LG RCS10A Service Manual

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CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.
Microwave Oven
Service Manual
RCS10PBDA
RCS10MPA
RCS10A
RCS10MPSA
RCS10MPA
RFS12MPSA
RCS10MPSA
RCS10SW2A
RFS12G
RFS12SW2A
RFS12MPSA
RFS12G
R

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  Summary of Contents for LG RCS10A

  • Page 1 Microwave Oven Service Manual RCS10PBDA RCS10MPA RCS10A RCS10MPSA RCS10MPA RFS12MPSA RCS10MPSA RCS10SW2A RFS12G RFS12SW2A RFS12MPSA RFS12G CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
  • Page 2: Safety Precautions

    SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy. PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY...
  • Page 3: Table Of Contents

    CONTENTS CONTENTS (Page) (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1...
  • Page 4: Specifications

    SPECIFICATIONS SPECIFICA SPECIFICATIONS ITEM DESCRIPTION ITEM ITEM ITEM ITEM RCS10MPA / RCS10MPSA / RCS10A DESCRIPTION DESCRIPTION DESCRIPTION DESCRIPTION RFS12MPSA / RFS12G MODEL RCS10SW2A / RCS10PBDA RFS12SW2A RCS10MPA RCS10MPA RCS10MPA RCS10MPA RCS10MPSA RCS10MPSA RCS10MPSA RCS10MPSA RFS12MPSA RFS12MPSA RFS12MPSA RFS12MPSA RFS12G RFS12G...
  • Page 5: Cautions

    CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection.
  • Page 6: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING GROUNDING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with a For personal safety, this appliance must be fully soft, damp cloth. Check for damage such as grounded at all times.
  • Page 7: Operating Instructions

    Use to exit programming mode and stop pads. START cooking during cooking cycle. START Use to start ÒManual Time EntryÓ program or restart interrupted cooking cycle. Use to advance to next user option. Use to save times and power levels when programming pads. RCS10A...
  • Page 8: Features

    OPERATING INSTRUCTIONS FEATURES Window Door Screen Electronic Control Safety Door Lock System CONTROL PANEL Display Some items in display can be seen but will not glow. Pads TIME ENTRY Use to enter heating time without changing preprogrammed number pads. Pads 1-0 Use to begin heating with preprogrammed times and power levels or to enter times for “Manual Time Entry”...
  • Page 9 OPERATING INSTRUCTIONS FEATURES FEATURES Splatter Shields Window Door Screen Window Door Screen Electronic Control Electronic Control Door Open Button Safety Door Lock System Turntable Safety Door Lock System Rotating Ring CONTROL PANEL Display CONTROL PANEL Display Some items in display can be seen but will not glow. Some items in display can be seen but will not glow.
  • Page 10 OPERA TING INSTRUCTIONS FEATURES FEATURES Splatter Shields Window Door Screen Window Door Screen Electronic Control Electronic Control Door Open Button Safety Door Lock System Turntable Safety Door Lock System Rotating Ring CONTROL PANEL Display CONTROL PANEL Display Some items in display can be seen but will not glow. Some items in display can be seen but will not glow.
  • Page 11 OPERATING INSTRUCTIONS FEATURES FEATURES Splatter Shields Window Door Screen Window Door Screen Electronic Control Electronic Control Door Open Button Safety Door Lock System Turntable Safety Door Lock System Rotating Ring CONTROL PANEL Display CONTROL PANEL Display Some items in display can be seen but will not glow. Some items in display can be seen but will not glow.
  • Page 12 OPERATING INSTRUCTIONS FEATURES FEATURES Window Door Screen Window Door Screen Electronic Control Electronic Control Safety Door Lock System Safety Door Lock System CONTROL PANEL Display CONTROL PANEL Display Some items in display can be seen but will not glow. Some items in display can be seen but will not glow. TIME POWER ENTRY...
  • Page 13: Programming Displays

    Cooking Displays Cooking Displays Cooking Displays Cooking Displays Cooking Displays Shows when power is connected to oven. Open and close Shows when power is connected to oven. Open and close door to clear. door to clear. READY shows when oven control will accept entries. READY shows when oven control will accept entries.
  • Page 14: Operation

    Operation Preprogrammed Times and Cook Level CAUTION Pads Pads Pads Heating Heating Heating Times Times Times nterrupting Operation START STOP/RESET START Canceling Mistakes STOP/RESET STOP/RESET Operating Preprogrammed Pads Manual Time Entry TIME ENTRY Operating QTY 2X Pads START...
  • Page 15: Programming

    PROGRAMMING Preprogrammed Number Pads Multiple Heating Stages Oven has 10 preprogrammed number pads. Follow Follow instructions below to program oven to perform 3 instructions below to program heating times and power consecutive heating cycles without interruption. levels for customized cooking. 1.
  • Page 16 User Options 4. Press START pad to advance to next option. See table for options. Follow the instructions below to customized the microwave ovenÕs operation. End-of-cycle signal, 5. Press number pad (0,1-3) to change option. maximum heating time and other options can be 6.
  • Page 17: Schematic Diagram

    SCHEMATIC DIAGRAM 4-11...
  • Page 18: Circuit Description

    CIRCUIT DESCRIPTION GENERAL DETAILS • A high voltage of approximately 2100 volts AC is generated in the secondary of the high voltage • The low voltage transformer supplies the necessary transformer which is increased by the action of the high voltage to the micom controller when power cord is voltage diode and charging of the high voltage plugged in.
  • Page 19: Tools And Measuring Instruments

    SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. ¥ TESTER (VOLTS-DC, AC, Ohmmeter) Standard tools are listed below. ¥ Microwave survey meter ¥ Diagonal pliers - Holaday HI-1500 ¥ Long nose pliers HI-1501 ¥...
  • Page 20 MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED ¥ Do not exceed meter full scale deflection. ¥ The test probe must be removed no faster than ¥ When you replace the magnetron, measure for 1 inch/sec (2.5 cm/sec) along the shaded area, microwave energy leakage before the outer case is otherwise a false reading may result.
  • Page 21: Measurement Of Microwave Power Output

    MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with • The microwave power output P in watts is calculated the microwave oven supplied at its rated voltage and from the following formula : operated at its maximum microwave power setting with 4187 x (∆T) a load of (1000±5) g of potable water.
  • Page 22 Remove choke cover D. PCB ASSEMBLY REMOVAL Remove choke cover 1) Remove the control panel assembly from the cavity. (Refer to control panel assembly removal on previous page.) 2) Remove screws which hold the PCB SUB ASSÕY to the control panel. 3) Disconnect the flat cable from the PCB SUB ASSÕY and take off the PCB SUB ASSÕY PCB Sub Asm...
  • Page 23: Fan Motor

    F. MAGNETRON REMOVAL G. REMOVING THE STIRRER FAN MOTOR 1) Disconnect the leadwire from the magnetron. 2) Carefully remove the mounting screws holding the 1) Disconnect the leadwire from the stirrer fan motor magnetron and the waveguide. terminals. 3) Remove the magnetron ASS’Y until the tube is 2) Remove the screw securing the stirrer fan motor to clear from the waveguide.
  • Page 24: Diode Removal

    H. HIGH VOLTAGE TRANSFORMER K. INTERLOCK SYSTEM REMOVAL 1) INTERLOCK MECHANISM H. HIGH VOLTAGE TRANSFORMER K. INTERLOCK SYSTEM The door lock mechanism is a device which has 1) Discharge the high voltage capacitor. REMOVAL been specially designed to eliminate completely 1) INTERLOCK MECHANISM 2) Disconnect the leadwire from magnetron, high voltage microwave activity when the door is opened during...
  • Page 25: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. SZM-V 21-FC-93 FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FD-62 OR V-16-2C 25 FOR MONITOR SWITCH TYPE NO. SZM-V 16-FD-63 OR V-16-3C 25 FOR SECONDARY SWITCH B.
  • Page 26: Component Test Procedure

    COMPONENT TEST PROCEDURE COMPONENT TEST PROCEDURE CAUTIONS CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH OUTER CASE FROM THE UNIT.
  • Page 27: Test Procedure

    COMPONENTS TEST PROCEDURE RESULTS Antenna Antenna Gasket Gasket Chassis Chassis Filament Filament NOTE: When testing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition. HIGH VOLTAGE Measure the resistance.
  • Page 28 COMPONENTS TEST PROCEDURE RESULTS Check for continuity of relay 3 an RELAY 3 POWER ohm-meter. LEVEL (Remove wire leads from relay 3 and operate the unit.) 3 sec 9 sec 4 sec 8 sec 5 sec 7 sec 6 sec 6 sec 7 sec 7 sec...
  • Page 29: Trouble Shooting

    TROUBLE SHOOTING TROUBLE SHOOTING TROUBLE SHOOTING TROUBLE SHOOTING TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY.
  • Page 30 (TROUBLE 1) The following visual conditions indicate a probable defective control circuit. 1. Incomplete segments. ¥ Segment missing. ¥ Partial segment missing. ¥ Digit flickering (NOTE: Slight flickering is normal.) 2. Colon does not turn on or blink. 3. A distinct change in the brightness of one or more numbers in display. 4.
  • Page 31 (TROUBLE 2) Oven does not operate at all, Display window does not display any figures, Oven does not operate at all, Display window does not display any figures, (TROUBLE 2) Oven does not operate at all, Display window does not display any figures, and no input is accepted.
  • Page 32 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched.
  • Page 33 (TROUBLE 5) No microwave oscillation even though oven lamp and blower motor run. (Display operates properly) (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY CONDITION CHECK RESULT CAUSE REMEDY Disconnect the...
  • Page 34: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION MODEL : RCS10PBDA RFS12G OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...
  • Page 35 #EV# EXPLODED VIEW INTRODUCTION MODEL : RCS10A RCS10MPA RCS10MPSA RFS10SW2A RFS12MPSA RFS12SW2A OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...
  • Page 36: Door Parts

    #EV# DOOR PARTS MODEL : RCS10A RCS10MPA RCS10MPSA RCS10PBDA RFS10SW2A RFS12SW2A RFS12MPSA 1013 RFS12G 1005 1004 1385 1002 1000 W136 1006 1007 W105 W108 1384 1009 1386 W206 W207...
  • Page 37: Control Panel Parts

    #EV# CONTROL PANEL PARTS MODEL : RCSPBDA RFS12G 2012 W102 2381 2006 W130 2000 2005 2400...
  • Page 38 #EV# CONTROL PANEL PARTS MODEL : RCS10PBDA 2012 W102 2381 2006 2002 W130 2000 2005 2400...
  • Page 39 #EV# CONTROL PANEL PARTS MODEL : RCS10A RCS10MPA 2004 W102 2381 2006 2002 W130 2000...
  • Page 40 #EV# CONTROL PANEL PARTS MODEL : RCS10SW2A RCS10MPSA RFS10SW2A RFS12MPSA RFS12SW2A 2004 W102 2381 2006 W130 2000...
  • Page 41: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS MODEL : RCS10PBDA RCS10A RCS10MPA RCS10MPSA W158 RFS10SW2A 5045 RFS12SW2A W109 RFS12MPSA 3001 RFS12G W121 W109 W121 W105 3009 W109 5024 3004 9000 W109 7037 W108...
  • Page 42: Latch Board Parts

    #EV# LATCH BOARD PARTS MODEL : RCS10PBDA RCS10A RCS10MPA RCS10MPSA RFS10SW2A RFS12SW2A RFS12MPSA RFS12G 4001 W102 4003 4009 W117 4008 4002 4004 4000...
  • Page 43: Interior Parts

    #EV# INTERIOR PARTS MODEL : RCS10PBDA RCS10A RCS10MPA 5014 RCS10MPSA RFS10SW2A RFS12SW2A RFS12MPSA W108 RFS12G 5010 5201 W101 3381 W109 W108 5102 W109 5016 W136 9000 W101 W101 3028 3031 W109 5104 W108 W108 5103 W101 5202 W108 W101 W109...
  • Page 44: Base Plate Parts

    #EV# BASE PLATE PARTS MODEL : RCS10PBDA RCS10A RCS10MPA RCS10MPSA RFS10SW2A RFS12SW2A RFS12MPSA RFS12G 6001 W121 6000 3901 W162 3902 3026 W121 6013 W108 6-11...