Samsung DV448AEP, Service Manual

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36 _ Troubleshooting
4-5. COMPONENT TESTING PROCEDuRES
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing
requires power.
■
Component electrical testing (with ohmmeter)
• Thermistor resistance 10K Ω at 25°C 77°F
• Thermostat 1 resistance < 1Ω
Thermostat 1
Thermistor
85 °C, 25A thermal cut-off
• Thermostat 3 resistance < 1Ω
- If resistance is infinity, replace thermostat 3.
• Thermostat 2 resistance < 1Ω
- If resistance is infinity, replace thermostat 2.
• Heater resistance 10 Ω
- If resistance is infinity, replace Heater.
THERMOSTAT 2
THERMOSTAT 3
HEATER
• Measure resistance of the following terminal
1. Door switch knob: open
Terminal : “COM” - “NC” (1-3) < 1Ω
Terminal : “COM” - “NO” (1-2) : ∞ Ω
2. Door switch push: On
Terminal : “COM” - “NC” (1-3) : ∞ Ω
Terminal : “COM” - “NO” (1-2) < 1Ω
Door S/W
125V/10A
• Belt Cut-off S/W
- Lever open: Resistance value < 1Ω
- Lever push: Resistance value ∞ Ω
Belt cut-off S/W
125V, 15A
• When voltage (DC10V) is linked, Lamp confirms that is lighted up.
DC12V
• Motor (Electronic & GAS)
Contacts ( : Contact closed)
Function 1M 2M 3M 5M 6M
Start
Run