Component Tesing Information (Dryer) - LG W3S1 Series Service Manual

8-7. Component Tesing Information (Dryer)

When Checking the component, be sure to turn the power off, and do voltage
CAUTION
discharge sufficiently.
Component
1. Thermal cut off
Check Top Marking: N140
2. Hi limit Thermostat (Auto
reset)
3. Outlet Thermostat
(Cut off)
Check Top Marking: N85
4. LED Lamp
5. Door switch
6. Idler switch
Test Procedure
Measure resistance of terminal to
terminal
① Open at 284 ± 9˚F
(140 ± 5˚C)
② Auto reset -31˚F (-35˚C)
Same shape as outlet thermostat.
Measure resistance of terminal to
terminal
① Open at 257 ± 9˚F
(125 ± 5˚C)
② Close at 201 ± 9˚F
(94 ± 7˚C)
Measure resistance of terminal to
terminal
① Open at 185 ± 9˚F
(85 ± 5˚C)
Same shape as thermal cut off.
Schematic:
Measure resistance of the
following terminal
1) Door open
① Terminal: COM - NC (1-3)
② Terminal: COM - NO (1-2)
2) Door closed
① Terminal: COM - NC (1-3)
② Terminal: COM - NO (1-2)
Measure resistance of the
following terminal:
COM - NC
Check result
If thermal fuse is open must
be replace
① Resistance value ≒ ∞
② Continuity (250˚F ↓) ˂ 1Ω
① Resistance value ≒ ∞
② Resistance value ˂ 5Ω
① Resistance value ≒ ∞
② Resistance value ˂ 5Ω
If the lamp is turned on by
connecting is normal.
① Resistance value ˂ 1Ω
② Resistance value ≒ ∞
① Resistance value ≒ ∞
② Resistance value ˂ 1Ω
1. Lever open
① Resistance value ˂ 1Ω
2. Lever push (close)
② Resistance value ≒ ∞
- 87 -
Remark
• Heater case-
Safety
• Electric type
• Heater case-
Hi limit
• Electric type
• Blower
housing -
Safety
It is not
measured by
multimeter
because V is
th
3.2V