LG WM3650HVA Service Manual ▷ View online
45
9-7. THERMISTOR ASSEMBLY
Wiring
diagram
diagram
Circuit in the MAIN PWB / Wiring Diagram
MAIN PWB
MICOM
NA3
BL
BN
WH
1
2
1
2
1
2
1
2
WH
WASH
THERMISTOR
STEAM
GENERATOR
THERMISTOR
1
2
3
4
5
6
1
5V
5V
R
R
R
R
C
C
C
C
2
3
4
5
6
Function
Test
points
points
The thermistor (temperature sensor) is used to monitor water temperature in the tub
or Steam Generator.
or Steam Generator.
Wash Thermistor
(2)
(1)
Steam generator Thermistor
(1) (2)
(1) (2)
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Result
Wash Thermistor
Test Points
(1) to (2)
Result
(tolerance ±5%)
39.5 kΩ
26.1 kΩ
12.1 kΩ
8.5 kΩ
3.8 kΩ
2.8 kΩ
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)
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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.
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.
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)
steam generate. (to protect heater)
Maximum water level
Minimum water level
common
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10. DISASSEMBLY INSTRUCTIONS
CONTROL PANEL ASSEMBLY
DISPLAY
PWB ASSEMB LY
PWB ASSEMB LY
1
Unscrew 2 screws on the back of the top plate.
Be sure to unplug the machine before disassembling and repairing the parts.
2
Pull the top plate backward and upward as shown.
4
Pull out the drawer and unscrew 2 screws.
5
Remove one screw.
8
Disassemble the Display PWB Assembly.
6
Lift the side the control panel assembly and
pull it out
7
Unscrew the 8 screws from the control panel
assembly.
3
Disconnect the Display PWB assembly connector
from trans cable.
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