Samsung DV338 series Manual

1
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.
Technical_information-02365B.ind1 1 2008-06-25 ¿ÀÈÄ 5:24:21

2
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
tS The Thermistor
resistance is very low or
high.
Check for :
- Clogged lint screen
- Restricted vent system.
- Check Thermistor resistance.
tO
dO 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 state for more
than 256 milliseconds
Check for :
- Loose or open wire terminals
in Door
sense circuit.
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 exces-
sively
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
FE Invalid power source
Frequency
Check for :
- Not using regular power
source frequency
- Invalid power frequency sense
circuit
ERROR ITEMS AND DIAGNOSTIC CODES
Technical_information-02365B.ind2 2 2008-06-25 ¿ÀÈÄ 5:24:23

3
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 remain-
ing 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
Technical_information-02365B.ind3 3 2008-06-25 ¿ÀÈÄ 5:24:23

4
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)
Technical_information-02365B.ind4 4 2008-06-25 ¿ÀÈÄ 5:24:23

5
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.
Technical_information-02365B.ind5 5 2008-06-25 ¿ÀÈÄ 5:24:24

6
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.
2Motor runs/ tumbler
will not turn
• Belt off 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 am-
perages 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:
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
TROUBLE SHOOTING
Technical_information-02365B.ind6 6 2008-06-25 ¿ÀÈÄ 5:24:24

7
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
TROUBLE SHOOTING
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 insufcient spin out by washer.
12 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 posi-
tion 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.
Technical_information-02365B.ind7 7 2008-06-25 ¿ÀÈÄ 5:24:24

8
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)
Technical_information-02365B.ind8 8 2008-06-25 ¿ÀÈÄ 5:24:26

9
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
Technical_information-02365B.ind9 9 2008-06-25 ¿ÀÈÄ 5:24:27

10
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
Technical_information-02365B.ind10 10 2008-06-25 ¿ÀÈÄ 5:24:30