Samsung DV50F9A7EV Manual

1
CLOTHES DRYER
Technical Information
CAUTION
All safety information must be follwed as provided in Service Manual of
DV50F9A6E(G)*/DV50F9A7E(G)*/DV50F9A8E(G)*..
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
Code No. : DC68-03171D_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(DV50F9A6E(G)*/DV50F9A7E(G)*/DV50F9A8E(G)*)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 Thermistor 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.
2E Electronic control problam
(OverVoltageError)
Check for:
- Check PCB and Wire harness.
- Check Power supply
-ReplacePCB
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
Continuous Run Mode:
1. PressMixedLoadBell+DryLevelfor7secduringPowerOnState(NormalUserMode).
2. OnceinContinuousRunMode,display“CC”for1secandthenumberofCyclefor1secand
the remaining time for 1 sec in turns.
3. ThepreviouscyclewillrestartduringContinuousRunModeuntilthemodeisdeactivated.
4. DuringContinuousRunMode,pressMixedLoadBell+DryLevelfor7secondstoreturnto
normal user mode.
Service Mode
Denition of Service Mode
- Dryer must be on before Service Mode can be entered.
- UponentryintoServiceMode,theSensorBarTouchDatawillbeshown(DefaultService
Mode).
How to Enter:
- To enter Service Mode, press Mixed Load Bell and Temp Keys for 3 seconds, until it sends out
a beeping sound.
-If pressing Mixed Load Bell + Temp Keys for 3 seconds in Service mode , it will return Normal
mode.
- Even though entering Service mode, the operating cycle will not be inuenced.
Sensor Bar Touch Data Mode
Denition of Sensor Bar Touch Data Mode:
- 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:
- WithPowerOnpressingMixedLoadBellandTempKeysfor3seconds
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:
- To enter cycle count mode press the Mixed Load Bell in Service Mode.
Software Version Mode
Denition of Software Version 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“U005”,U0meansmajorversion“U0”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.
Mixed Load Bell
+Dry Level 7 sec
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4
Data Display Mode
Denition of Temperature Display Mode:
- Display Mode 0 : Temperature data(Celsius)
- Display Mode 1 : Average Touch Sensor data for 1 minute
- Display Mode 2 : Average Temperature(Celsius) data for 1minute
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IDwillbeincreased.
- If pressing AdjustDown Key in this mode ,Display Mode ID will be decreased.
• Converting °C  °F
Celsius(°C) -30 -10 10 30 50 70 F =9/5C + 32
Fahrenheit(°F) -22 14 50 86 122 158
System Check Mode
Denition of System Check Mode:
- “t2”willdisplay.
- System Check Mode(t2 mode) Progress Function Performed Start/Pause
Motor(CW)RelayOnHeaterRelayOnHeaterRelayO,Motor(CW)RelayO
How to Enter:
- WhileinPowerO,pressingtheDryLevel+Powerkeyssimultaneouslywillputthedryerinto
the System Check 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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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 < 1Ω
- If resistance is innity, replace thermostat 3.

Thermostat 2 resistance < 1Ω
- 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:O
Terminal : “COM” - “NC” (1-3) : <1Ω
Terminal : “COM” - “NO” (1-2) : ∞ Ω
2) Doorswitch:On
Terminal : “COM” - “NC” (1-3) : ∞ Ω
Terminal : “COM” - “NO” (1-2) < 1Ω

BeltCut-oS/W
-Leveropen:Resistancevalue<1Ω
-Leverpush:Resistancevalue:∞Ω
VentSensing-ThermistorResistance
238.23K Ω @ 25℃77℉
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
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9
GAS MODEL
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about1.2KΩ
Valve1-3:Resistancevalueabout0.5KΩ
Valve4-5:Resistancevalueabout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 1 - Disconnect harness and test
BluewirePin3toRedwirePin6.
Approx10KΩat25°C/77°F
Cycling Thermistor 2 - Disconnect harness and test
Yellow wire Pin 2 to White wire Pin 7.
CN4Approx238.23KΩat 25 °C/77 °F
CN1
1. AC Power Port
2. Door Detection Sensor
3. Motor Switch Sensor
RY7
Heater Relay Switch
RY5
Motor Relay Switch
RY2 RY3 CN5
Steam Relay Switch
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