LG LMVM2277ST Training Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Microwave Oven
  5. LMVM2277ST
  6. Training manual
LG LMVM2277ST Training Manual

LG LMVM2277ST Training Manual

Over-the-range microwave
Hide thumbs Also See for LMVM2277ST:
Table of Contents

Advertisement

Quick Links

Download this manual
LG TRAINING MANUAL
LG TRAINING MANUAL
Over-the-Range Microwave LMVM2277ST
Spring 2008

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the LMVM2277ST and is the answer not in the manual?

Questions and answers

Related Manuals for LG LMVM2277ST

Summary of Contents for LG LMVM2277ST

  • Page 1 LG TRAINING MANUAL LG TRAINING MANUAL Over-the-Range Microwave LMVM2277ST Spring 2008...
  • Page 2 Published January 2008 by LG Electronics USA Trainng Center Customer Service (and Part Sales): (800) 243-0000 Technical Support (and Part Sales): (800) 847-7597 Training Center: (256) 774-4051 USA Website: www.lgusa.com (us.lge.com) Customer Service Website: us.lgservice.com B2B Service Website: aic.lgservice.com Training Website: www.LGCSAcademy.com...

  • Page 3: Table Of Contents

    LMVM2277ST MICROWAVE OVEN LMVM2277ST (Over-The-Range Microwave Oven) CONTENTS Safety Notice, Other Notices, and Disclaimer Introduction Specifications Warranty Page General Warnings and Safety Information Oven Installation Turntable Installation Operating Instructions Power Levels Care and Cleaning Oven Exterior Oven Interior Grease Filters...

  • Page 4: Microwave Oven

    LMVM2277ST MICROWAVE OVEN Component Test Procedures (continued) High Voltage Diode Turntable Motor Ventilation Van /Motor Humidity Sensor Stirrer Fan Motor Microwave Leakage Test Procedure Microwave Power Test Procedure (Traditional Method) Microwave Power Test Procedure (Alternate Method) Checkout Procedures Blown Fuse...

  • Page 5: Safety Notice, Other Notices, And Disclaimer

    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 6: Introduction

    LMVM2277ST MICROWAVE OVEN INTRODUCTION The LMVM2277ST is part of the new LG complete kitchen suite. It can be purchased separately but is designed to be sold with the matching refrigerator, range, and dishwasher. This diagram illustrates the major parts of the oven as seen by the customer.

  • Page 7: Specifications

    LMVM2277ST MICROWAVE OVEN SPECIFICATIONS Rated Power Consumption 1,700 W max (MWO + lights + fan) Microwave Output 1,100 W (IEC 60705) Frequency 2,450 MHz ± 50 MHz Power Supply 120 V , 60Ø Rated Current 14.5 Amps (MWO + lights + fan)

  • Page 8: Warranty

    LMVM2277ST MICROWAVE OVEN WARRANTY LMVM2277ST Page 6 TRAINING MANUAL...

  • Page 9: General Warnings And Safety Information

    LMVM2277ST MICROWAVE OVEN GENERAL WARNINGS and SAFETY INFORMATION • Always unplug the oven to disassemble or repair it. • Never operate the microwave oven when it is empty. When cooking very small amounts of food, put a glass of water in the cooking compartment.

  • Page 10: Oven Installation

    LMVM2277ST MICROWAVE OVEN OVEN INSTALLATION The LMVM2277ST must be properly installed before operation. Installation includes mounting the bracket on the wall with toggle bolts and/or lag bolts and drilling holes in the cabinet above the oven to accommodate the electric cord and the upper mounting bolts.

  • Page 11: Turntable Installation

    LMVM2277ST MICROWAVE OVEN TURNTABLE INSTALLATION The turntable is a multi-part arrangement that includes a round glass tray that rotates and a rectangular glass tray that moves laterally at the same time. Smaller dishes sit on the round tray while they rotate and move laterally;...

  • Page 12: Operating Instructions

    LMVM2277ST MICROWAVE OVEN OPERATING INSTRUCTIONS All functions are available from the control panel. Operation is similar to most other microwave ovens. For example, to set two-stage cooking with a cook time of 3 minutes at full power and 7 minutes, thirty seconds at...
  • Page 13 LMVM2277ST MICROWAVE OVEN When the oven is first plugged in, or after a power failure, the display will flash the message PLEASE SET THE TIME OF DAY. If the time is not set, the colon (:) will display until you touch CLOCK.

  • Page 14: Power Levels

    LMVM2277ST MICROWAVE OVEN POWER LEVELS Eleven power levels are available, from 0% to 100% in 10% increments. The magnetron output is not adjustable; that is, it is either on or off. To achieve lower power levels, a relay is used to cycle the magnetron on and off. A magnetron warm-up period of two seconds is included in each ON cycle.

  • Page 15: Care And Cleaning

    LMVM2277ST MICROWAVE OVEN CARE and CLEANING Cleaning the oven is easy. Always unplug the oven before cleaning the control panel to avoid touching too many buttons at once and damaging the microprocessor. OVEN EXTERIOR To clean the outside of the oven, use a soft cloth and spray glass cleaner. Spray the glass cleaner onto the cloth rather than onto the oven.

  • Page 16: Charcoal Filter

    LMVM2277ST MICROWAVE OVEN CHARCOAL FILTER If the oven is vented to the outside, the charcoal filter is not used. Leaving it in place will not cause a problem. If the oven recirculates the air back into the kitchen, the charcoal filter should be replaced every 6 ~ 12 months. It is not washable and must be replaced.

  • Page 17: Oven Light Replacement

    LMVM2277ST MICROWAVE OVEN OVEN LIGHT REPLACEMENT To replace the oven cooking cavity light, remove the vent grille screws (the two middle ones) and take out the wire cover. Open the door and tip the vent grille forward. Lift it out to remove it.

  • Page 18: Disassembly And Repair

    LMVM2277ST MICROWAVE OVEN DISASSEMBLY and REPAIR POWER BOARD and MAIN BOARD The main board and power board can be serviced without dismounting the oven. Remove the screws around the perimeter of the base plate. Disconnect the wiring harness for the lights and set the base aside.
  • Page 19 LMVM2277ST MICROWAVE OVEN This drawing shows the location of the main board (upper item) and the ventilation duct inside the microwave oven case. The latch board is the lower item. Remove the wires and connectors from the main board. Remove the screws that hold it in the case to change the board.

  • Page 20: Outer Case Removal

    LMVM2277ST MICROWAVE OVEN OUTER CASE REMOVAL These instructions assume you are removing, replacing, or servicing an oven that has been installed. If it is a new oven, be sure to remove two screws and the mounting bracket from the back of the oven before proceeding.

  • Page 21: Door Interlock Switches

    LMVM2277ST MICROWAVE OVEN DOOR INTERLOCK SWITCHES Disconnect the interlock switches. Remove the two screws attaching the switch to the front of the oven. (You’ll ® need a Torx T-20T (Tamperproof) bit. After replacing the switch, perform a microwave leakage check.

  • Page 22: Interlock Switch Continuity Test

    LMVM2277ST MICROWAVE OVEN INTERLOCK SWITCH CONTINUITY TEST The door interlock switches should click audibly when the door is opened or closed. If the latches do not activate the switches properly, they can be adjusted. PRIMARY and SECONDARY SWITCHES Disconnect the wire lead from the switch. Connect an ohmmeter to the COM (common) and NO (normally open) terminals of the switch.

  • Page 23: Magnetron Removal And Replacement

    LMVM2277ST MICROWAVE OVEN MAGNETRON REMOVAL and REPLACEMENT Remove the outer case. (See page 18.) Remove the damper bracket. Disconnect the transformer lead wire. Remove the four screws securing the transformer. Remove two screws securing the fan motor. Remove four screws securing the magnetron and lift it out carefully.

  • Page 24: Door Removal

    LMVM2277ST MICROWAVE OVEN DOOR REMOVAL Remove the two vent grille mounting screws. Remove the door hinge screws. Remove the wire cover and open the hinge covers. Open the door. Remove the vent grille. Disconnect the two flat cables at the face plate connectors.

  • Page 25: Door Disassembly

    LMVM2277ST MICROWAVE OVEN DOOR DISASSEMBLY Remove the four screws securing the choke cover to the door. Separate them carefully using a small screwdriver or a knife. Remove the two screws securing the handle. Remove the door frame. Remove the two screws securing the PCB (Printed Circuit Board.)

  • Page 26: Flat Plastic Connector

    LMVM2277ST MICROWAVE OVEN FLAT PLASTIC CONNECTOR The flat plastic connector (FPC) is opened and closed by moving the plastic slide at the top to release or secure the flat cable. To release the cable, pull the latch away from the connector.
  • Page 27 LMVM2277ST MICROWAVE OVEN VENTILATION FAN MOTOR REPLACEMENT If the oven has not been installed, be sure the mounting bracket has been removed from the back of the oven. Remove the two screws securing the blower plate cover. (One on the top and one on the back.)

  • Page 28: Vent Fan Motor Replacement

    LMVM2277ST MICROWAVE OVEN TURNTABLE MOTOR REPLACEMENT (With Oven Installed) Remove the glass tray and all other parts of the turntable assembly. Pull the turntable drive arm off the motor shaft. Remove the base plate by removing eight screws along its perimeter.

  • Page 29: Component Test Procedures

    LMVM2277ST MICROWAVE OVEN COMPONENT TEST PROCEDURES TRANSFORMER TEST To test the transformer, remove all leads to take it out of the circuit. Measure the resistance between the following points: Meter scale Rx1 0.2 ~ 1.0 Ω Primary (A & B) – High 0.2 ~ 1.5 Ω...

  • Page 30: Capacitor

    LMVM2277ST MICROWAVE OVEN CAPACITOR Remove the wire leads. They may be equipped with press-tab releases. Measure the resistance between the following points: Meter scale Rx1000 Terminal to terminal Normally indicates several ohms, then gradually drifts toward infinity. Terminal to case...

  • Page 31: Relay

    LMVM2277ST MICROWAVE OVEN RELAY Test the relay by removing its connector and measuring the continuity between the terminals. Operate the oven for 1 minute at power level 5 (50%). The relay should energize for 12 seconds and release for 10 on a continuous cycle.

  • Page 32: Component Test Procedures (Continued)

    LMVM2277ST MICROWAVE OVEN HIGH VOLTAGE DIODE Measure the continuity in both directions using meter scale Rx1000. Forward: Normal = continuity Defective = infinity Reverse: Normal = infinity Defective = continuity CAUTION! Be sure to discharge the capacitor before attempting to...

  • Page 33: Turntable Motor

    LMVM2277ST MICROWAVE OVEN TURNTABLE MOTOR Remove the connector and measure the resistance across the terminals using meter scale Rx1000. Normal = 2.3 ~ 3.5 kΩ Defective = any other reading VENTILATION FAN / MOTOR Unplug the connector and read the resistance between the various terminals using meter scale Rx1.

  • Page 34: Stirrer Fan Motor

    LMVM2277ST MICROWAVE OVEN STIRRER FAN MOTOR Remove the connector and measure the resistance across the terminals using meter scale Rx1000. Normal = 120 ~ 135 Ω Defective = any other reading (See page 21.) The turntable (left) and stirrer fan motors (right) look similar but are not interchangeable.

  • Page 35: Microwave Leakage Test Procedure

    If the oven is operational, it should be checked for microwave leakage before servicing begins. The standard for microwave emission is 5mW/cm LG’s voluntary standard is much lower at 1mW/cm . A microwave leakage test MUST be performed after the oven is serviced for any reason.

  • Page 36: Microwave Power Test Procedure (Traditional Method)

    LMVM2277ST MICROWAVE OVEN MICROWAVE POWER – TRADITIONAL METHOD Magnetron output and microwave power tend to deteriorate with age. To determine whether an oven’s output is within specification, use the following formula and procedure. FORMULA P = 4.187 Mw (T2-T1) + 0.55 Mc (T2-T0)

  • Page 37: Microwave Power - Alternate Method

    LMVM2277ST MICROWAVE OVEN MICROWAVE POWER - ALTERNATE METHOD Several methods have been used to measure the output of microwave ovens over the past years. In order to assure accuracy and consistency among the testers the following method is recommended. The procedure is to measure and record the average Celsius temperature rise of 2 liters of water cooking on High Power for 2 minutes.
  • Page 38 LMVM2277ST MICROWAVE OVEN Example: Starting Average Temperature of the 2 beakers = 20º C Ending Temperature of the 1 beaker = 36.5º C Ending Temperature of the 2 beaker = 32.5º C Beaker 36.5° C Beaker 32.5° C Total 69.0° C Average the sum by dividing by 2 69 ÷...
  • Page 39 LMVM2277ST MICROWAVE OVEN Note: Power output measurements should never be made on microwave ovens operating on less than 108 V . Below this point the power output drops sharply in an unpredictable manner. Likewise, operating an oven at voltages greater than 132 V should be avoided as damage to components may occur due to excessive electrical pressure.

  • Page 40: Checkout Procedures

    LMVM2277ST MICROWAVE OVEN CHECKOUT PROCEDURES BLOWN FUSE PROBLEM SOLUTION Fuse blows immediately when door is Improper operation of primary and closed. secondary interlock switches and/or monitor switch. Check and adjust as necessary. Fuse blows immediately when door is opened. Fuse blows immediately when START Malfunction of high voltage transformer is pressed with door closed.

  • Page 41: Relay

    LMVM2277ST MICROWAVE OVEN RELAY Fan turns on when door is closed but START is not pressed. Fan does not turn on when door is closed and START is pressed. LMVM2277ST Page 39 TRAINING MANUAL...
  • Page 42 LMVM2277ST MICROWAVE OVEN RELAY, continued Oven lamp turns on when door is closed without pressing START. Oven lamp does not turn on when door is closed and START is pressed. LMVM2277ST Page 40 TRAINING MANUAL...

  • Page 43: Troubleshooting Flow Charts

    LMVM2277ST MICROWAVE OVEN TROUBLESHOOTING FLOW CHARTS Before starting the troubleshooting charts, check to see if the oven is operable. For display problems, use charts A, B, and C. If the oven does not heat, try charts D and E. If the ventilation fan does not operate, use chart F.

  • Page 44: Chart B - Power, Doesn't Run

    LMVM2277ST MICROWAVE OVEN TROUBLESHOOTING FLOW CHARTS, continued CHART B (POWER, BUT DOESN’T RUN) Check the continuity of connector CN3 between pins 1 (PK-pink) and 3 (BL- black) when the door is closed. LMVM2277ST Page 42 TRAINING MANUAL...

  • Page 45: Chart C - Runs, No Heat

    LMVM2277ST MICROWAVE OVEN TROUBLESHOOTING FLOW CHARTS, continued CHART C (RUNS, BUT NO HEAT) Check to make sure the fan motor runs when START/ENTER is pressed. If the fan doesn’t run, check the resistance of the fan motor. Pins A and C – 16 Ω ±2 Ω...

  • Page 46: Chart D - Counts Down, No Heat

    LMVM2277ST MICROWAVE OVEN TROUBLESHOOTING FLOW CHARTS, continued CHART D (COUNTS DOWN, BUT NO HEAT) Check the primary and secondary interlock switches. Check both thermostats (TCO) for the oven cavity and the magnetron. Either switch could render the oven inoperable. Check Relay 8.
  • Page 47 LMVM2277ST MICROWAVE OVEN TROUBLESHOOTING FLOW CHARTS, continued CHART D, continued Check the resistance of the high voltage transformer. (See page 27.) Check the high voltage capacitor. (See page 28.) Check the high voltage diode. (See page 30.) LMVM2277ST Page 45...

  • Page 48: Chart E - No Beeper (Buttons Or End Of Cycle)

    LMVM2277ST MICROWAVE OVEN TROUBLESHOOTING FLOW CHARTS, continued CHART E (NO SOUND AT BUTTON OPERATION OR END OF CYCLE) Check the PCB (Printed Circuit Board) and all connectors. LMVM2277ST Page 46 TRAINING MANUAL...

  • Page 49: Check The Power Supply

    LMVM2277ST MICROWAVE OVEN TROUBLESHOOTING FLOW CHARTS, continued CHART F CHECK THE POWER SUPPLY. Check the ventilation fan for proper operation. LMVM2277ST Page 47 TRAINING MANUAL...

  • Page 50: Main Board

    LMVM2277ST MICROWAVE OVEN MAIN BOARD Main Relay Connector CN5 (10 Pin) Oven Light Connector Main Door PCB Connector Oven AB Humidity Sensor Relay Connector Cooktop Lights & Vent Motor Connector Secondary switch Power Relay 3-Tap CN6 (14 pin) Power Relay...

  • Page 51: Exploded View

    LMVM2277ST MICROWAVE OVEN EXPLODED VIEW LMVM2277ST Page 49 TRAINING MANUAL...

  • Page 52: Exploded View - Case Parts

    LMVM2277ST MICROWAVE OVEN EXPLODED VIEW LMVM2277ST Page 50 TRAINING MANUAL...

  • Page 53: Exploded View - Safety Switched

    LMVM2277ST MICROWAVE OVEN EXPLODED VIEW LMVM2277ST Page 51 TRAINING MANUAL...

  • Page 54: Exploded View - Internal Parts

    LMVM2277ST MICROWAVE OVEN EXPLODED VIEW LMVM2277ST Page 52 TRAINING MANUAL...

  • Page 55: Exploded View - Air Duct, Fan, Sensor, And Wiring Parts

    LMVM2277ST MICROWAVE OVEN EXPLODED VIEW LMVM2277ST Page 53 TRAINING MANUAL...

  • Page 56: Exploded View - Installation Parts

    LMVM2277ST MICROWAVE OVEN EXPLODED VIEW 65862D 63300M 65862B 63861A LMVM2277ST Page 54 TRAINING MANUAL...

  • Page 57: Model And Serial Numbers

    LMVM2277ST MICROWAVE OVEN MODEL AND SERIAL NUMBERS [Example] 801KW3400251 8 0 1 K W 0 0 2 5 1 Production Number [Internal code] Made in Korea Manufactured January 2008 Newer Style With Barcode New Serial Code (ETA Mid 2008) 12345 KR 406 YP 000002 + Options...

  • Page 58: Parts List

    LMVM2277ST MICROWAVE OVEN PARTS LIST Loc # Part No Description MFL37191403 Manual, Owners MFL06272504 Manual, Service MFL06208702 Manual, Installation MEZ37728002 Label, Cooking Guide *06-1 4922W5A060A Card, Template *06-2 MBM38968801 Card, Template MAY39948401 13213A ADV32254902 Frame Assembly, Door 13536A 3536W1A007G Tape, Sealing...
  • Page 59 LMVM2277ST MICROWAVE OVEN Loc # Part No Description 34930W 4B72510F Holder, Wire 34960A MCK36305401 Cover, Motor 349861 4350W4A007J Gasket (Turntable drive shaft) 35026A MHL38867201 Shelf (Wire rack) 35230A MDJ37601501 Filter, Grease (2 each) 35889A 5889W1A014B Turntable Assembly (Rotating ring) 36549S...

  • Page 60: Model Number / Serial Number Decoding Chart

    LMVM2277ST MICROWAVE OVEN Loc # Part No Description 56170G 6010W2L003D Transformer, power 56201A 2B72130F Filter, AC Line 56324A 6324W1A001S Magnetron 2M282H 56411A 6411W1A014T Power Cord Assembly (1.6 m/ 4 ft.) 56501A 6501W1A013A Sensor Assembly Motor, AC Synchronous (stir fan) 56549B 6549W1S002G 21 V, 180 MA, 34.9 RPM...

  • Page 61: Supplemental Materials

    LMVM2277ST MICROWAVE OVEN OHM’S LAW and WATT’S LAW P = WATTS I = AMPERES Watts = Volts x Ohms Amperes = Volts / Ohms Watts = Amperes x Ohms Amperes = Watts / Volts Watts = Volts x Amperes Amperes = E I •...

  • Page 62: Conversion Information

    LMVM2277ST MICROWAVE OVEN CONVERSION INFORMATION FORMULAE °F = (9/5) °C + 32 °C = (5/9) x (°F – 32) LMVM2277ST Page 60 TRAINING MANUAL...
  • Page 64 OTR Microwave - Spring 2008...

Table of Contents