Related Manuals for LG MS-1905C
Summary of Contents for LG MS-1905C
- Page 1 MICROWAVE OVEN SERVICE MANUAL MODEL: MS-1905C CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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Page 2: Specifications
SPECIFICATIONS ITEM DESCRIPTION MODEL MS-1905C Power Requirement 230 Volts AC 50 Hz Single phase, 3 wire grounded Microwave 1,150W Power Output microwave power (IEC705): 750W Microwave Frequency 2,450 MHz Magnetron 2M214 - 39F, 2M218J, 2M254J Timer 0 ~ 60 min. -
Page 3: Control Panel
OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Control Panel Door Open Button Safety Door Lock System Turntable Rotating Rest CONTROL PANEL defrost 1. POWER CONTROL KNOB: Used to select the desired power level for cooking. 2. TIMER KNOB: Used to set the cooking time. 3. -
Page 4: Operating Sequence
OPERATING SEQUENCE Microwave Cooking 1. Open the oven door, place the food on the turntable in the oven, and close the oven door. 2. Set the microwave power selector to the desired power level. There are five power levels from 90W to MAX. -
Page 5: Schematic Diagram
SCHEMATIC DIAGRAM... -
Page 6: Circuit Description
CIRCUIT DESCRIPTION • 3.2 volts AC is generated from the filament winding of • As the door is closed, the contact of MONITOR the high voltage transformer. This 3.2 volts is applied SWITCH opens. This switch creates the short circuit to to the magnetron to heat the magnetron filament blow fuse during operation under abnormal condition. - Page 7 MICROWAVE OVEN SERVICE MANUAL MODEL: MS-1905C CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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Page 8: 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 9: Measurement With Outer Case Removed
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 10: 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 11: Pcb Assembly Removal
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 timer motor to the control panel. 3) Remove the timer motor. 4) Remove the power control knob. -
Page 12: Magnetron Removal
F. MAGNETRON REMOVAL G. SUCTION GUIDE MAIN ASSEMBLY 1) Disconnect the leadwire from the magnetron. NOTE: Suction Guide Main ASS’Y consists of Latch 2) Carefully remove the mounting screws holding the Board ASS’Y and Suction Guide ASS’Y. To repair any of magnetron and the waveguide. -
Page 13: Fan Motor Assembly Removal
I. FAN MOTOR ASSEMBLY REMOVAL Pull out suction guide Main ASS’Y NOTE: Suction Guide Main ASS’Y consists of Latch Board ASS’Y and Suction Guide ASS’Y. To repair any of them, should be removed first Suction Guide Main ASS’Y. 1) Disconnect the leadwire from fan motor. 2) Remove the fan. -
Page 14: High Voltage Capacitor And Diode Removal
M. INTERLOCK SYSTEM K. HIGH VOLTAGE CAPACITOR AND DIODE 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 the high voltage microwave activity when the door is opened during capacitor. -
Page 15: Interlock Continuity Test
INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-61 OR VP-531A-OF FOR MONITOR SWITCH TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH B. -
Page 16: 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 17: High Voltage Capacitor
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 18 COMPONENTS TEST PROCEDURE RESULTS MAIN FUSE Check for continuity of the fuse with an Normal Abnormal multi-meter. NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time.
- Page 19 COMPONENTS TEST PROCEDURE RESULTS Check for continuity of timer motor with an TIMER MOTOR Turn On Turn Off (Wire leads removed) ohm-meter. (Remove wire leads from timer motor) (2-3) Approx. 22 Kohm Note: A is timer ON, OFF (3-M) switch. B is power supply terminal of the timer motor.
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Page 20: Troubleshooting
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. CAUTIONS 1. Check grounding before checking for trouble. 2. - Page 21 (TROUBLE 1) Oven lamp does not turn on when the timer knob is pushed with door closed. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of the Replace fuse, Check continuity 1. Fuse blows. Continuity. monitor switch. primary, monitor of monitor and secondary switch (with switches.
- Page 22 CONDITION CHECK RESULT CAUSE REMEDY No continuity. Check the Malfunction of the replace. continuity of the timer switch. timer switch contacts. Check the No continuity. continuity of the Faulty thermostat. replace. thermostat. (TROUBLE 3) Output power is low. CONDITION CHECK RESULT CAUSE REMEDY...
- Page 23 (TROUBLE 4) Oven does not cook at all even though turntable rotates. CONDITION CHECK RESULT CAUSE REMEDY No microwave Replace the power Malfunction of the Check the No continuity. oscillation. control switch. power control power control switch. switch(cooking state). Continuity. Check H.V.
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Page 24: Exploded View
EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS SUCTION GUIDE MAIN PARTS CONTROL PANEL PARTS... -
Page 25: Door Parts
DOOR PARTS 13552A 13536A 13213A 14026A 14970A 13352A 13720D 13581A... - Page 26 CONTROL PANEL ASSEMBLY PARTS WTP015 249401 23572A 249401 26549T WTP015 24510L 24970A 250201 24781T...
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Page 27: Oven Cavity Parts
OVEN CAVITY PARTS WTT021 33112U WTT021 30RMZZ WTT021 948502 968101 33052M WSZ092 33390G 948501 34960A 35889A 34036W 36549S 368771 WTP013... - Page 28 SUCTION GUIDE PARTS WSZ084 WTT028 50FZZA 56912B 56201A 56930V 43500A 568771 55900A 466001 466003 54974S 969201 WTT037 WTT028 56549F 43501A 466001 WSZ085 WTT028...
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Page 29: Interior Parts
INTERIOR PARTS WSZ062 56411A 56201B 56324A WSZ002... -
Page 30: Base Plate Parts
BASE PLATE PARTS 56851C 50CZZH 54810C 56851D 56170D WSZ062 63302A 647781 63303A 948503 WTT028 647781 WSZ002...