DOWNLOAD LG WM3988HMA / WM3988HWA Service Manual ↓ Size: 8.73 MB | Pages: 67 in PDF or view online for FREE

Model
WM3988HMA WM3988HWA
Pages
67
Size
8.73 MB
Type
PDF
Document
Service Manual
Brand
Device
Washing Machine
File
wm3988hma-wm3988hwa.pdf
Date

LG WM3988HMA / WM3988HWA Service Manual ▷ View online

48
Result
Wash Thermistor / Dry Thermistor
Test Points
(1) to (2)
and
(2) to (3)
Result
(tolerance ±5%)
39.5 k
26.1 k
12.1 k
8.5 k
3.8 k
2.8 k
Remarks
At 86°F (30°C)
At 104°F (40°C)
At 140°F (60°C)
At 158°F (70°C)
At 203°F (95°C)
At 221°F (105°C)
Steam generator Thermistor 
Test Points
(1) to (2)
Result
(tolerance ±5%)
39.5 k
26.1 k
12.1 k
8.5 k
3.8 k
2.8 k
2.1 k
1.4 k
1.0 k
0.7 k
0.4 k
Remarks
At 86°F (30°C)
At 104°F (40°C)
At 140°F (60°C)
At 158°F (70°C)
At 203°F (95°C)
At 221°F (105°C)
At 241°F (116°C)
At 266°F (130°C)
At 293°F (145°C)
At 320°F (160°C)
At 356°F (180°C)
49
9-8. STEAM GENERATOR ASSEMBLY
Wiring
diagram
Steam generator Water level sensor
circuit in the MAIN PWB / wiring diagram
Heater & Thermistor : Refer to the 9-6 / 9-7
MAIN PWB
MICOM
Input A
(long)
PHOTO
COUPLER
Input B
(short)
WH
NA
GND L    S
  AG
  SENSOR
VI
PK
YL2
IC 1
IC 2
DC5V
5V
1 2
3
1 2
3
12
3
12
3
4
4
Original
Test
points
1. Steam generator
1) Construction of steam generator
Inlet valve that controls supplying water, Water level sensor that sense amount
of water supply, Thermistor ASSEMBLY the sense inner temperature of Steam
generator, Heater ASSEMBLY that heats water supply, Steam generator CASE
that is container of water supply, nozzle and hose of water supply.
THERMISTOR
ASSEMBLY
HEATER
ASSEMBLY
WATER LEVEL SENSOR
50
Function
2. Water level sensor
1) Structure of water level sensor 
2) Operation mechanism of Steam generator
After supplying some amount of water through inlet valve and water level
sensor, Heater operates and steam generates. Generated steam is sprayed by
nozzle. If the water in the steam generator is reduced by spraying steam, water
level sensor decide to supply water or not.
3) Operation method of Steam generator
The Steam Generator Assembly is supplied as an assembly only; parts like the
water level sensor, thermistor, or heater cannot be replaced individually.
Diagnosis is limited to determining malfunction and replacing as an assembly.
The steam generator does not have to be removed from the machine to be
drained. Be sure to let the water cool to avoid a burn. Have a hose available to
slip onto the connector or a large towel to catch the water so it doesn’t run
down into the machine cabinet. If you remove the steam generator before
draining it,  be sure to avoid tipping it and spilling the water.
2) Function of Water level sensor
It is the part of sensing water level. It decides to supply water or not when the
steam generate. (to protect heater) 
Maximum water level
Minimum water level
common
51
9-9. LAMP
Wiring
diagram
Circuit in the MAIN PWB / Wiring Diagram
16.5V
R
RD3
BL
GY
RD
1 2 3
1 2 3
12
3
12
3
RD
BL
TR
R
MICOM
MAIN PWB
R
Function
Test
points
Result
The Lamp (Drum Light) comes on when the POWER button is pressed. It goes off
when the door is closed and the washer starts operation. It remains off when the
door is locked. It can be turned on while the washer is in operation by pressing the
RINSE+SPIN button for 3 seconds. The lamp will turn off automatically 4 minutes
later. It comes on when the washing cycle is finished and goes off 4 minutes later.
Original
Test Points
(3) to (1)
Result
16.5 Vdc
Remarks
Voltage Input
LAMP
(1) (3)
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