Samsung DV438AER Technical Information

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CLOTHES DRYER Technical Information

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

• 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.

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WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

ALIGNMENT AND ADJUSTMENTS

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

Trigger Action Taken

LED LCD

The Thermistor resistance is very low or

high.

Check for :

- Clogged lint screen

- Restricted vent system.

- Check Thermistor resistance.

Running the dryer with door open

Check for :

- Close the door, and run the dryer

- Loose or open wire terminals in Door sense circuit.

Invalid state for more than 256 milliseconds

Check for :

- Loose or open wire terminals in Door

sense circuit.

Invalid state of key circuit short for 75secs

Check for :

- Display PCB key circuit short or not

Invalid Dry time in excess Dry time

Check for :

- Sensor bar Open

- Using Adjust time Up excessively

Invalid heating Temp in running the dryer

Check for :

- Restricted vent system.

- Check Thermistor resistance.

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

ERROR ITEMS AND DIAGNOSTIC CODES

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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

Denition 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.

TEST MODE

Continuous Run Mode

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

ALIGNMENT AND ADJUSTMENTS

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WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

ALIGNMENT AND ADJUSTMENTS

Sensor Bar Touch Data Mode

Denition 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

Denition 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

Denition 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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WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

TROUBLE SHOOTING

TROUBLE DIAGNOSIS

- As the micom dry machine is congured 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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No Problem What To Do

1 Will Not Start or Run

• 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 codedenition).

• 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.

Motor runs/ tumbler will not turn

• Belt off or broken/damaged.

• Idler tension spring too weak or stretched.

• Idler pulley jammed or stuck.

Runs a few minutes and then stops

• Lint buildup around drive motor.

• Low voltage present.

• Blower impeller blocked in blower housing.

• Drive motor - start switch contacts stuck closed.

Blows fuses or trips circuit breaker

- 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.

Blows fuses or trips circuit breaker (Gas Model)

• 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.

Will not heat (motor runs)

Open heating element.

• Hi-Limit trips easily or is open.

• Regulating thermostat trips easily or is open.

• Membrane switch open.

• Check Thermistor.

Will Not Dry Gas Model Poor Gas Ignition

When the dryer is operated on a heat setting, the igniter should

be energized and burner shall re within 45 seconds at 120

VAC. The failure of a component in this system will usually be indicated by one of three symptoms:

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

TROUBLE SHOOTING

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WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

TROUBLE SHOOTING

The igniter does not glow

If the igniter does not heat up, remove power and using an ohmmeter, check the following:

• Open ame sensor

• Open igniter

• Shorted booster coil

• Open wiring

• Bad motor switch ( Neutral supply)

• No power from control ( L1 supply)

Igniter glows - No gas ignition

If the igniter heats up but the main burner ame is not ignited,

remove power and using an ohmmeter, check the following:

• Open secondary coil

• Open holding coil

• Open wire harness

• Stuck ame sensor (Stuck closed)

The gas is ignited but

the ame goes out

If a normal ignition takes place and after a short while the ame

goes out, check for the following:

• Radiant sensor contacts opening prematurely.

• Weak gas valve coil may open when stressed by higher Temps.

• Weak Hi-Limit

• Poor venting

• Bad drum seals

Improper drying clothes wrinkled Rough texture long dry time

• Lint lter is not clean.

• Restriction in exhaust.

• Outside exhaust hood damper door stuck closed.

• Exhaust too long, too many elbows, ex 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 insufcient spin out by washer.

Noisy and/Or Vibration

• Thumping Check for loose tumbler bafe, 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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COMPONENT TESTING PROCEDURES

Component Electrical Testing (with ohmmeter)

●

Thermistor resistance 10K Ω @ 25°C 77°F

(2P-Blue & Red wire)

●

Thermostat 1 resistance < 1Ω (White &

Yellow wire)

● Belt Cut-off S/W

- Lever open: Resistance value < 1Ω

- Lever push: Resistance value

●

Thermostat 3 resistance < 1Ω (Red &

Black wire)

-If resistance is innity, replace thermostat 3.

●

Thermostat 2 resistance < 1Ω (Blue &

Black wire)

-If resistance is innity, replace thermostat 2.

●

Heater resistance 10 Ω (Blue & Blue wire)

-If resistance is innity, replace Heater.

● Lamp resistance 80~100 Ω (Violet & gray)

Function 1M 2M 3M 5M 6M

Start

Run

Contacts

= Contact closed

● Measure resistance of the following terminal

1) Door switch knob: open

Terminal : “COM” - “NC” (1-3) : ∞ Ω Terminal : “COM” - “NO” (1-2) < 1Ω

2) Door switch push: On

Terminal : “COM” - “NC” (1-3) : ∞ Ω Terminal : “COM” - “NO” (1-2) < 1Ω

Centrifugal Switch (Motor)

2.88Ω between

Pin# 3 and 4

3.5Ω between

Pin# 4 and 5

WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

TROUBLE SHOOTING

● Motor (Electronic & GAS)

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WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

TROUBLE SHOOTING

GAS MODEL

Radiant Sensor(10RS)

Resistance value < 1 Ω If resistance is innite, replace Radiant

sensor

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 innity, replace Valve

Igniter(101D)

Resistance value 40~400 Ω If resistance is innite, replace Igniter

Thermostat (60T21 Hi-Limit)230F-50F

Resistance value < 1 Ω If resistance is innity, replace

Thermostat

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WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

TROUBLE SHOOTING

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

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WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless testing requires power.

TROUBLE SHOOTING

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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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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