Pump Motor Assembly - LG WM4270HVA Service Manual

8-4. PUMP MOTOR ASSEMBLY

Wiring
diagram
Object
Function
Two pump motors are used to drain the tub and to circulate the water / detergent solution.
Test
points
Result
Circuit in the MAIN PWB
5V
1
R
2
IC
MICOM
Pump Driving circuit
For Drain
Drain Pump
(1)(2)
Drain Pump
Test Points
(1) to (2)
Vdc
Cg
Rg
4
3
Rs
Cs
PCB
CONNECTOR
PUMP
* Each circuits of loads in wiring diagram are all same.
For Circulation
Circulation Pump
Result
10-20 Ω
40
Wiring Diagram
MAIN PWB
NA2
1 2 3 4
1 2 3 4
N B
SB
Vac
BK
BN
DRAIN
PUMP
T.P
(1)
(1) (2)
Circulation Pump
Test Points
(1) to (2)
BL3
1 2 3
1 2 3
K B SB
3 2 1
3 2 1
SB
CIRCULATION
PUMP
(2)
Result
18-30 Ω