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LG LSRG307ST Service Manual
LG LSRG307ST Service Manual

LG LSRG307ST Service Manual

30” freestanding gas range
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30" Freestanding Gas Range
SERVICE MANUAL
MODEL: LRG3085ST
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL63290116
LSRG307ST
1
Website http://biz.lgservice.com
Internal Use Only
May, 2014
Printed in Korea

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Summary of Contents for LG LSRG307ST

  • Page 1 삼 흥 정 판 Internal Use Only Website http://biz.lgservice.com 30” Freestanding Gas Range SERVICE MANUAL MODEL: LRG3085ST LSRG307ST CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. May, 2014 P/NO : MFL63290116 Printed in Korea...
  • Page 2 SAFETY PRECAUTIONS • Repairs of the appliance should be carried out by a licensed technician only. Incorrect repairs may result in dangerous situations. If you need repairs, contact an LG Service Center or your dealer. • If the power cord is defective, it must be replaced by a qualified service agent with a UL listed range cord.
  • Page 3: Table Of Contents

    TABLE OF CONTENTS GENERAL- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 ~ 1-5 •...
  • Page 4 (Page) COMPONENT TEST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-1 ~ 4-4 •...
  • Page 5: General

    GENERAL IMPOR ANT SAFETY INSTRUCTIONS IMPOR ANT SAFETY INSTRUCTIONS Read and follow all instructions before using your oven to prevent the risk of fire, electric shock, injury to person, or damage when using the range. This guide don’t cover all possible conditions that may occur. For further assistance contact your service agent or manufacturer.
  • Page 6 GENERAL IMPOR ANT SAFETY INSTRUCTIONS IMPOR ANT SAFETY INSTRUCTIONS • Be sure your appliance is properly installed and grounded by WARNING a qualified technician. • Do not repair or replace any part of the appliance unless • DO NOT store items of interest to specifically recommended in the manual.
  • Page 7 GENERAL IMPOR ANT SAFETY INSTRUCTIONS IMPOR ANT SAFETY INSTRUCTIONS SURFACE COOKING UNITS SELF-CLEAN OVENS • If the top burner flame goes out,gas is still flowing to the • Do Not Clean Door Gasket – The door gasket is essential burner until the knob is turned to the “OFF” position.Do not for a good seal.
  • Page 8: Model & Serial Number Label And Tech Sheet Locations

    GENERAL MODEL & SERIAL NUMBER LABEL MODEL & SERIAL NUMBER LABEL AND TECH SHEET LOCA TIONS AND TECH SHEET LOCA TIONS The Model/Serial Number label and Tech Sheet locations are shown below. Model & Serial Number Location Tech Sheet Location (On Low Rear Cover)
  • Page 9: Specifications

    GENERAL SPECIFICA TIONS SPECIFICA TIONS Model Number LRG3085ST / LSRG307ST Category Single Convection Overall Width Installation type Freestanding Color availability Control Oven Glass Touch Cooktop Knob Display Scroll VFD Electronic clock & timer Control lock capability Audible preheat signal Special function Setting (6 categories) 1.
  • Page 10: Using Your Range

    USING YOUR RANGE GENERAL INFORMA TION GENERAL INFORMA TION Rating Label Convection Bake / Roast Mode During a convection bake the fan and the burner Model numbers are recorded on the rating label. run opposite of each other, however on a Rating label is located on the lower front left corner convection roast the fan and burner operate at the of the oven frame.
  • Page 11: Control Panel Features

    USING YOUR RANGE CONTROL P ANEL FEA TURES CONTROL P ANEL FEA TURES Model: LRG3085ST / LSRG307ST Conv. Conv. Bake Roast START Bake Broil Oven Lock Warm Proof CLEAR Oven Easy Self Start Cook Timer Light Clean Clean Clock Time...
  • Page 12: To Turn On On The Surface Burners

    USING YOUR RANGE 1. TO TURN ON THE SURFACE BURNER 4. TO TURN ON/OFF THE OVEN LIGHT 1. Be sure all the surface burners are placed in The oven light automatically turns ON when the their respective positions. door is opened. The oven light may also be 2.
  • Page 13: Bake, Timed Bake, Delayed Timed Bake

    USING YOUR RANGE 3) LANGUAGE SELECTION (English or 10. CONVECTION ROAST Spanish) CONV. Desired START 1. Touch and hold the pad for 3 seconds. ROAST Temp. Then touch the WARM pad twice. 11. EASY CLEAN 2. Touch “1” pad for ENGLISH or “2”...
  • Page 14: Component Access

    COMPONENT ACCESS This section instructs you on how to service each component inside the range. The components and their locations are shown below. COMPONENT LOCA TIONS COMPONENT LOCA TIONS Power PCB Relay PCB Main PCB Igniter (broil) Oven light Spark module Burner pipe Lock Motor and Micro Switch...
  • Page 15 COMPONENT ACCESS REMOVING THE BACK, CONTROL COVER AND KEY P REMOVING THE BACK, CONTROL COVER AND KEY P ASSEMBL ASSEMBL 8. Remove the 2 screws of the eyebrow from the WARNING controller sub assembly and remove the eyebrow. • DISCONNECT power supply cord from the outlet before servicing.
  • Page 16: Removiing Power Control Board

    COMPONENT ACCESS REMOVING POWER CONTROL BOARD (PCB) REMOVING POWER CONTROL BOARD (PCB) 4. There are 3 PCB's (power control board). When WARNING you check PCB, check the proper pcb in default mode and check main pcb. • DISCONNECT power supply cord NOTE: Refer to the page 6-1~6-2 for from the outlet before servicing.
  • Page 17 COMPONENT ACCESS REMOVING THE COOKT OP PLA TE AND REMOVING THE COOKT OP PLA TE AND THE SP ARK MODULE (IG TRANS) THE SP ARK MODULE (IG TRANS) 5. Life top up at front. WARNING • DISCONNECT power supply cord from the outlet before servicing.
  • Page 18 OP BURNER ASSEMBL 4. Remove the tubing fitting (5/8-inch). WARNING 5. Remove 2 phillips head screws • DISCONNECT power supply cord (LRG3085ST / LSRG307ST) from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices.
  • Page 19: Removing The Cooktop Parts

    COMPONENT ACCESS REMOVING THE COOKT OP P REMOVING THE COOKT OP P 3. To remove the valve: WARNING a) Remove the manifold panel (See the step 3 on page 3-5). • DISCONNECT power supply cord b) Remove the fitting that you need to remove. from the outlet before servicing.
  • Page 20 COMPONENT ACCESS 4. To remove the ignition switch: a) Remove the manifold panel (See the step 3 on page 3-5). b) Pry on the 2 release tabs and slide the switch off the valve stem. c) Remove the 2 connectors and remove the ignition switch.
  • Page 21 COMPONENT ACCESS REMOVING THE DOOR LA TCH & DOOR SWITCH REMOVING THE DOOR LA TCH & DOOR SWITCH b) Remove the door latch. WARNING 5. To remove the door switch: • DISCONNECT power supply cord a) Remove the door switch from the range. To do this, squeeze tabs and use a ratchet from the outlet before servicing.
  • Page 22: Removing The Broil Burner Assembly

    COMPONENT ACCESS REMOVING THE BROIL BURNER ASSEMBL REMOVING THE BROIL BURNER ASSEMBL d) Remove the igniter connecter in the cavity WARNING (To get the connecter, pull the wire toward the cavity). • DISCONNECT power supply cord e) Remove the broil burner assembly. from the outlet before servicing.
  • Page 23: Oven Bottom, The Frame Guide And The Burner Assembly

    COMPONENT ACCESS OVEN BOTT OM, THE FRAME GUIDE AND THE BURNER OVEN BOTT OM, THE FRAME GUIDE AND THE BURNER ASSEMBL ASSEMBL 1. Turn off the electrical supply and gas supply 6. To remove the nozzle case: going to the range. - Remove the screw and then remove nozzle 2.
  • Page 24: Removing The Convection An Blade And Fan Motor

    COMPONENT ACCESS REMOVING THE CONVECTION AN BLADE AND F AN MOT REMOVING THE CONVECTION AN BLADE AND F AN MOT 1. Turn off the electrical supply and gas supply CAUTION going to the range and remove the oven racks. 2. Remove the four Fan cover screws and set the •...
  • Page 25: Removing The Oven Light & Socket Assembly

    COMPONENT ACCESS REMOVING THE OVEN LIGHT & SOCKET ASSEMBL REMOVING THE OVEN LIGHT & SOCKET ASSEMBL CAUTION WARNING • DISCONNECT power supply cord • Be careful not to scratch or chip the from the outlet before servicing. oven liner paint when you remove •...
  • Page 26: Removing The Latch Drive Assembly

    COMPONENT ACCESS REMOVING THE LA TCH DRIVE ASSEMBL REMOVING THE LA TCH DRIVE ASSEMBL DOOR LOCKING MECHANISM WARNING The door lock assembly is located at the back side • DISCONNECT power supply cord of range. from the outlet before servicing. The structural elements are as below.
  • Page 27: Removing The Oven Temperature Sensor

    COMPONENT ACCESS REMOVING THE OVEN TEMPERA TURE SENSORS REMOVING THE OVEN TEMPERA TURE SENSORS WARNING • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating. • RECONNECT all grounding devices. - Failure to do so can result in severe personal injury, death or electrical shock.
  • Page 28 COMPONENT ACCESS REMOVIING & REPLACING THE DRA REMOVIING & REPLACING THE DRA CAUTION • Disconnect the electrical power to the range at the main fuse or circuit breaker panel. Failure to do so can result in severe personal injury, Pull the drawer death, or electrical shock.
  • Page 29: Removing & Replacing The Lift-Off Oven Door

    COMPONENT ACCESS REMOVING & REPLACING THE LIFT -OFF OVEN DOOR REMOVING & REPLACING THE LIFT -OFF OVEN DOOR To replace the door: CAUTION 1. Firmly grasp • Be careful when removing and both sides of the lifting the door. door at the top. •...
  • Page 30: Removing The Oven Door Handle & Glass

    COMPONENT ACCESS REMOVING THE OVEN DOOR HANDLE & GLASS REMOVING THE OVEN DOOR HANDLE & GLASS 6. To remove the door handle & trim WARNING a) Remove the 2 door handle screws and lift the door handle off door trim and slide up the door trim. •...
  • Page 31 COMPONENT ACCESS 7. To remove a hinge hanger assembly: d) Lift the inner oven door glass and bracket a) Remove the 2 top liner screws assembly out of the door liner. (See step 3 on page 3-16) b) Place the door liner assembly on a padded work surface with the hinge hangers over the edge.
  • Page 32: Removing The Oven Door Gasket

    COMPONENT ACCESS REMOVING THE OVEN DOOR GASKET REMOVING THE OVEN DOOR GASKET c) Pull the ends of the gasket out of the liner WARNING holes. • DISCONNECT power supply cord Liner Hole from the outlet before servicing. • Replace all panels and parts before operating.
  • Page 33: Removing A Side Panel

    COMPONENT ACCESS REMOVING A SIDE P ANEL REMOVING A SIDE P ANEL 7. Remove the 2 screws from the left or right side WARNING panel. • DISCONNECT power supply cord from the outlet before servicing. • Replace all panels and parts before operating.
  • Page 34 COMPONENT ACCESS REMOVE THE OVEN V VE (SAFETY V REMOVE THE OVEN V VE (SAFETY V & GAS REGULA & GAS REGULA 5. To remove the gas regulator: WARNING a) Remove the 2 fittings and a gas supplier fitting. • DISCONNECT power supply cord from the outlet before servicing.
  • Page 35: Component Test

    COMPONENT TEST Before testing any of components, perform the following checks: NOTE: 1. The most common cause for control failure is corrosion on connectors. Therefore, disconnecting and reconnecting wires will be necessary throughout test procedures 2. ALL units in the first few days of use should be checked for mis-wiring or loose connections 1.
  • Page 36: Door Locking Motor

    Components Test procedures Results Normal: Approximately Door locking Motor 1. Refer to page 3-13 for the servicing procedure 2.6 kΩ ± 10% 2. Measure the resistance If not replace (Multiple meter scale: R x 1000) Abnormal: Infinite(open) below 5Ω (shorted) Door latch Door latch Micro Switch...
  • Page 37: Door Switch

    Components Test procedures Results Door switch 1. Refer to page 3-8 for the servicing procedure Door open Door closed 2. Measure the resistance after cooling down (Multiple meter scale: R x 1) Continuity Infinite Normal: Approximately 1. Measure the resistance after cooling down Oven lamp 5 Ω...
  • Page 38: Oven (Safety) Valve

    Components Test procedures Results Normal: Approximately 1. Refer to page 3-21 for servicing procedure. Oven (safety) valve 1 ~ 3 Ω 2. Measure the resistance after cooling down. If not replace (Multiple meter scale : R x 1) Upside Downside approximately other 1.
  • Page 39: Conversion To Lp Gas

    CONVERSION TO LP GAS 2. CONVERT THE PRESSURE REGULATOR WARNING WARNING • Turn off the electrical supply and gas supply going to the range. • Do not remove the pressure • Replace all panels and parts before regulator from the range. operating.
  • Page 40 BURNER OUTPUT RATINGS; BTU/HR injury, death or electrical shock. LP (Propance) Gas, 10” W.C.P MODEL BTU RATE ORIFICE CODE LRG3085ST,LSRG307ST LRG3085ST, LSRG307ST CAUTION BURNER 9,500 • Be careful when you work on the 9,100 gas range handling the sheet metal...
  • Page 41 • Turn off the electrical supply and 5) For the right front burner of gas supply going to the range. LRG3085ST,LSRG307ST, the choke and • Replace all panels and parts before self threading screw will be needed as operating.
  • Page 42 CONVERSION TO LP GAS 3) Remove the orifice spud from nozzle holder WARNING using a 13/32” or 10mm wrench. 4) Install the LP orifce spud(F) to the nozzle • Turn off the electrical supply and holder. To prevent leakage, make sure the gas supply going to the range.
  • Page 43 CONVERSION TO LP GAS 4) Insert a small, flat bladed screwdriver into the WARNING valve shaft as shown in Fig. 1. Turn the adjustment screw until the flame • Turn off the electrical supply and reaches the desired size. gas supply going to the range. 5) Replace the knob.
  • Page 44: Composition Of Control

    COMPOSITION OF CONTROL Front Back Main PCB (P/N : EBR73811706) Controller assembly Power PCB (P/N : EBR57124701) Relay PCB (P/N : EBR52349704) Control Supporter Key PCB (P/N : EBR52350007) Front Back PCB case assembly...
  • Page 45: Oven Main Pcb

    COMPOSITION OF CONTROL Oven Main PCB Oven Main PCB P/N : EBR73811706 Power PCB Power PCB P/N : EBR57124701 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 CN10 Relay PCB Relay PCB...
  • Page 46: Diagnosis Through Schematic

    DIAGNOSIS THROUGH SCHEMATIC Symptom : Oven hot(F-6) Symptom : Symptom : -. Check: All heater relays are Oven lamp not operating no heating(F-9) open/short -. Check the Lamp coil’s -. Check : relative part resistance Symptom : Door lock fail (F-10) -.
  • Page 47: Check The Failure Code (F-Code)

    CHECK THE FAILURE CODE (F-code) ■ When the oven has some failure on cooking - Cancel the cook. - In case of failure , F-code will not display during normal operation. - It memorizes F-code logs in EEPROM. ■ Check the failure code as follow these steps. 1.
  • Page 48: Failure Code Summary

    FAILURE CODE SUMMARY Code Description How to detect Check point Opened Sensor Oven sensor remains open for over 1 min 1. Wiring during cooking. 2. Oven Sensor Shorted Sensor Oven sensor is short for over 1 min 1. Wiring during cooking. 2.
  • Page 49: Checking Flow Chart By Failure

    CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Power Failure 1. Check Electric Wiring (Dead) 2. Check the Power PCB and Main PCB Voltage 2. No Display 10-1...
  • Page 50: Power Failed(Dead), No Display

    CHECKING FLOW CHART BY FAILURE Power Off Power Failed(Dead), No display? Replace the defective Is the electric wiring normal? harness Measure the resistance Power On State Power cord and CN01’s connection Go to No 4 Check the key beep. Touch Normal : continuity the “clear key”, Is the beep Abnormal : infinite...
  • Page 51 CHECKING FLOW CHART BY FAILURE Power On Power On Replace the Replace the Check the voltage of Is the voltage of Main Power PCB Main PCB Power PCB PCB’s Vcc 4.5V ~ 5.5V? Is the voltage as below? Check the voltage between pin2 and pin3 of IC2 PIN No.
  • Page 52 CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. No heating 1. Check Gas supply 2. F-9 2. Check Electric Wiring 3. Check Heater’s Resistance. 4. Check the Sensor. 10-4...
  • Page 53: Oven Does Not Heat, F-9

    CHECKING FLOW CHART BY FAILURE Power Off Oven does not heat, F-9 Replace the Is the glowbar ignitor failed glowbar normal? Power Off Measure the resistance of each glowbar Reconnect or (The resistance is shown on next page) repair the Is the disconnect or loose connector connector?
  • Page 54 CHECKING FLOW CHART BY FAILURE Power Off Range Of the resistance Heater Min[Ω] Max [Ω] Replace the Broil Glowbar 45.0 400.0 Is the resistance of failed thermistor thermistor normal? Bake Glowbar 45.0 400.0 Gas Valve(Broil) Check: Gas Valve(Bake) Pins 1and 2 of CN5 wiring in main PCB Normal - approximately 1.09kΩ...
  • Page 55 CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Door Lock System 1. Check the Electric wiring Failure 2. Check the Motor’s Resistance 2. F-10 3. Check the Relay PCB(Lock Motor Relay) 10-7...
  • Page 56: Door Lock System Failure

    CHECKING FLOW CHART BY FAILURE Power Off Door Lock System Failure,F-10? Replace the Is the door lock switch micro switch (micro switch) normal? Note : measure the resistance of Just after self-clean start, the door lock motor starts to door lock switch normally open type rotate.
  • Page 57: Sensing Fail

    CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Sensing Fail 1. Check the Electric Wiring 2. F-1 2. Check the Test Mode 3. F-2 3. Check the Sensor’s Resistance 10-9...
  • Page 58 CHECKING FLOW CHART BY FAILURE Sensing Fail, F-1, F-2? Power Off Reconnect or repair the Is the disconnect or loose connector connector? 1. Sensor connection 2. CN05 of Main PCB Power On Go to No 1 Is the value of thermistor normal? Check: using the test mode Sensor...
  • Page 59: Oven Too Hot, F-6, F-16

    CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Oven hot 1. Check the Resistance of the Relay. 2. F-6 10-11...
  • Page 60 CHECKING FLOW CHART BY FAILURE Oven too hot, F-6, F-16? 2pin(CN10) Power Off Bakel(RY6) Relay Replace the Resistance L:TAB1 L:TAB1 L:TAB1 Is the resistance of L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 failed thermistor thermistor normal? Check:...
  • Page 61 CHECKING FLOW CHART BY FAILURE Power On Is the Relay operation signal Replace Nomal? the Main PCB In Idle Mode (press the clear), (EBR73811706) Check the voltage of Diode 1. Both D40 ends. 2. Both D41 ends 2. Both D41 ends Normal: - approximately 0 V Abnormal:...
  • Page 62 CHECKING FLOW CHART BY FAILURE Symptom Check Point 1. Keypad Failure 1. Check the Door Locking System. 2. F-3 Error 2. Check the Electric Wiring. 10-14...
  • Page 63: Error (Touch-Sensor Key Error) Or Key Does Not Input

    CHECKING FLOW CHART BY FAILURE Power On F-3 error (Touch-sensor key error) Or Key does not input Is the Key PCB Replace normal operation? The Key PCB Power Off (EBR52349704) Check: Reconnect Re-connect CN1 of or repair the Key PCB and CN3 of Is the disconnect or connector loose connector?
  • Page 64: Key Operation Test

    CHECKING FLOW CHART BY FAILURE Key operation Test Conv. Conv. Bake Roast START Bake Broil Oven Lock Warm Proof CLEAR Oven Easy Self Start Cook Timer Light Clean Clean Clock Time Time On/Off [Fig.1] How to check Key operation 1. Keys should be accessed according to priority and check the buzzer operation when key is accessed 2.
  • Page 65: Trouble Shooting

    TROUBLE SHOOTING BEFORE CALLING FOR SERVICE BEFORE CALLING FOR SERVICE Before you call for service, review this list.It may save you time and expense. The list includes common occurrences that are not the result of defective workmanship or materials in this appliance. PROBLEMS POSSIBLE CAUSES SOLUTIONS...
  • Page 66 TROUBLE SHOOTING PROBLEMS POSSIBLE CAUSES SOLUTIONS Food does not bake or roast • Improper oven controls setting. • See the “USING THE OVEN” section in properly user’s guide. • Incorrect rack position. • See the “USING THE OVEN” section in user’s guide.
  • Page 67 TROUBLE SHOOTING PROBLEMS POSSIBLE CAUSES SOLUTIONS Oven will not selfclean • The oven temperature is too high • Allow the range to cool to room to set a self-clean operation. temperature and reset the controls. • Improper oven controls setting. •...
  • Page 68 TROUBLE SHOOTING PROBLEMS POSSIBLE CAUSES SOLUTIONS Oven racks are difficult to • The oven racks were cleaned in a • Apply a small amount of vegetable oil to a slide self-clean cycle. paper towel and wipe the edges of the oven racks with the paper towel.
  • Page 69: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION MODEL: Customer Model Product Code SVC Model CONTROLLER PARTS COOKTOP PARTS DOOR PARTS 9504 9506 CAVITY PARTS DRAWER PARTS -12-1-...
  • Page 70 #EV# DOOR PARTS 102U W243 1000 1733 1020 102S 1703 1018 W222 1704 1703 1018 1015 1024 102S 1009 W101 1733 1023 102U 1704 1021 -12-2-...
  • Page 71 #EV# CONTROLLER PARTS 2048 2075 2381 2030 2402 3006 2006 2009 3006 2501 2037 2128 2028 2036 2033 -12-3-...
  • Page 72 #EV# COOKTOP PARTS 3945 3946 3945 3947 7384 3976 3977 3971 3973 3979 W294 3978 3974 3972 W294 3056 W295 3401 3986 3990 3402 3991 3925 3940 3992 3960 3993 3994 3961 3962 3995 W294 3985 3963 3950 3964 3951 3985 3953 3952...
  • Page 73 #EV# DRAWER PARTS 8388 8513 8514 8501 W228 8513 8507 8523 8523 8522 8540 8541 8602 5505 8504 8025 8512 8520 5505 W229 9381 8511 8519 8502 8502 8508 8708 -12-5-...
  • Page 74 #EV# CAVITY PARTS 3013 5501 5063 5149 5941 3924 5510 5536 W115 5900 3006 5700 5010 5944 W318 9384 5517 5942 5902 5921 3006 W231 5912 5502 5903 5021 W234 5504 5404 W231 5503 3006 5511 8550 W231 5463 5505 W230 5407 W401...

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