fastened
·Do not work
·Released
·Released
·1st step moved
·Fastened
·Released
·2nd step moved
·Fastened
·Released
·2nd step moved
5. Working State of
Clutch & Drain
Motor
Pulsator rotates at
bidirection Pulsator & Drum
rotates at bidirection
each other
Pulsator & Drum
doesn’t rotates Drum rotates
at one direction
8
C) STRUCTURE OF THE NEW CLUTCH
D) DRAIN MOTOR & CIRCUIT DIAGRAM
SW1
SW2
WASH SPIN
PINK BL / WH
1 3
BL
2
GY
4
AC(Rating
Voltage)
Two clutch cams
3Pin
Two clutch bosses
9
2-4. REED SWITCH FOR APPLIANCE SAFETY(WF-402, T652A, T452A)
2-5. BALL PRESSURE SENSOR
Interrupt system of reed S/W is differed from safety S/W incorporated in the
previous models. Reed S/W is located on PWB ASM and operated with a magnetic
incorporated inside of Lid-B systemically. If Lid is the closed position, the magnetic
operates the contact of Lid S/W. In this case, the machine can do the normal
operation because the current pass through the contacts. On the other hand, the
contacts is open after Lid is the open position, the machine is stoped because the
magnetic is far from the Reed S/W. So do not place any electric appliance with a
charging battery, magnetically-driven appliance and magnetic body on the washer.
It makes misoperation of washing machine process.
To detect unbalance, the electronic sesing system is used which is differ from safety
S/W incoporated in the previous models. In the abnormal operation like unbalance
of clothes during spinning, etc, the ball inside of sensor is moved. In this case the
inductance of sensor is differ from the initial condition. So micom sense the
unbalance condition by ball movement. Ball pressure sensing system is higher
safety performance, sesing vertical movements and no deformation and noise by
over of safety S/W.
LC Harmonic frequency
<Frequency wia ball geight>
<STRUCTURE> <INDUCTANCE VARIANCE>
<Frequency Graph><Ball Movement>
Normal
Condition
Unbalavced
Condition
Inductance [mH]
[Hz]
[Sec]
h[mm]
25
20
15
10
5
0
0 100 200 300 400 500
-5
35
30
25
20
15
10
5
0
-5
0 100 200 300 400 500 600
10
2-7. AUTOMATIC CORRECTION FOR THE UNBALANCED LAUNDRY
DURING SPINNING
When an unbalance of laundry occurs during spinning the unbalance will be automatically corrected
1times but 2nd unbalance will make the machine stop and “UE” is on the DISPLAY.
In that case, open the lid, correct the unbalance and press the START/PAUSE button.
2-8. LID SWITCH FOR APPLIANCE SAFETY (WF-T851, T902)
Interrupt system of LID SWITCH is differed from SAFETY SWITCH incorporated in the others models. LID
SWITYCH is located on TOP COVER and operated with a magnetic incorporated inside of LID-B
systemically. If LID is the closed position, the magnetic operates the contact of LID SWITCH. In this case,
the machine can do the normal operation because the current pass through the contacts. On the other hand
the contacts is open after LID is the open position, the machine is stopped because the magnetic is far from
the LID SWITCH.
Top Cover
Lid-B
Magnet(inside)
2-6.TRIPLE WATER FALL SYSTEM
The washing and rinsing effects have been improved by adopting the water system in
which water in the tub is circulated in a designed pattern. When the pulsator operates during
the washing or rinsing process, water below the pulsator is sucked upwards by the rotation of
the pulsator vanes, creating a water flow as shown in Fig 1.
The water is then discharged from the upper part of the tub through the water channel
provided. circulating water with level and clothes load only and regular water flow as shown
in Fig 2.
Pulsator
Tub Outer
Tub
Pulsator
vane
Water
channel
<Fig 1> <Fig 2>
Clutch Motor
This manual suits for next models
9
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