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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

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Содержание DLE7177WM

Страница 1: ...www LGEservice com DISCOVERY DRYER TRAINING MANUAL CAUTION READ THIS MANUAL CAREFULLY BEFORE DIAGNOSING OR SERVICING THIS PRODUCT ...

Страница 2: ...0 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 ...

Страница 3: ...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 faile...

Страница 4: ...gram 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...

Страница 5: ...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 DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 5 of 60 TRAINING MANUAL ...

Страница 6: ...ilable 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 lice...

Страница 7: ...ing 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 d...

Страница 8: ...as 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 DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 8 of 60 TRAINING MANUAL ...

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

Страница 10: ... 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...

Страница 11: ... 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 ...

Страница 12: ...ront 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 DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 12 of 60 TRAINING MANUAL ...

Страница 13: ... four adjusters on the dryer Note which holes are for the washer and which are for the 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 ...

Страница 14: ...ourth 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 c...

Страница 15: ...em 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 DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 15 of 60 TRAINING MA...

Страница 16: ...ocal 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 DL...

Страница 17: ...ain 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 DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 17 of 60 TRAINING MANUAL ...

Страница 18: ...lief 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 DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 18 of 60 TRAINING MANUAL ...

Страница 19: ... properly trained and licensed persons Always inspect joints and connections for a leak with a soapy solution If you see bubbles turn the gas off and open a window If you smell gas turn off the main valve and open a window The gas dryer requires a 110 Volt single outlet dedicated circuit The cord is installed at the factory and no user intervention is required DLE8377xM DLG8388xM DLE7177WM DLE7188...

Страница 20: ...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 ...

Страница 21: ...OMPONENT 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 ...

Страница 22: ...DRYER COMPONENT TESTING PROCEDURES continued DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 22 of 60 TRAINING MANUAL ...

Страница 23: ...DRYER COMPONENT TESTING PROCEDURES continued DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 23 of 60 TRAINING MANUAL ...

Страница 24: ...urn 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 TRAINING MANUAL ...

Страница 25: ...t slides forward and turns the power off RUN POSITION STOP POSITION There is an additional safety in the form of a belt switch that shuts off power to the electric motor if the belt breaks Belt tension holds the switch closed If the belt breaks the switch opens and power to the motor is cut When the motor stops the centrifugal switch functions as a safety device to turn off the fuel gas or electri...

Страница 26: ... 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 Other models vary slightly The gas and electric models have a different display board DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 26 of 60 TRAINING MANUAL ...

Страница 27: ...he 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 ...

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

Страница 29: ...will trip the thermostat attached to the heater 1 Dryer must be in standby mode Plugged in turned off 2 Press and hold MORE TIME and LESS TIME then press power 3 Press START PAUSE to advance to the next test 4 Unplug the dryer for one minute after using the diagnostic mode DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 29 of 60 TRAINING MANUAL ...

Страница 30: ...cautionary 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 SYMPTOM No power display off CONDITION Power on to dryer controller connected continued on next page DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 30 of 60 TRAINING MANUAL ...

Страница 31: ...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 ...

Страница 32: ...on 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 ...

Страница 33: ...trical 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 Thermistor resistance temperature DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 33 of 60 TRAINING MANUAL ...

Страница 34: ...re 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 TRAINING MANUAL ...

Страница 35: ... 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 Table IMC Ratio and Display Value IMC Initial Moisture Content DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 35 of 60 TRAINING MANUAL ...

Страница 36: ...NING 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 ...

Страница 37: ...ectric 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 ...

Страница 38: ...ST 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 ...

Страница 39: ... Sensor Test 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 ...

Страница 40: ...ed for natural gas 1 Close the adjustment screw Notice there is a nut on the adjustment screw This nut is secured to the thread with a sealing compound The nut is pre positioned to the place the valve would be properly adjusted for LP It s purpose is to provide a shoulder for positioning the adjustment screw if the dryer is converted from natural gas to propane NOTE The conversion should be perfor...

Страница 41: ...should be performed ONLY by trained licensed and certified service personnel 3 The conversion kit includes a propane orifice complete instructions for making the conversion and a label indicating the conversion kit has been installed All conversion work including testing and adjusting must be completed by a trained licensed and certified gasfitter DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 41 of...

Страница 42: ...eaches 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 If ignition occurs as planned the drying cycle will operate GAS IGNITION SEQUENCE GAS VALVE CONSTRUCTION IGNITION FLOW CHART DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 42 of 60 TRAINING MANUAL ...

Страница 43: ...IR INSTRUCTIONS TOP PLATE 1 Remove three screws along the back of the top cover plate 2 Slide the top plate backward 3 Lift the top plate off and set it aside DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 43 of 60 TRAINING MANUAL ...

Страница 44: ...t misassembly 3 Pull the control panel upward then forward Be sure to disengage all the plastic tabs along the top 4 Lay the control panel on its face on a soft protective cloth 5 Remove nine screws on the display PWB 6 Remove four screws on the main PWB 7 Disassemble the control panel DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 44 of 60 TRAINING MANUAL ...

Страница 45: ...lt the front away from the dryer and disconnect the door switch wire harness DOOR REVERSAL 1 Remove two screws that hold the door Remove the door and set it aside on a soft protective cloth Save the hinge shim 2 Remove two screws near the latch 3 Remove two screws and the latch piece 4 Rotate everything 180 and reinstall so the door opens from the other side DLE8377xM DLG8388xM DLE7177WM DLE7188WM...

Страница 46: ...still be around the drum 4 To replace the drum put the belt around it and set into the dryer to rest on the two rubber wheels on the tub back Let the belt hang 6 Replace the tub front holding the drum up so it can set on the two rubber wheels on the tub front 7 Make sure the belt is around the circumference of the drum near the point where it usually rides 8 Reach in through the front or the side ...

Страница 47: ...and remove the screw 3 Slide the shield toward the screw and remove it 4 Unscrew the bulb and replace it with a 15 watt 120 V candelabra base bulb 5 Replace the shield and screw Notice the bulb holder has feet that hold it in place and tabs to keep it positioned properly The socket can be removed and replaced by squeezing the tabs and pulling the bulb and socket into the housing Press it back into...

Страница 48: ...yers due to internal piping interference B Insert the replacement pipe C Attach the pipe with a screw 3 Pre assemble the elbow and a replacement duct and secure the joint with duct tape 4 Insert the pre assembled elbow into the dryer through the vent hole and connect it to the internal pipe 5 Tear off some pieces of duct tape and secure that joint as well 6 Connect the pipe to the exhaust duct DLE...

Страница 49: ...olding the cover grid 3 Remove the cover grid 4 Disconnect the electrode sensors BACK COVER 1 Remove the top plate 2 Remove the front cover 3 Remove the tub front 4 Remove the drum 5 Remove 7 screws 6 Remove the back cover DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 49 of 60 TRAINING MANUAL ...

Страница 50: ... DUCT 1 Remove the top plate 2 Remove the front cover 3 Remove the filter 4 Remove 2 screws at the top of the air duct 5 Remove the air duct DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 50 of 60 TRAINING MANUAL ...

Страница 51: ...ft 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 shaft from the machine Be sure to install the small bushings These must be between the roller and the retainer on both sides of the roller See photo DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 51 of 60 TRAINING MANUAL ...

Страница 52: ...he drum 5 Remove the two screws and the cover on the air guide 6 Remove the nut and washer on the blower shaft 7 Remove the fan from the shaft 8 Press down the hooked end of the clamps and remove them 9 Disconnect and remove the motor DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 52 of 60 TRAINING MANUAL ...

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

Страница 54: ...DRYER EXPLODED VIEW Cabinet and Door Assembly DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 54 of 60 TRAINING MANUAL ...

Страница 55: ...DRYER EXPLODED VIEW Drum and Motor Electric Model DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 55 of 60 TRAINING MANUAL ...

Страница 56: ...DRYER EXPLODED VIEW Drum and Motor Gas Model DLE8377xM DLG8388xM DLE7177WM DLE7188WM Page 56 of 60 TRAINING MANUAL ...

Страница 57: ...r Hook 4026EL3007A 4026EL3007A 4026EL3007A 4026EL3007A A420 Outer Door Frame 3212EL1015A 3212EL1015A 3212EL1015A 3212EL1015A A430 Hinge 4774EL2001A 4774EL2001A 4774EL2001A 4774EL2001A A450 Inner Door Frame 3212EL1005B 3212EL1005B 3212EL1005B 3212EL1005B A460 Gasket 4986EL2004A 4986EL2004A 4986EL2004A 4986EL2004A A500 Cabinet Assembly 3091EL0003P 3091EL0003M 3091EL0003Q 3091EL0003N A510 Cap Knockou...

Страница 58: ...01E 3661EL1001E 3661EL1001E K530 Duct Assembly 5209EL1006A 5209EL1006A 5209EL1006A 5209EL1006A K540 Guide Assembly 4975EL3001A 4975EL3001A 4975EL3001A 4975EL3001A K550 Thermistor NTC 6323EL2001B 6323EL2001B 6323EL2001B 6323EL2001B K560 Thermostat 6931EL3002A 6931EL3002A 6931EL3002A 6931EL3002A K600 Bracket Motor 4810EL1002A 4810EL1002A 4810EL1002A 4810EL1002A K610 Motor Unclassified 4681EL1002A 46...

Страница 59: ... this page intentionally blank ...

Страница 60: ... 2006 LG Electronics Inc Printed in the USA ...

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