LG WT1701CV / WT1701CW Service Manual ▷ View online
5. COMPONENT TESTING INFORMATION
5-1. Filter Assembly (Line Filter)
41
When resistance (Ohm) checking the component, be sure to turn the power off, and do
voltage discharge sufficiently.
Wiring
diagram
Test
points
and
Result
Circuit in the MAIN PCB / Wiring Diagram
MAIN PCB
ASSEMBLY
3 3
1 1
RD1
WH1
Vac
1 1
2 2
2 2
Test Points
WH (1) to RD (1)
WH (3) to RD (2)
WH (3) to RD (2)
Result
0 Ω
0 Ω
0 Ω
(1)
(3)
(1)
(2)
RD1
WH1
WARNING
42
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.
43
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
44
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)
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