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Service Manual - Appliance Factory Parts

1. 12 13 9 Disassembly IMStructlONS 14 18 10 Interl0ck Continulty Test 19 11 Test and Checkout Procedures and Troubleshooting A Test Procedures TR 20 22 B Checkout Procedures c dice te e a E ERU ai E 23 25 C Troubleshootirige oo octo n c t t e tin cmt la t tiri in 26 30 12 Exploded Vi6w 4 aee dne ee eek Lo eec e eek e de Peu eR og e e dee 31 37 13 Replacement Parts u ihe rete date P pee e petens 38 41 14 Schematic diagram of P C B iai er tr _ _ 42 A Printed circ rt board riale abate at te tette om ae et 43 1537 G B Parts 662 25 en dio 44 46 1 ADJUSTMENT PROCEDURES To avoid possible exposure to microwave energy leakage adjust the door latches and interlock switches using the following procedure ONLY AUTHORIZED SERVICE PERSONNEL SHOULD MAKE THIS ADJUSTMENT The Interlock Monitor and Primary Interlock Switch acts as the final safety switch protecting the user from microwave energy The terminals between and NC of the Interlock Monitor must close when the door is opened After adjusting the Interlock Monitor Switch make sure that it is correctly connected See Figures 1 a and 1 b throughout this procedure CHECK
2. cord gt Check continuity No continuity gt Defective L Replace of thermostat thermostat thermostat Continuity gt Check continuity No continuity Defective power Replace power of power supply supply cord supply cord 28 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 1 Setting time Check continuity No continuity 22 e dura i does not count of secondary secondary switch secondary switch down when switch with touching START door closed L Continuity pad Check the con T Defective Power Replace Power nection between Continuity PCB assembly PCB assembly CN1 connector and PCB No continuity Loose connection gt 080060 Mem assembly tightly 2 Fan motor or Check fan motor gt Abnormal Defective fan motor 3 Replace fan motor oven lamp do not turn Check oven lamp x Abnormal Defective oven lamp Replace oven lamp Normal TROUBLE 4 Oven seems to be operating but little heat is produced in oven load COND
3. ASS Y J att RD RD X 9 e c FUSE BK 20 E701 I I CN 1 INVERTER 702 wl l ES d x ELE FAN p TABLE MONITOR MOTOR MOTOR SWITCH CN701 INPUT ve AC WH YL 120V 60Hz I SECONDARY INTERLOCK GN PK SWITCH T NOTE DOOR IS OPEN BK BLACK 56 57 9 so BE WH WHITE CN3 2oLBN BN BROWN RY2 o MH 1 BL BLUE RD RED To Bk YL YELLOW pol RD SENSOR PINK WH ASS Y GN GREEN MICOM CONTROLLER So Figure 3 MATRIX CIRCUIT FOR TOUCH KEY BOARD aj dj 13 dal 6 CHICKEN KITCHEN EZ ON CHOICES N C TIMER CLOCK MORE LESS 8 VEGE AUTO ast REHEAT POTATO EE N C RICE POPCORN JAS MM uA ID CHILDREN S FROZEN D LUNCH ENTREE 5 MELT 101 11 COOK STOP Power TIME CLEAR START 12 i Figure 4 IN 7 OPERATING PROCEDURES A CONTROL PANEL 9 o O SENSOR TOUCH DEFROST POPCORN POTATO RICE CHICKEN corren AUTO I cook 0 41 21 3 415 2195 5 s START PEREAT E Ere LUNCH MELT Ll H power ICE 67189 O smarfWQVe 0 Figure 5 Display The Display includes a clock and indicators that tell you time of day
4. Pe 1 x LX 3 CLOCK MORE LESS 7 be I sa gt POTATO no RICE Forconi TT 1 w moja I A A 2 0 IEMADE FAST MAGNETRON 2 SOFTEN MELT y Perros want panas 1 12 2 2 85 5 3 HH El 1 3 4 5 6 7 INVERTER I 4 Pre ft A AAA A 120 V w il START 8 9 0 H 3 V w wl 30 pots ea _ LI 22 AA lt 3 42 PRINTED CIRCUIT BOARD KEY PCB gt h deii MAIN 6870W1A145A ur 4 3j o o Bl f vo o o o PANO o DESIGNED BY Y J PARK O 2002 06 23 1 6871W14145
5. Abnormal Infinite or several Sensor cooking condition 1 Oven should be plugged in at least 5 minutes before sensor cooking 2 Room temperature should not exceed 95 F 3 Be sure the exterior of the cooking container and the interior of the oven are dry 4 The oven will not generate microwave energy for the first 28 seconds of the sensor cooking cycle 21 COMPONENTS TEST PROCEDURE RESULTS RELAY Check for continuity of relay with an Normal Approx ohm meter ON 0 ohm Remove lead wires from relay and OFF e ohms operate the unit Abnormal Infinite or several ohms FAN MOTOR Measure the resistance Normal Approx 50 150 ohms Wire leads removed Ohm meter scale R x 100 Abnormal Infinite or several ohms TURNTABLE MOTOR Wire leads removed Measure the resistance Ohm meter scale R x 1000 8 Normal Approx 2 4K ohms Abnormal Infinite or several ohms NOTE AMICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT 1 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 22 CHECKOUT PROCEDURES 1 CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION REPLACE BLOWN FUSE WITH 20 AMPERE FUSE PROBLEMS CAUSES Fuse blows immediately after the door is closed Improper operation of the primary
6. Do not touch any part of the circuit on the PCB since static electric discharge may damage this control panel Always touch yourself to ground while working on this panel to discharge any static charge built up in your body Micom model only CONDITION Microwave oven CAUSE does not work Inserting many plugs into one outlet and using them at the same time blown fuse or breaker REMEDY Avoid using other electrical appliances when you use the microwave oven Microwave oven plug is not inserted tightly Insert microwave oven plug securely Output power is too low Low AC input voltage Use the microwave oven at adequate line voltage Food temperature is too low This may not be a defect It is possible that the food should be cooked for a longer time period Sparks occur Uneven cooking Using metallic ware and allowing it to touch the oven wall Do not use metallic ware for cooking except where noted in the cooking guide Ceramic ware trimmed in gold or silver powder is used Do not use any type of cookware with metallic trimming Inconsistent intensity of microwave by their characteristics 26 1 Use plastic wrap or lid 2 Stir once or twice while cooking
7. conimuny connection tightly 2 Some inputs Replace key Everything works Defective key Replace key cannot be membrane as specified membrane membrane programmed assembly and assembly assembly check operation 3 Display shows a Still have trouble Defective PCB Replace PCB number or figure assembly assembly different from one touched 4 Random TROUBLE 2 Oven does not operate at all Display window does not display any figures and no input is accepted door opened No continuity RELAY of P C B Assembly CONDITION CHECK RESULT CAUSE REMEDY Check co ntinuity LIN Malfunction of the Replace fuse of monitor ELE monitor switch primary monitor switch with switches and door closed e RELAY of P C B gt No continuity Assembly Replace fuse so continuity Continuity Shorted contact at gt Replace jos of primary primary monitor switch with P y switches and gt Disconnect one side of the lead wires connected from Inverter Normal Defective control PCB m Replace Inverter Fuse blows again Defective Inverter gt Replace control PCB NOTE All these switches must be replaced at the same time Refer to page 18 19 2 Fuse does not blow
8. cooking time settings and cooking functions selected Sensor Touch This pad allows you to cook most of your favorite foods without having to select cooking times and power levels Homemade Bakery Homemade bakery has 3 food categories of preset cooking time and power level Chicken Choices Chicken Choices has 4 food categories of preset cooking time and power level Soften Touch this pad to soften ice cream cream cheese butter or frozen juice Children s Lunch Children s Lunch has 3 food categories of preset cooking time and power level Fast Breakfast Fast Breakfast has 3 food categories of preset cooking time and power level Melt Touch this pad to melt chocolate cheese butter or marshmallows Auto Defrost This pad is an accurate defrosting method for meat poultry fish and bread 10 11 12 13 14 15 16 17 18 19 Q Defrost Touch this pad to defrost foods quickly More Less Touch these pads to adjust cooking time in 10 second increments Cook time Touch this pad to set a cooking time Power Touch this pad to set a cooking power Clock Touch this pad to enter the time of day Kitchen Timer Touch this pad to use your microwave oven as a kitchen timer Number pads Touch Number pads to enter cooking time Power level quantities or weights Stop Clear Touch this pad to stop the oven or clear entries Also used to turn Child Lock on and off Ez ON You can exte
9. used recently 1 Fill the test beaker with 59 F 15 C 75 F 24 C 1 liter tap water 2 Stir the water in the beaker with thermometer F or and measure temperature as T1 3 Place the beaker on the center of turntable 4 Set for one 1 minute b When the heating is finished stir the water again with thermometer and measure the temperature of water as T2 6 Subtract T1 from T2 this will give you the temperature rise 7 The microwave power output is within specification if the temperature rise is as shown below Voltage Temperature Rise VAC under load C F 120V 13 15 23 4 27 108V 11 5 13 5 20 7 24 3 8 Power output will be influenced by line voltage of power supply Consequently correct power output must be measured within 120V AC 1 Volt while unit is operating SPECIAL TIP This oven used the button head screws Button Head Torx style 2 When you remove the screws using the tamper resistant Torx driver have a pin in head 9 DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES UNIT MUST BE DISCONNECTED FROM ELECTRICAL OUTLET WHEN MAKING REPAIRS RE PLACEMENTS ADJUSTMENTS AND CONTINUITY CHECKS WAIT AT LEAST ONE MINUTE UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE I E TEST PROBE CONNECTED TO 10K OHM RESIS
10. ARNING FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS TYPE NO SZM V 16 FA 63 OR VP 533A OF OR V 5230Q FOR PRIMARY SWITCH TYPE NO SZM V 16 FA 62 OR VP 532A OF OR V 5220Q FOR MONITOR SWITCH TYPE NO SZM V 16 FA 63 OR VP 533A OF OR V 5230Q 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 the 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 COMPONENTS TEST PROCEDURE 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
11. E 1 Pour 275 15cc of 20 5 C water in beaker which is graduated to 600 cc and place the beaker in the center of the oven 2 Set the energy leakage monitor to 2 450 MHz and use it following the manufacturer s recommended test procedure to assure correct result 3 When measuring the leakage always use the 2 inch 5 cm spacer supplied with the probe 4 Operate the oven at its maximum output 5 Measure the microwave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface being measured See Figure 7 Move probe along shaded area Probe scanning speed less than 2 5 cm sec gt I Figure 7 C MEASUREMENT WITH THE OUT CASE REMOVED 1 When you replace the magnetron measure for microwave energy 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 Around the magnetron The waveguide WARNING AVOID CONTACTING ANY HIGH VOLTAGE PARTS D MEASUREMENT WITH FULLY ASSEMBLED OVEN 1 After all components including the outer panels are fully assembled measure for microwave energy leakage around the door viewing window the exhaust opening and air inlet openings 2 Microwave energy leakage must not exceed the values presc
12. ITION CHECK RESULT CAUSE REMEDY Lower than 90 of Decrease in power Suggest customer Output is gt Check the rating voltage source voltage contact local ieee with load electric power L Normal utility co or qualified electrician Defective Replace Magnetron Magnetron NOTE Simple test of power output conducted by heating one liter water for one min if available Minimum 8 5 C temperature rise is normal condition 29 TROUBLE 5 No microwave oscillation even though oven lamp and fan motor run Display operates properly CONDITION CHECK RESULT CAUSE REMEDY microwave Disconnect the No continuity Defective PCB Replace PCB oscillation wire leads from assembly assembly relay and check continuity of m Replace Inverter relay Operate TO VORNE and Magnetron the unit NOTE Make sure the wire leads correct position When Removing the lead wires from the 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 Output is full power Disconnect the x Abnormal Defective PCB 252 Replace when you set lower lead wires from assembly assembly power level relay and check continuity relay Operate the unit 30 EV EX
13. L G Website http biz Igservice com MICROWAVE OVEN MODEL LRMM1430SW LRMM1430SB CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL P NO 3828W5S3066 May 2003 Printed in Korea CAUTION WARNING TO SERVICE TECHNICIANS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY 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 5 evidence of dropping or abuse Before turning on microwave 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 adjusted by procedures described in this manual 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 Proper operation of the microwave ovens requires
14. ONTAINER IN THE OVEN A TEST PROCEDURES COMPONENTS TEST PROCEDURE RESULTS INVERTER Lead wires removed CN702 Heat Sink 701 High Voltage Output to Magnetron Control Signal In Out Note Do not try to repair the inverter board nor try to make any adjustments to the board Check wiring to the inverter 1 Unplug the oven s main power supply 2 Visually inspect 4 connectors on the inverter board CN701 CN702 CN703 E701 to see whether there are any signs of failure due to loose wires bad crimping sign of overheating etc MAGNETRON Lead wires removed Measure the resistance Ohm meter scale Rx1 Filament terminal Normal Less than 1 ohm 2 Measure the resistance Ohm meter scale Rx1000 Filament to chassis Normal Infinite 20 COMPONENTS TEST PROCEDURE RESULTS 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 SENSOR 1 Disconnect sensor connector from micom computer board 2 Measure resistance terminal to terminal Select the ohm scale on the meter A NOTE MAKE SURE THE LEAD WIRES ARE IN THE CORRECT POSITION WHEN REMOVING THE LEAD WIRES FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NOT THE WIRES Normal approximately BK RD 5 2 Kohms RD WH 2 1 Kohms BK WH 2 1 Kohms
15. PLODED VIEW INTRODUCTION OVEN CAVITY PARTS BASE PLATE PARTS CONTROL PANEL PARTS LATCH BOARD PARTS DOOR PARTS EV DOOR PARTS TR 50 Y EV CONTROLLER PARTS EV OVEN CAVITY PARTS LRMM 1430SW Model LRMM 1430SB 34 LATCH BOARD PARTS 35 EV OVEN INTERIOR PARTS 36 EV BASE PLATE PARTS SCHEMATIC DIAGRAM OF P C B N 7pin Connectorgl 4 INPUT 001 TMP87CM14 0 8 a C 8253828331333 3824282888 F zu 8 DOY y D92 093 094 095 096 y 184148 1N4148 IM4148 Y 1N4148 1N4148 1N4148 104148 MONITOR SMTCH Wu 3 4 KITCHEN
16. THE DOOR LATCH AND SWITCH CLOSINGS NOTE The out case of the microwave oven is removed 1 Set the microwave oven on its side so that you can see the latch board and the switches as shown in Figure 1 a 2 Close the door tightly and check gaps A and B to be sure they are no more than 1 64 0 5 mm See Figure 1 b for close up view of gaps A and B door latches If all gaps are less than 1 64 0 5 mm adjustment of the latch board may not be necessary Go to Steps 5 and 6 to check the sequence of the switches NOTE To correct sequence of the Primary Interlock Switch Secondary Interlock Switch and the Interlock Monitor Switch is very important If any gap is larger than 1 64 0 5 mm you will need to adjust the latch board U L Go to step 3 and follow all steps in order ADJUST THE LATCH AND SWITCH CLOSINGS 3 Loosen the screw holding the plastic latch board as shown 4 With the oven door closed tightly move the latch board upward toward the top of the oven and or away from the door latch until the gaps are less than 1 64 0 5 mm Hold the latch board tightly in this position until you check the sequence of the switches in steps 5 and 6 TEST THE LATCH AND SWITCH SEQUENCE 5 Open the oven door slowly Watch the door latch the Primary Switch Release Rod and Lever on the switches to make sure they are zero to the body of the switches in the following sequence Primary Interlock Switch Secondary Int
17. TOR IN SERIES TO GROUND WHEN RECONNECTING THE WIRE LEADS TO ANY PART MAKE SURE THE WIRING CONNECTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIRCUIT DIAGRAM ESPECIALLY SWITCHES AND HIGH VOLTAGE CIRCUIT Remove deco front A REMOVING OUT CASE Figure 8 1 2 3 4 Unfasten five screws from the rear section Unfasten two screws from the side section Push the out case back about 1 inch 3cm Lift the case from the set 2 LC YH wa Remove choke cap Choke Cap Figure 8 Remove door B DOOR ASSEMBLY REMOVAL Figure 9 1 Remove out case 2 Unfasten two screws for removing deco front 3 Disconnect the lead wires from main board and pull that out from the cavity 4 Remove the choke cap very carefully with a flat blade screw driver 5 Lift up and pull out Door assembly carefully from the cavity CAUTION Be careful not to damage door seal plate with the screw driver Figure 9 C REMOVING CONTROL CIRCUIT BOABD Figure 10 1 Remove out case 2 Remove door assembly 3 Unfasten two screws 4 Lift up and pull out control panel assembly carefully from the cavity 5 Remove door frame 6 Remove the F P C connector from the terminal socket 7 Unfasten two screws which tighen the circuit board 8 Remove control circuit board from the door panel assembly 5 6 Unfasten screws Door frame Cont
18. 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 repairing the door or the interlock system itis necessary to do this continuity test before operating the oven RESULTS SWITCHES Lead wires removed Check for continuity of the switch with an Ohm meter open Primary Switch TON Monitor Switch Da Secondary Switch EN connected correctly NOTE After checking for the continuity of switches make sure that they are 11 TEST AND CHECKOUT PROCEDURES AND TROUBLESHOOTING 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 LEAD WIRES FROM THE INVERTER MODULE 2 ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD 1 LITER OF WATER IN C
19. erlock Switch Interlock Monitor Switch Adjust the latch board until the switches operate in this sequence See Steps 3 and 4 6 Close the oven door slowly and be sure it is tightly closed Watch the three switches to make sure they are zero to the body of the switches in the following sequence Interlock Monitor Switch Primary Interlock Switch Secondary Interlock Switch NOTE The Interlock Monitor Switch is an added safety check on the Primary and Secondary Interlock Switches If the Primary and Secondary Interlock Switches allow the oven to operate with the door open the Monitor Switch will blow the fuse 7 When you achieve the proper sequence of switches in Steps 5 and 6 tighten the latch board screws at that point TEST THE MICROWAVE ENERGY LEAKAGE 8 Using a survey meter make sure the microwave energy is below 5 mW cm sq LATCH BOARD SECONDARY INTERLOCK SWITCH DOOR LATCH MONITOR INTERLOCK SWITCH PRIMARY INTERLOCK SWITCH Figure 1 a LATCH B ose LATCH BOARD A 0 1 64 Figure 1 b 2 PRECAUTIONS ON INSTALLATION Figure 2 Plug the power supply cord into a 120 V AC 60 Hz single phase power source with a capacity of at least 20 amperes Since the unit weights about 38 Ibs be sure to place it on a sturdy and flat surface Avoid placing the unit in a location where there is direct heat or splashing water Place the
20. h number for cooking power level O O G N Touch START 4 CHILD LOCK To set 1 Touch STOP CLEAR 2 Hold STOP CLEAR more than 2 seconds To cancel 1 Touch STOP CLEAR 2 Hold STOP CLEAR more than 2 seconds SOFTEN 1 Touch STOP CLEAR 2 Touch SOFTEN Four different soften menus are provided 3 Select Menu 1 to 4 See cooking guide 4 Enter the amount of the Category 5 Repeat steps 2 5 to set 2nd cooking stage 11 6 MELT 1 Touch STOP CLEAR 2 Touch MELT Four different melt menus are provided 3 Select Menu 1 to 4 See cooking guide 4 Enter the amount of the Category 7 AUTO DEFROST 1 Touch STOP CLEAR 2 Touch AUTO DEFROST Three different defrosting category are provided MEAT POULTRY FISH BREAD 3 Enter the weight of your food 4 Touch START 5 At beeping turn food over by following the instructions in the manual 6 After turning food over touch START to resume defrosting 8 Q DEFROST 1 Touch STOP CLEAR 2 Touch Q DEFROST 9 KITCHEN TIMER 1 Touch STOP CLEAR 2 Touch KITCHEN TIMER 3 Touch correct numbers for time 4 Touch START 8 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE A CAUTIONS 1 Be sure to check a microwave emission prior to servicing the oven if the oven is operative prior to servicing The service personnel should inform the manufacturer importer or assembler of any certified oven uni
21. interlock secondary interlock switches and or the interlock Fuse blows immediately after monitor switch the door is opened Fuse blows when the door is closed and START key Malfunction of the Inverter the magnetron is touched the fan motor or the circuit board NOTES If the fuse is blown by an improper switch operation replace the defective switches and the fuse at the same time After replacing the defective switches with new ones make sure that they are correctly connected Check for microwave energy leakage according to 1 ADJUSTMENT PROCEDURES on page 3 when the primary interlock secondary interlock switches and or the interlock monitor switches are adjusted or replaced 23 2 CHECKOUT PROCEDURES FOR RELAY FAN motor and oven lamp turn on without touching START key when the door is closed PROBLEM A G GOOD Remove the mate connector of I O CON from the circuit board does the unit still operate Replace the circuit board FAN motor and oven lamp turn on closed and START key is touched PROBLEM B When the door is a E GOOD Check the interlock switches IL pe Replace the micro switches Defective RELAY or poor connection of relay Replace RELAY or correct the connection 24 3 CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following sy
22. late 2 Remove air and suction guide 8 Remove the two screws holding the fan motor ASSEMBLY to the suction guide ASSEMBLY 4 Disconnect the wires and unfasten the screws 5 Pull out the Fan motor from the suction guide Fan Motor ASS Y Suction Figure 16 K 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 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 Check for play in the door by pushing the door release button Door movement should be less than 0 5 mm 1 64 inch Don t push the door release button while making this adjustment Make sure that the latch moves smoothly after adjustment is completed and that the screws are tight Make sure the primary monitor and secondary switches operate properly by following the continuity test procedure ADJUSTMENT DIRECTION MONITOR SWITCH PRIMARY E Figure 17 18 10 INTERLOCK CONTINUITY TEST W
23. mber keys that correspond to the desired cooking time The remaining time is continuously displayed during cooking 10 9 STOP CLEAR Key Used to stop the oven or clear all entries except CLOCK 10 AUTO DEFROST key DEFROST MEAT POULTRY FISH amp BREAD Used in setting AUTO DEFROST 11 Q DEFROST key Used in setting QUICK DEFROST 12 KITCHEN TIMER Key Used as a kitchen timer 13 POWER Key Used to select cooking power level 14 Ez ON Key It will add 30 seconds up to 3 minutes 30 seconds after 3 minutes 30 seconds every touch will add 1 minute up to 99 minutes 59 seconds 15 START Key Touch the START key after setting the desired cooking times etc Also touch the START key to resume cooking after the cooking is temporarily stopped by opening the door The key will not function unless the door is closed 16 Soften Used to soften ice cream cream cheese butter or frozen juice 17 Melt Used to melt chocolate cheese butter or marshmallows 18 More Less Used to adjust cooking time in 10 second increments C EASY USE CHART 1 CLOCK 1 Touch STOP CLEAR 2 Touch CLOCK 3 Touch numbers for correct time of day 4 Touch CLOCK 2 HI POWER COOKING 1 Touch STOP CLEAR 2 Touch COOK TIME 3 Touch numbers for desired cooking time 4 Touch START 3 MULTI STAGE COOKING Touch STOP CLEAR Touch COOK TIME Touch numbers for cooking time Touch POWER Touc
24. mptoms indicate a defective circuit board 1 Check the input current If the input current is more than 20A check the magnetron and wiring If the input current is less than 0 5 A there is no input to the inverter 2 The start function fails to operate but the interlock switches the door sensing and the relay check good 3 The unit with a normal relay continuously operates 4 The buzzer does not sound or continues to sound b Some segments of one or more digits do not light up or they continue to light up or segments light when they should not Wrong figures appear The figures of all digits flicker Some of the indicators do no light up The clock does not keep time properly 6 7 I 5 a NOTE MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON 25 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 Be careful of the Inverter 3 When checking the continuity of the switches or of the inverter 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 4
25. nd cooking time in multiples of 30 seconds by repeatedly touching this pad during cooking Start Touch this pad to start the oven B PANEL INSTRUCTIONS Figure 5 The entire operation is done by simple touch control pads 1 Display Window Numbers and letters explained in Figure 5 are shown in the display window Vacuum Fluorescent Tube a The Time in four digits 12 hour indication 00 Hour 00 Minute b Cooking Time of Day in four digits 00 Minutes 00 Seconds c Power Control Level in three digits P 000 d Each Indicator Light shows which function is set and involved in the course of cooking by turning itself on Indicator Lights automatically go out upon completion of cooking 2 SENSOR COOK key Use humidity sensor for certain food item 3 HOMEMADE BAKERY key 3 food categories of preset cooking time and power level Roll Muffin Pancake amp French Toast 4 CHICKEN CHOICES key 4 food categories of preset cooking time and power level Chicken Wings Chicken Nuggets Spicy Chicken amp Mexican Chicken 5 CHILDREN S LUNCH key 3 food categories of preset cooking time and power level Hot Dog Buns Frozen Pizza amp Canned Pasta 6 FAST BREAKFAST key 3 food categories of preset cooking time and power level Oatmeal Bacon amp Scrambled Eggs 7 CLOCK Key Used in setting Time of Day 8 COOK TIME Key The TIME key is used to set the cooking time Touch the TIME key and then the nu
26. nsumption TOTS A Power Supply Rated Current Magnetron Cooling Microwave Stirring Rectification Door Sealing Safety DEVICES e SR Tray Overall Dimensions Oven Cavity Size Effective Capadivo of Oven Cavity Owner s Manual amp Cooking Guide Turntable Rotating Ring Assembly Accessories SPECIFICATIONS 1250W maximum 1200W maximum IEC 60705 Rating standard Adjustable 0W through 1200W 10 steps 2 450 MHz 50 MHz 120 12V AC 60Hz 11 Amp Forced Air Cooling Turntable Rectification Voltage Doubler Half Wave Inverter type Choke System Thermostat Open at 90 Close at 75 Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor 2M261 125V 20W Digital up to 99 mm 99 sec in each cooking stage Tempered Safety Glass 2034 W x 151 4 D x 191 4 H 5 C 5 C 1714 W x 9 D x 163 4 H 1 4 Cu ft SWITCH CHART PRIMARY SECONDARY INTERLOCK SWITCH MODE INTERLOCK INTERLOCK MONITOR SWITCH SWITCH SWITCH COM COM COM CONDITIONS DOOR OPEN DOOR CLOSED NOTE Use the above switch chart with circuit diagram on page 7 PRIMARY 6 OVERALL CIRCUIT DIAGRAM A SCHEMATIC DIAGRAM INTERLOCK SWITCH FILTER BK RO C X
27. on The unit will begin cooking and the display window will show the time counting down by seconds After about 5 minutes make sure the primary interlock switch the secondary interlock switch and the interlock monitor and oven lamp switch operate properly by opening and closing the door several times Touch the START key each time the door is closed Continue operating the unit Two short and a long beep sound signal is heard when the time is up The unit will shut off automatically Confirm the water is hot Finally measure the output power according to POWER OUTPUT MEASUREMENT on page 13 FEATURES AND SPECIFICATIONS The safety systems incorporated in this model are 1 Primary interlock switch 2 Secondary interlock switch 3 Interlock monitor switch 4 Choke system 5 Oven cavity thermostat Note This thermostat located on the oven cavity will open and stop the unit from operation only if a high temperature is reached such as a fire created by overcooking food 2 c TC Any one of 10 power output levels ranging OW to 1200W can be selected by the touch control and electronic computer system Cooking time can be displayed on the digital readout Three different cooking stages Include Defrost can be set The oven remembers three cooking stages and changes from one cooking stage to another This is made possible with the memory function of the microprocessor Rated Power Co
28. 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 Magnetron Magnetron Gasket Waveguide Bracket Dome Waveguide Figure 14 17 I REMOVING THE TURNTABLE MOTOR 1 Remove the turntable and turntable roller rest 2 Lay the unit down on its back 3 Remove the turntable motor cover The turntable base cover is easily removed by pinching the four parts with a wire cutting 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the screw securing the turntable motor to the oven cavity ASSEMBLY 6 After repairing the motor rotate the removed turntable motor cover 7 Fit the turntable motor cover s projecting part to the base plate slit NOTE 1 Remove the lead wires from the turntable motor VERY CAREFULLY 2 Be sure to grasp the connector not the wires when removing Turntable Motor Figure 15 J FAN MOTOR ASSEMBLY REMOVAL 1 Separate cavity and base p
29. ribed below NOTES Leakage with the outer panels removed less than 5mW 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 1 mW cm Sq E NOTE WHEN MEASURING 1 Do not exceed meter full scale deflection 2 The test probe must be removed no faster than 1 inch sec 2 5cm 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 3 RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT After adjustment 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 Should the microwave energy leakage not be more than 1mW 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 13 G POWER OUTPUT MEASUREMENT Be sure oven cavity is clean and cool not
30. rol Panel F P C Connector Figure 10 D SEPARATE CAVITY AND BASE PLATE Figure 11 1 Remove out case 2 Remove Door Assembly 3 Remove five screws at the base plate Front 3 EA Back 2 EA 4 Disconnect the lead wires from filter Disconnect all the lead wires from main board Disconnect the MGT high voltage lead wire and turn table motor lead wire 7 Lift up the cavity and disconnect the fan motor lead wire o al CAUTION BE CAREFUL NOT TO DAMAGE LEAD Unfasten screws Figure 11 AIR GUIDE REMOVAL Figure 12 G SENSOR DUCT REMOVAL Figure 13 1 Separate cavity and base plate Remove out case 2 Unfasten the screws which hold the air guide in the Unfasten the sensor duct screw 1 2 base plate 3 Disconnect sensor lead wire 4 Pull the sensor duct out 3 Unfasten the air guide from hook F POWER BOARD AND INVERTER MODULE AND Figure 13 SUCTION GUIDE Figure 12 Separate cavity and base plate Remove air guide Unfasten the screws Lift up the power board inverter module and suction guide 1 2 3 4 Figure 12 16 MAGNETRON REMOVAL 1 Disconnect the leadwire from the magnetron 2 Carefully remove the mounting screws holding the magnetron at the waveguide 3 Remove the magnetron from the waveguide NOTE 1 When removing the magnetron make sure its dome does not hit any adjacent parts
31. soup cocoa or milk etc TROUBLE 1 The following visual conditions indicate a probable defective control circuit Incomplete segments Segment missing Partial segment missing Digit flickering NOTE Slight flickering is normal 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 indicates a number different from one touched for example key in 5 and 3 appears in the display Specific numbers for example 7 or 9 will not display when key pad is touched 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 programming when touching other pads 5 Display is fixed at some figure and can not accept any input 27 CONDITION CHECK RESULT CAUSE REMEDY 1 No input can be Check the conn Continuit Defective PCB Replace PCB programmed ection between y assembly assembly membrane key assembly and m Loose Connect them PCB assembly No
32. t found to have a microwave emission level in excess of 5mW cm sq 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 and CDRH Center for Devices and Radiological Health immediately NOTE Address on CDRH Office of Compliance HFZ 312 Center for Devices and Radiological Health 1390 Piccard Drive Rockville Maryland 20850 4 The service personnel should check all surface and vent openings for microwave emission testing 5 Check for microwave energy leakage after every servicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 1mW cm sq And always start measuring of an unknown field to assure safety for operating personnel from radiation leakage NOTE The standard is 5mW cm sq while in the customer s home 1mW cm sq stated here is manufacturer s own voluntary standard for units in customer s home 2 EQUIPMENT Electromagnetic energy leakage monitor NARDA 8100B HOLADAY HI 1501 600cc glass beaker Glass thermometer 1009C 7 12 B MEASURING MICROWAVE ENERGY LEAKAG
33. that the magnetron be assembled to the wave guide 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 Routine service safety procedures should be exercised at all times Untrained personnel should not attempt service without a thorough review of the test procedures and safety information contained in this manual FOREWORD Read this Manual carefully Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity MODEL LRMM1430SW LRMM1430SB MECHANICAL SERVICE INFORMATION TABLE OF CONTENTS 3 4 2 Precautions on Installation 5 3 General Precautions aduer 5 _ _ _33 lt 3 lt 2 __ 3______________ _ _ _ _ _ ___ _ _ _ _ _ _ 5 5 Features and SpecifiGations 5 6 5 Overall Circuit frd EE DUMP deg a ira 7 8 Operating Procedures ia 9 11 8 Procedure for Measuring Microwave Energy
34. unit as far away as possible from TV radio etc to prevent interference CAUTION This unit is equipped with a 3 prong plug for your safety If the wall outlet is a grounded 3 hole type the unit will be grounded automatically Properly Polarized and Grounded Outlet Three Pronged Grounding Plug Figure 2 3 GENERAL PRECAUTIONS IN USE A Never operate the unit when it is empty Operating the oven with no load may shorten the life of the magnetron Whenever cooking dry foods dried fish bread etc or a small amount of food be sure to put a glass of water into the cooking compartment The turntable tray may become hot after operating be careful when touching it Aluminum foil should be avoided because it will disrupt cooking and may cause arcing However small pieces may be used to cover some parts of food to slow the cooking Any aluminum foil used should never be closer than 2 5 cm to any side wall of the oven 4 TRIAL OPERATION After installation the following sequences and results should be checked carefully A B Put a container filled with water about 1 liter into the oven and close the door tightly Touch the STOP CLEAR and the COOK TIME keys 0 appears in the display window Set cooking time for 10 minutes by touching 1 and then 0 three times 10 00 appears in the display window Touch the START key Make sure the cavity light comes

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