Pump Motor Assembly - LG WM3988HWM Service Manual

9-4. PUMP MOTOR ASSEMBLY

Wiring
diagram
Object
Function
Test
points
Result
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Circuit in the MAIN PWB
5V
1
R
2
IC
MICOM
Pump Driving circuit
For Drain
Two pump motors are used to drain the tub and to circulate the water / detergent solution.
Drain Pump
(1)(2)
Drain Pump
Test Points
(1) to (2)
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Vdc
Cg
Rg
4
3
Rs
Vac
Cs
PCB
CONNECTOR
PUMP
* Each circuits of loads in wiring diagram are all same.
For Circulation
Circulation Pump
(1)
(2)
Result Test Points
10-20 Ω
(1) to (2)
44
Wiring Diagram
MAIN PWB
BL4
1 2 3 4 1 2 3
1 2 3 4 1 2 3
BN BK
3 2 1
SB
3 2 1
BK
SB
BN
DRAIN CIRCULATION
PUMP PUMP
T.P
(1) (2)
Circulation Pump
Result
18-30 Ω
BL3
SKY