Instruction/ maintenance manual of the product LRMM1430SW LG Electronics
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MICROW A VE OVEN SER VICE MANUAL MODEL : LRMM1430SW LRMM1430SB CAUTION BEFORE SERVICING THE UNIT , READ THE SAFETY PRECAUTIONS IN THIS MANUAL. website http://www.
-1- CAUTION W ARNING T O SER VICE TECHNICIANS PRECAUTIONS T O BE OBSER VED BEFORE AND DURING SER VICING T O A VOID POSSIBLE EXPOSURE T O EXCESSIVE MICROW A VE ENERGY a.
FOREWORD Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity. MECHANICAL SERVICE INFORMATION T ABLE OF CONTENTS 1.
-3- 1. ADJUSTMENT PROCEDURES To avoid possible exposure to microwave energy leakage, adjust the door latches and interlock switches, using the following procedure.
-4- LA TCH BOARD PRIMARY INTERLOCK SWITCH LA TCH LA TCH BOARD (A) (B) 0-1/64" 0-1/64" DOOR LA TCH SECONDARY INTERLOCK SWITCH MONITOR INTERLOCK SWITCH Figure 1-a Figure 1-b.
2. PRECAUTIONS ON INST ALLA TION (Figure 2) A. Plug the power supply cord into a 120 V AC, 60 Hz, single-phase power source with a capacity of at least 20 amperes. B. Since the unit weights about 38 lbs., be sure to place it on a sturdy and flat surface.
SPECIFICA TIONS Rated Power Consumption 1250W maximum Output 1200W maximum ( * IEC 60705 Rating standard) Adjustable 0W through 1200W, 10 steps Frequency 2,450 MHz 50 MHz Power Supply 120V 12V AC, 60Hz Rated Current 11 Amp.
6. OVERALL CIRCUIT DIAGRAM A. SCHEMA TIC DIAGRAM -7- Figure 3.
B. MA TRIX CIRCUIT FOR TOUCH KEY BOARD -8- Figure 4.
7. OPERA TING PROCEDURES A. CONTROL P ANEL Figure 5. -9- 1. Display. The Display includes a clock and indicators that tell you time of day, cooking time settings, and cooking functions selected. 2. Sensor Touch. This pad allows you to cook most of your favorite foods without having to select cooking times and power levels.
B. PANEL INSTRUCTIONS (Figure 5) The entire operation is done by simple touch control pads. (1) Display Window Numbers and letters explained in Figure 5 are shown in the display window (Vacuum Fluorescent Tube). (a) The Time in four digits (12-hour indication): 00 Hour 00 Minute.
C. EASY USE CHART (1) CLOCK 1. Touch STOP/CLEAR. 2. Touch CLOCK. 3. Touch numbers for correct time of day. 4. Touch CLOCK. (2) “HI-POWER” COOKING 1. Touch STOP/CLEAR. 2. Touch COOK TIME. 3. Touch numbers for desired cooking time. 4. Touch START. (3) “MULTI-STAGE” COOKING 1.
8. PROCEDURE FOR MEASURING MICROW A VE ENERGY LEAKAGE A. CAUTIONS (1) Be sure to check a microwave emission prior to servicing the oven if the oven is operative prior to servicing. (2) The service personnel should inform the manufacturer, importer, or assembler of any certified oven unit found to have a microwave emission level in excess of 5mW/cm.
D. MEASUREMENT WITH A FULLY ASSEMBLED OVEN (1) After all components, including the outer panels, are fully assembled, measure for microwave energy leakage around the door viewing window, the exhaust opening and air inlet openings. (2) Microwave energy leakage must not exceed the values prescribed below.
-14- 9. DISASSEMBL Y INSTRUCTIONS IMPORTANT NOTES: UNIT MUST BE DISCONNECTED FROM ELECTRICAL OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS, ADJUSTMENTS AND CONTINUITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED.
C. REMOVING CONTROL CIRCUIT BOARD (Figure 10) (1) Remove out case. (2) Remove door assembly. (3) Unfasten two screws. (4) Lift up and pull out control panel assembly carefully from the cavity. (5) Remove door frame. (6) Remove the F.P.C connector from the terminal socket.
-16- E. AIR GUIDE REMOVAL (Figure 12) (1) Separate cavity and base plate. (2) Unfasten the screws which hold the air guide in the base plate. (3) Unfasten the air guide from hook. F. POWER BOARD AND INVERTER MODULE AND SUCTION GUIDE (Figure 12) (1) Separate cavity and base plate.
-17- H. MAGNETRON REMOVAL (1) Disconnect the leadwire from the magnetron. (2) Carefully remove the mounting screws holding the magnetron at the waveguide. (3) Remove the magnetron from the waveguide. NOTE: 1. When removing the magnetron, make sure its dome does not hit any adjacent parts, or it may be damaged.
J . FAN MOTOR ASSEMBLY REMOVAL ( 1) Separate cavity and base plate. ( 2) Remove air and suction guide.. ( 3) Remove the two screws holding the fan motor ASSEMBLY to the suction guide ASSEMBLY . ( 4) Disconnect the wires and unfasten the screws. ( 5) Pull out the Fan motor from the suction guide.
-19- A. PRIMARY INTERLOCK SWITCH TEST When the door release button is depressed slowly with the door closed, an audible click should be heard at the same time or successively at intervals. When the button is released slowly, the latches should activate the switches with an audible click .
-20- CAUTIONS 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 VOLTAGE CAPACITOR AND REMOVING THE LEAD WIRES FROM THE INVERTER MODULE.
-21- COMPONENTS TEST PROCEDURE RESULTS SENSOR Normal: Approximately BK-RD: 5.2 Kohms RD-WH: 2.1 Kohms BK-WH: 2.1 Kohms Abnormal: Infinite or several *Sensor cooking condition 1. Oven should be plugged in at least 5 minutes before sensor cooking. 2. Room temperature should not exceed 95 ˚ F.
-22- COMPONENTS TEST PROCEDURE RESULTS RELAY FAN MOTOR (Wire leads removed) TURNTABLE MOTOR (Wire leads removed) Check for continuity of relay with an ohm-meter. (Remove lead wires from relay and operate the unit.) Measure the resistance. (Ohm-meter scale: R x 100) Measure the resistance.
-23- B. CHECKOUT PROCEDURES (1) CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE. Fuse blows immediately after the door is closed. Fuse blows immediately after the door is opened. Fuse blows when the door is closed and START key is touched.
-24- (2) CHECKOUT PROCEDURES FOR RELAY - PROBLEM (A) - FAN motor and oven lamp turn on without touching START key when the door is closed. Remove the mate connector of I/O CON from the circuit board d.
(3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board. (1) Check the input current. If the input current is more than 20A, check the magnetron and wiring. If the input current is less than 0.5 A, there is no input to the inverter.
-26- C. TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL.
-27- 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. One or more digits in the display are not lighting.
-28- CONDITION CHECK RESULT CAUSE REMEDY 1. Fuse blows. Continuity. No continuity. Continuity. Shorted contact at the primary switch. Replace fuse, primary, monitor switches, and RELAY of P.C.B Assembly. No continuity. Normal. Defective control PCB. Replace Inverter.
-29- CONDITION CHECK RESULT CAUSE REMEDY 1. Setting time does not count down when touching START pad. 2. Fan motor or oven lamp do not turn on. No continuity. Continuity. Continuity Defective Power PCB assembly. Loose connection. Replace Power PCB assembly.
-30- CONDITION CHECK RESULT CAUSE REMEDY No microwave oscillation. No continuity. Continuity. Defective PCB assembly. Replace PCB assembly. Disconnect the wire leads from relay and check continuity of relay. ( O perate the unit) Replace Inverter and Magnetron.
-31- INTRODUCTION EXPLODED VIEW.
-32- DOOR P ARTS 14970A 14026A WTP002 13806A 13213A 13552A 13536A 13581A 268711 WTP002 23506A 13551A 15006A.
-33- CONTROLLER P ARTS 268711 WTP002 23506A 13551A.
-34- OVEN CA VITY P ARTS 33112U WTT022 :Model LRMM 1430SW :Model LRMM 1430SB W107 33390G 35889A WSZ185 36549S WTP013 33052A 13806F 647781.
-35- LA TCH BOARD P ARTS WSZ085 43500A 466001 43501A 466003 466001.
-36- OVEN INTERIOR P ARTS WTT028 WTT021 54974T 56501A 56930V 56912B 43500A 56324A WSZ002.
-37- BASE PLA TE P ARTS 35264A 568772 568771 56549F 56851H 56201A 50FZZA 54980A 43501A 65006B 63302A WTT021 WTT028 WTT034 WSZ002 268712 WTT028 WTT028 WTT028 55900A 54974S 55238A 568711 56411A.
-38- REPLACEMENT P AR TS LIST LOC. NO. *01 3828W5A3194 MANUAL,OWNERS R *02 3828W5S3066 MANUAL,SERVICE R *10 3890W3W376B BOX,WHITE R 13213A 3213W0A008B DOOR FRAME ASSEMBLY R 13536A 3536W1A002A SEAL TAP.
-39- LOC. NO. WTP002 1TPL0302018 SCREW TAPPING,PAN HEAD R WTP013 1TPL0402418 SCREW TAPPING,PAN HEAD R WTT021 1TTL0402418 SCREW TAPPING,TRUSS HEAD R WTT028 1TTL0402818 SCREW TAPPING,TRUSS HEAD R WTT034 1TTL0403418 SCREW TAPPING,TRUSS HEAD R PART NO.
-40- LOC. NO. *01 3828W5A3340 MANUAL,OWNERS R *02 3828W5S3192 MANUAL,SERVICE R *10 3890W3W377A BOX,WHITE R 13213A 3213W0A008C DOOR FRAME ASSEMBLY R 13352A 3352W1A144A FRONT SCREEN S 13536A 3536W1A002A.
-41- LOC. NO. WTP002 1TPL0302018 SCREW TAPPING,PAN HEAD R WTP013 1TPL0402418 SCREW TAPPING,PAN HEAD R WTT021 1TTL0402418 SCREW TAPPING,TRUSS HEAD R WTT022 1TTL0402422 SCREW TAPPING,TRUSS HEAD R WTT028 1TTL0402818 SCREW TAPPING,TRUSS HEAD R WTT034 1TTL0403418 SCREW TAPPING,TRUSS HEAD R PART NO.
-42- SCHEMA TIC DIAGRAM OF P .C.B.
-43- PRINTED CIRCUIT BOARD KEY PCB MAIN PCB.
-44- P .C.B. P AR TS LIST LOC. PART NO. DESCRIPTION SPECIFICATION SVC ALTER NO. AR1 0RZ1503G610 RESISTOR,DRAWING 150KOHM 1/4W 5% 3216 BULK 8 PIN R BZ1 6908W3YA01C BUZZER TFM-57 CW NINGBO EAST PIEZO 2048HZ 70D R 6908W3YA01A C01 0CK1040K948 CAPACITOR,FIXED CERAMIC(HIGH DIELECTRIC) 0.
-45- LOC. PART NO. DESCRIPTION SPECIFICATION SVC ALTER NO. D61 0DD414809AA DIODE,SWITCHING 1N4148 ROHM TP26 DO35 100V 450MA 2A 3NS R D90 0DD414809AB DIODE 1N4148M PYUNG CHANG TP26 DO34 60V 0.5A 0 R D91 0DD414809AB DIODE 1N4148M PYUNG CHANG TP26 DO34 60V 0.
-46- LOC. PART NO. DESCRIPTION SPECIFICATION SVC ALTER NO. R38 0RD5601G608 RESISTOR,FIXED CARBON FILM 5.6K OHM 1/4 W 5% TA26 R R39 0RD1002F608 RESISTOR,FIXED CARBON FILM 10K OHM 1/6 W 5% TA26 R R45 0R.
P/NO : 3828W5S3066 May , 2003 Printed in Korea.
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