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COMBO TRAINING

WM3677HWWasher/Dryer Combo

WM3677HW

Similarities and Differences

While there are some similarities between regular (convection) dryers and the condenser dryer incorporated into the combo, many of the repair principles remain the same. These similarities and differences will be detailed in subsequent slides.

Conventional dryers use a large heating element and forced air to dry the clothes. Moisture from the laundry is exhausted to the outdoors with the airflow.

The condenser dryer in the COMBO works on a different principal. The moisture from the laundry is condensed from the airstream and air is recirculated instead of being exhausted. This condensed moisture is then pumped from the combo like wastewater.

The advantages are that no exhaust vent is required and most ventilation restrictions do not apply to the combo. There is lower heat, resulting in less damage to clothing. The disadvantage is that the drying cycle takes longer than a conventional dryer.

Introduction

WM3677HW

COMBO can be used as a Washer or Dryer ONLYBasically features are the same for the washer

Only ½ wash loads are recommended when dryingDryer has NO vent – Air is recirculated over the element and drum. Water is used to cool the duct assembly to condense moisture removed from the clothes. Drain pump is activated every 30 seconds to remove water. Three thermistors control the water valve and Sensor DRY.

It uses water to remove moisture. Drying time is extra long. - 120 VAC

Keynotes & Features

WM3677HW

Air is blown over the Heating Element by the Blower assembly Heated Air passes the operating thermistor and through the tubMoist Warm Air enters the return air ductAir Temperature Difference is sensed by the Top & Bottom Thermistors

This is used during Sensor DryWater Inlet Valve is energized approx. on 30 seconds off 15 seconds when

the sensor temp is near same. Valve is energized for longer periods at the beginning of the dry cycle

Water COOLS the return duct causing moisture in the air to condenseDrain Pump is energized every 30 seconds, approx. 10 seconds, pumping

approx. 4 oz. of waterEstimating a 3 hour drying cycle = 8 oz. every minute = 10 gallons of water

Dry Cycle

WM3677HW

Disclaimer

Every effort has been made to provide the most accurate and up-to-date training in the industry. Sometimes changes occur during the model year or production run. This presentation was accurate at the time of its creation. The most recent version of this presentation and its accompanying manual will be available on LG CS Academy.

In providing this training to our servicers, we assume they are reasonably trained and experienced in the repair of electronics and appliances, and accept no liability for injury or accident during the course of the repair.

Introduction

WM3677HW

Safety Precautions

If, in the course of servicing, grounding wires, screws, straps,clips, nuts, or washers that are used in completing a path to ground are removed, these must be properly fastened to their original position. The power cord is equipped with a grounding lead. Do not tamper with the power cord and do not use an extension cord with the COMBO.

• The same precautions that apply to servicing ordinary appliances should be observed.

• Before attempting an installation or any service procedure, read and be very familiar with the COMBO’s service manual.

• Do not install or store the COMBO in a location where it is exposed to the weather.

Introduction

WM3677HW

Safety Precautions

• Never launder articles of clothing that have been soaked or spotted with flammable liquids. These liquids may include, but are not limited to, gasoline, kerosene, cleaning solvents, and cooking oil. These can emit explosive vapors or react chemically to cause a fire.

• Never add flammable substances to the COMBO. These substances can emit explosive vapors, even in the lower heat that a combo produces.

Introduction

WM3677HW

• DO NOT use an extension cord or an adapter with this washer.

• DO NOT tamper with the power cord.

• DO NOT use the combo with a power socket that does not meet local requirements or the requirements of the washer.

• DO NOT ground to a gas pipe.

• Before attempting an installation or any service procedure, read and be very familiar with the combo’s service manual.

• DO NOT install or store the combo in a location where it is exposed to the weather.

Introduction

WM3677HW

Safety Precautions

• If the COMBO needs to be removed from service, detach the door from the COMBO to prevent small children from being trapped inside. Also, remove and destroy the unit’s power cord.

• At any time that the COMBO is opened for service, the servicer should take the opportunity to make sure that the inside of the cabinet is free of dust and lint.

Introduction

WM3677HW

• In certain conditions, hydrogen gas can accumulate in a hot water system that has not been used for two weeks or more. Hydrogen is explosive. Before servicing in such a situation, allow the hot water source(s) to run for several minutes to release any accumulated hydrogen.

Do not smoke or use an open flame while doing this!

Introduction

WM3677HW

• Turn the power OFF before servicing the COMBO.

• Use a helper to lift or move the COMBO. It weighs nearly 200 pounds.

• Follow ESD guidelines for handling parts and servicing.

• Do not remove the ground pin from the plug.

Introduction

WM3677HW

Combo Specs

The 2005 line-up of LG washers and dryers includes the COMBO.

The COMBO control panel is on the front.

WM3677HW, WM3677HBWhite, Black

3.22 ft3 (3.72 ft3 IEC) Max. 11 lbs. (8 kg)

120 VAC, 60 Hz, 5 AmpsWashing 280 WDrain Motor 80 WFan Motor 25 WDry Heater 1,200 WWash Heater 1,000 W

Drum Speed Wash 42 rpmSpin 0~1,200 rpm

4.5 - 145 psi (31 - 1000 kPa)Direct Drive

Yes57

27" W x 31" D (51" with door open) x 39" (H)201 lbs.9 hours46 rpm

1,200 rpmYes

Energy Consumption

Water PressureMotor

COMBOColor

Dry CapacityPower Supply

Spin Speed (Max. RPM)Water Circulation

Wash Capacity

WeightDelay WashWash Speed

Water HeaterTemperature SettingsCycle ProgramsSize

p6

Introduction

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p7

Serial Numbers

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• DIRECT DRIVE MOTOR

• TILTED DRUM and LARGE DOOR

• WATER CIRCULATION

• ROLLER JETS

• AUTOMATIC LOAD DETECTION

• BUILT-IN HEATER

• CHILD LOCK

p8

Features

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To get the best washing performance, optimal cycle time is determined by comparing the selected water temperature, sensing the current water temperature, and the amount of laundry.

p9

Fuzzy Logic

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DOOR LOCK

The door has an automatic, electrically operated lock system. When the machine is off or paused, the door can be opened by pulling it. When the machine is operating, the electric latch keeps the door closed.

The door cannot be opened:* When the COMBO is operating* When the power failed or the washer is unplugged (until the capacitor discharges and releases the lock)

* When the DOOR LOCK light is on* When the drum is still turning

DOOR LOCKED LAMP

The DOOR LOCK lamp lights:* When the COMBO is operating* When the water level sensor frequency is lower than 22.9 kHz* When the temperature inside the tub is over 45° C (113°F)

p9

Door Lock

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The recirculation pump circulates the water during most of the cycle. During the WASH cycle, it runs continuously for 3 minutes and then intermittently throughout the cycle. During the RINSE cycle, it runs continuously as soon as the appropriate amount of rinse water has been added. This recirculated water enters the drum at the top of the door at a small shower head. This spray not only keeps the window and gasket clean, it allows the clothes to be soaked with detergent more quickly and can be used to control an oversudsing event.

p10

Water Circulation

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p10

Parts Identification

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Main PCB Inlet ValvesWater Level Switch Mushroom Valves

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Heating Element Housing & Blower AssemblyElement, Safetystat, Fuselink

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RD&YL YL & BL BL & BLHeating Element Fuse link Safety Stat

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Air Inlet to Tub (Temperature Control)

Thermistor

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Blower Assembly Part#

4681ER1004ALeft Hand Threads

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DC Brushless -3 Pole Motor 12 VDC – 5 Wire Monitor (8 wires)

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Blower & Heater Duct Assembly

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Upper

Thermistor

Water Inlet

• Water inlet valve is energized approx. 80% of the time during the DRY cycle

• The Drain Pump is energized every 30 seconds for approx. 2-3 seconds pumping approx. 4 oz. (8 oz. every minute)

• Water is used to cool duct and remove lint

Inlet Hose

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5301FR1158J120 VAC

Heating Element

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Inlet Valve Assemblies 5220FR2006H-HOT 5220FR2008E-COLD

Prewash

Main Wash

Dryer

BleachHOT

Inlet Valve LayoutInlet Valve Assemblies 5220FR2006H-HOT 5220FR2008E-COLD

Ball SensorPart # 4811ER3001A

HOLE

BALL

CASE

TR (Sensing light)

DIODE (emitting light)

light

BL-RD 5VDC Constant

BL-YL 5VDC Ball NORMAL

BL-YL 0VDC Ball off seat

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BALL SENSOR is located Bottom Rear of CabinetNote: Only in circuit First few minutes of spin

Tub Tab

Ball Sensor Tab

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HOLE

BALL

CASE

TR (Sensing light)


light

The BALL SENSOR is so named because it contains a small ball covering an even smaller hole. The ball rests so it blocks the light from the LED above from shining through the hole to the phototransistor below. If the sensor is shaken, the ball is moved temporarily from its resting place, allowing the light to trigger the phototransistor. This, in turn, causes the drum rotation to stop and then attempt to rebalance the load.

p53

Repair – Ball Sensor (Unbalance)

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p11

Back of COMBO

ACCESSORIES

Parts Identification

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Remove the shipping bolts AFTER the COMBO has been carried to the installation area.

Save the bolts in case the COMBO must be moved. (relocation, service, etc.)

Use the provided wrench to remove bolts and level the feet.

p12

Shipping Bolts

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Install the COMBO on a firm, flat surface.

Adjust the feet to level the COMBO.

p12

Installation

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Connect the water hoses and the drain hose.

Watch the stripes on the hoses (red for hot, blue for cold). It is critical to proper washing function.

Secure the drain hose in the pipe of sink.

p13

Installation

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p14

Control Panel

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p15

Program Chart (Washing)

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Dispenser

Siphon Box

The dispenser drawer is a multi-chambered reservoir that allows the user to add all the appropriate laundry additives before starting the cycle. It has a place for pre-wash detergent, main wash detergent, fabric softener, and bleach. Powdered or liquid detergents may be used, but softener and bleach must be liquids. The dispenser works by using various solenoids to apply water to different compartments.

The Siphon Box holds the liquid product until it is flooded. Then it dispenses the laundry additive into the stream filling the tub.

p16~17

Dispenser

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The dispenser works by directing water to flood various compartments. Note the main and pre-wash hoses enter at an angle. Operating them simultaneously causes water to dispense the softener. Water may also pass through the wash compartments, butsince the detergent has already been dispensed, it doesn’t matter.

p16

Dispenser

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The COMBO must be empty and off to enter TEST MODE.

1. Press and hold SPIN SPEED and SOIL LEVEL.

2. Press POWER.

3. Press START/PAUSE to cycle through the test modes.(See chart on next slide.)

Check the water level frequency. (Only by Test Mode)

p18

Test Mode

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p18

Test Mode

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Use this flow chart to test the COMBO after installation and after any repair or adjustment.

p19WM3677HW

• If you press START/PAUSE when an error code is displayed, theerror code will disappear and the COMBO will go into PAUSE status. (Exception: PE)

• In a case of PE, tE, or dE, if the error is not resolved within 20 seconds, the COMBO will power OFF.

• In the case of any other error code, if the error is not resolved within 4 minutes, the COMBO will power OFF.

• In the case of FE, the COMBO will not power off.

error code charts on subsequent slides

p20

Error Codes

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p20

Error Codes

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p21

Error Codes

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The following slides will aid in diagnosing and repairing COMBOs.

diagnostic charts on subsequent slides

Diagnosis and Check List

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Sometimes the customer will make a note of an error code to aid in diagnosing the problem. Follow the troubleshooting tree for a quick and easy diagnosis.

p22


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p24


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If one of these codes shows up, it means a definite service call.

p24


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continued on next slide

p25

Diagnosis – No Power

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continued from previous slide

p25

Diagnosis – No Power

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p26

Diagnosis – Vibration and Spin Noise

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If still unstable, adjust the feet to level the COMBO.

p26

Diagnosis – Vibration and Spin Noise

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p27

Diagnosis – No Water Supply

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p27

Diagnosis – Detergent Does Not Dispense

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p28

Diagnosis – Other Products Do Not Dispense

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p28

Diagnosis – Abnormal Sound or Noise

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p29

Diagnosis – Heating w/out Water

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p29

Diagnosis – Drain Malfunction

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p30

Diagnosis – Wash Heater Malfunction

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p30

Diagnosis – Overheating Water

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p31

Diagnosis – No Circulation

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p32

Diagnosis – Spin Malfunction

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p33

Diagnosis – dE Error Code

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p33

Diagnosis – dHE Error Code

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p34

Diagnosis – Dryer Fan Malfunction

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p34

Diagnosis – Dryer Heater Malfunction

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REMINDERS

• Always unplug the COMBO before opening the case or servicing it.

• Plug it in ONLY when necessary to perform testing. Some components may have up to 300 volts present.

• Drain the water from the COMBO if necessary to avoid spillage during a repair. Use a shallow pan and the drain hose on the front of the machine.

• Observe ESD precautions when handling electronic components.

Repair

WM3677HW

1. Remove the two screws on thetop of the back plate.

2. Slide the top plate backward and lift it, as shown.

3. Disconnect the Display PWB connectors. (3 connectors)

4. Remove the dispenser drawer.

5. Remove the two screws behindthe dispenser drawer.

6. Lift off the left side of the Control Panel and pull it out.

p35

Repair – Control Panel

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7. Remove the nine screws that secure the PWB.

8. Remove the PWB.

9. Reassembly is the reverse of these steps.

p35

Repair – Control Panel

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1. Disconnect the POWER connector and the SENSOR SWITCH assembly.

Remove the protective cover by lifting the plastic clips around the top and sides.

2. Disconnect all the connectors. Note that they are all different shapes and colors to prevent any mistakes upon replacement.

p36

Repair – Main PWB

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4. Remove the screw on the back.

5. Remove the MAIN PWB from the COMBO.(Slide it to the right and then lift.)


p36

Repair – Main PWB

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4. Remove the clamp and the large hose on the back of the dispenser.

5. Leave the small feed hoses on the dispenser.

1. Remove the top plate.

2. Remove the dispenser.

3. Remove the two screws from the front of the dispenser.

p37

Repair – Dispenser

WM3677HW

6. Disconnect the electrical connectors on the valves. The connector and wire colors will aid uponreassembly.

7. Remove the two screws that secure the cold watervalve assembly.


Valve Assembly Wire/Connector Chart(#) (Conn) (Wire)1 BLUE Yellow and Black (dryer water – cold)2 WHITE White and Black (main wash – cold)3 BLUE Gray and Black (pre-wash – cold)4 RED Blue and Black (hot input)5 WHITE Orange and Black (bleach – cold)

p37

Repair – Dispenser

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1. Unplug the power connection from the MAIN PWB.

2. Disconnect the two connectors from the power cord.

3. Remove the screw and ring connector for the ground. Replace the screw and any wires other than the ground for the noise filter.

4. Remove the screw securing the noise filter to the frame of the COMBO.

5. Replacement is the reverse of these steps.

p38

Repair – Noise Filter

WM3677HW

1. Remove the four screws from the top edge of thefront cabinet cover.

2. Remove the screw behind the filter cover.

3. Use a putty knife or a screwdriver on both sides (one at a time) of the filter cover and pull it out.

p39

Repair – Front Cabinet Cover

WM3677HW

4. Remove the screw that was hidden by the filter cover.

5. Open the COMBO door.

6. Use the special gasket pliers (part # 383EER4001A) to remove the gasket clamp/spring assembly.

p39


WM3677HW

7. Tilt out the cabinet cover.

8. Disconnect the door switch connector. (Don’t forget it when you put the cover back on!)

9. Lift the cabinet cover (front) off and set it aside where it will not fall or be damaged.

p40


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10. Remove the gasket clampon the tub side.

11. Remove the gasket.

p40


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1. Open the door.

2. Remove the seven screws from the hinge cover.

3. Put a flat screwdriver into the hinge opening andgently pry off the hingecover.

4. Remove the screw from thelower hinge pin.

5. Lift the door off the hinge.

BE CAREFUL! The door is heavy!

p41

Repair – Door

WM3677HW

1. Open the door.

2. Using the special pliers, remove the gasket clamp.

3. Remove the screws.

4. Pull the switch out and disconnect the wiring harness.

NOTE! Be sure you reconnect the wires when you replace the switch.

p41

Repair – Door Lock Switch Assembly

WM3677HW

The direct drive motor is a brushless DC motor built on the shaft of the drum. The elimination of belts and pulleys allows greater efficiency and reliability with less noise and vibration. The use of direct current allows the MICOM to control both the speed and the direction of rotation. There are no brushes to wear away as in a conventional electric motor. Unlike a more traditional brushless motor, the Direct Drive’s rotor surrounds the stator rather than being attached to it.

A Hall sensor reports the motor’s speed to the MICOM.

(see chart, next slide)

p42

Repair – Motor

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p42

Repair – Motor

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This motor is a 36-pole DC direct-drive motor. There are 12 magnets permanently attached to the rotor. Each magnet is opposite 3 poles of the stator at any given time. A Hall Effect sensor is mounted on the stator. It counts the poles of the magnets as the rotor turns to feedback the information to the controller. The motor controller can determine the direction and speed of rotation by adjusting the polarity and amplitude of the power applied to the stator.

(see picture, next slide)

p42

Repair – Motor

WM3677HW

p43

The Hall Effect sensor is easily removed and replaced. You’ll have to remove the rotor and stator to access the sensor. The rotor is splined and fits snugly on the drum’s shaft. When replacing the rotor, you will probably need a helper to hold the drum in place while you push therotor onto the shaft. Otherwise, the drum may move forward far enough to make it difficult to replace the bolt. The helper can also keep the drum from turning while you torque the bolt.

Repair – Motor

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CONNECTORFOR HALL EFFECT SENSOR

Check here before disassembling the motor.

p43

Repair – Motor

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1. Remove the back cover.

2. Remove the large bolt,17mm,from the center of the rotor.

3. Pull the rotor off the shaft. (You may have to wiggle it off. The shaft is splined.)

4. Remove the two screws from the tub bracket.

5. Remove the six bolts on the stator. 10mm

6. Remove the two electrical connectors on the stator.

p44

Repair – Motor

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The dampers (3) support the tub at the bottom; it is supported by two springs at the top and by the gasket on the front. Use special tool 383EER4003A.

1. Remove the damper hinge pins. (A special tool is available for this. Using a 5/8 deep well socket makes this easier by holding down the locking tab so the pin slides out easily. )

2. Replace the damper with a new part. Do not reuse a damper that has been disassembled.

p44

Repair – Motor

WM3677HW

Removing the tub requires that you remove the control panel and the front panel first. The front panel can be removed without removing the door.

(See previous pages for this procedure.)

When the front has been removed, it is easy to remove the tub. Remove the counterweights first to make this job easier. If you remove the counterweights, the motor will make the tub vary back-heavy. It should probably be removed with the weights. Otherwise, leave them both in place unless you must disassemble the tub.

Regardless, most of this procedure will require a helper.

Repair – Tub Removal and Repair

WM3677HW

1. Remove the bolts retaining the weights. (4 per weight)

2. Set the weights aside where they will not fall and break or cause injury.

3. Disconnect the wire lead to the thermistor.

4. Disconnect the wires on the heating element.

5. Remove the center boltsecuring the ground andthe element.

6. Pull the element outcarefully.

p45


WM3677HW

1. Remove the back cover. (Six screws.) Remember to drain the water if you haven’t already done it.

2. Remove the large bolt securing the rotor. This is much easier if there is an assistant available to hold the drum still on the inside while loosening the bolt. Extreme torque is not required when replacing the bolt;instead use a drop of Loctite®.

(M10-1.50X75 Long Bolt)

Use extreme caution! This partholds the motor’s permanentmagnets.

p46


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3. Disconnect the electricalconnections and grounding screw.

4. Remove the 6 bolts thathold the windings in place.

5. Disconnect the small hosethat attaches to the waterlevel sensor.

6. Disconnect the dryer duct water input hose.

p46


WM3677HW

7. Disconnect the drain hose on the back of the pump.

8. Disconnect the recirculatinghose at the top of the door gasket.

9. Disconnect the air vent hose.Be especially careful of the ball check valve. It must be replaced correctly to function properly.

10.Disconnect the vacuum break.

p46


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11.Remove the clamp where the dryer duct connects to the gasket. Separate the gasket and duct for when the tub comes out. This will allow the dryer assembly to remain in place when the drum comes out.

p47


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12. Remove the three dampers that support the tub.

13. Use special tool 383EER4003A.

BE CAUTIOUS! Separated dampers must be replaced.

Press in the tab on the small end and use the pliers to push the pin out. It is easiest to remove the bottom pin first. After removing the drum, the pin on the other end is easy to reach if it must be removed at all.

p47


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14. Open the spring clip on each side where the spring supports the tub.

15. Lift the springs out of the holders and take the tub out through the front of the COMBO.

(This may require a helper!)

p48


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16. Separate the tub halves to remove the drum. Remove the bolts around the circumference of the tub. Do not use a screwdriver or other sharp instrumentto pry the halves apart. (The bearing is visible in this photo.)

17. Do not disturb the seal (gasket) between the tub halves unless it requires replacement.

p48

Cavities in tub molding canbuild up detergent residue Odors from excessive soap


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18. Remove two bolts from the end on the spider of the drum. Then remove the screw on the outside of the drum. Squeeze the sides of the baffle slightly to release the positioning tabs.

p49


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19. Repairing or replacing the roller jet (baffle) requires removing the drum.

Remove the three screws that secure the inner part. Lift it out and remove the six glass roller balls.

The roller balls help turn the clothes over and the baffle fills up with water as the drum rotates, allowing it to shower that water out as it continues to rotate.

20. As always, reassembly is basically the reverse of these steps.

p49


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The water level detector switch monitors the water level and feeds this information to the MICOM. The sensor reads air pressure in an air chamber on the tub. The air pressure changes in relation to the depth of the water, moving a diaphragm in the switch. As the water level fluctuates, it raises or lowers the coil, which, in turn, changes the electric resonance of the oscillator circuit of which it is a part. As water level decreases, frequency increases. (e.g. A low water level may read 25.5kHz, while a high water level may read 21.4 kHz. These readings are approximate; washers in the field may vary slightly from these figures.)

To read the frequency while the COMBO is running, press and hold the SPIN SPEED and SOIL LEVEL buttons. The number on the display should be divided by 10 to obtain the frequency reading in kHz. A display of 254 would indicate a frequency of 25.4 kHz. The MICOMinterprets the frequency reading as one of eight levels, with one being the lowest water level and any level greater than eight indicating an overflow situation.

p50

Repair – Water Level Switch

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p50

Repair – Water Level Switch

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p51

The drain pump and the circulating pump are attached to either side of the filter housing. The drain pump is used to exhaust the water from the washer. The recirculating pump serves three purposes: it sprays water from the tub onto the laundry, creating a better saturation of detergent and better rinsing, it keeps the window clean, and it allows the customer to see water in the tub. The filter are between the pumps is not a lint filter in the traditional since. It serves to trap larger objects (keys, coins, buttons, etc.) that may find their way into the washer and protects the pumps from physical damage.

see diagram, next page

Repair – Pump

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1. Remove the cabinet.

2. Remove the pump hose, the bellows, and the circulation hose from the pump body.

3. Remove the two screws on the front plate.

4. Push the pump backward and lift it out. You can replace either pump without affecting the other one.

(See drawing.)

p51

Repair – Pump

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1. Remove the front cover.

2. Separate the connectors from the heater element.

3. Remove the nut (also the ground connection) and pull the heater out.

p52

Repair – Water Heater

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2. Disconnect the thermistor at the white connector.

3. Pull the thermistor out by the bracket.

p52

Repair – Thermistor

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2. Remove the heater from the tub.

3. Use a long bar or a wire to fish out anything that could be in the space there.

p52

Repair – Removal of Foreign Objects

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HOLE

BALL

CASE

TR (Sensing light)


light

The BALL SENSOR is so named because it contains a small ball covering an even smaller hole. The ball rests so it blocks the light from the LED above from shining through the hole to the phototransistor below. If the sensor is shaken, the ball is moved temporarily from its resting place, allowing the light to trigger the phototransistor. This, in turn, causes the drum rotation to stop and then attempt to rebalance the load.

p53


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The sensor assembly is bolted to the back of the washer near the bottom. The tub (surrounding the drum) is suspended on springs and dampers to allow some motion while the drum rotates.

However, if the load is out of balance and the tub moves too far out of place, a tab on the tub will strike the ball sensor.

p53


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1. Remove the four screws and the back cover.

2. Remove the single screw that secures the sensor (bottom right as you face the back of the COMBO.)

3. Separate the connector.

p54


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p55

The dryer portion of the COMBO is a condenser type dryer. It works on the principal that water condenses on a cool surface, similar to moisture collecting on a cold drink on a hot and humid summer day. A fan circulates air through the warming duct, drum, and condenser and over and over. The air is warmed because warmer air holds more moisture than cooler air and the heat causes more of the water to be evaporated from the laundry. The warm, moist air is directed through the condensing duct, which is cooled by a stream of cold water. This difference in temperature causes the moisture to precipitate in the condenser, where it and the cooling water are exhausted by the drain pump. The air, now dry, is passed over the warming element and through the laundry again as the process repeats itself. Because the air is recycled instead of exhausted, a vent and lint filter are not necessary for this type dryer.

NOTE: The Cooling Water rinses any Lint from the DUCT

Lint may accumulate in the Hose between the DUCT and PUMP

Dryer Repair

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p55

1. Remove the clamp screw and pull the boot off the dryer duct.

2. Disconnect all the electrical connections from the dryer duct.

3. Remove the two screws that secure the dryer fan housing to the back of the cabinet.

4. Lift the dryer fan housing and duct from the back end to clear the cabinet. The studs will pull free and you can remove the heater assembly.

Dryer Repair

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p55

5. Remove the two screws that hold the condenser duct to the back cabinet.

If you haven’t drained the water from the tub, this would be a good time to do it.

6. Disconnect the condenser boot on the tub end. (This will aid disassembly and reassembly because it is easier to reach.)

Dryer Repair

WM3677HW

p56

7. Release the clamp and remove the dryer water supply hose at the solenoid end.

Dryer Repair

WM3677HW

p56

8. Leave the hose in the duct end.

If this comes out, you must first fit the gasket into the hole in the duct, with the smaller side of the gasket facing the duct. Then insert the hose and rotate it 90° to lock it into place.

9. Dryer reassembly is the reverse of these steps.

Test and diagnostic procedures are available on pages 33~34 (slides 55~57) the training manual.

Dryer Repair

WM3677HW

p57

The main board controls all the functions of the COMBO. All the sensors in the machine report to the main board and the microprocessor makes all adjustments based on sensor input. There are no panel controls for such things as water level or washing time because these are determined via fuzzy logic based on the selected cycle and sensor input.

The main board is potted into a plastic case to protect it from vibration and water. It cannot be repaired and must be replaced as an assembly.

The connectors on the main board are color coded (See Wiring Diagram, next slide.) and are unique. It is not possible to cross the connectors. They are identifiable by pin count, conductor count, and shape, as shown on the diagram. Two of the less common color abbreviations on the diagram are SB (Sky Blue) and NA (Natural, which is cream or white.)

Main Board

WM3677HW

p57

Main Board

WM3677HW

p58

Wiring Diagram

WM3677HW

CABINET andCONTROLS

p59

Exploded View

WM3677HW

DRUM and RELATED PARTS

p60

Exploded View

WM3677HW

DISPENSER

p61

Exploded View

WM3677HW

DRYER COMPONENTS

p62

Exploded View

WM3677HW

Loc # Part No Description

M120 5209ER0002B DUCTASSEMBLY

M121 5200ER3001A PIPE

M130 5214ER4001C HOSE, INLET

M210 6931FR3108A THERMOSTAT ASSEMBLY

383EER4001A GASKET PLIER (SPECIAL TOOL)

393EER4003A DAMPER PLIER (SPECIAL TOOL)

383EER4004A GASKET PLIER (SPECIAL TOOL)

Full Parts List is in the SERVICE MANUAL and the TRAINING MANUAL

p63~66

Parts List

WM3677HW

(Outer)

(Inner)

master da presentation.ppt spring 2007diagramas.diagramasde.com/otros/wm3677_presentation.pdfcombo...

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