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LG DLE8377WM Training Manual
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LG DLE8377WM Training Manual

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See also: Service Manual , Owner's Manual
DISCOVERY DRYER
TRAINING MANUAL
CAUTION!
READ THIS MANUAL CAREFULLY
BEFORE DIAGNOSING OR SERVICING THIS PRODUCT.
www.LGEservice.com

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Summary of Contents for LG DLE8377WM

  • Page 1 www.LGEservice.com DISCOVERY DRYER TRAINING MANUAL CAUTION! READ THIS MANUAL CAREFULLY BEFORE DIAGNOSING OR SERVICING THIS PRODUCT.
  • Page 2 Customer Service (and Part Sales) (800) 243-0000 Technical Support (and Part Sales) (800) 847-7597 USA Website us.lgservice.com Customer Service Website us.lgservice.com B2B Service Website biz.lgservice.com LG CS Academy lgcsacademy.com Published April 2006 by LG Technical Support and Training...

  • Page 3: Regulatory Notices

    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.

  • Page 4: Table Of Contents

    DRYER Contents Regulatory Notices Contents Introduction Sensor Dry Manual Dry Gas Safety Page Specifications Accessories Installation (of accessories) Rack Stacking Kit Pedestal Modem and Monitor Electric Dryer Pigtail 4-wire Connection 3-wire Connection Gas Dryer Piping Dryer Cycle Chart Component Test Procedures Motor Diagram and Schematic Safety Switches Control and PCB Layout...
  • Page 5 DRYER Contents, continued Disassembly/Repair Top Cover Control Panel Front Cover and Door Door Reversal Tub Front Drum Assembly and Belt Lamp Vent Replacement (Rear to side exhaust) Filter Assembly and Moisture Sensor Back Cover Air Duct Rollers Blower and Housing Exploded Views Top Cover and Control Panel Cabinet and Door...

  • Page 6: Introduction

    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.

  • Page 7: Sensor Dry

    DRYER 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.
  • Page 8 DRYER 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.

  • Page 9: Specifications

    DRYER SPECIFICATIONS DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 9 of 60 TRAINING MANUAL...

  • Page 10: Accessories

    DRYER 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.

  • Page 11: Stacking Kit

    DRYER 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. Place the washer on a solid, even floor.
  • Page 12 DRYER INSTALLATION (Stacking Kit) continued Install the front rail of the stacking kit. Push the front rail back against the stops on the side brackets. Insert a screw to attach the front rail to the side bracket. Repeat step 7 for the other side. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 12 of 60...

  • Page 13: Pedestal

    DRYER INSTALLATION (Pedestal) For 27” Pedestals (Washer, Dryer, and Combo) Remove the pedestal, installation hardware, and instructions from the shipping container. 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.
  • Page 14 DRYER INSTALLATION (Pedestal) continued 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. 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.

  • Page 15: Modem And Monitor

    DRYER 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. 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.

  • Page 16: Electric Dryer

    DRYER 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.

  • Page 17: 3-Wire Connection

    DRYER 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.

  • Page 18: Electrical Connection

    DRYER 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.

  • Page 19: Gas Dryer

    DRYER GAS CONNECTION (Gas Dryer Only) CAUTION! (This warning applies to both natural gas and propane.) Gas is both flammable and explosive. Use caution when working with gas. In most locations, installing and connecting gas is restricted to properly trained and licensed persons.

  • Page 20: Dryer Cycle Chart

    DRYER DRYER CYCLE CHART * SENSOR DRY The dryness level is set by the customer. ** MANUAL DRY The temperature is set by the customer. The default settings can be overridden by the customer. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 20 of 60 TRAINING MANUAL...

  • Page 21: Component Testing Procedures

    DRYER COMPONENT TESTING PROCEDURES Testing the various components of the dryer is relatively simple. Most can be checked without major disassembly. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 21 of 60 TRAINING MANUAL...
  • Page 22 DRYER COMPONENT TESTING PROCEDURES continued DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 22 of 60 TRAINING MANUAL...
  • Page 23 DRYER COMPONENT TESTING PROCEDURES continued DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 23 of 60 TRAINING MANUAL...

  • Page 24: Motor Diagram And Schematic

    DRYER MOTOR DIAGRAM and SCHEMATIC To check the motor, turn the power off and allow the capacitor to discharge. The centrifugal switch serves as a safety device to turn off the fuel (gas or electricity) to the heater if the motor fails to rotate. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 24 of 60...

  • Page 25: Safety Switches

    DRYER SAFETY SWITCHES The centrifugal switch slides back and forth on the motor’s shaft to operate the contacts as shown in the previous diagram. This switch provides safety in the event the motor fails. When the motor is running, centrifugal force causes the weight (black wing in photo) to slide back toward the motor windings.

  • Page 26: Control And Pcb Layout

    DRYER DISPLAY PWB The display board is actually two boards connected by a ribbon cable. One board holds the selector knob and cycle indicator LEDs. The other holds the LCD display and adjustment buttons to override the pre-set cycle selections. The DLE7177WM board is shown below.
  • Page 27 DRYER MAIN PWB The main board includes the relays that operate electric heaters and gas valves. The DLE7177WM board is shown below. Other models vary slightly. The gas and electric models have a different main board. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 27 of 60 TRAINING MANUAL...

  • Page 28: Wiring Diagram

    DRYER Electric Dryer Wiring Diagram Gas Dryer Wiring Diagram DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 28 of 60 TRAINING MANUAL...

  • Page 29: Diagnostic Test

    DRYER DIAGNOSTIC TEST MODE The diagnostic test mode is for service testing only. Do not activate the heater manually with the door open or it will trip the thermostat attached to the heater. Dryer must be in standby mode. (Plugged in, turned off) Press and hold MORE TIME and LESS TIME, then press power.

  • Page 30: Test 1 - 120 V Ac Electrical Supply

    DRYER DIAGNOSTIC TEST PROCEDURES The following pages will assist in troubleshooting and diagnosing issues with the dryer. Each test will list the appropriate precautionary measures along with symptoms and the conditions under which the testing should be performed. TEST 1 – 120 V AC ELECTRICAL SUPPLY WARNING! Use insulated gloves to avoid electrical shock.
  • Page 31 DRYER WARNING! Use insulated gloves to avoid electrical shock. SYMPTOM! Check the TAB RELAY connections. CONDITION! Power on to dryer, controller connected. POWER CONNECTION CONNECTION STATUS (Electric) CONNECTION STATUS (Electric) DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 31 of 60 TRAINING MANUAL...
  • Page 32 DRYER If the power connection is reversed, the dryer will not operate and components can be damaged. CONNECTION STATUS REVERSED (Incorrect) (Electric) CONNECTION STATUS REVERSED (Incorrect) (Gas) DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 32 of 60 TRAINING MANUAL...

  • Page 33: Test 2 - Thermistor Test (Power Off)

    DRYER TEST 2 – Thermistor Test (Power Off) WARNING! Use insulated gloves to avoid electrical shock. SYMPTOM! tE1 and tE2 error codes occur during the test. Heater does not turn off. Significant difference between actual and sensed temperature. CONDITION! Power off. Table –...

  • Page 34: Test 3 - Motor Test

    DRYER TEST 3 – Motor Test WARNING! Discharge (see below) before measuring resistance. SYMPTOM! Motor, fan, and heater do not function. CONDITION! Turn power off, unplug dryer, and discharge by shorting line and neutral to ground at the end of the power cord. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 34 of 60...

  • Page 35: Test 4 - Moisture Sensor Test

    DRYER TEST 4 – Moisture Sensor Test WARNING! Discharge (see below) before measuring resistance. SYMPTOM! Dryness of clothing does not match set dry level. CONDITION! Turn power off, unplug dryer, and discharge by shorting line and neutral to ground at the end of the power cord. Measure resistance.

  • Page 36: Test 5 - Door Switch Test

    DRYER TEST 5 – Door Switch Test WARNING! Discharge before measuring resistance. SYMPTOM! Door opening not sensed (dryer runs with door open). CONDITION! Turn dryer off, unplug, discharge, and measure resistance. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 36 of 60 TRAINING MANUAL...

  • Page 37: Test 6 - Heater Switch Test (Electric Dryer)

    DRYER TEST 6 – Heater Switch (Electric Dryer Only) WARNING! Discharge before measuring resistance. SYMPTOM! Heater does not operate. CONDITION! Turn power off, unplug, discharge, and measure resistance. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 37 of 60 TRAINING MANUAL...

  • Page 38: Test 7 - Gas Valve Test (Gas Dryer)

    DRYER TEST 7 – Gas Valve Test (Gas Dryer Only) WARNING! Use insulated gloves to avoid electrical shock. SYMPTOM! Heater does not operate. CONDITION! Power on. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 38 of 60 TRAINING MANUAL...

  • Page 39: Test 8 - Semiconductor Test

    DRYER TEST 8 – Semiconductor Test (Sensor) WARNING! Discharge before measuring resistance. SYMPTOM! Resistance is not 300Ω ± 20Ω CONDITION! Turn power off, unplug, discharge, and measure resistance. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 39 of 60 TRAINING MANUAL...

  • Page 40: Gas Conversion (Natural To Propane)

    DRYER GAS CONVERSION (Natural to Propane) WARNING! Improper installation and/or adjustment of orifices and gas valves can result in fire, explosion, and suffocation. Installation and adjustment should be performed ONLY by a trained, licensed, and certified gasfitter. NOTICE! The dryer is shipped from the factory equipped for natural gas. 1.

  • Page 41: Orifice

    DRYER GAS CONVERSION (Natural to Propane) continued Replace the orifice. (See photo, previous page.] You’ll have to remove the top plate and front cover to change the orifice. Installing the correct orifice is critical! This should be performed ONLY by trained, licensed, and certified service personnel.

  • Page 42: Gas Valve Operation

    DRYER GAS VALVE OPERATION The gas valve is a two-stage valve. When the ignition sequence begins, the igniter is turned on and valve one opens. When the igniter reaches 370° F (188° C), the igniter is turned off and valve two is opened. If the flame detector does not detect ignition, valve two is closed and the process is restarted.

  • Page 43: Disassembly/Repair

    DRYER DISASSEMBLY and REPAIR INSTRUCTIONS TOP PLATE Remove three screws along the back of the top (cover) plate. Slide the top plate backward. Lift the top plate off and set it aside. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 43 of 60 TRAINING MANUAL...

  • Page 44: Control Panel

    DRYER CONTROL PANEL Remove two screws, one on each corner of the control panel. Disconnect all connectors. NOTE: The connectors are all different to prevent misassembly. Pull the control panel upward, then forward. Be sure to disengage all the plastic tabs along the top.

  • Page 45: Front Cover And Door

    DRYER FRONT CABINET Remove the top plate. Remove the control panel. Remove the door, if necessary for the repair. Remove two screws in the bottom of the door opening. Remove four screws from the top of the front cabinet. Tilt the front away from the dryer and disconnect the door switch wire harness.

  • Page 46: Tub Front

    DRYER TUB FRONT Remove the top plate. Remove the front cabinet. Disconnect the door lamp (top) and electrode sensor (bottom). Remove the four screws holding the front assembly. Lift the tub front up and away. DRUM, BELT, and PULLEY Remove the drum front. Reach in and remove the belt from the motor and pulley.

  • Page 47: Lamp

    DRYER DRUM LAMP The drum light can usually be changed without a major disassembly, unless the bulb is frozen in the socket. If the bulb can’t be changed using this procedure, you’ll have to remove the front cover and the lampholder to get to the socket. Open the door.

  • Page 48: Vent Replacement (Rear To Side Exhaust)

    DRYER VENT REPLACEMENT Use the VENT KIT to change the exhaust direction. (Part # 383EEL9001B) On the back of the dryer, remove the screw securing the exhaust duct. (A) Remove the knockout on the left, right*, or bottom, as necessary. * Right vent option not available on gas dryers due to internal piping interference.

  • Page 49: Filter Assembly And Moisture Sensor

    DRYER FILTER ASSEMBLY and MOISTURE SENSOR Remove the lint filter. Remove three screws holding the cover grid. Remove the cover grid. Disconnect the electrode sensors. BACK COVER Remove the top plate. Remove the front cover. Remove the tub front. Remove the drum. Remove 7 screws.

  • Page 50: Air Duct

    DRYER AIR DUCT Remove the top plate. Remove the front cover. Remove the filter. Remove 2 screws at the top of the air duct. Remove the air duct. DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 50 of 60 TRAINING MANUAL...

  • Page 51: Rollers

    DRYER ROLLERS Remove the top plate. Remove the front cover. Remove the tub front. Remove the drum (if replacing the back rollers.) Use an open-end wrench to remove and replace the shaft and roller. NOTE: If the shaft is OK and you are replacing only the roller, you can squeeze the triangular retainer to remove and replace the roller without removing the...

  • Page 52: Blower And Housing

    DRYER BLOWER HOUSING Remove the top plate. Remove the front cover. Remove the tub front. Remove the drum. Remove the two screws and the cover on the air guide. Remove the nut and washer on the blower shaft. Remove the fan from the shaft. Press down the hooked end of the clamps and remove them.

  • Page 53: Exploded Views

    DRYER EXPLODED VIEW (Control Panel and Top Plate Assembly) DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 53 of 60 TRAINING MANUAL...

  • Page 54: Cabinet And Door

    DRYER EXPLODED VIEW (Cabinet and Door Assembly) DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 54 of 60 TRAINING MANUAL...

  • Page 55: Drum And Motor (Electric Dryer)

    DRYER EXPLODED VIEW (Drum and Motor – Electric Model) DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 55 of 60 TRAINING MANUAL...

  • Page 56: Drum And Motor (Gas Dryer)

    DRYER EXPLODED VIEW (Drum and Motor – Gas Model) DLE8377xM/DLG8388xM DLE7177WM/DLE7188WM Page 56 of 60 TRAINING MANUAL...

  • Page 57: Parts List

    DRYER PARTS LIST DLE8377NM DLE8377WM DLG8388NM DLG8388WM Description Part No Part No Part No Part No *001 Owner's Manual 3829EL3009B 3829EL3009B 3829EL3009B 3829EL3009B *002 Box, Carton 3890EZ3613A 3890EZ3613A 3890EZ3613A 3890EZ3613A *004 Manual, Service 3828EL3005D 3828EL3005D 3828EL3005D 3828EL3005D A110 Panel Assembly, Control...
  • Page 58 DRYER DLE8377NM DLE8377WM DLG8388NM DLG8388WM Description Part No Part No Part No Part No K140 Gasket 4036EL3001A 4036EL3001A 4036EL3001A 4036EL3001A K210 Tub, Drum (Front) 3044EL1001A 3044EL1001A 3044EL1001B 3044EL1001B K221 Lamp, Incand., Assembly 6913EL3002C 6913EL3002C 6913EL3002C 6913EL3002C K222 Lamp, Incandescent, Bulb...
  • Page 59 (this page intentionally blank)
  • Page 60 © 2006 LG Electronics, Inc. Printed in the USA...

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