Trouble Diagnosis - Samsung DV50K Series Service Manual

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4-3. TROuBLE DIAGNOSIS

As the micom dry machine is configured for the complicate structure, there might be a service call.
The below information is prepared for exact trouble diagnosis and suitable repair guide.
■ Caution for the repair and replacement
Please follow below instruction for the trouble diagnosis and parts replacement.
1. As some electronic components can be damaged by static electricity from the resin part of dryer or the human body,
remove the potential difference of the human body and the dryer by contacting the power plug before you start
working at PCB.
2. Since AC220~240V is applied to the triac T1 and T2 on P.C.B, the electric shock may occur by touching. Be careful
the strong and weak electricity are mixed each other.
3. As the P.C.B assembly is designed for no trouble, do not replace the P.C.B assembly by the wrong diagnosis and
follow the procedure of the trouble diagnosis when the micom is not operated normally.
No Problem
Will Not Start or Run
1
Motor runs/ tumbler will not
2
turn
Runs a few minutes and then
3
stops
Blows fuses or trips circuit
4
breaker
Blows fuses or trips circuit
5
breaker (Gas Model)
Will not heat (motor runs)
6
28 _ Troubleshooting
Power supply plug
• All wires are hooked up to their corresponding terminals.
• Is the dryer is plugged in.
• Blown fuse or circuit breaker.
• Is the Door switch functional...door closed. Check for error code 3 (See Table for code
definition).
• Start/Pause rotary selector dial functional.
• Is the control Board operational.
• Belt off or broken and Belt Cut-off Switch operates.
• Is the motor functional.
• Check motor winding resistance: 2.88ohms between pin #3 and 4, 3.5ohms between pin #4
and 5.
• Belt off or broken/damaged.
• Idler tension spring too weak or stretched.
• Idler pulley jammed or stuck.
• Lint buildup around drive motor.
• Low voltage present.
• Blower impeller blocked in blower housing.
• Check the actuator of motor.
- Is the belt connected well?
- Is the winding of the motor continuous? (Rotor winding, stator winding, generator)
- Is the motor protector normal?
• If above points are not found, the PCB assembly is out of order. Replace it.
• During ignition the dryer will draw 6 amps. With the burner ON, the dryer will draw 4.5 amps.
If the dryer is drawing amperages above this, then the house wiring, fuse box or circuit
breaker is suspected to be at fault.
• Igniter harness loose and shorted to base.
• Incorrect wiring or wire shorted to ground.
• Drive motor winding shorting to ground.
Open heating element.
• Hi-Limit trips easily or is open.
• Regulating thermostat trips easily or is open.
• Membrane switch open.
• Check Thermistor.
What to do