LG WM1873FDS Service Manual ▷ View online
41
FOR AUTHORIZED SERVICE TECHNICIAN
9-5. HEATER ASSEMBLY
1. The wash heater is designed to raise the wash water to the desired temperature
selection during certain wash cycles.
2. The steam generator heater is designed to make the water to the steam during
steam cycles.
Result
Test points
Function
Wering
diagram
* Each circuits of loads in wiring diagram are all same.
Wash Heater
Wiring diagram
Circuit in the MAIN PWB
Test Points
(1) to (2)
(1) to (2)
12-18
Result
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FOR AUTHORIZED SERVICE TECHNICIAN
9-6. THERMISTOR ASSEMBLY
Circuit in the MAIN PCB / Wiring Diagram
43
FOR AUTHORIZED SERVICE TECHNICIAN
Result
Wash Thermistor
Test Points
(1) to (2)
Result
(tolerance ±5%)
39.5 kΩ
26.1 kΩ
12.1 kΩ
26.1 kΩ
12.1 kΩ
8.5 kΩ
3.8 kΩ
2.8 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 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 kΩ
26.1 kΩ
12.1 kΩ
26.1 kΩ
12.1 kΩ
8.5 kΩ
3.8 kΩ
2.8 kΩ
2.1 kΩ
1.4 kΩ
1.0 kΩ
0.7 kΩ
0.4 kΩ
3.8 kΩ
2.8 kΩ
2.1 kΩ
1.4 kΩ
1.0 kΩ
0.7 kΩ
0.4 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 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)
At 293°F (145°C)
At 320°F (160°C)
At 356°F (180°C)
44
FOR AUTHORIZED SERVICE TECHNICIAN
10. DISASSEMBLY INSTRUCTIONS
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
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
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
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