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-0ꢀ_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.
TEST MODE
Continuous Run Mode
Continuous Run Mode:
ꢀ. 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
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 “Uꢀ05”, U0 means major version “vꢀ“ 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.
ꢀ) 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
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).
ꢀ
Will Not Start or Run • 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.
Motor runs/ tumbler
2
3
• Idler tension spring too weak or stretched.
will not turn
• Idler pulley jammed or stuck.
• Lint buildup around drive motor.
Runs a few minutes
and then stops
• 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.
Blows fuses or trips
circuit breaker
4
5
• 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.
Blows fuses or trips
circuit breaker
(Gas Model)
• 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.
Will not heat
(motor runs)
6
7
• 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:
Will Not Dry Gas
Model Poor Gas
Ignition
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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.
If the igniter does not heat up, remove power and using an
ohmmeter, check the following:
• Open flame sensor
The igniter does not
glow
• Open igniter
• Shorted booster coil
• Open wiring
• Bad motor switch ( Neutral supply)
• No power from control ( Lꢀ supply)
8
9
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
ignition
• Open holding coil
• 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
ꢀ0
Temps.
the flame goes out
• Weak Hi-Limit
• Poor venting
• Bad drum seals
• 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.
Improper drying
clothes wrinkled
Rough texture
long dry time
ꢀꢀ
• 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 posi-
tion or worn tumbler front bearings.
Noisy and/Or
Vibration
ꢀ2
• 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
Component Electrical Testing (with ohmmeter)
● Thermistor resistance 10K Ω @ 25°C 77°F
(2P-Blue & Red wire)
- Lever open: Resistance value < 1Ω
- Lever push: Resistance value
● Thermostat 1 resistance < 1Ω (White &
Yellow wire)
● Thermostat 3 resistance < 1Ω (Red &
Black wire)
● Lamp resistance 80~100 Ω
(Violet & gray)
-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.
● Motor (Electronic & GAS)
Contacts
Function 1M 2M 3M
5M 6M
Start
Run
= Contact closed
● Measure resistance of the following terminal
ꢀ) Door switch knob: open
Terminal : “COM” - “NC” (1-3) : ∞ Ω
Terminal : “COM” - “NO” (1-2) < 1Ω
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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2008-06-25 ¿ÀÈÄ 5:24:26
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)
Radiant Sensor(10RS)
Resistance value < 1 Ω
If resistance is infinite, replace Radiant
sensor
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
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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2008-06-25 ¿ÀÈÄ 5:24:27
TROUBLE SHOOTING
WARNING
To avoid risk of electrical shock, personal injury or death; disconnect power to dryer
before servicing, unless testing requires power.
CN1
RY5
RY6
ꢀ. AC Power Port
2. AC Power Off Detection
Sensor
- Motor Relay Switch
- Heater Relay Switch
3. Door Detection Sensor
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
ꢀ0
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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” (ꢀ.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. (ꢀ.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
ꢀ2
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