LG WT1201CW Service Manual ▷ View online
41
5-2. Door Lock Switch Assembly.
Wiring
diagram
Function
Circuit in the MAIN PCB / Wiring Diagram
The Door Lock Switch Assembly consists of a Solenoid, Plunger, Level, Key,
Sol-spring and Micro Switch. It locks the door during a wash cycle.
1. Door lock operation
- When a cycle is started, the PCB sends the door lock signal if Reed switch detects that the door
is closed.
- 16.5V is supplied to Solenoid.
- Magnetic force that is caused by solenoid operation inserts Plunger into Solenoid.
- The Level that connected with plunge is pushed out the key.
- The key must be in the proper position for the PCB to sense that the door is locked, otherwise the
dL error code will be displayed.
- If the latch does not extend far enough, the PCB will display the dL error code. This can happen,
for example, if the solenoid does not operate.
Note: The door will attempt to lock 3 times. If it does not successfully lock, the solenoid will drive
the latch to the open position.
2. Door unlock operation
- When the cycle ends, or if the cycle is paused, the PCB sends an unlock pulse to the solenoid.
-The key will attempt to unlock three times. If it fails to sense that the door is unlocked,
the solenoid will be driven to the lock position.
42
Test points
(1)
(7)
(13)
(9)
(6)
(8)
(6)
(8)
(11)
(10)
(5)
(4)
(3)
(2)
(12)
Parts
COVER
SCREW
LEAD WIRE
PACKING
SOLENOID
CASE
HAND WIRE
MICRO SW
SOL-SPRING
PLUNGER
KEY
LEVER
RUBBER CASE
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
5-3. STATOR ASSEMBLY
43
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)
44
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
Click on the first or last page to see other WT1201CW service manuals if exist.