Related Manuals for LG MB-319ML
Summary of Contents for LG MB-319ML
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Page 1: Microwave Oven
MICROWAVE OVEN SERVICE MANUAL MODEL : MB-319ML MB-319MLA 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 (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1... -
Page 4: Specifications
SPECIFICATIONS DESCRIPTION ITEM MB-319ML MB-319MLA MODEL 120 Volts AC 60 Hz 220 Volts AC 60 Hz Power Requirement MICROWAVE 1,400 Watts (12.0) GRILL 1,050 Watts Single phase, 2-wire grounded Power Output 1,000 Watts full microwave power (IEC60705) Microwave Frequency 2,450 MHz... -
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 EARTHING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with This microwave oven is designed to be used in a fully a soft, damp cloth. Check for damage such as earthed condition. -
Page 7: Operating Instructions
OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Display Window Control Panel Door Open Button Safety Door Lock System Turntable Rotating Ring Grill Rack Metal Tray Turntable Shaft CONTROL PANEL 1. BRAZILLIAN COOK : This menu has been pre programmed to cook food automatically by one touch. -
Page 8: Operating Sequence
OPERATING SEQUENCE 7. AUTO WEIGHT DEFROST COOKING The following is a description of component functions during oven operation. Dial Desliga/Cancela Auto Descongela Liga (Number) 1. SETTING THE CLOCK 8. CHILD LOCK Desliga/Cancela Manual Dial Liga This oven has a CHILD LOCK feature TO SET CHILD LOCK •... -
Page 9: Schematic Diagram
SCHEMATIC DIAGRAM... -
Page 10: Circuit Description
CIRCUIT DESCRIPTION • A high voltage of approximately 2100 volts AC is GENERAL DETAILS generated in the secondary of the high voltage transformer which is increased by the action of the high • The low voltage transformer supplies the necessary voltage diode and charging of the high voltage voltage to the micom controller when power cord is capacitor. -
Page 11: Service Information
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 12: Measurement With A Fully Assembled Oven
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 13: 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 14 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 ASSEMBLY to the control panel. 3) Disconnect the flat cable from the PCB SUB ASSEMBLY and take off the PCB SUB ASSEMBLY.
- Page 15 F. MAGNETRON REMOVAL G. REMOVING THE TURNTABLE MOTOR 1) Remove the turntable and rotating ring. 1) Disconnect the leadwire from the magnetron. 2) Lay the unit down on its back. 2) Carefully remove the mounting screws holding the 3) Remove the turntable motor cover. magnetron and the waveguide.
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Page 16: Diode Removal
H. HIGH VOLTAGE TRANSFORMER K. INTERLOCK SYSTEM REMOVAL 1) INTERLOCK MECHANISM The door lock mechanism is a device which has 1) Discharge the high voltage capacitor. been specially designed to eliminate completely 2) Disconnect the leadwire from magnetron, high voltage microwave activity when the door is opened during transformer, and capacitor. -
Page 17: Interlock Continuity Test
INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. ALL THESE SWITCHES MUST BE REPLACED AT THE SAME TIME. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH TYPE NO. -
Page 18: Component Test Procedure
COMPONENT TEST PROCEDURE 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 WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. - Page 19 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis 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. Normal: Momentarily indicates CAPACITOR (Ohm-meter scale: Rx1000) several ohms, and...
- Page 20 COMPONENTS TEST PROCEDURE RESULTS HEATER ELEMENT Measure the resistance. Normal: (Wire leads removed.) (Multi-meter scale:RX1) Gill heater Approx.15 ½ (at 20-30ûC) Normal: Measure the resistance with 500V-100M more than 1.0M ½ Ohm insulation resistance meter. NOTE: Make sure heater is fully cooled when tested. 0ûC~Approx 180ûC Approx 180ûC MAGNETRON...
- Page 21 COMPONENTS TEST PROCEDURE RESULTS Check for continuity of relay 2 with an RELAY 2 POWER ohm-meter. LEVEL (Remove wire leads from relay 2 and operate the unit.) 4 sec 18 sec 6 sec 16 sec 8 sec 14 sec 10 sec 12 sec 12 sec 10 sec...
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Page 22: Troubleshooting
TROUBLESHOOTING 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. CAUTIONS 1. Check grounding before checking for trouble. 2. - Page 23 (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 24 (TROUBLE 2) Oven does not operate at all, display window does not display any figures, and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of the Replace fuse, Check continuity 1. Fuse blows. Continuity. primary, monitor, monitor switch. of monitor secondary switch (with...
- Page 25 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Defective Replace Check continuity 1. Setting time No continuity. secondary switch. secondary switch.
- Page 26 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY No microwave Defective PCB Replace PCB Disconnect the No continuity. oscillation. assembly. assembly. wire leads from relay 2 and check continuity Continuity.
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Page 27: Exploded View
EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... -
Page 28: Door Parts
DOOR PARTS 13581A 15006A 13552A 13536A 13213A 14890A 13720D 14026A 14970A... -
Page 29: Controller Parts
CONTROLLER PARTS 268711 24781S 268712 WTT028 250205 23572A 250202 WTP004 23790D 250203 249401 250204 24510L 243501 24970A 250201... -
Page 30: Oven Cavity Parts
OVEN CAVITY PARTS 33112U WTT021 948504 33550H 33052M WNZ015 340511 WTT010 35300S 35026G 33390G WSZ184 34036W 34370T 35889A 36549S 948501 33390M WTP013... - Page 31 LATCH BOARD PARTS 43501A WSZ085 466001 43500A 466003 466001...
- Page 32 INTERIOR PARTS 568771 56411A 56930V 50FZZA 56930V 54826A 55006F 56549F WTT028 54974S WSZ002 WSZ002 55900A WTT037 34930W 35012A WSZ002 948502 56324A 50CZZH 56912B WSZ002 WSZ002 56851D 55262A 54810C WTT028...
- Page 33 BASE PLATE PARTS 63303L 56170D 63302L 948503 647781 WTT028 63302R WSZ002 368771 63303R WTT021...
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Page 34: Replacement Parts List
REPLACEMENT PARTS LIST LOC. PART NO. DESCRIPTION ALTER 3828W5A1811 MANUAL,OWNERS 3828W5S1726 MANUAL,SERVICE 3850W3D065A LABEL,COOKING GUIDE 13213A 3213W1A028B DOOR FRAME ASSEMBLY 13536A 3536WRA001L SEAL TAPE 13552A 3552W1A037A CHOKE COVER 13581A 3581W1A250B DOOR ASSEMBLY 13720D 3720W0D180C PANEL,DOOR 14026A 4026W2A012A LATCH 14890A 4890W1D039W GLASS 14970A 4970WRA001C... - Page 35 LOC. PART NO. DESCRIPTION ALTER 466003 3B73361E SWITCH,MICRO 6600W1K004B 466003 3B73361E SWITCH,MICRO 3B73361D 50CZZH 6120W3H003F CAPACITOR,DRAWING[HIGH VOLTAGE] 0CZZW1H002F 50FZZA 3B74133K FUSE,DRAWING 54810C 4810W4C003C BRACKET,CAPACITOR 54826A 4B70774A SPACER 54974S 4974W1S010A GUIDE,SUCTION 55006F 5006WRA002A CAP,FUSE 55262A 5262W2A041A DUCT 55900A 2B72125B 56170D 6170W1D061A TRANSFORMER,HIGH VOLTAGE 6170W1D023B 56170D...
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Page 36: Schematic Diagram Of P.c.b
SCHEMATIC DIAGRAM OF P.C.B. -
Page 37: Printed Circuit Board
PRINTED CIRCUIT BOARD... -
Page 38: P.c.b Parts List
P.C.B PARTS LIST LOC. PART NO. DESCRIPTION SPECIFICATION ALTER 0RZ4702G610 RESISTOR,DRAWING 47KOHM 1/4W 5% 3216 BULK 8 PIN 0CK1040K949 CAPACITOR,FIXED CERAMIC 0.1UF D 50V 80%,-20% F(Y5V) TA52 0CE2276H638 CAPACITOR,FIXED ELECTROLYTIC 220UF SMS,SG 25V 20% FM5 TP 5 0CE2276H638 CAPACITOR,FIXED ELECTROLYTIC 220UF SMS,SG 25V 20% FM5 TP 5 0CE2276H638 CAPACITOR,FIXED ELECTROLYTIC... - Page 39 LOC. PART NO. DESCRIPTION SPECIFICATION ALTER 0RD1001F609 RESISTOR,FIXED CARBON FILM 1K OHM 1/6 W 5% TA52 0RD1001F609 RESISTOR,FIXED CARBON FILM 1K OHM 1/6 W 5% TA52 0RD2700F609 RESISTOR,FIXED CARBON FILM 270 OHM 1/6 W 5% TA52 0RD1004F609 RESISTOR,FIXED CARBON FILM 1M OHM 1/6 W 5% TA52 0RD2202F609 RESISTOR,FIXED CARBON FILM...
- Page 40 Aug., 2002 P/NO : 3828W5S1726 Printed in Korea...