lg DLE8377WM, DLG8388WM, DLE8377NM, DLG8388NM, DLE7177WM Service Manual

www.LGEservice.com

DISCOVERY DRYER TRAINING MANUAL

CAUTION!

READ THIS MANUAL CAREFULLY

BEFORE DIAGNOSING OR SERVICING THIS PRODUCT.

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Published April 2006 by LG Technical Support and Training

DRYER

IMPORTANT SAFETY NOTICE

The information in this training manual is intended for use by persons possessing an adequate background in electrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major appliance, personal injury and property damage can result. The manufacturer or seller maintains no liability for the interpretation of this information, nor can it assume any liability in conjunction with its use. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury. If wires, screws, clips, straps, nuts, or washers used to complete a ground path are removed for service, they must be returned to their original positions and properly fastened.

CAUTION

To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for diagnosis or test purposes, disconnect the power immediately after performing the necessary checks. Also be aware that many household appliances present a weight hazard. At least two people should be involved in the installation or servicing of such devices. Failure to consider the weight of an appliance could result in physical injury.

ESD NOTICE

Some of the electronic components in appliances are electrostatic discharge (ESD) sensitive. ESD can weaken or damage the electronics in these appliances in a manner that renders them inoperative or reduces the time until their next failure. Connect an ESD wrist strap to a ground connection point or unpainted metal in the appliance. Alternatively, you can touch your finger repeatedly to a ground connection point or unpainted metal in the appliance. Before removing a replacement part from its package, touch the anti-static bag to a ground connection point or unpainted metal in the appliance. Handle the electronic control assembly by its edges only. When repackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.

REGULATORY INFORMATION

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 if the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation. This equipment generates, uses, and can radiate radio frequency energy, and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna; Increase the separation between the equipment and the receiver; Connect the equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the dealer or an experienced radio/TV technician for help.

COMPLIANCE

The responsible party for this device’s compliance is LG Electronics Alabama, Inc.; 201 James Record Road, Huntsville, AL, 35824.

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Contents
Regulatory Notices	3
Contents	4
Introduction	6
Sensor Dry	7
Manual Dry	7
Gas Safety Page	8
Specifications	9
Accessories	10
Installation (of accessories)	10
Rack	10
Stacking Kit	11
Pedestal	13
Modem and Monitor	15
Electric Dryer	16
Pigtail	16
4-wire Connection	16
3-wire Connection	17
Gas Dryer	19
Piping	19
Dryer Cycle Chart	20
Component Test Procedures	21
Motor Diagram and Schematic	22
Safety Switches	25
Control and PCB Layout	26
Wiring Diagram	28
Diagnostic Test	29
Test 1 – 120 V AC Electrical Supply	30
Test 2 – Thermistor Test (Power Off)	33
Test 3 – Motor Test	34
Test 4 – Moisture Sensor Test	35
Test 5 – Door Switch Test	36
Test 6 – Heater Switch Test (Electric Dryer)	37
Test 7 – Gas Valve Test (Gas Dryer)	38
Test 8 – Semiconductor Test	39
Gas Conversion (Natural to Propane)	40
Safety Warning	40
Orifice	41
Gas Valve Operation	42
Flow Chart	42
Ignition Sequence	42

	continued on next page Æ
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Contents, continued

Disassembly/Repair	43
Top Cover	43
Control Panel	44
Front Cover and Door	45
Door Reversal	45
Tub Front	46
Drum Assembly and Belt	46
Lamp	47
Vent Replacement (Rear to side exhaust)	48
Filter Assembly and Moisture Sensor	49
Back Cover	49
Air Duct	50
Rollers	51
Blower and Housing	52
Exploded Views	53
Top Cover and Control Panel	53
Cabinet and Door	54
Drum and Motor (Electric Dryer)	55
Drum and Motor (Gas Dryer)	56
Parts List	57

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DRYER

INTRODUCTION

The DISCOVERY dryer is very similar to other LG dryers with the exception of the LCD display on the control panel. The LCD display shows all the information formerly indicated by LEDs but also allows for scrolling instruction.

When a cycle is selected, the options are preset. They can be overridden by changing them using the option buttons.

Pressing the buttons cycles through the available options. If an option is not available for a particular cycle, it is grayed out or not available for selection. For example, the EXTRA HOT wash is not available for the DELICATE cycle.

The interior components remain the same: motor, belt, drum, and heat source (gas or electric). The gas model can be refitted with an orifice to allow the use of propane instead of natural gas. All such conversions and adjustments should be performed by a licensed and certified gasfitter.

The DISCOVERY model also has an additional sensor in the exhaust stream to detect the moisture level more accurately for better drying results.

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Models DLE7177WM and DLG7188WM use the LED indicator panel instead of the newer LCD. The only difference is the type of display. The dryers function identically. The main and display PCB (Printed Circuit Board) will carry a different part number depending upon the type of display. Always order parts by model number and serial number to ensure receiving the correct parts.

The drying cycle is shown in the left window and the time remaining is show in the right. Feature selections like DRY LEVEL and BEEPER volume are indicated by LEDs on the panel.

The DISCOVERY line of dryers feature enhanced sensor drying. In addition to the drying sensor in the tub near the filter, there is an additional sensor in the exhaust stream to ensure the correct level of dryness is determined, from damp dry to very dry. The dryer can also be set manually to dry at a particular heat level and for a specified time.

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SAFETY

Check the local laws and regulations concerning the installation and connection of gas. In most localities, it is illegal to connect gas piping, re-jet or adjust burners, or repair gas-fired equipment unless you are licensed and certified so to do. It is the servicer’s responsibility to comply with all such regulation.

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SPECIFICATIONS

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ACCESSORIES

DRYING RACK

STACKING KIT

PEDESTAL

The DRYING RACK is used to dry items that should not be tumbled, like sweaters, tennis shoes, etc. It should be removed and stored when not in use. The rack is included with the dryer. (See installation procedure, page xx.)

The STACKING KIT is used to stack a dryer on top of a matching washer. (NEVER put a washer on top of a dryer!) The stacking kit should not be used in situation where there is the possibility of excessive vibration and movement of the washer, such as in a mobile home or an upper floor of a frame structure. The stacking kit is available as an optional purchase. (See installation procedure, page 11.)

The PEDESTAL can be used under either the washer or the dryer. It is possible to stack a washer and dryer on a pedestal, but the dryer controls may be difficult to reach and the possibility of vibration and movement is greater. The pedestal is available as an optional purchase. (See installation procedure, page 13.)

Pedestals are available in heights of 7¼” and 13”.

INSTALLATION (RACK)

It’s simple!

Open the dryer door.

Put the rack in place.

Select RACK DRY (2nd button on right)

Press START.

Be sure the front of the rack is properly situated in the notches on either side of the filter. The back should rest on the drum and allow the drum to rotate.

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INSTALLATION (Stacking Kit)

WARNING! Do not attempt this alone! At least two people are required to lift the dryer and place it properly on top of the washer. Failure to observe this warning could result in serious physical injury and damage to the appliances.

1. Place the washer on a solid, even floor. If you plan to use a pedestal, install it now before going any further.

2. Peel the protective paper from the adhesive tape on the side bracket.

3. Fit the side bracket firmly to the top plate using the adhesive tape, as shown in the drawing.

4. Secure the bracket to the top plate using a screw, as shown.

Repeat steps 2, 3, and 4 for the other side.

5. Level the dryer on a firm solid floor and lock down the adjusters before placing it on top of the washer. (See page xx.)

Lift the dryer on top of the washer it toward the front of the washer, as shown.

Slide the dryer all the way back to the stop on the rail.

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INSTALLATION (Stacking Kit) continued

6. Install the front rail of the stacking kit. Push the front rail back against the stops on the side brackets.

7. Insert a screw to attach the front rail to the side bracket.

Repeat step 7 for the other side.

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DRYER

INSTALLATION (Pedestal)

For 27” Pedestals

(Washer, Dryer, and Combo)

1. Remove the pedestal, installation hardware, and instructions from the shipping container.

2. Level the pedestal on a solid, flat, level floor. Lock down the rear adjusters, but leave the front ones free for now.

Set the dryer on the pedestal and level it. Level it and lock down all four adjusters on the dryer.

Note which holes are for the washer and which are for the

REAR FRONT dryer. If you are stacking the appliances, the washer should

be on the bottom.

3. Remove the protective paper from the adhesive surface of the bracket.

Be particularly careful, because when this adhesive makes contact, there is no adjustment possible.

NOTE: Some kits include two sets of brackets (curved for the dryer and flat (shown) for the washer.) Use the correct bracket for your application.

(See next page.)

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INSTALLATION (Pedestal) continued

4. Holding the adhesive part of the bracket away from the dryer, insert the screws and get them started.

Press the bracket onto the dryer and tighten the screws.

5. Press the brackets onto the sides of the dryer and rub the brackets from side to side to ensure the total adhesive area is attached completely.

6. Tighten all the screws securely.

7. Lower each leg of the dryer onefourth turn with the adjusting wrench to put a little pressure between the dryer and pedestal to prevent any motion and rattling.

8. Push the dryer into place.

9. Check the level and adjust the front legs of the pedestal as necessary. Then lock down the adjusters.

The pedestal kit includes the mounting plates (with adhesive covered by paper) and the screws to attach the plates. Remember, some pedestal kits come with two sets of brackets. The flat tops are for washers; the curved tops

(shown) are for dryers. Use the correct brackets for your application.

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INSTALLATION (Modem and Monitor)

REMOTE MONITOR

The monitor plugs in to any 110 Volt outlet in the home. It receives its data signal via the power lines.

1. Be sure the dryer is unplugged.

Remove the modem cover.

Save the cover for future use; in the event you must remove the modem, you can replace the cover.

2. Attach the modem to the socket with the screws provided.

3. Plug the monitor’s power cord in an outlet where you can observe it easily. Use the stand or the wall mount bracket.

4. Press and hold the button until the display shows SET.

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ELECTRICAL CONNECTION (Electric Dryer Only)

PIGTAIL INSTALLATION

Install the appropriate power cord for the outlet available. Grounding through the neutral conductor is prohibited in new branch-circuits, mobile homes, recreational vehicles, and where prohibited by local code.

4-wire Connection

The 4-wire receptacle looks like this.

Power cord with spade terminals.

Power cord with ring terminals.

Install a strain relief on the power cord.

Then connect the terminals to the terminal block, matching the wire colors.

A. Ground screw on chassis

B. Green wire from power cord

C. Strain relief

D. Neutral screw on terminal block

E. Terminal block

F. Neutral wire from power cord

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ELECTRICAL CONNECTION (Electric Dryer Only) continued

3-wire Connection

The 3-wire receptacle looks like this.

Power cord with spade terminals.

Power cord with ring terminals.

Install a strain relief on the power cord.

Then connect the terminals to the terminal block, matching the wire colors. Add a wire to connect the chassis ground to neutral.

A. Ground screw on chassis

B. Green wire from power cord

C. Strain relief

D. Neutral screw on terminal block

E. Ground-to-neutral connection

F. Neutral wire from power cord

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ELECTRICAL CONNECTION (Electric Dryer Only) continued

Be sure to tighten all screws firmly, but do not strip them or distort the contact area.

Be sure to install a strain relief on the power cord.

Replace the terminal block cover by inserting the tabs into the slots and letting them slide down to engage.

Fold it over to the back of the dryer so it covers the access to the terminal block. Be sure no wires are exposed or could touch any metal surface.

Secure the cover with a screw.

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