LG WT-R10686 Service Manual ▷ View online
5-2. DOOR LOCK SWITCH ASSEMBLY
49
Wiring
diagram
Function
Circuit in the MAIN PCB / Wiring Diagram
The Door Lock Switch Assembly consists of a DC Motor, a Bimetal, a Protection PTC, Sensing Point.
It locks the door during a wash cycle.
1. Operation for door closing
- After the system turns on, Micom sending motor locking signal.
- 12V motor is working.
- Spring that connected with motor shaft is working.
- The hook that connected with spring is pushed out.
- Door lock is detected when switch sensing point is detected lock position.
- The motor stop.
- Door locked
The maximum, allowable number of impulse authorizations is 3
- Upon the third authorization of the impulse, the position of hook goes back to the door-open
position.
- Authorizing the impulse occurs in 4.5 seconds upon input for max performance and two
authorization processes are allowed at most.
2. Operation for door opening
- With a temporary stop, door automatically opens by hook moving after micom send open signal
and the power turns off – maximum of 3 times of the authorizing period
- Upon the fourth authorization of the impulse, the position of CAM goes back to the door-close
position.
50
Test points
Result
(1)
(2)
(3)
(4)
(5)
(6)
Test Points
Result
(1)To (2)
(1)-Black / (2)-Brown
33 ~ 46 Ω
(4) To (5)
(4)-White / (5)-Green
9 ~ 11 AT
5-3. STATOR ASSEMBLY
51
Wiring
diagram
Function
Test points
(Windings)
Result
(Windings)
Circuit in the MAIN PCB / Wiring Diagram
The DD motor can be driven from stopped to maximum speed in infinite steps in either direction.
There are 36 poles on the stator; 12 permanent magnets spaced around the rotor. There are no
brushes to wear out. Unlike a more traditional brushless motor, the rotor surrounds the stator
rather than being attached to it.
Result
5-15 Ω
5-15 Ω
5-15 Ω
5-15 Ω
5-15 Ω
Test Points
(1) to (2)
(2) to (3)
(3) to (1)
(2) to (3)
(3) to (1)
WINDINGS
(1)
HALL SENSOR
(3)
(2)
52
Test
point
and
Result
(Hall
Sensor)
- Voltage Testing Hall Sensor at Stator
If measuring voltage from the Main PCB Assembly to the Hall Sensor, use the following steps:
1. Unplug power cord.
2. Remove rear washer panel.
3. Locate Hall sensor connector on the stator behind the rotor.
4. Place meter leads on terminals 5 to 4, white to gray.
5. Plug in power cord, close door, and press power button.
DO NOT PRESS START!
6. You should measure 10 to 15 Vdc. If 10 to 15 Vdc is present, control board, white wire, and gray
wire are OK! If not follow testing output voltages on control board in next section.
7. To measure output signal voltage from the hall sensor, carefully move test leads to terminals 1 to
4, blue and gray. Slowly rotate motor rotor by hand. You should read a pulsing 10 Vdc. If 10 Vdc is
measured from 1 to 4, move lead on blue wire to red wire, terminal 2. Repeat rotating motor rotor
by hand. You should read a pulsing 10 Vdc from red to gray.
8. If pulsing 10 Vdc is measured from 1 to 4 and 2 to 4, hall sensor is OK! If either test netted only 9
to 10 Vdc without changing (no pulsing) the hall sensor is likely defective. Disconnect power by
unplugging washer and ohm check hall sensor to verify failure of the hall sensor.
The hall sensor determines the speed and direction of the motor.
It also can read that the load is off balance when the drum speed fluctuates.
(1)
(2)
(3)
(4)
(5)
Result
3 MΩ ↑
3 MΩ ↑
3 MΩ ↑
9 kΩ ↑
9 kΩ ↑
9 kΩ ↑
Test Points
(1) To (4)
(2) To (4)
(1) To (5)
(2) To (5)
(2) To (4)
(1) To (5)
(2) To (5)
Remarks
Resistance
Resistance
Resistance
Resistance
Resistance
Resistance
Resistance
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