Samsung DV431AEP/XEU Manual

1
CLOTHES DRYER
Technical Information
CAUTION
All safety information must be followed as provided in Service Manual of DV431A**/XEU.
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
Code No. : DC68-02365F-01
IMPORTANT SAFETY NOTICE – “For Technicians only” This service data sheet is intended for
use by persons having electrical, electronic, and mechanical experience and knowledge at a level
generally considered acceptable in the appliance repair trade. Any attempt to repair a major
appliance may result in personal injury and property damage. The manufacturer or seller cannot
be responsible, nor assume any liability for injury or damage of any kind arising from the use of
this data sheet.
• 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 (DV431A**/XEU) for detailed installation, operating, testing,
troubleshooting, and disassembly instructions.
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2
ERROR ITEMS AND DIAGNOSTIC CODES
An occurrence of an Error will make a sound of error melody for 5sec and continuously show one
of the Error Displays from the following errors.
Error Display Trigger Action Taken
tE The Termistor resistance is
very low or high.
Check for:
- Clogged lint screen.
- Restricted vent system.
- Check Thermistor resistance.
HE Invalid heating Temp in
running the dryer
Check for:
- Restricted vent system.
- Check Thermistor resistance.
dE Running the dryer with door
open
Check for:
- Close the door, and run the dryer.
- Loose or open wire terminals in
Door Sense circuit.
dF Invalid door state for more
than 256 milliseconds
Check for:
- Loose or open wire terminals in
Door Sense circuit.
bE2 Invalid state of key circuit
short for 30 secs
Check for:
- Display PCB key circuit short or
not.
FE Invalid power source
Frequency
Check for:
- Not using regular power source
frequency
- Invalid power frequency sense
circuit
AE Electronic Control Problem
(Communication Error)
Check for:
- Check PCB and Wire harness.
- Replace PCB.
Et Invalid state of Eeprom
communication
Check for :
- PCB with Eeprom circuit.
ALIGNMENT AND ADJUSTMENTS
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before
servicing, unless testing requires power.
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3
TEST MODE
Service Mode (DV431 only)
How to enter:
- To enter Service Mode , press Mixed Load Bell + Temp. Keys 3 seconds in normal mode until it
sends out a beeping sound.
- If pressing Mixed Load Bell + Temp. Keys in Service mode , it will return Normal mode.
- Even though entering Service mode, the operating cycle will not be inuenced.
Touch Sensor Data Display Mode
Denition of Touch Sensor Data Display Mode:
- This mode is default mode of entering service mode.
How to enter:
- With Power On pressing Mixed Load Bell +Temp(DV431) or Wrinkle Prevent + Temp(DV231)
for 3 seconds.
- This action will put the dryer into sensor bar touch data mode
- Dryer will display Sensor Bar data.
Cycle Count Mode
Denition of Cycle Count Mode:
- This mode is to bring up the total number of cycles that User have carried out.
How to enter:
- Press the Mixed Load Bell(DV431) orTime(DV231) key in Service Mode.
Software Revision Mode
Denition of Software Revision Mode:
- It is to retrieve its software version
How to enter:
At Service Mode, press Temp until it sends out a beeping sound
ex) In case of “U1 05”, U1 means major version “U1”, 05 means minor version “05”.
- If press Temp key In Software Version Mode, it will return Service Mode.
ALIGNMENT AND ADJUSTMENTS
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before
servicing, unless testing requires power.
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4
Continuous Run Mode
How to enter:
- Press Mixed Load Bell +Dry Level(DV431) or Wrinkle Prevent + Time(DV231) for 7 sec during
Power On State (normal user mode).
- Once in Continuous Run Mode, display “CC” for 1 sec and the remaining time for 2 sec in
turns.
- The previous cycle will restart during Continuous Run Mode until the mode is deactivated.
- During Continuous Run Mode, press Mixed Load Bell +Dry Level(DV431) or Wrinkle Prevent +
Time(DV231) for 7 seconds to go back to normal user mode.
Data Display Mode (DV431 only)
How to Enter:
- With Power On, press AdjustUp Key + AdjsutDown Key for 7 seconds until it sends out a
beeping sound .
- If not pressed any keys for 5 minutes, it will be set back from Data Display Mode
- If pressing AdjustUp Key in this mode, Display Mode will be incresed.
- If pressing AdjustDown Key in this mode, Display Mode will be decresed.
Denition of Data Display Mode:
- Display Mode 1 : Temperature data
- Display Mode 2 : Average Touch Sensor data for 1 minute
- Display Mode 3 : Average Temperature data for 1 minute
ALIGNMENT AND ADJUSTMENTS
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before
servicing, unless testing requires power.
Power On state
(Normal user mode)
Mixed Load Bell +Dry Level(DV431) or
Wrinkle Prevent + Time(DV231) 7 SEC
Continuous Run Mode
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5
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
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
dier 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.
ALIGNMENT AND ADJUSTMENTS
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before
servicing, unless testing requires power.
Please follow below instruction for the trouble diagnosis and parts replacement.
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6
No Problem What To Do
1Will 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 o or broken and Belt Cut-o Switch operates.
• Drive motor functional.
• Check motor winding resistance: 2.88ohms between pin #3 and
4, 3.5ohms between pin #4 and 5.
2Motor runs/ tumbler
will not turn
• Belt o or broken/damaged.
• Idler tension spring too weak or stretched.
• Idler pulley jammed or stuck.
3Runs 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.
4Blows 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.
5
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.
6Will 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.
7
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:
TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before
servicing, unless testing requires power.
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7
No Problem What To Do
8The 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)
9Igniter 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)
10 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
11
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 insucient spin out by washer.
12 Noisy and/Or
Vibration
• Thumping Check for loose tumbler ba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.
TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before
servicing, unless testing requires power.
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8
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
Component Electrical Testing (with ohmmeter)
 Thermistor resistance 10K Ω @ 25°C 77°F
 Thermostat 1 resistance < 1Ω

Thermostat 3 resistance < 1 Ω
- If resistance is innity, replace thermostat 3.

Thermostat 2 resistance < 1 Ω
- If resistance is innity, replace thermostat 2.
 Heater resistance 10 Ω
- If resistance is innity, replace Heater.

Measure resistance of the following terminal
1) Door switch : 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

Belt Cut-o S/W
- Lever open: Resistance value < 1
Ω
- Lever push: Resistance value : ∞ Ω
 Lamp resistance 80~100 Ω (Violet & gray)
 Motor (Electronic & GAS)
Contacts
 = Contact closed
Centrifugal Switch (Motor)
2.88Ω between
Pin# 3 and 4
3.5Ω between
Pin# 4 and 5
Function 1M 2M 3M 5M 6M
Start
Run
Thermostat 3
160 °C, 25A
thermal cut-off
Thermostat 2 Heater
127/99 °C, 25A
Hi-limit 240V/5300W
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9
GAS MODEL ONLY
TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before
servicing, unless testing requires power.
Radiant Sensor(10RS)
Resistance value < 1 Ω
If resistance is innite, replace Radiant sensor
Igniter(101D)
Resistance value 40~400 Ω
If resistance is innite, replace Igniter
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
Thermostat (60T21 Hi-Limit)230F-50F
Resistance value < 1 Ω
If resistance is innity, replace Thermostat
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10
TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before
servicing, unless testing requires power.
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 Thermistor - 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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