Related Manuals for LG GoldStar MA-1302S
Summary of Contents for LG GoldStar MA-1302S
- Page 1 http://www.LGEservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MA-1302S 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 ITEM DESCRIPTION MA-1302S MODEL 120 Volts AC 60 Hz Power Requirement 1,550 Watts (13.6A) Single phase, 3 wire grounded 1,150 Watts full microwave power (IEC705) Power Output 2,450 MHz Microwave Frequency 2M246 Magnetron 0 ~ 99 min. 99 sec. Timer "... -
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 For personal safety, this appliance must be fully a soft, damp cloth. Check for damage such as grounded at all times. -
Page 7: Operating Instructions
OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Display Window Control Panel Safety Door lock System Turntable Defrost Rack Rotating Ring CONTROL PANEL Defrost Sensor Cook Potato Beverage Fresh Vegetable Frozen Vegetable Frozen Entree Ground Meat Popcorn Sensor Sensor Reheat... -
Page 8: Operating Sequence
OPERATING SEQUENCE The following is a description of component functions 7. AUTO COOKING during oven operation. AUTO START STOP/CLEAR START COOK EZ ON 1. SETTING THE CLOCK START START START STOP/CLEAR TIMER EZ ON EZ ON For 3 seconds Time setting 8. -
Page 9: Schematic Diagram
SCHEMATIC DIAGRAM... -
Page 10: Circuit Description
CIRCUIT DESCRIPTION GENERAL DETAILS ¥ A high voltage of approximately 2100 volts AC is ¥ The low voltage transformer supplies the necessary generated in the secondary of the high voltage voltage to the micom controller when power cord is transformer which is increased by the action of the high plugged in. -
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 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 (ÆT) a load of (1000±5) g of potable water. - Page 14 D. PCB ASSEMBLY REMOVAL Remove choke cover cap 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 Tact switch PCB...
- Page 15 G. MAGNETRON REMOVAL 3) Remove the screw holding the high voltage transformer to the base-plate. 1) Disconnect the leadwire from the magnetron. 2) Carefully remove the mounting screws holding the I. FAN MOTOR ASSEMBLY REMOVAL magnetron and the waveguide. 3) Remove the magnetron AssÕy until the tube is clear 1) Discharge the high voltage capacitor.
- Page 16 K. REMOVING THE TURNTABLE MOTOR L. INTERLOCK SYSTEM 1) Remove the glass turntable. 1) INTERLOCK MECHANISM 2) Remove the rotating ring assÕy by hand. The door lock mechanism is a device which has 3) Remove the turntable motor cover. been specially designed to eliminate completely The turntable base cover is easily removed by microwave activity when the door is opened during pinching the six parts with wire cutting pliers.
- Page 17 M. INFRARED SENSOR 1) Remove the screw of the back and on the cavity. 2) Remove the screw of the holder. 3) Remove the Holder. 4) Remove the screw of sensor case. 5) Remove the sensor PCB AssÕy 6) Remove the reflector. Sensor Case Holder Reflector...
-
Page 18: 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-62 OR VP-532A-OF FOR MONITOR SWITCH TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH B. -
Page 19: 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 20 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 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...
- Page 22 COMPONENTS TEST PROCEDURE RESULTS RELAY 1 OF P.C.B. Cooking Start (Disconnect the 5 pin connector from P.C.B) See Schematic Diagram on page 4-3) RY1: Turn table, Fan Motor, Oven Lamp SENSOR Measure the resistance. Port Resistance (Wire leads removed) 1 and 2 Approx.
-
Page 23: Trouble Shooting
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 24 (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 25 (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 Replace fuse, Malfunction of the Check continuity 1. Fuse blows. Continuity. monitor switch. primary, monitor, of monitor secondary switch (with...
- Page 26 (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 27 (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.
- Page 28 (TROUBLE 6) Uneven cooking and error during sensor cook and temperature process. TEST PROCEDURE CONDITION CAUSE OR CORRECTION Remove the dirt from the Uneven cooking Dirt on the sensor filter filter. Check and adjust the ÒGuide sensorÓ stuck. ÒGuide sensorÓ Use suitable utensil.
-
Page 29: Exploded View
EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... - Page 30 DOOR PARTS 13581A 15006A 13536A 13552A 13213A 13720D 14026A 14890A 14970A 13650A WTT040...
- Page 31 CONTROL PANEL PARTS 24781S 268711 23572A 268712 23806C 249401 250201...
- Page 32 OVEN CAVITY PARTS 33112U WSZ185 948503 33416Z WTT028 340511 33052M WTT010 WSZ002 24890C 36549S 35889A WTP013...
- Page 33 LARCH BOARD PARTS 43501A WSZ085 466001 43500A 466003 466001...
- Page 34 SUCTION GUIDE PARTS 54974T 56549F 54974S WTT037 55900A 56201A WSZ002 50CZZH 54810C WSZ002...
- Page 35 INTERIOR PARTS WSZ002 54811A 56411A 568771 53551S 56501A 56930V 568772 WSZ002 35012A 56912B WSZ002 WSZ002 948501 56324A 948502 55262A...
- Page 36 BASE PLATE PARTS 56170D 63302L 647781 948502 63302R WTT030 WSZ002 647781 WTT021 63303L 63303R...
-
Page 37: Schematic Diagram Of P.c.b
SCHEMATIC DIAGRAM OF P.C.B. -
Page 38: Printed Circuit Board
PRINTED CIRCUIT BOARD... - Page 39 June, 1999 P/NO : 3828W5S0845 Printed in Korea...