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LG DLEX7177WM Service Manual
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LG DLEX7177WM Service Manual

LG DLEX7177WM Service Manual

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ELECTRIC & GAS DRYER
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY IN ORDER TO
PROPERLY DIAGNOSE PROBLEMS AND TO SAFELY
PROVIDE QUALITY SERVICE ON THESE DRYERS.
MODEL : DLEX7177WM / DLEX8377WM
DLEX7177RM / DLEX8377NM
U.S.A. Website: http://us.lgservice.com
Canadian Website: http://lg.ca

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  • Page 1 U.S.A. Website: http://us.lgservice.com Canadian Website: http://lg.ca ELECTRIC & GAS DRYER SERVICE MANUAL CAUTION READ THIS MANUAL CAREFULLY IN ORDER TO PROPERLY DIAGNOSE PROBLEMS AND TO SAFELY PROVIDE QUALITY SERVICE ON THESE DRYERS. MODEL : DLEX7177WM / DLEX8377WM DLEX7177RM / DLEX8377NM...
  • Page 2 July. 2007 PRINTED IN KOREA P/No. : 3828EL3005N...
  • Page 3 IMPORTANT SAFETY NOTICE The information in this service guide is intended for use by individuals possessing skill and experience in electrical, electronic, and mechanical appliance repair. Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.

  • Page 4: Table Of Contents

    CONTENTS 1. SPECIFICATIONS ........................4 2. FEATURES AND BENEFITS ....................6 3. INSTALLATION INSTRUCTIONS ................... 6 4. DRYER CYCLE PROCESS ..................... 13 5. COMPONENT TESTING INFORMATION ................14 6. MOTOR DIAGRAM AND SCHEMATIC..................17 7. CONTROL LAYOUT ......................18 8. WIRING DIAGRAM ......................19 9. DIAGNOSTIC TEST ......................20 9-1.

  • Page 5: Specifications

    SPECIFICATIONS I Name: Electric and Gas Dryer I Power supply: Please refer to the rating label regarding detailed information. I Size: 27 X 29.9 X 38.7 (inch) I Dryer capacity: IEC 7.3 cu.ft. I Weight: 126(Ibs) ❋ Specifications are subject to change by manufacturer. I ACCESSORIES Dryer rack (1 each) Stacking kit (1 each)
  • Page 6 DLEX7177WM DLEX7177RM REMARK ITEM DLGX7188WM DLGX7188RM Color Blue White Candy Apple Red Material & Top Plate Porcelain Finish Door Trim Chromate POWER SUPPLY 120V/240V 60Hz (26A) MOTOR 250W (4.5A) AC 120V ELECTRICITY HEATER 5400W (22.5A) AC 240V (ELECTRIC MODEL) CONSUMPTION...

  • Page 7: Features And Benefits

    FEATURES AND BENEFITS INSTALLATION INSTRUCTIONS Dryer Rack Installation Instructions Put the dryer rack into Check and be sure that the Open the door. the drum front of the rack is properly Hold the dryer rack seated behind the lint filter. with both hands.
  • Page 8 Stacking Kit Installation Instructions To ensure safe and secure installation, please observe the instructions below. Secure the side bracket to the washer with WARNING a screw on the back of the bracket. Repeat Steps 2, 3, & 4 for the other side. Do not attempt this alone! At least two people are required to lift and position the dryer on top of a washing...
  • Page 9 Attach the double-faced tape of the bracket to the After removing the protective covering from the ※ ※ For washer, dryer, and combo LG 27” dryer as shown so the bent parts of the brackets adhesive surface, align the screw holes in the...
  • Page 10 Electric Dryer Only Review the following options to determine the appropriate electrical connection for your home: 4-wire receptacle 4-wire connection : Direct wire (NEMA type14-30R) Important : Grounding through the neutral conductor is prohibited for (1) new branch-circuit installations, (2) mobile homes, and (3) recreational vehicles, and Use the instructions under option 1 if your home (4) areas where local codes prohibit grounding through homehas a 4-wire receptacle (NEMA type 14-30R).
  • Page 11 3-wire connection : Direct wire Option 1: 4-wire connection with a Power supply cord. Important : Grounding through the neutral conductor is prohibited for (1) new branch-circuit installations, • lf your local codes or ordinances do not allow the (2) mobile homes, and (3) recreational vehicles, and use of a 3 wire connection, or you are installing (4) areas where local codes prohibit grounding through your dryer in a mobile home, you must use a 4-...
  • Page 12 Option 3: Optional 3-wire Option 2: 3-Wire Connection with connection. a Power Supply Cord • If your local codes or ordinances do not allow the lf your local codes or ordinances permit the connection of a frame-grounding conductor to the connection of a frame-grounding conductor to the neutral wire, use the instructions under this neutral wire, use these instructions.
  • Page 13 3-2. Connect Gas Supply Pipe (Gas Dryer ONLY) For further assistance, refer to section on Gas Requirements. 1. Make certain your dryer is equipped for use with the 3. Connect to gas supply pipe using a new flexible type of gas in your laundry room. Dryer is equipped stainless steel connector.

  • Page 14: Dryer Cycle Process

    DRYER CYCLE PROCESS Default Conditions of operation and termination Drying Cooling Wrinkle care Cycle Temp- Display erature time Electro- Temp- Default Temp- Level Time sensor Control time Control** 68 ± 4°C 47 ± 5°C HEAVY DUTY HIGH (Normal) 54min Saturation (5min) COTTON/ 66 ±...

  • Page 15: Component Testing Information

    COMPONENT TESTING INFORMATION When checking the Component, be sure to turn the power off, and do voltage discharge sufficiently. CAUTION Component Test Procedure Check result Remark 1. Thermal cut off Measure resistance of terminal If thermal fuse is open must •...
  • Page 16 Component Test Procedure Check result Remark 7. Heater Measure resistance of the • Electric type following terminal Terminal: 1 (COM) - 2 Resistance value: 10Ω Terminal: 1 (COM) - 3 Resistance value: 10Ω Terminal: 2 - 3 Resistance value: 20Ω 8.
  • Page 17 Component Test Procedure Check result Remark 13. Outlet Thermostat Measure resistance of terminal • Gas type (Auto reset) to terminal • Gas funnel Resistance value ≒ ∞ Open at 203 ± 7°F (95 ± 5°C) Continuity < 1Ω Close at 158 ± 9°F (70 ± 5°C) •...

  • Page 18: Motor Diagram And Schematic

    MOTOR DIAGRAM AND SCHEMATIC When checking Component, be sure to turn Power off, then do voltage discharge sufficiently. NOTE Contact On / Off by Centrifugal Switch STOP MODE RUN MODE (When Motor does not operate) (Motor operates) Centrifugal switch Centrifugal switch (Pull Drive forward)

  • Page 19: Control Layout

    CONTROL LAY - OUT PWB ASSEMBLY DISPLAY LAYOUT ※ 7-SEG Display in QC-Test MODE 7-SEG MAIN P/NO DISPLAY P/NO NOTE DISPLAY Electric, Discovery Steam(D)LED, EBR36858801 18:88 North America EBR36858901 Gas, Discovery Steam(D) LED, EBR36858802 18:88 North America PWB ASSEMBLY LAYOUT Main PWB Asm (Discovery Steam(D) ※...

  • Page 20: Wiring Diagram

    WIRING DIAGRAM ELECTRIC DRYER WIRING DIAGRAM GAS DRYER WIRING DIAGRAM...

  • Page 21: Diagnostic Test

    DIAGNOSTIC TEST 1. This TEST should be used for Factory test /Service test. Do not use this DIAGNOSTIC TEST other than specified. 2. Activating the Heater manually with the Door open may trip the Thermostat attached to the Heater, therefore do not activate it manually.
  • Page 22 Test 1 120V AC Electrical supply When measuring power, be sure to wear insulated gloves, to and avoid an Caution electric shock. Trouble Symptom No power was applied to Controller. (LED,LCD Display off) Measurement Condition With Dryer Power On; Connector linked to Controller. •...
  • Page 23 Caution When measuring power, be sure to wear insulated gloves, to and avoid an electric shock. Trouble Symptom Check the Tab Relays Connection properly. Measurement Condition With Dryer Power On; Connector linked to Controller. 1.Power Connection < Table1 > : Connection of the Tab Relay with Heater (Elec) Tab Relay 1 Tab Relay 2 Heater 1 Heater 2...
  • Page 24 < Table 2 > : Connection of Tab Relay with PCB ASSEMBLY (Gas) Remark Color Harness Blue Wire Check the Matching color Between Harness wire and Tab Relay. Black Connector Housing (Black Housing – Black Tab Relay) Black Wire Connector Housing Tap relay 1 3.
  • Page 25 Test 2 Thermistor Test --- Measure with Power Off Before measuring resistance, be sure to turn Power off, and do voltage discharge. Caution (When discharging, contact the metal plug of Power cord with the Ground.) During Diagnostic Test, tE1 and tE2 Error occur. Trouble Symptom During operation, Heater would not turn off, or remains on.

  • Page 26: Test 3 Motor Test

    Test 3 Motor test Before measuring resistance, be sure to turn Power off, and do voltage discharge. Caution (When discharging, contact the metal plug of Power cord with earth line.) Trouble Symptom Drum will not rotate; No fan will function; No Heater will work. Measurement Condition Turn the Dryer’s Power Off, then measure resistance.

  • Page 27: Test 4 Moisture Sensor

    Test 4 Moisture sensor Before measuring resistance, be sure to turn Power off, and do voltage discharge. Caution (When discharging, contact the metal plug of Power cord with earth line.) Trouble Symptom Degree of dryness does not match with Dry Level. Measurement Condition Turn the Dryer’s Power Off, then measure resistance.

  • Page 28: Test 5 Door Switch Test

    Test 5 Door switch test Before measuring resistance, be sure to turn Power off, and do voltage discharge. Caution (When discharging, contact the metal plug of Power cord with earth line.) Door Opening is not sensed.(During operation, when opening Door, Drum motor and Trouble Symptom Heater run continuously) Door Close is not sensed.
  • Page 29 Test 6 Heater switch test - Electric Type Before measuring resistance, be sure to turn Power off, and do voltage discharge. Caution (When discharging, contact the metal plug of Power cord with earth line.) While operating, Heating will not work. Trouble Symptom Drying time takes longer.
  • Page 30 Test 7 GAS Valve test - Gas Type Caution When measuring power, be sure to wear insulated gloves, to avoid electric shock. While operating, Heating will not work. Trouble Symptom Drying time takes longer. Measurement Condition With dryer power on Power On &...

  • Page 31: Test 8 Semi-Conductor

    Test 8 Semi Conductor Before measuring resistance, be sure to turn Power off, and do voltage discharge. Caution (When discharging, contact the metal plug of Power cord with earth line.) Degree of Resistance is not in 300°æ30 Ω Trouble Symptom Measurement Condition Turn the Dryer’s Power Off, then measure resistance.

  • Page 32: Change Gas Setting (Natural Gas, Propane Gas)

    CHANGE GAS SETTING (NATURAL GAS, PROPANE GAS) Changing orifices and gas valve adjustments improperly can result in an Warning explosion and/or fire. Conversion must be made by a qualified technician. Initially , Natural Gas mode is set. Propane Gas Orifice is on sale as a Service Part to authorized servicers only.
  • Page 33 GAS VALVE FLOW START KEY PUSH VALVE 1 ON (VALVE 2 OFF) IGNITER ON IGNITER TEMPERATURE ABOUT FLAME DETECT OPEN VALVE 2 ON GAS IGNITION FLAME DETECT CLOSE DRYING VALVE 2 OFF GAS IGNITION GAS VALVE STRUCTURE Adjustment Screw START VALVE 1 IGNITER FLAME...

  • Page 34: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS Disassemble and repair the unit only after pulling out power plug from the outlet. WARNING ! TOP PLATE When you disassemble the top plate, be sure to take gloves and careful plate’s edge. Failure to do so can cause serious injury.
  • Page 35 PANEL DRAWER ASSEMBLY After pulling out the drawer, lift out the water tank. Remove 2 screws on the control panel.
  • Page 36 CONTROL PANEL ASSEMBLY WARNING ! When you disassemble the control panel, be sure to take gloves and careful panel frame’s edge. Failure to do so can cause serious injury. Remove 1 screw on the control panel frame. Disconnect the connectors. Pull the control panel assembly upward and then forward.
  • Page 37 COVER CABINET WARNING ! When you disassemble the door switch connector, be sure to take gloves and careful cabinet edge. Failure to do so can cause serious injury. Disassemble the top plate. Disassemble the control panel assembly. Disassemble the door assembly. Remove 2 screws.
  • Page 38 GUIDE ASM Remove 2 screws on the frame body. Push the Guide ASM to the back side and then lift it. Separate hoses from the pump and generator. Lift a pump and a generator up.
  • Page 39 FRAME BODY & PANEL FRAME Remove 4 screws on the frame body and then disassemble the frame body. Remove 4 screws on the panel frame and then disassemble the panel frame.
  • Page 40 TUB DRUM [FRONT] WARNING ! When you disassemble the lamp connector, be sure to take gloves and careful cabinet edge. Failure to do so can cause serious injury. Disassemble the top plate. Remove Cover Cabinet. Disconnect the door lamp and electrode sensor connector.
  • Page 41 DRYER EXHAUST CHANGE Remove a screw and the exhaust duct. 2-1. Detach and remove a knockout at the botton, left or right side as desired. (Right Side Vent not available on Gas dryer) ① ① , ② ② , ③ ③ the order of work. 2-2.
  • Page 42 FILTER ASSEMBLY Remove the filter. Remove 3 screws. Remove the Cover Grid. Disconnect the electrode sensor. BLOWER HOUSING Disassemble the top plate. Remove the Cabinet Cover and Tub Drum [Front]. Remove the Drum assembly. Remove 2 screws and cover (Air guide). Remove the bolt and washer.
  • Page 43 AIR DUCT Disassemble the top plate. Remove the Cover Cabinet. Remove the filter and 2 screws. Remove the air duct. ROLLERS Disassemble the top plate. Remove the Cover Cabinet and Tub Drum [Front]. Remove the Drum assembly and Tub Drum [Rear]. Disconnect the Air duct from the Tub Drum [Front].

  • Page 44: Exploded View

    EXPLODED VIEW 12-1. Control Panel & Plate Assembly A211 A210 A130 A120 A140 A110...
  • Page 45 12-2. Panel Drawer Assembly & Guide Assembly K503 K508 K502 K506 K501 K505 K504 A090 K507 A172 A161 A160 A171 A170...

  • Page 46: Cabinet & Door Assembly

    12-3. Cabinet & Door Assembly A590 A700 A800 A570 A560 A390 A600 A131 A330 A300 A500 A320 A305 A530 A510 A520 A310 A525 A430 A540 A400 A450 A410 A460 A420...
  • Page 47 12-4-1. Drum & Motor Assembly: Electric Type F200 K410 K400 K120 K140 K100 K130 K251 K250 K310 K330 K320 K340 K222 K221 K620 K230 K210 K250 K350 K360 K610 K550 K560 K251 K240 K530 K640 K651 F140 K510 K520 K540 F130 K650 F110...

This manual is also suitable for:

Dlex8377wmDlex7177rmDlex8377nm

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