LG WM2550HVCA Service Manual ▷ View online
44
9-8. STEAM GENERATOR ASSEMBLY
Wiring
diagram
diagram
Steam generator Water level sensor
circuit in the MAIN PWB / wiring diagram
circuit in the MAIN PWB / wiring diagram
Heater & Thermistor : Refer to the 9-6 / 9-7
MAIN PWB
MICOM
PHOTO
COUPLER
COUPLER
IC 2
5V
IC 1
YL2
PK
VT
NA
NA
GND L S
AG
SENSOR
DC5V
Input A
(long)
(long)
Input B
(short)
(short)
3
2
1
2
1
4
3
2
1
2
1
4
1
2
3
1
2
3
Original
Test
points
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, hose of water supply.
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, hose of water supply.
WATER LEVEL SENSOR
THERMISTOR
ASSEMBLY
ASSEMBLY
HEATER
ASSEMBLY
ASSEMBLY
45
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, the heater operates and steam generates. Generated steam is sprayed
by nozzle. If the water in the steam generator is reduced by spraying steam,
the water level sensor signals the board to refill the steam generator.
sensor, the heater operates and steam generates. Generated steam is sprayed
by nozzle. If the water in the steam generator is reduced by spraying steam,
the water level sensor signals the board to refill the steam generator.
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.
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 determines the water level in the steam generator and keeps it full protect the
heating element.
heating element.
Maximum water level
Minimum water level
common
46
Be sure to unplug the machine before disassembling and repairing the parts.
CONTROL PANEL
1 Unscrew 2 screws on the back of the top plate.
2 Pull the top plate backward and upward as
shown.
3 Disconnect the Display PWB assembly
connector from the cabling.
4 Pull out the drawer and unscrew 2 screws.
5 Remove one screw.
6 Lift the side the control panel assembly and
pull it out.
7 Unscrew the 8 screws from the control panel
assembly.
8 Disassemble the display PWB assembly.
TOP PLATE ASSEMBLY
CONTROL PANEL ASSEMBLY
DRAWER
CONTROL PANEL ASSEMBLY
DISPLAY PWB ASSEMBLY
10. DISASSEMBLY INSTRUCTIONS
47
MAIN PWB ASSEMBLY
Disconnect the POWER connector and
the pressure switch assembly.
the pressure switch assembly.
Remove the protective cover.
Unscrew 1 screw on the back.
Remove the main PWB.
Disconnect the connectors.
PROTECT COVER
1
2
3
4
5
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