LIGHT OVEN “SolarDOM” SERVICE MANUAL
Contents
1. 6 2 EV CONTROL PANEL PARTS e original amp replace with Part Supplied in Kit Must Change Simultaneausly Original P No 6871W1S074A 6871W1S260J 6871W1S112A n x amp ta 7 lt DY o 2 A 2 5 lt Dy IL 249401 p is v IL b 24 v HES 02 243501 Qg AA N i lt lt 2 IS EV OVEN CAVITY PARTS e discard original amp replace with Part Supplied in Kit amp Shaft EV LATCH BOARD PARTS 7 77 X 6 5 EV INTERIOR PARTS I 6 6 EV INTERIOR PARTS II 3888 ECS GE ME 2 zA 2 2 i 27 6 7 SCHEMATIC DIAGRAM M 9 IT UM Pg ii ult lale E 7 NS E 8 1 PRINTED CIRCUIT BOARD Key 1 VSLOVIAO LOS 8101 14 11188 8 2 PRINTED CIRCUIT BOARD Key 2 P PRESSEN SES IED Ni 23 CANCEL START 21 2112 Wii Feiz CANCEL START CLOCK 8 3 PRINTED CIRCUIT BOARD Power 22. 3 Do not block the vent and the air intake openings Blocking vent or air intake openings can cause damage to the oven and poor cooking results Make sure the microwave oven legs are in place to ensure proper air flow 4 The oven should not be installed in any area where heat and steam are generated because they may damage the electronic or mechanical parts of the unit Do not install the oven next to a conventional surface unit or above a conventional wall oven 5 Use the oven in an ambient temperature less than 104 F 40 C 6 Place the oven on a sturdy and flat surface at least 10 cm 4 inches from the wall 7 Place the oven as far away as possible from TV RADIO COMPUTER etc to prevent interference 8 Do not touch the front glass during or after cooking of the Grill and convection and Combination mode This glass is very hot during heater operating 9 Do not operate the oven at microwave and combination mode with Grill rack placed in the cavity when the oven is empty 10cm 3 1 EARTHING INSTRUCTIONS This oven is designed to be used in a fully earthed condition It is imperative therefore to make sure it is properly earthed before servicing WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT The wires in this mains lead are colored in accordance with the following code Green and yellow Earth Blue Neutral Brown Live As the colors of the wires in the mains lead of this applian
3. Speed combi Categories Co 1 Grill 1 Microwave Power Level Co 2 Grill 2 Microwave Power Level Co 3 Grill 3 Microwave Power Level Co 4 Upper Lower Heater Microwave Power Level Co 5 Convection Microwave Power Level Grill amp Convection amp Speed Combi Stop Functi Turn Dial geh Combi 1171011 Desired convection temp 40 C 100 C 250 C Desired Desired Enter power gt Enter gt cooking gt Start level time 7 DEFROST i Turn Dial Stop Function A Food Clear Defrost 1 le gt weight gt Start 8 SPEED COMBI COOK Function Turn Dial Stop Food gt Speed gt Desired speed Start Clear im cook bh weight 9 SPEED AUTO COOK Stop Function Turn Dial Food gt Auto Desired auto 7171 Start Clear cook cook category Weight 10 CHILD LOCK This oven has a CHILD LOCK feature To Set CHILD LOCK Stop Clear Stop Clear Touch and Hold To Cancel CHILD LOCK Stop Clear Stop Clear Touch and Hold 11 QUICK START Stop Clear Start Quick Start 12 FAVORITE MEMORY COOK To set Stop Clear Favorite gt mode To cook Favorite w Start FA 1 SCHEMATIC D
4. at dE ale amp 5591
5. 4 000 Volts DC is applied to the filament of the magnetron WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUM The micom controller controls the ON OFF time of relay 4 by the applied signal to vary the average output 4 4 power of oven as POWER LEVEL refer to 1 1 One complete cycle of relay 4 is 32 seconds WHEN THE DOOR IS OPENED DURING COOKING Both the primary switch and relay 4 are cut off primary winding voltage of the high voltage transformer ON OFF of relay 4 is coupled electrically with opening and closing of the secondary switch When the door is opened the secondary switch is opened and when the door is closed the secondary switch is closed The cooking time stops counting down Relay stops functioning As the door is opened if the contact of primary switch fails to open the fuse opens due to the large current surge caused by the monitor switch activation which in turn stops magnetron oscillation PRIMARY SWITCH FUSE HV TRANS SWITCH FORMER 1 SECONDARY RELAY A 9 9 Birch MICOM CONTROLLER LOO WHEN TOUCHING THE START BUTTON WITH THE HEATER COOKING FUNCTION SELECTED The contacts of the primary switch and the secondary switch close the circuit A C voltage is applied to the heater through thermostat as shown by the solid line THERMOSTAT j 81 HEATER RELAY
6. replacing the fuse If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time Replace just the fuse if the switches operate normally HEATER ELEMENT Measure the resistance Normal Multi meter scale Rx1 Upper sheath heater Approx 47 ohm 230V 1100W Lower sheath heater Approx 74 ohm 230V 700W Upper Ceramic heater Approx 27 ohm 120V 500W Upper Halogen heater Approx 2 7 ohm 120V 500W at 20 30 Wire leads removed Measure the resistance with 500V 100M ohm insulation resistance meter Normal more than 0 5 Mohm NOTE Make sure heater is fully cooled when tested MAGNETRON and OVEN OVEN Thermostat 0 160 THERMOSTAT M G T Thermostat O C Approx 145 C COMPONENTS TEST PROCEDURE RESULTS Disconnect the 4 pin connector from P C B Refer to schematic diagram Check for P C B connector Cooking Start RELAY P C B Wire leads removed Note Relay Relay 1 Fan motor Circulation motor Relay 2 Oven lamp Turntable motor Relay 3 P T C Relay Positive Temperature Coefficient Relay 4 Microwave Relay 5 Up sheath heater Relay 6 Lo sheath heater Relay 7 Halogen Ceramic Heater Relay 1 2 3 4 5 6 7 Cooking Start FAN MOTOR Wire leads removed Measure the resistance Ohm meter scale Rx 1 I Normal Approx 1
7. 5 6 7 Turntable rotates The fan motor rotates The air is also directed into the oven to exhaust the vapor in the oven through the base plate and back plate SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS Tools normally used for TV servicing are sufficient Standard tools are listed below Diagonal pliers Long nose pliers Phillips screwdriver Flat blade screwdriver Wrench size 5mm Nutdriver size 5mm Adjustable wrench Soldering iron Solder Vinyl insulation tape Polishing cloth MICROWAVE LEAKAGE TEST CAUTIONS Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing The service personnel should inform the manufacture importer or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW cm and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance If the oven operates with the door open the service personnel should Tell the user not to operate the oven Contact the manufacturer The service personnel should check all surface and vent openings for microwave leakage Check for microwave leakage after every servicing The power density of
8. 6 ohm Abnormal Infinite or several ohm TURNTABLE MOTOR Wire leads removed Measure the resistance Ohm meter scale R x 1000 Normal Approx 10 20 kohm Abnormal Infinite or several ohm NOTE AMICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION WHEN REMOVING THE WIRE LEADS FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NOT THE WIRES 5 TEST PROCEDURE RESULTS CIRCULATION MOTOR Measure the resistance Normal 165 ohm Wire leads removed Multi meter scale R x 1 Abnormal Infinite or several ohm KEY PCB Check continuity between switch terminals by pressing an appropriate pad on key board The contacts assignment of the respective pads on the key board is as shown left figures NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE CORRECT POSITION WHEN REMOVING THE WIRE LEAD FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NOT THE WIRES 5 13 TROUBLE SHOOTING WHEN YOU COMPLAINT FROM YOUR CUSTOMER EVALUATE THE COMPLAINT CAREFULLY IF THE FOLLOWING SYMPTOMS APPLY PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE OVEN THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL CAUTIONS 2 3 4 damage this control panel 1 Check g
9. DY Output is full when Disconnect the Defective Replace P C B you set lower wire leads from assembly assembly power level relay 4 and check continuity relay 4 Operate the unit TROUBLE 7 Heater Relay 5 Up sheath Heater Relay 6 Lo sheath Heater Relay 7 Halogen Ceramic Heater CONDITION CHECK RESULT CAUSE REMEDY 1 Heater is not Malfunction of the operating Heater Abnormal heater Replace Normal Thermostat and Malfunction of the relay 5 6 7 Abrama thermostat and Be relay 5 6 7 Normal 1 Replace Wire connection No continuity Open or loosen connect tightly 2 Lower tempera Malfunction of the ture the oven Heater Abnormal heater Replace Normal Thermostat and Abnormal Malfunction of the Replace relay 5 6 7 NOTE Make sure the wire leads correct position When removing the wire leads from parts Be sure to grasp the connector not the wires When removing the magnetron be sure to install the magnetron gasket in the correct position and in good condition 5 19 thermostat and relay 5 6 7 EV EXPLODED VIEW INTRODUCTION MODEL 9482 INTERIOR PARTS OVEN CAVITY PARTS BASE PLATE PARTS CONTROL PANEL PARTS LATCH BOARD PARTS DOOR PARTS 6 1 5
10. GUENCE The following is a description of component functions during oven operation 1 SETTING THE CLOCK Turn Dial Stop Clear Clock gt Desired hour Turn Dial gt Desired gt Start minute 2 MCROWAVE COOKING Stop Clear Function MWO Turn Dial Desired power level Enter 3 MULTI STAGE COOKING MICROWAVE Turn Dial Desired cooking time Start Stage 1 Turn Dial Turn Dial Stop Function He Desired t Enter Desired gt power level cooking time Stage 2 Function Desired Desired MWO power Enter cooking H Start level time 4 GRILL COOKING Stop Function Turn Dial Clear gt Enter Turn Dial Desired Start cooking time Grill Categories Grill 1 Halogen Ceramic Sheather Upper Heater Grill 2 Upper Sheath Heater Grill 3 Lower Sheath Heater 5 CONVECTION COOKING To cook Stop Funct Turn Dial een Convection Enter Desired convection temp 40 C 100 250 Enter Desired cooking time Start 6 SPEED COMBI COOKING
11. IAGRAM NO3L3NOVN NOlLdO N311I4 lt Im 70 x 02 H 4 M 30010 A H 11319133399 SAILISOd 942 YOLOW 30111098139 WO HOLIMS MS YOLOW 318 1 3dlMIS MOTISA ANY 3339 459 3 dWV1 NJAO TO MOLON NV4J Wj 3LIHM HM Q33 QM 107734 7 NMOYE NG oOov1H g8 3n 8 18 N3dO SI 4000 310N sissDuo 0 10901141157 4 319090095 eAnpbbeu ay Bunaous 403120955 ubiu eui absoyosiq 21101 835 330438 39VL1OA 1 30 31195 V1 N39svHO3Q 13 M3193NNOO3Q SNDINHOAL NOILN3AM3LNI LNVAV ii uepohue esso 940 4 Jon JoiosuepuoxsBunuuodsuooH NN HOV JO1siuueu E SAM VAM CNO HM 100 102 1000 1009 TV WH3HL NJAO NO3L3NOVW 18 m Ceramic 1 591 NH Sheath Halogen J9U410JSUDJ Lo Sheath Monitor SW ya MS AOL INES J3MOd LNdNI 4 3 CIRCUIT DESCRIPTION GENERAL DETAILS The low voltage transformer supplies the necessary voltage to the micom controller when power cord is plu
12. Normal Infinite Filament winding to ground Normal Infinite MAGNETRON Wire leads removed Measure the resistance Ohm meter scale Rx1 Normal Less than 1 ohm Filament terminal Measure the resistance Ohm meter scale Rx1000 Normal Infinite Filament to chassis COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket 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 CAPACITOR Measure the resistance Ohm meter scale Rx1000 Terminal to terminal Normal Momentarily indicates several ohms and then gradually returns to infinite Measure the resistance Ohm meter scale Rx1000 Terminal to case Normal Infinite HIGH VOLTAGE DIODE NOTE Some inexpensive meters may indicate infinite resistance in both direction Measure the continuity Forward Ohm meter scale Rx10000 Normal Continuity Abnormal Infinite Measure the continuity Reverse Ohm meter scale Rx10000 Zoe Normal Infinite Abnormal Continuity COMPONENTS TEST PROCEDURE RESULTS FUSE Check for continuity of the fuse with an Normal Abnormal H V FUSE multi meter e J NOTE If the fuse is blown check the primary the secondary and the monitor switches H V D and H V C before
13. The initial and final water temperatures are selected so that the maximum difference between the final water temperature and the ambient temperature is 5 K The microwave power output P in watts is calculated from the following formula 4187 X AT 0 55 X T To X M T Tz Temperature after heating To Temperature of bowl M Weight of bowl is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included The water is stirred to equalize temperature throughout the vessel prior to measuring the final water temperature e Stirring devices and measuring instruments are selected in order to minimize addition or removal of heat WATER LOAD TURNTABLE DISASSEMBLY AND ADJUSTMENT A OUTER CASE REMOVAL 1 Disconnect the power supply cord from the outlet 2 Remove the screws from the rear and along side edges of the case The outer case must be moved backward to be lifted off B POWER SUPPLY CORD 1 Remove the outer case 2 Disconnect two terminals and remove one screw of the earth terminal CAUTION DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING refer to page 2 1 5 3 C CONTROL PANEL ASSEMBLY 1 Disconnect the leadwire from the PCB SUB ASS Y 2 Remove the screws for the control bracket and securing the control panel 3 Remove control panel ASS Y from the oven by the moving control panel ASS Y right s
14. Website http biz Igservice com LG LIGHT OVEN SolarDOM MODEL 9482 CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL July 2002 P NO 3828W5S2190 Printed in Korea 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 A Do not operate or allow the oven to be operated with the door open B Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary 1 interlock operation 2 proper door closing 3 seal and sealing surfaces arcing wear and other damage 4 damage to or loosening of hinges and latches b evidence of dropping or abuse C Before turning on microwave power for any service test or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections D Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this m
15. anual before the oven is released to the owner E A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner CAUTION MICROWAVE RADIATION DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERCY CONTENTS Page SAFETY PRECAUTIONS Inside front cover SPECIFICATIONS 11 mm saanss 1 1 2 1 INSTALLATIONS 3 1 OPERATING INSTRUCTIONS aaa 4 1 FEATURES mem ns 4 1 CONTROL PANEL es nn mes ne a season ne ae het 4 1 OPERATING SEQUENCE m eem enne 4 2 4 3 CIRCUIT DESCRIPTION 5 528865 tee 4 4 SERVICE INFORMATION 5 1 TOOLS AND MEASURING INSTRUMENTS m mee e mee 5 1 MICROWAVE LEAKAGE TEST 5 1 MEASUREMENT OF MICROWAVE POWER OUTPUT III ee 5 3 DISASSEMBLY AND m mee emen 5 3 UPPER amp LOWER HEATER 5 7 681091600 40171655558 5 8 COMPONENT TEST PROCEDURE im
16. ba 5 9 TROUBLE SHOOTING 5 14 EXPLODED VIEW 6 1 REPLACEMENT PARTS LIST nk 7 1 SCHEMATIC DIAGRAM OF P C Bi 8 1 PRINTED CIRCUIT BOARD 8 2 PCB PARTS LIGT an iaaii irine naois 5 pesi os toes Lost peso coii desi Cosi peso 9 1 SPECIFICATIONS MODEL 9482 Power Reguirement 230 Volts AC 50 Hz Single phase 3 wire grounded Microwave 1 650W Grill 2 100W Combination 2 800W Convection 1 900W Power Output 900 Watts full microwave power 60705 Microwave Freguency 2 450 MHz Magnetron 2M214 240GP Timer 0 90 min Outside Dimensions 527 W x 392 x 480 D mm Cavity Dimensions 440 W x 204 H x 420 D mm Net Weight 28 kg Shipping weight 31 kg Control Complement Microwave Power level 3 Convection 40 100 250 MAX 900W 600W 360W 180W 90W 4 SPEED COMBI 2 GRILL Display Heater Microwave power selection Category Display Heater operating Co 1 Grill 1 180W 360W 600W Grill 1 9 1 Upper heater 2000W Co 2 Grill 2 180W 360W 600W Grill 2 gr 2 Upper heater 1100W Co 3 Grill 3 180W 360W 600W Grill 3 gr 3 Lower heater 700W Co 4 Upper Lower 0W 180W 360W 600W Co 5 Convection 180W 360W 600W 5 SPEED AUTO COOK SC1 g F
17. ce may not correspond with the colored markings identifying the terminals in your plug proceed as follows The wire which is colored green and yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol or colored green or green and yellow The wire which is colored blue must be connected to the terminal in the plug which is marked with the letter N or colored black The wire which is colored brown must be connected to the terminal in the plug which is marked with the letter L or colored red OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Frame HIGH Rack LOW Rack Choke Cover Safety Door Lock System Metal Tray CONTROL PANEL 199 4 769 0S 20 5 sca 1 6 oes oo c e 37 295 Speed Speed Micro Grill Conv Combi Auto Cook Enter Defrost Favorite Clock Stop Clear I Quick Start 3 4 10 11 12 13 14 Display Window You can show time of day cooking time power level and cooking categories Enter You can determine the selected cooking category microwave power level or temperature Micro You can select five power level settings Grill You can select the grill categories Conv You can select temperature and time of convection Speed Combi You can select the combination categories Spee
18. d Auto Cook Speed auto cook allows you to cook mostof your favorite food guickly by selecting the food type and the weight of the food RU 8 Dial Knob You can set cooking times temperature weight and cooking categories While cooking with auto and manual function you can lengthen or shorten the cooking time at any point by turning the dial knob except defrost mode 9 Defrost You can select the food type and the weight of the food 4 1 10 Favorite The cooking program can be stored in the memory of your oven up to 9 modes FA 1 FA 9 11 12 Clock You can set the time of day of day Press Stop Clear Button one time on window in time of day or clear Press Stop Clear Button one more disappeared 13 Start Quick Start Stop Clear You can stop over and clear all entries excepttime all icons will be displayed mode time all icons will be n order to start cooking which is selected press button one time The quick start feature allows you HIGH power cooking with a touch 14 Icon You can see all icons by pressi to set 30 seconds intervals of of the quick start button ng Stop Clear button one time and remove all icons by pressing one more time all icons will disappear automatically after 15 seconds Blink will guide to next step for setting while cooking the icon of the selected cooking mode will be di splayed on window OPERATING SE
19. ding the H V transformer and remove the high voltage diode earth screw H V Transformer 7 H V Fuse Fan Motoer Assembly 4 REMOVING THE TURNTABLE MOTOR 1 Remove the metal tray 2 Remove the turntable shaft VERY CAREFULLY 3 Lay the unit down on its back 4 Remove the turntable motor cover The turntable base cover is easily removed by pinching the six parts with a wire cutting 5 Disconnect the leadwire from the turntable motor terminals 6 Remove the screw securing the turntable motor to the oven cavity Ass y 7 After repairing the motor rotate the removed turntable motor cover 8 Fit the turntable motor cover s projecting part to the base plate slit and fasten a screw NOTE 1 Remove the wire lead from the turntable motor VERY CAREFULLY 2 Be sure to grasp the connector not the wires when removing 31 5 Turntable Motor C MOTOR THERMISTOR REMOVAL 1 Remove air guide and controller assembly upper 2 Disconnect the leadwire from the circulation motor terminal and oven thermostat 3 Remove the screws of the thermistor guide assy chamber and lift up the guide assy chamber 4 Remove a hex nut securing the circulation fan to shaft of the C motor 5 Remove screws securing the motor shaft to the guide assy chamber 6 Remove hex nut securing the C motor to the motor shaft Circula
20. e switches with an audible click If the latches do not activate the switches when the door is closed the switches should be a adjusted in accordance with the adjustment procedure Disconnect the wire lead from the primary switch Connect the ohmmeter leads to the common COM and normally open NO terminal of the switch The meter should indicate an open circuit in the door open condition When the door is closed the meter should indicate a closed circuit When the primary switch operation is abnormal make the necessary adjustment or replace the Switch only with the same type of switch B SECONDARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary Switch Connect the ohmmeter leads to the common COM and normally open NO terminals of the Switch The meter should indicate a open circuit in the door open condition When the door is closed meter should indicate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the Switch The meter should indicate closed circuit in the door open condition When the door is closed meter should indicate an open circuit When the monitor switch operation is abnormal replace with the same type of switch NOTE After r
21. epairing the door or the interlock System it is necessary to do this continuity test before operating the oven COMPONENTS TEST PROCEDURE RESULTS SWITCHES Check for continuity of the switch Door Door Wire leads removed with a Multi meter open close C Primary 9 ZTN Switch 7 222 2221 NC a Monitor ET gt 2 2 Switch Ee 2 2 c Secondary Switch 243 a NOTE After checking for the continuity of switches make sure that are correctly connected 5 8 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 SEE PAGE 2 1 2 ALL OPERATIONAL WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD 1 LITER OF WATER IN CONTAINER IN THE OVEN COMPONENTS TEST PROCEDURE RESULTS HIGH VOLTAGE TRANSFORMER Wire leads removed FILAMENT WINDING TERMINAL SECONDARY TERMINAL YAS PRIMARY TERMINAL 1 Measure the resistance Ohm meter scale 1 and Rx100 Primary winding Approx 1 66 ohm Secondary winding Approx 99 5 ohm Filament winding Less than 1 ohm Measure the resistance Ohm meter scale Rx1000 Primary winding to ground
22. f gold or silver powder is used cookware with metallic trimming Uneven cooking gt Inconsistent intensity of 1 Wrap the thinner part with microwave by their characteristics 5 14 aluminum foil 2 Use plastic wrap or lid 3 Stir once or twice while cooking soup cocoa or milk etc TROUBLE 1 The following visual conditions indicate probable defective control circuit 1 Incomplete segments Segment missing Partial segment missing Digit flickering NOTE Slight flickering is normal WP Colon does not turn on or blink A distinct change in the brightness of one or more numbers in display One or more digits in the display are not lighting Display does not count down with time blinking or up with clock operation Display obviously jumps in time while counting down Display counts down too fast while cooking Each indicator light does not turn on after setting cooking cycle Display time of day does not reappear when cooking is finished Beep sound is not heard when correct key is touched CONDITION CHECK RESULT CAUSE REMEDY 1 No input can be Check the conn Continuity Defective PCB Replace PCB programmed ection between assembly assembly key as
23. gged in When the door is closed the primary switch is ON the secondary switch is ON and the monitor switch opens contact COM and NO WHEN SELECTING COOKING POWER LEVEL AND TIME The micom controller memorizes the function you set The time you set appears in the display window Each indicator light turns on to indicate that the stage has been set WHEN TOUCHING THE START BUTTON The coil of the relay is energized by the micom controller Power input is supplied to the high voltage transformer through the fuse to the primary switch and relay 4 Turntable rotates PRIMARY FUSE SWITCH 4 O O 1 MONITOR TRANS SWITCH FORMER ERA SECONDARY 2 SWITCH MICOMCONTROLLER 00 The fan motor rotates and cools the magnetron blowing the air coming from the intake on the back cover The air is also directed into the oven to exhaust the vapor in the oven through the upper plate Cooking time starts counting down 3 2 volts AC is generated from the filament winding of the high voltage transformer This 3 2 volts is applied to the magnetron to heat the magnetron filament through two noise preventing choke coils A high voltage of approximately 2100 volts AC is generated in the secondary of the high voltage transformer which is increased by the action of the high voltage diode and charging of the high voltage capacitor The negative
24. gy leakage before the outer case is installed and after all necessary components are replaced or adjusted Special care should be taken in measuring the following parts Circled area of below Fig Around the magnetron The waveguide WARNING AVOID CONTACTING ANY HIGH VOLTAGE PARTS MEASUREMENT WITH A FULLY ASSEMBLED OVEN After all components including the outer case are fully assembled measure for microwave energy leakage around the door viewing window the exhaust opening and air inlet openings Microwave energy leakage must not exceed the values prescribed below NOTE Leakage with the outer case removed less than 5 mW cm sq Leakage for a fully assembled oven Before the latch switch primary is interrupted with the door in a slightly opened position less than 2 mW cm sq 5 2 NOTES WHEN MEASURING Do not exceed meter full scale deflection The test probe must be removed no faster than 1 inch sec 2 5 cm sec along the shaded area otherwise a false reading may result The test probe must be held with the grip portion of the handle A false reading may result if the operator s hand is between the handle and the probe When testing near a corner of the door keep the probe perpendicular to the surface making sure the probe horizontally along the oven surface this may possibly cause probe damage RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT After adju
25. he sheath heater upper Remove the base plate from cavity Remove the Gasket Ring and Heater Bracket Remove the sheath heater in the oven cavity and main wire connector 3 Remove the screws of the chamber U 4 Remove the chamber U air tunnel U 5 Remove the screw securing of the reflector to sheath heater 6 Remove the sheath heater from reflector 7 Remove the screw securing of the heater support F to reflector 8 Remove the heater support F B of reflector 9 Disconnect the leadwire from ceramic heater 10 Remove the ceramic heater and halogen heater 2 2 Disconnect the leadwire from the sheath heater 3 Remove the nuts from the oven cavity of the side 4 5 Chamber U Air Tunnel U Upper Sheath Heater Support B Ceramic Heater Halogen 5 7 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 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 th
26. ide D DOOR GROSS ASSEMBLY REMOVAL 1 Disconnect power 2 Open the door from oven insert into the choke cover hole of door 3 Lift the door from front cavity NOTE 1 After replacing the door be sure to check that the primary switch monitor switch and secondary switch operate normally After replacing the door check for microwave energy leakage with a survey meter Microwave energy must be below the limit of 5 mW cm with a 275 ml water load When mounting the door assembly to the oven assembly be sure to adjust the door assembly parallel to the chassis Also adjust so the door has no play between the inner door surface and oven frame assembly If the door assembly is not mounted properly microwaves may leak from the clearance between the door and the oven E HIGH VOLTAGE TRANSFORMER REMOVAL Refer to page 5 5 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from magnetron choke filter high voltage transformer and capacitor 3 Remove the screw holding the high voltage transformer to the Insulator U F AIR GUIDE ASSEMBLY REMOVAL 1 Remove the screw on the Bracket upper and lift out the Bracket upper 2 Remove the mounting screw from magnetron upper chamber and front plate G MAGNETRON REMOVAL 1 Remove controller assembly Bracket upper and air guide from upper 2 Disconnect the leadwi
27. n the magnetron NEVER put anything into the latch hole and the interlock switches area 2 1 MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating device if it is improperly used or connection All input and output microwave connections waveguide flange and gasket must be secure never operate the device without a microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized Proper operation of the microwave oven requires that the magnetron be assembled to the waveguide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron ANTENNA Gasket COOLING FIN MAGNETRON CHASSIS GROUND MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL INSTALLATIONS BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY INSTALLING 1 Empty the oven and clean inside it with a soft damp cloth Check for damage such as misaligned door damage around the door or dents inside the cavity on the 2 Put the oven a counter table or shelf that is strong enough to hold the oven and the food and utensils you put in it Use care when handling
28. o the high ie age transformer age transformer voltage capacitor and operate the unit NOTE All these switches must be replaced at the same time Refer to page 5 6 5 8 2 Fuse does not blow Defective mag netron thermostat oven thermostat and Lower voltage transformer Replace mag netron thermostat oven thermostat and Lower voltage transformer of power supply cord Check continuity No continuity of magnetron thermostat Continuity _y Check continuity y No continuity 5 16 Defective power supply cord gt Replace power supply cord TROUBLE 3 Display shows all figures set but oven does not start cooking while desired program times are set and START button is touched CONDITION CHECK RESULT CAUSE REMEDY 1 Setting time 00891 Check continuity No continuity t down of secondary secondary switch secondary switch when touching switch with and secondary and secondary START button door closed E Switch wire Switch wire 14 connector connector I Check the con necti
29. on between at Defective P C B Replace P C B 7 gt connector and assembly assembly gt P C B assembly Continuity 7 Loose connection Den 2 Fan motor Check fan motor Defective fan Re place fan c motoror 11 motor ra Abnormal motor c motor motor c motor oven lamp turntable Check oven lamp Defective fan Replace fan motor do not turntable motor 94 motor c motor motor c motor turn on Normal TROUBLE 4 Oven seems to be operation but little heat is produced in oven load CONDITION CHECK RESULT CAUSE REMEDY Output is low Check the Lower than 90 of Decrease in power _ Suggest customer power source rating voltage source voltage contact local voltage with load electric power ss NGG utility co or gualified electrician Disconnect the wire leads from Defective Re place gt relay4 check gt assembly assembly on and off time with multitester Normal Measure the Abnormal Defective Replace output power magnetron magnetron NOTE Simple test of power output conducted by heating one liter water for one min if available Minimum 8 5 temperature rise is normal condition 5 17 TROUBLE 5 No micro
30. re from the high voltage amp choke filter transformer and Magnetron 3 Carefully remove the mounting screws holding the magnetron and the wave guide 4 Remove the magnetron until its dome is clear from the wave guide NOTE 1 When removing the magnetron make sure its dome does not hit any adjacent parts or it may be damaged 2 When replacing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition 3 After replacing the magnetron check for microwave leakage with a survey meter around the magnetron Microwave energy must be below the limit of 5 mW cm With a 275 ml water load Make sure that gasket is rigidly attached to the magnetron To prevent microwave leakage tighten the mounting screws properly making sure there is no gap between the waveguide and the magnetron Bracket MOTOR ASSEMBLY REMOVAL 1 Remove controller assembly air guide power cord latch board R from upper 2 Disconnect the leadwire from fan motor latch board R and Noise filter 3 Remove the three screws holding the the upper plate to the oven cavity 4 Remove the fan motor ASS Y to the upper plate 1 HIGH VOLTAGE CAPACITOR H V FUSE TRANSFORMER AND DIODE REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from H V transformer MGT H V Fuse and H V capacitor 3 Remove the screw hol
31. rounding before checking for trouble Be careful of the high voltage circuit Discharge the high voltage capacitor See page 2 1 When checking the continuity of the switches or of the high voltage transformer disconnect one lead wire from these parts and then check continuity with the AC plug removed To do otherwise may result in a false reading or damage to your meter 5 Do not touch any part of the circuitry on the digital programmer circuit since static electric discharge may Always touch yourself ground while working on this panel to discharge any static charge built up in your body CONDITION CAUSE REMEDY The oven gt Inserting many plug into one gt Avoid using other electrical does not work plug outlet and using appliances when you use them at the same time the oven causes overloading oven inserted Insert the oven plug securely Output power is too low gt Low AC input voltage gt Use the oven at adequate line voltage Food temperature is too low gt This may not be a defect It is possible that the food should be cooked for a longer time period Sparks occurring Using metallic ware and Do not use metallic ware for allowing it to touch the oven cooking except where noted wall in the cooking guide Lit Ceramic ware trimmed in 2 4 Do not use any type o
32. rozen Pizza SC5 SC2 W French Fires SC6 SC3 lt 7 Whole Chicken SC7 SCH GS Beef Steaks SC9 s Frozen Dinners Roast Pork SC10 P Fresh Vegetables 6D Roast Beef SC11 5 Vegetables N Chicken Pieces 508 5 Potatoes SC12 eyf Rice Pasta 7 amp Nameplate Location Front Plate 1 Accessories Owner s manual 8 Cook book High rack Low rack Metal tray This oven is designed for household use only Itis not recommended for commercial purposes CAUTIONS Unlike other appliances the microwave oven is high voltage and high current eguipment Though it is free from danger in ordinary use extreme care should be taken during repair DO NOT operate on a 2 wire extension cord during repair and use NEVER TOUCH any oven components or wiring during operation BEFORE TOUCHING any parts of the oven always remove the power plug from the outlet For about 30 seconds after the oven stops an electric charge remains in the high voltage capacitor When replacing or checking you must discharge the high voltage capacitor by shorting across the two terminals with an insulated screwdriver D CQ 4 Remove your watches whenever working close to or replacing the Magnetron NEVER operate the oven with no load NEVER injure the door seal and front plate of the oven cavity NEVER put iron tools o
33. sembly and PCB No continuity Loose Connect them assembly connection tightly 2 Some inputs Everything works a E Replace cannot be Replace key as specified efective key eplace key assembly and assembly assembly programmed i check operation 3 Display shows a Still have trouble Defective PCB Replace PCB number or figure assembly assembly different from one touched 4 Random programming when touching other pads 5 Display is fiked at some figure and can not accept any input 5 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 1 Fuse blows gt Check continuity c ontinuity Malfunction of the Replace primary of monitor i monitor switch and monitor switch with switches door closed gt No continuity Replace fuse Check continuity Continuity Shorted contact at gt Replace primary of primary the primary switch and monitor switch with i switches door opened gt No continuity Disconnect one Defective high Replace high side the wire voltage capacitor voltage capacitor gt lead connected from transformer Defective high volt Replace high volt t
34. stment and repair of any microwave energy interruption or microwave energy blocking device record the measured values for future reference Also enter the information on the service invoice The microwave energy leakage should not be more than 4 mW cm sq after determining that all parts are in good condition functioning properly and genuine replacement parts which are listed in this manual have been used At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer MEASUREMENT OF MICROWAVE POWER OUTPUT Microwave power output measurement is made with the oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of 1000 5 g potable water The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm The oven and the empty vessel are at ambient temperature prior to the start of the test The initial temperature 1 of the water is 10 2 It is measured immediately before the water is added to the vessel After addition of the water to the vessel the load is immediately placed on the center of the shelf which is in the lowest position and the microwave power switched on The time T for the temperature of the water to rise by a value AT of 10 2 K is measured where T is the time in seconds and AT is the temperature rise
35. the microwave radiation leakage emitted by the oven should not exceed 4 mW cm Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage 5 1 NECESSARY MEASURING INSTRUMENTS TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday HI 1500 HI 1501 Narda 8100 8200 nch scale 600 cc non conductive material beaker glass or plastic inside diameter approx 8 5 31 2 in Oylindrical and made of borosilicate glass vessel max thickness 3 mm outside diameter approx 190mm height approx 90mm Glass thermometer 100 C or 212 F 1 deg scale MEASURING MICROWAVE ENERGY LEAKAGE Pour 275 15cc of 20 5 68 9 F water a beaker which is graduated to 600 cc and place the beaker on the center of the turntable Set the energy leakage monitor to 2 450 MHz and use it following the manufacturer s recommended test procedure to assure correct result When measuring the leakage always use the 2 inch 5017 spacer supplied with the probe Operate the oven at its maximum output Measure the microwave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface being measured Move probe along shaded area scanning speed Less than 2 5 cm sec 1in sec MEASUREMENT WITH OUTER CASE REMOVED When you replace the magnetron measure for microwave ener
36. tion Motor Oven Thermostat Thermistor N gt Ta Sub Main PCB Sub Tact S W Control Panel Indicate Deco M INTERLOCK SYSTEM 1 INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage 2 MOUNTING OF THE PRIMARY MONITOR SECONDARY SWITCHES TO THE LATCH BOARD L PCB ASSEMBLY REMOVAL 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 ASS Y to the PCB holder 3 Remove the PCB holder amp PCB Bracket 4 Remove screws which hold the control panel 5 Disconnect the flat cable from the PCB SUB ASS Y and take off the PCB SUB ASS Y 5 6 ADJUSTMENT DIRECTION MONITOR SWITCH PRIMARY SWITCH SECONDARY SWITCH 3 INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY Mount the latch board to the oven assembly Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed Tighten the mounting screw UPPER HEATER REMOVAL LOWER HEATER REMOVAL 1 Remove the screw securing the air guide to the 1 Disconnect the leadwire from t
37. wave even though oven lamp and fan motor run Display operates properly CONDITION No microwave oscillation CHECK RESULT CAUSE REMEDY Disconnect the 27 Defective P C B Replace P C B continuity gt wire leads from assembly assembly relay 4 and check continuity wae of relay 4 Continuity Operate the unit ive hi Replace high 2 ransformer an H V Fuse transformer and transformer and H V Fuse Fuse normal Check H V Defective high Replace high capacitor voltage capacitor voltage capacitor normal Check H V Defective high Replace high diode Abnormal voltage Diode voltage Diode normal Check Anemia Defective Replace Magnetron 4 magnetron magnetron 5 18 TROUBLE 6 Oven does not cook properly when programmed for the set power level Operates properly on HIGH CONDITION CHECK RESULT CAUSE REME
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