Samsung DC68-02836B Technical information

CLOTHES DRYER
Technical Information
• Due to possibility of personal injury or property damage, always contact an authorized technician for servicing or repair of this unit.
• Refer to Service Manual (DV338, DV448, DV438) for detailed installation, operating,
testing, troubleshooting, and disassembly instructions.
CAUTION
All safety information must be followed as provided in Service Manual of
DV338, DV448, DV438.
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to
dryer before servicing, unless testing requires power.
DC68-02365B-01_EN
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ALIGNMENT AND ADJUSTMENTS
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
ERROR ITEMS AND DIAGNOSTIC CODES
An occurrence of an Error will make a sound of error melody for 5sec and con
tinuously show one of the Error Displays from the following errors.
Error Display
LED
LCD
tS
tO
Trigger
The Thermistor
resistance is very low or
high.
Action Taken
Check for :
- Clogged lint screen
- Restricted vent system.
- Check Thermistor resistance.
Check for :
- Close the door, and run the
dryer
- Loose or open wire terminals
in Door sense circuit.
Check for :
- Loose or open wire terminals
in Door
sense circuit.
dO
Running the dryer with
door open
dF
Invalid state for more
than 256 milliseconds
bE
Invalid state of key
circuit short for 75secs
Check for :
- Display PCB key circuit short
or not
od
Invalid Dry time in
excess Dry time
Check for :
- Sensor bar Open
- Using Adjust time Up excessively
hE
Invalid heating Temp in
running the dryer
Check for :
- Restricted vent system.
- Check Thermistor resistance.
Et
Invalid state of Eeprom
communication
Check for :
- PCB on Eeprom circuit
Invalid power source
Frequency
Check for :
- Not using regular power
source frequency
- Invalid power frequency sense
circuit
FE
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ALIGNMENT AND ADJUSTMENTS
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
TEST MODE
Continuous Run Mode
Continuous Run Mode:
1. Press Signal + Dry Level for 3 sec during Power On State (Normal User Mode) .
2. Once in Continuous Run Mode, 7-Segment will toggle display “total cycle” and the remaining time.
3. The previous cycle will restart during Continuous Run Mode until continuous run mode is
disabled.
4. During Continuous Run Mode, press Signal + Dryness Level for 3 seconds to return
to normal user mode. 7-segment will no long display “total cycle ” and only display the
remaining time.
Special Test Mode
Definition of Special Test Mode:
- Dryer must be on before Service Mode can be entered.
- Press Signal and Temp Keys for 3 seconds, or until 3 beeps are heard.
- The machine will now be in Service Mode.
- Upon entry into Service Mode, the Sensor Bar Touch Data will be shown
(Default Special Test Mode).
How to Enter:
- To enter Special Test Mode press Signal and Temp Keys for 3 seconds for 3 seconds or
until the control beep.
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ALIGNMENT AND ADJUSTMENTS
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
Sensor Bar Touch Data Mode
Definition of Sensor Bar Touch Data Mode:
- While in Power On pressing Signal and Temp Keys for 3 seconds
- This action will put the dryer into sensor bar touch data mode
- Dryer will display Sensor Bar data. This mode is default mode of entering service mode
How to Enter:
- While in Power off pressing Signal and Temp Keys for 3 seconds
Cycle Count Mode
Definition of Cycle Count Mode:
- While in Service Mode pressing the Signal key will put the dryer into the cycle count mode
- Cycle number executed will display.
How to Enter:
- To enter Special Test Mode press While in Service Mode pressing the Signal key for 3
seconds or until the control beep.
Software Version Mode
Definition of Software Version Mode:
- While in Service Mode pressing the Temp key will put the dryer into the software version
mode
How to Enter:
- To enter Special Test Mode press Temp Key until the control beep.
ex) In case of “U105”, U0 means major version “v1“ 05 means minor version “05”
System Check Mode
Special Test Mode:
- While in Power Off, pressing the Dryness Level + Power keys simultaneously will put the
dryer into the System Check mode
- “ t2 “ will display.
- System Check Mode Progress
t2 mode Function Performed Start/Pause Motor(CW) Relay On → Heater Relay On →
Heater Relay Off → Motor(CW) Relay Off (Circulation)
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TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
TROUBLE DIAGNOSIS
- As the micom dry machine is configured of the complicate structure, there might be the
service call.
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 are damaged by the charged static electricity from the resin part of dryer or the human body, prepare the human body earth or remove the potential differ ence of the human body and dryer by contacting the power supply plug when the work contacting to PCB is executed.
2) 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.
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TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
No
Problem
1 Will Not Start or Run
2
Motor runs/ tumbler
will not turn
Runs a few minutes
3
and then stops
4
Blows fuses or trips
circuit breaker
Blows fuses or trips
5 circuit breaker
(Gas Model)
6
Will not heat
(motor runs)
Will Not Dry Gas
7 Model Poor Gas
Ignition
What To Do
• All wires are hooked up to their corresponding terminals.
• Dryer is plugged in.
• Blown fuse or circuit breaker.
• Door switch functional...door closed. Check for error code 3
(See Table for codedefinition).
• Start/Pause rotary selector dial functional.
• Control Board operational.
• Belt off or broken and Belt Cut-off Switch operates.
• Drive 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.
• Drive motor - start switch contacts stuck closed.
- 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 X amps. With the burner
ON, the dryer will draw X 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.
When the dryer is operated on a heat setting, the igniter should
be energized and burner shall fire within 45 seconds at 120
VAC. The failure of a component in this system will usually be
indicated by one of three symptoms:
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TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
8
The igniter does not
glow
If the igniter does not heat up, remove power and using an
ohmmeter, check the following:
• Open flame sensor
• Open igniter
• Shorted booster coil
• Open wiring
• Bad motor switch ( Neutral supply)
• No power from control ( L1 supply)
If the igniter heats up but the main burner flame is not ignited,
remove power and using an ohmmeter, check the following:
Igniter glows - No gas • Open secondary coil
9
• Open holding coil
ignition
• Open wire harness
• Stuck flame sensor (Stuck closed)
If a normal ignition takes place and after a short while the flame
goes out, check for the following:
• Radiant sensor contacts opening prematurely.
The gas is ignited but • Weak gas valve coil may open when stressed by higher
10
Temps.
the flame goes out
• Weak Hi-Limit
• Poor venting
• Bad drum seals
Improper drying
clothes wrinkled
11
Rough texture
long dry time
12
Noisy and/Or
Vibration
• Lint filter is not clean.
• Restriction in exhaust.
• Outside exhaust hood damper door stuck closed.
• Exhaust too long, too many elbows, flex ductwork installed.
• Poor intake air available for the dryer.
• Incorrect tumbler speed. Tumbler belt slipping.
• Blower impeller bound; check for foreign material in blower
area.
• Customer overloading dryer.
• Check clothing labels for fabric content and cycle selected.
• Clothes too wet due to insufficient spin out by washer.
• Thumping Check for loose tumbler baffle, rear tumbler roller(s)
worn or misaligned, out-of-round tumbler or high weld seam
on tumbler.
• Ticking Check for loose wire harness or object caught in
blower wheel area.
• Scraping Check for front or rear bulkhead felt seal out of position or worn tumbler front bearings.
• Roaring Check for blower wheel rubbing on blower housing or
bad motor bearings.
• Popping or squealing sound. Check for a sticky or frayed belt.
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TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
COMPONENT TESTING PROCEDURES
● Belt Cut-off S/W
- Lever open: Resistance value < 1Ω
- Lever push: Resistance value
Component Electrical Testing (with ohmmeter)
● Thermistor resistance 10K Ω @ 25°C 77°F
(2P-Blue & Red wire)
● Thermostat 1 resistance < 1Ω (White &
Yellow wire)
●
●
●
Thermostat 3 resistance < 1Ω (Red &
Black wire)
-If resistance is infinity, replace thermostat 3.
Thermostat 2 resistance < 1Ω (Blue &
Black wire)
-If resistance is infinity, replace thermostat 2.
Heater resistance 10 Ω (Blue & Blue wire)
-If resistance is infinity, replace Heater.
● Lamp resistance 80~100 Ω (Violet & gray)
● Motor (Electronic & GAS)
Contacts
Function 1M
Start
Run
● Measure resistance of the following terminal
1) Door switch knob: open
Terminal : “COM” - “NC” (1-3) : ∞ Ω
Terminal : “COM” - “NO” (1-2) < 1Ω
2M
3M
5M
6M
= Contact closed
Centrifugal Switch (Motor)
2.88Ω between
Pin# 3 and 4
2) Door switch push: On
Terminal : “COM” - “NC” (1-3) : ∞ Ω
Terminal : “COM” - “NO” (1-2) < 1Ω
3.5Ω between
Pin# 4 and 5
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TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
GAS MODEL
Gas Valve(25M01A)
Valve 1-2 : Resistance value 1.2K Ω
Valve 1-3 : Resistance value 0.5K Ω
Valve 4-5 : Resistance value 1.2K Ω
If resistance is infinity, replace Valve
Radiant Sensor(10RS)
Resistance value < 1 Ω
If resistance is infinite, replace Radiant
sensor
Igniter(101D)
Resistance value 40~400 Ω
If resistance is infinite, replace Igniter
Thermostat (60T21 Hi-Limit)230F-50F
Resistance value < 1 Ω
If resistance is infinity, replace Thermostat
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TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
CN1
1. AC Power Port
2. AC Power Off Detection
Sensor
3. Door Detection Sensor
RY5
- Motor Relay Switch
RY6
- Heater Relay Switch
Sensor Bars & temperature sensor check
Sensor Bars - Disconnect harness and test Pink
wire Pin 4 to Orange wire Pin 5.
Approx ∞ Ω without laundry
Approx 190Ω ± 10% with wet clothes
Cycling Thermostat - Disconnect harness and
test Blue wire Pin 2 to Red wire Pin 6.
Approx 10 KΩ at 25 °C/77 °F
10
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TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
3-WIRE SYSTEM CONNECTIONS
1.Loosen or remove center terminal block screw.
2.Connect neutral wire (white or center wire) of the power cord to the center, silver-colored terminal screw of the terminal block. Tighten screw.
3.Connect the other wires to outer terminal block screws. Tighten screws.
4.Tighten strain relief screws.
5.Insert tab of terminal block cover into your dryer’s rear panel slot.
Secure cover with hold-down screw.
1. External ground connector
2. Neutral grounding wire (green/yellow)
3. Center silver-colored terminal block screw
4. Neutral wire (white or center wire)
5. 3/4” (1.9 cm) UL-listed strain relief
WARNING: If converting from a 4-wire electrical system to a 3-wire, the ground strap must be reconnected to the terminal block support to ground the dryer frame to the neutral conductor.
4-WIRE SYSTEM CONNECTIONS
1.Remove center terminal block screw.
2.Connect ground wire (green or unwrapped) of power cord to external ground conductor screw.
3.Connect neutral wire (white or center wire) of power cord and appliance ground wire (green with yellow stripes) under central screw of the terminal block.
4.Connect the other wires to outer terminal block screws. Tighten screws.
5.Tighten strain relief screws.
6.Insert tab of terminal block cover into your dryer’s rear panel slot.
Secure cover with hold-down screw.
1. External ground connector
2. Green or bare copper wire of power cord
3. 3/4 in. (1.9 cm) UL-listed strain relief
4. Center silver-colored terminal block screw
5. Grounding wire (green/yellow)
6. Neutral wire (white or center wire)
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WIRING DIAGRAM
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
WIRING DIAGRAM
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