Related Manuals for LG MB-308DDD
Summary of Contents for LG MB-308DDD
- Page 1 MICROWAVE/ GRILL OVEN SERVICE MANUAL MODEL: MB-308DDD CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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Page 2: 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, Multimeter) Standard tools are listed below. Microwave survey meter — Holaday HI-1500, HI-1501 Diagonal pliers — Narda 8100, 8200 Long nose pliers Inch scale Cross head screwdriver... - Page 3 MEASUREMENT WITH THE OUTER NOTES WHEN MEASURING CASE REMOVED Do not exceed meter full scale deflection. When you replace the magnetron, measure The test probe must be removed no faster than, microwave energy leakage before the out case is 1 inch/sec (2.5 cm/sec) along the shaded area, oth- installed and after all necessary components are erwise a false reading may result.
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Page 4: Measurement Of Microwave Power Output
Measurement of Microwave Power Output Microwave power output measurement is made The microwave power output P in watts is calculat- with the microwave oven supplied at its rated volt- ed from the following formula: age and operated at its maximum microwave 4187 (∆... - Page 5 D. DOOR GROSS ASSEMBLY REMOVAL E. HIGH VOLTAGE TRANSFORMER REMOVAL 1) Remove screws of the hinge-L. 2) Open door and remove door assembly from hinge-U. 1) Discharge the high voltage capacitor. 2) Disconnect the leadwire from magnetron, high NOTES voltage transformer, and H.V capacitor. 1.
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Page 6: Magnetron Removal
H. AIR DUCT ASSEMBLY AND OVEN J. REMOVING THE TURNTABLE MOTOR LAMP REMOVAL 1) Remove the turntable. 2) Remove the turntable shaft VERY CAREFULLY 1) Disconnect the leadwire from oven lamp and ther- with a slotted screwdriver. mostat. 3) Lay the unit down on its back. 2) Remove the mounting screw to the magnetron. -
Page 7: Pcb Assembly Removal
K. PCB ASSEMBLY REMOVAL L. INTERLOCK SYSTEM 1) Remove the control panel assembly from the 1) INTERLOCK MECHANISM cavity. The door lock mechanism is a device which has 2) Remove screw which holding the PCB SUB ASM been specially designed to completely eliminate to the control panel. -
Page 8: Interlock Continuity Test
Interlock Continuity Test WARNING: FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. SZM-V16-FA-63 OR VP-533A- OF FOR PRIMARY SWITCH TYPE NO. SZM-V16-FA-62 OR VP-532A- OF FOR MONITOR SWITCH TYPE NO. SZM-V01-FA-33 OR VP-133A- OF FOR SECONDARY SWITCH A. -
Page 9: Component Test Procedure
Component Test Procedure CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUT 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 10 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis Filamet Terminals 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. Measure the resistance. HIGH VOLTAGE Normal: Momentary indi- CAPACITOR (Multi-meter scale: Rx1000)
- Page 11 COMPONENTS TEST PROCEDURE RESULTS HEATER ELEMENT Measure the resistance. Normal : (Wire leads removed.) (Multi-meter scale: RX1) Gill heater Approx.55 Ω (at 20-30°C) Normal : Measure the resistance with 500V-100M more than 0.5M Ω ohm insulation resistance meter. NOTE : Make sure heater is fully cooled when tested. 0°C~Approx 150°C Approx150°C MAGNETRON THERMOSTAT...
- Page 12 COMPONENTS TEST PROCEDURE RESULTS RELAY OF P.C.B. Cooking Start (Disconnect the 5 pin CN 2 connector from P.C.B.) RELAY 2, RELAY 3 Cooking Start OF P.C.B (Wire leads removed.) Relay 1 Note: Relay Relay 1: Fan motor Turntable motor Oven lamp Relay 2: Microwave Relay 3: Grill Relay 2...
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Page 13: Troubleshooting
Trouble Shooting WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE EDUCATE 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 14 (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 more numbers in display. 4.
- Page 15 (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 Malfunciton of the Replace primary, Check continuity 1. Fuse blows. Continuity. monitor switch. and monitor of monitor switch.
- Page 16 (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 sec- Replace sec- Check continuity 1. Setting time No continuity. ondary switch.
- Page 17 (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. oscilation. assembly. assimbly. wire leads from relay 2 and check continuity of relay 2.
- Page 18 (TROUBLE 6) Oven does not cook properly when programmed for the set power level (Operates properly on HIGH) CONDITION CHECK RESULT CAUSE REMEDY Defective PCB Replace PCB Output is full when Disconnect the Abnormal. assembly. assembly. you set lower wire leads from power level.
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Page 19: Exploded View
EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROLLER PARTS... -
Page 20: Door Parts
1. DOOR PARTS... -
Page 21: Control Panel Parts
2. CONTROL PANEL PARTS... - Page 22 3. OVEN CAVITY PARTS 33112U WTT021 WTT021 54974A WSZ002 34774U WSZ059 35300A 348101 35300A 33052M 35301A WTT010 33461Z 35026G 349601 33390G 34370T 36549S 35889A WTP013...
- Page 23 4. LATCH BOARD PARTS 43500A 466001 466001 WSZ002 466003 466001 WSZ084 WTT028...
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Page 24: Interior Parts
5. INTERIOR PARTS WSZ002 WSZ062 WSZ112 56912B 56930G 56411A WSZ002 56930V 54826A 948501 55263A 948502 56324A WTT028 55006F WSZ002 54810C WSZ002 50FZZA 568711 WTT028 948503 50CZZH 56549F WTT037 56930M 56549S 55900A 56851D WSZ002 56851C... -
Page 25: Base Plate Parts
6. BASE PLATE PARTS 56170D 63302A 34774U WTT002 647781 WSZ085 WTT030 WSZ002 WSZ062... -
Page 26: Packing And Accessories
PACKING AND ACCESSORIES PACKING UPPER PE FILM PACKING TABLE-2 GRILL RACK GLASS TRAY FILAMENT PE BAG TAPE PRINTING MATERIAL ROTATING RING PACKING BASE PACKING TABLE-1...