MICROWAVE OVEN SERVICE MANUAL
Contents
1. yono yono eoueijsiseH 81 2 pue lt sed 995 LS Jaye JO eouejsise1 a nseayy joejuoo 100d E LS 201090002 Jo eouejsisel F 1201000 1094100 JO 199 109 MOUS JOU Ae ds q 8 IN3180Hd sung N EM eoueisisol suonoeuuoo joe11ooul M jeuuoN 1 LNO pue E D o1nseaw I 2 p 2 23 0 1VISONWH3HL ALIAVO N3AO 61 obed uo ISNA HOS LNOMOSHO 996 ISNA 2 Aldans 1 Jono SI p109 jddns je od usym ejdsip ul jou seop AVC JO 195 ISVIId H3ZZf 8 UU SWOJA AV IdSIQ 9 uo pee euojeg2. 2 8 6 EV INSTALLATION PARTS U COOKING 05 gt OWNERS Co 04 gt GUIDE 05 gt TEMPLATE 06 gt MANUAL MANUAL LABEL 8 7 LG
3. EQUIPMENT TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday HI 1500 HI 1501 Narda 8100 8200 600 cc non conductive material beaker glass or plastic inside diameter approx 8 5 cm 31 2 in Glass thermometer 100 or 212 1 deg scale MEASURING MICROWAVE ENERGY LEAKAGE Pour 275 15cc of 20 5 68 9 water in a beaker which is graduated to 600 cc and place the beaker on the oven 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 bcm 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 Probe scanning speed Less than 2 5 cm sec 1 in sec MEASUREMENT WITH THE OUTER 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 MEASUREMENT WITH A FULLY ASSEMBLED OVEN 1 After all components including the outer panels are fully assembl
4. 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 3 4 5 Any one of 10 power output levels ranging OW to 1000W 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 changes from one cooking stage to another This is made possible with the memory function of the microprocessor SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY 3 Do not operate the unit until it is completely repaired if any of the following conditions exist The unit must not be operated a The door does not close firmly b The hinge is broken c The door seal is damaged d The door is bent or warped or there is any other visible damage on the unit that may cause microwave energy leakage NOTE Always keep the seal clean e Make sure that there are no defective parts in the interlock mechanism A SINCE NEARLY 4000 VOLTS EXISTS IN SOME CIRCUITS OF THIS UNIT REPAIRS SHOULD BE CARRIED OUT WITH GREAT CARE The filament leads of magnetron carry High Voltage with respect to ground Extreme caution must be exercised Never plug the unit into a power source to determine which component is
5. Fuse blows when the door is closed and START Malfunction of the high voltage transformer the high key is touched voltage capacitor including the diode the magnetron the blower motor or the circuit board NOTES If the fuse is blown by an improper switch operation replace all 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 INTERLOCK ADJUSTMENT PROCEDURES on page 7 12 when the primary interlock secondary interlock switches and or the interlock monitor switches are adjusted or replaced 7 19 2 CHECKOUT PROCEDURES FOR RELAY PROBLEM A FAN motor turns on without touching START key when the door is closed PROBLEM A Oven lamp turns on without touching START key when the door is closed Re GOOD CON from the circuit board Does the unit still operate Remove the mate connector of I O je pe Replace the Defective circuit board Wire Assembly Replace Wire Assembly Remove the mate connector of I O CON from the circuit board Does the unit still operate Defective Wire Assembly GOOD Replace the circuit board Replace Wire Assembly PROBLEM B FAN motor turns on When the door is closed and START key is touched PROBLEM
6. 5 A1anoaL 3 eoejdeu TAH 91 obed ees jnunuoo 49949 eoueisise 69 91 2 obed ees Jo O NH 091000 eouejsiseu MN LAH LAH eouejsisel 81 ees Jeuuojsuel A H Jo eouejsise a nseayy 091000 eouejsiseu sung sung JeuuoN MO 1981002 joejuoo jewloNn 1091025 1981409 1004 jo LS Jojo9uu09 LE Peluog 91 4 ees Jo 19e uoo eui o ynuguoo IVLSONUSHL S3HOLIMS X20 TH3 1NI AHVOINOO3S ANY AHVIWIHd L 40 ex 1 16 umop e dsip dn yeay jou seop 3 7 23 pue 10 seD
7. Website http biz Igservice com MICROWAVE OVEN SERVICE MANUAL MODEL LMV1651SW LMV1651SB LMV1651SS UTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL August 2005 Printed in Korea P NO 3828W5S5299 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 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 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 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 manual before the oven is released to the owner A Microwave leakage check to verify compliance with the CSA Standard should be performed on each oven prior to release to the owner Proper operatio
8. with a hand Figure 19 3 Remove the base plate by removing 8 screws securing it to the oven cavity Figure 20 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the 1 screws securing the turntable motorto the oven cavity ASSY Figure 21 NOTES Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connector not the wires when removing Figure 19 Wire Leads 1 Turntable Motor Figure 21 REPLACING THE HUMIDITY SENSOR 1 Remove the sensor by removing two screws securing it to the air duct See Figure 22 2 Mount the new humidity sensor to the air duct Figure 22 7 11 INTERLOCK SYSTEM 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 ADJUSTMENT PROCEDURES To avoid possible exposure to microwave energy leakage adjust the door latches and interlock switches using the following procedure The Interlock Monitor and Primary Interlock Switch act as the final safety switch protecting the user from microwave energy The terminals between and of the Interlock Monitor must close when the door is opened After adjusting the Interlock Monitor Switch make sure that it is correctly connected Mounting of the
9. B Oven lamp turns on When the door is closed and START key is touched ps 5 Measure the voltage at m 1 4 of CN1 Voltage reading 120 V AC M Replace the Defective circuit board FAN motor Replace FAN motor Measure the voltage at pin NO 1 4 of CN1 Voltage reading 120 V AC p Replace the Defective circuit board Oven lamp Replace Oven lamp 3 CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board 1 The start function fails to operate but the high voltage Systems the interlock switches the door sensing and the relay check good 2 The unit with a normal relay continuously operates 3 Proper temperature measurement is not obtained 4 The buzzer does not sound or continues to sound 5 Some segments of one or more digits do not light up or they continue to light up or segments light when they should not 6 Wrong figures appear 7 The figures of all digits 8 Some of the indicators do no flicker light up 9 The clock does not keep time properly NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON 7 21 joejuoo 19901102 sung
10. The oven s sensor will tell the oven how long to cook depending on the amount of humidity coming from the food 7 REHEAT Touch this pad to reheat dinner plate soup sauce and casserole The oven s sensor will tell the oven how long to reheat depending on the amount of humidity coming from the food 8 CUSTOM COOK Touch this pad to recall one cooking instruction previously programmed into memory 9 TIME COOK Touch this pad to set a cooking time 10 POWER LEVEL Touch this pad to select a cooking power level 11 AUTO DEFROST Meat poultry fish Touch this pad to select food type and defrost food by weight 12 TIME DEFROST Touch this pad to defrost most other frozen foods 4 3 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 DEFROST This pad provides you with the RAPID defrosting method for 1 0 pound frozen foods NUMBER Touch number pads to enter cooking time power level quantities or weights CUSTOM SET Touch this pad to change the oven s default settings for sound clock display speed and defrost weight CLOCK Touch this pad to enter the time of day KITCHEN TIMER Touch this pad to set the kitchen timer MORE Touch this pad to add ten seconds of cooking time each time you press it LESS Touch this pad to subtract ten seconds of cooking time each time you press it HOLD WARM Touch this pad to keep hot cooked foods warm in yo
11. between the final water temperature and the ambient temperature is 5 K 6 The microwave power output P in watts is calculated from the following formula 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 4 RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT 1 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 1 mW cm 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 2 3 4 187 Mw T2 T1 0 55Mc T2 t is measured while the microwave generator is operating at full power Magnetr
12. door parallel to the chassis Also adjust so the door has no NOTES play between the inner door surface and oven frame assemblylf the door assembly is not mounted properly microwaves may leak from the clearance between the door and the oven After replacing the door be sure to check that the primary interlock switch the secondary interlock switch and the interlock monitor switch is in good operating normally After replacing the door check for microwave e EC energy leakage with a survey meter Microwave energy t leakage must be below the limit of bmW em With a 275 ml water load REMOVING THE VENTILATION ASS Y 1 Remove the mounting plate by removing two screws securing it to the back plate See Figure 17 2 Remove the two screws securing the MOUNT ALL and one screw securing the ventilation fan ASS Y See Figure 18 a Figure 15 G DISASSEMBLING DOOR Figure 16 1 Remove the dielectric choke by using knifeblade or small screw driver etc 2 Remove two screws securing it to the door handle CAUTION Be careful not to damage door seal plate with the screwdriver MOUNT ALL Figure 18 a Figure 16 7 9 3 Carefully pull the ventilation motor ASS Y out ofthe microwave oven See Figure 18 b Figure 18 b 7 10 J REMOVING THE TURNTABLE MOTOR 1 Remove the glass tray and rotating ring 2 Remove the turntable shaft VERY CAREFULLY
13. primary monitor secondary switches to the latch board Latch Board Primary Interlock Switch Interlock Monitor Switch Secondary Interlock Switch Figure 23 a LATCH 0 1 64 Figure 23 b LATCH BOARD 0 1 64 CHECK THE DOOR LATCH AND SWITCH CLOSING NOTE The outer cover 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 23 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 23 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 seguence of the switches NOTE To correct seguence 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 Go to step 3 and follow all steps in order ADJUST THE LATCH AND SWITCH CLOSING 3 Loosen the two screws 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 seguence of the switches in steps 5 and 6 TEST THE LATCH
14. AND SWITCH SEQUENCE 7 When you achieve the proper sequence of switches in Steps 5 and 6 tighten the latch board 5 Open the oven door slowly Watch the door latch screws at that point the Secondary Switch Release Rod and Lever on the switches to make sure they are zero to the TEST THE MICROWAVE ENERGY LEAKAGE body of the switches in the following sequence Make sure the microwave energy leakage is below the Primary Interlock Switch limit of 1mW cm with a 275 ml water load and 5mW cm with a 275 ml water load without the Secondary Interlock Switch Interlock Monitor Switch cabinet when measured with a survey meter Adjust the latch board until the switches operate in this seguence 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 seguence 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 INTERLOCK CONTINUITY TEST A PRIMARY INTERLOCK SWITCH TEST B SECONDARY INTERLOCK SWITCH TEST When the door is opened slowly an audible click Disconnect the wire lead from the secondary should be heard at the same time or successi
15. E ha avenge E 5 1 MATRIX CIRCUIT FOR TOUCH KEY BOARD 00 00 0000 000000000000 5 2 GENERAL INFORMATION FOR 6 1 GENERAL PRECAUTIONS IN USE 6 1 TRIAL OPERATION oireen PEU UT EO EM EE RU RE ERR a RR REDEEM 6 1 FEATURES AND SPECIFICATIONS FEATURES eee 6 1 SERVICE INFORMATIGON ke Gp st rain an 7 1 PRECAUTIONS AND REPAIR SERVICE 7 1 MICROWAVE LEAKAGE TEST 7 2 POWER OUTPUT MEASUREMENT visit tace ie eet kn ichs 7 3 DISASSEMBLY INSTRUCTIONS eee eee een 7 4 INTERLOCK SYSTEM 23 ee u lan nr 7 12 INTERLOCK CONTINUITY TEST aceite ig tei erp Halten 7 14 TEST AND CHECKOUT PROCEDURES AND 5 7 15 A TEST PROCEDURES iiiter p RH n RETE P b ER 7 15 CHECKOUT PROCEDURES cated ieee ea Huren 7 20 TROUBLESHOOTING ne ein En 7 22 EXPLODED VIEW deep dete mre 8 1 REPLACEMENT PART er ee 9 1 SPECIFICATIONS Rated Power Consumption Microwave Output Freguency Power Supply Rated Current Magnetron Cooling Rectificatio
16. EAT OUICK DEFROST 29 9 HI LOW OFF TIMER 4 1 CONTROL PANEL II For Model LMV1651SS Sensor Touch POPCORN POTATO PIZZA VEGETABLE COOK REHEAT CUSTOM TIME POWER COOK COOK LEVEL AUTO TIME Q DEFROST DEFROST DEFROST CUSTOM CLOCK KITCHEN TIMER HOLD WARM STOP BUT LIGHT TIMER LIGHT VENT VENT CONTROL HI LOW OFF ON OFF 5 SPEED Ez ON 4 2 CONTROL PANEL INSTRUCTIONS 1 DISPLAY The Display includes a clock and indicators to tell you time of day cooking time settings and cooking functions selected 2 POPCORN Touch this pad when popping popcorn in your microwave oven The oven s sensor will tell the oven how long to cook depending on the amount of humidity it detects from the popcorn 3 POTATO Touch this pad to cook potatoes The oven s sensor will tell the oven how long to cook depending on the amount of humidity it detects from the potato 4 PIZZA Touch this pad to reheat pizza The oven s sensor will tell the oven how long to reheat depending on the amount of humidity it detects from the pizza 5 VEGETABLE Touch this pad to cook vegetables The oven s sensor will tell the oven how long to cook depending on the amount of humidity it detects from the vegetables 6 COOK Touch this pad to cook frozen entree casserole and rice
17. ELAY MONITOR SWITCH Wi RD 112 3 o 9 ET TRANSFORMER RC RS THERMISTOR CAPACITOR H V DIODE ABSOLUTE HUMIDITY SENSOR MAGNETRON NOTE DOOR IS OPENED O L OVEN LAMP TURN TABLE MOTOR FAN MOTOR S M STIRRER MOTOR V M VENTILATION MOTOR C L COOKTOP LAMP CONTROL MODULE WIRE COLORS BL WH YL BN BK PK BL WH RD BK SYMBOL COLOR D0 w mr 1 BE 8 11 12 T YELLOW PK PK BLUE 12 PIN CONNECTOR CN1 SEINES A GREEN CN1 CONNECTOR GREY FOR SENSOR 5 1 MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX 2 D 4 7 A A A A A 2 COOK COOK TIMER 7 Bof VEGETABLE N C POTATO PIZZA 8 N C TIME CUSTOM wc LIGHT N C 0 9 A A A ON OFF 5 10 AUTO TIME Q Popcorn COOK REHEAT N C DEFROST DEFROST DEFROST 17 2 2 A A 21 LA 44 CUSTOM HOLD KITCHEN SET WARM 4 N C 4 TIMER MORE LESS 5 A A A POWER STOP 2120 A CLEAR 8 om 13 5 2 GENERAL INFORMATION FOR SERVICE 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 glass turntable may become hot after operating be care
18. Measure resistance ohm meter scale Rx1000 Filament to chassis COMPONENTS TEST RESULTS TRANSFORMER FILAMENT SECONDARY WINDING PRIMARY WINDING 1 Remove wire leads 2 Measure resistance ohm meter scale Rx1 Primary winding Approx 0 2 to 0 5 ohms Secondary winding Approx 50 to 120 ohms Filament winding 0 ohm 3 Measure resistance ohm meter scale Rx1000 Primary winding to ground Normal Infinite Filament winding to ground Normal Infinite MAGNETRON Normal Less than 1 ohm Normal Infinite 7 15 COMPONENTS TEST RESULTS Remove wire leads CAPACITOR 2 Measure resistance ohm meter scale Rx1000 Terminal to terminal Normal PEN Momently indicates AN several ohm and then gradually returns to infinite Terminal to case Normal Infinite DIODE 1 Measure continuity Forward Normal Continuity Some inexpensive ohm ohm meter scale Rx1000 Abnormal Infinite ZA meters may indicate infinite resistance in both directions 2 Measure continuity Reverse Normal Infinite AN ohm meter scale Rx1000 Abnormal Continuity c 3 E RELAY 7 1 Measure continuity ohm meter scale Rx1 12 2 Remove the lead wires and operate oven at 1 4 Sec 18 Sec power level 1 through power level 10 2 6 Sec 16 Sec 3 8 Sec 14 Sec 4 10 Sec 12 Sec 5 12 Sec 10 Sec 6 14 Sec 8Sec 7 16 Sec 6 Sec 8 18 S
19. NALS MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL INSTALLATIONS BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY PRECAUTIONS ON INSTALLATION A Plug the power supply cord into a 120V AC 60Hz single phase power source with a capacity of at least 20 amperes B Avoid placing the unit in a location where there is direct heat or splashing water C Install the unit on the mounting plate firmly D Place the unit as far away as possible from TV radio etc to prevent interference GROUNDING INSTRUCTIONS For personal safety this appliance must be fully grounded at all times In the event of an electrical short circuit grounding reduces the risk of electrical shock The plug must be plugged into an outlet that is properly installed and grounded CAUTION This unit is eguipped with a 3 prong plug for your safety If the wall outlet is a grounded 3 hole type the unit will be grounded automatically Plug with Ground Prong Properly Polarized and Grounded Outlet WARNING Improper use of the grounding plug can result in a risk of electric shock Do not under any circumstances cut or remove the third ground prong from the power cord plug 3 1 OPERATING INSTRUCTIONS CONTROL PANEL For Model LMV1651SW LMV1651SB CUSTOM SET CUSTOM COOK CLOCK Ten SENSOR TOUCH REH
20. board Circuit Board Figure 2 5 Remove the FPC connector from the terminal socket following HOW TO REMOVE THE FPC CONNECTOR on the next page 6 Remove the circuit board from the control bracket carefully Control Bracket FPC Connector S1 Circuit Board Figure 3 HOW TO REMOVE THE F P C CONNECTOR Follow the steps below as illustrated in Figures 4 and 5 to remove the F P C connector 1 Hold the edges of the plastic fastener with thumb and forefinger Figure 4 2 Lift up the lever of the plastic fastener from the terminal socket by lightly pressing the lever end with forefinger Figure 5 3 Remove the F P C connector from the terminal socket Plastic fastener Connector Terminal socket Figure 4 Plastic fastener Connector Terminal socket Figure 5 HOW TO INSERT THE F P C CONNECTOR Follow the steps below as illustrated in Figures 6 and 7 to insert the F P C connector 1 Insert the F P C connector into the terminal socket securely with the fingers 2 Hold the plastic fastener with thumb and forefinger of the other hand and push it slowly into the terminal socket Figure 6 NOTE When reconnecting the F P C connector make sure that the holes on the F P C connector are properly engaged with the hooks on the plastic fastener Lock the level of the plastic fastener into the hook of the terminal socket securely by relea
21. defective in high voltage section B TO AVOID POSSIBLE EXPOSURE TO f Make sure that there are no detective parts MICROWAVE ENERGY LEAKAGE THE in the microwave generating and transmission BEFORE SERVICING 1 Before the power is applied 4 The following items should be checked after the a Make sure the primary interlock switch the unit is repaired fer secondary interlock switch and the interlock a The interlock monitor switch is connected monitor switch operate properly by opening correctly and firmly and closing the door several by opening and b The magnetron gasket is properly positioned closing the door several times and mounted Make sure the perforated screen and the c The waveguide and the oven cavity are intact dielectric choke of the door are correctly and no microwave energy leakage firmly mounted d The door can be properly closed and the safety switches work properly e The unit must stop when the door is opened or 2 After power is applied the time is up a Make sure the interlock switch mechanism is operating properly by opening and closin the 5 5 5 The unit must not be operated with any of the above components removed or by passed b Check microwave energy leakage must be below the limit of 5 mW cm All service adjustments should be made for minimum microwave energy leakage readings 7 1 MICROWAVE LEAKAGE TEST CAUTIONS Be sure to check microwave leakag
22. e 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 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 The service personnel should check all surface and vent openings for microwave emission testing Check for microwave energy leakage after every servicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 1 54 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
23. ec 4 Sec 9 205 2Sec 10 225 0 FAN MOTOR 1 Remove wire leads Normal Approximately 2 Measure resistance ohm meter scale Rx1 Terminal 85 to 105 ohms Terminal A 8 15 to 25 ohms Abnormal Infinite or several COMPONENTS TEST RESULTS VENTILATION MOTOR 1 Remove lead wires 2 Measure resistance ohm meter scale Rx1 Normal Approximately 50 to 70 ohms Abnormal Infinite TURNTABLE MOTOR 1 Remove wire leads 2 Measure resistance ohm meter scale Rx1000 Normal Approximately 2 5 to 3 5 Kohms Abnormal Infinite or several ABSOLUTE HUMIDITY SENSOR FOR SENSOR MODEL 1 Disconnect sensor connector from micom computer board 2 Measure resistance terminal to terminal ohm meter scale R X 1000 1 m BK 2 m RD W WH Normal Approximately BK RD 6 0 Kohms RD WH 3 0 Kohms BK WH 3 0 Kohms Abnormal Infinite or approx 0 ohm STIRRER MOTOR 1 Remove lead wires 2 Measure resistance ohm meter scale Rx1000 Normal Approximately 120 to 135 ohms Abnormal Infinite COMPONENTS TEST RESULTS Measure the resistance between terminal TOUGH KEX BOARD pins of connector KEY CONNECTOR When Whennot NOTE Resistance touched touched When rec
24. ed 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 NOTES Leakage with the outer panels removed less than 5 mW cm 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 POWER OUTPUT MEASUREMENT 1 Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of 1000 5 g of potable water 2 The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 1 8 3 mm and an outside diameter of approximately 7 6 190mm 8 The oven and the empty vessel are at ambient Temperature TO prior to the start of the test 4 The initial temperature T1 of the water is 10 1 50 F 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 turntable which is in the lowest position and the microwave power switched on 5 The time t for the temperature of the water to rise by a value T of 10 1 K is measured where t is the time in seconds and T is the temperature rise The initial and final water temperatures are selected so that the maximum difference
25. ejs y Burzznq 4 7 24 A SSV 10 0 A SSV suni ON MO 1281002 9 ees 15 J0P9UUOO yO 49949 pue joejuoo jeisouueu 1084105 joejuoo 1004 jo joejuoo BY YOSYD 6 1 1 joejuoo pue lt gt 7 25 3505 AlddNS H3MOd L si 44 jou seop uej WITAOHd EXPLODED VIEW DOOR PARTS FOR MODEL LMV1651SW LMV1651SB FOR MODEL LMV1651SS EV CONTROLLER PARTS FOR MODEL LMV1651SW LMV1651SB EV OVEN CAVITY PARTS For LMV1651SS LMV1651SB LATCH BOARD PARTS EV INTERIOR PARTS I EV INTERIOR PARTS Il
26. ful 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 TRIAL OPERATION After installation the following seguences and results should be checked carefully A Put a container filled with water about 1 liter into B the oven and close the door tightly Set cooking time for 10 minutes by touching 1 and then 0 three times 1 0 0 0 appears in the display window Touch the START key Make sure the cavity light comes 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 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 7 3 6 1 FEATURES AND SPECIFICATIONS FEATURES A The safety systems incorporated in this model are 1 Primary interlock switch 2 Secondary interlock switch
27. is necessary to do this continuity test before operating the oven COMPONENTS TEST PROCEDURE RESULTS SWITCHES Check for continuity of the Door Wire leads removed switch with an Ohm meter open Primary o Switch BEN Monitor Switch Secondary Switch NOTE After checking for the continuity of switches make sure that they are connected correctly WARNING FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS TYPE NO SZM V16 FA 63 OR VP 533A OF OR 52300 FOR PRIMARY SWITCH TYPE NO SZM V16 FA 62 OR VP 532A OF OR V 52200 FOR MONITOR SWITCH TYPE NO SZM V16 FA 63 OR VP 533A OF OR V 52300 FOR SECONDARY SWITCH TEST AND CHECKOUT PRECEDURES 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 PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER 2 ALLOPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD 1 LITER OF WATER IN CONTAINER IN THE OVEN A TEST PROCEDURES Antenna Gasket Chassis et Filament 1 Remove wire leads Install the magnetron seal in the correct position Check that the seal is in good condition 2 Measure resistance ohm meter scale Rx1 Filament terminal 3
28. n Door Sealing Safety Devices Magnetron Cook top Lamp Cavity Lamp Timer Tray Overall Dimensions Oven Cavity Size Effective Capacity of Oven Cavity Accessories 1500W maximum Microwave oven Cook top lamps Ventilation fan 1000W IEC60705 2450 MHz 50 MHz 120 VAC 60 Hz 13 3 Amp Microwave oven Cook top lamps Ventilation fan Forced Air Cooling Rectification Voltage Double Half Wave Choke System Magnetron Thermostat Open at 145 5 C Close at 60 C 5 C Oven Thermostat Open at 110 C 5 C Close at 0 C 5 Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Switch 2M246 310GT 120 V 30 W 125 V 30 W or 40 W Digital up to 99 min 99 sec in each cooking stage Tempered Safety Glass 2915 16 W x167 16 H x153 s D 207 2 W x93 se H x143 e D 1 6 Owner s Manual amp Cooking Guide Installation Manual Exhaust Adapter Exhaust Damper Mounting Kit and Filter Support Hub Glass Tray Metal Rack SWITCH CHART PRIMARY SECONDARY INTERLOCK SWITCH MODE INTERLOCK INTERLOCK MONITOR SWITCH SWITCH SWITCH COM COM COM CONDITIONS NO NO NC DOOR OPEN OPEN OPEN CLOSE DOOR CLOSED CLOSE CLOSE OPEN NOTE Use the above switch chart with circuit diagram on page 5 1 1 1 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 sho
29. n of the microwave ovens requires that 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 e 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 TABLE OF CONTENTS Page SAFETY PRECAUTIONS Inside front page SPECIFICATIONS latente ei fire 1 1 CAUTIONS PA a SOLO ein 2 1 INSTALLATIONS ERE eite bec nt uot nb e erh 3 1 OPERATING INSTRUCTIONS a AH 4 1 CONTROL PANEL tbt eH RERO M 4 1 CONTROL Pr ato GP 4 2 CONTROL PANEL INSTRUCTIONS 4 3 OVERALL CIRCUIT DIAGRAM i irte tricot 5 1 SCHEMATIC DIAGRAM R
30. ock Switch REMOVING MAGNETRON 1 2 Figures 11 Through 12 Remove the vent grille by loosening two screws Figure 11 Remove the outcase See page 7 6 3 Remove four tap tite screws securing the 4 magnetron to the wave guide Disconnect the leadwire 5 Remove the magnetron VERY CAREFULLY NOTES When removing the magnetron make sure that its dome does not hit any adjacent parts or it may be damaged 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 After replacing the magnetron check for microwave energy leakage with a survey meter Check microwave energy leakage must be below the limit of 5 mW cm All service adjustments should be made for minimum microwave energy leakage readings mount all 42 Y AS PS 4 87 72 SE gun N 6 s SN Figure 12 agnetron E REMOVING STIRRER FAN Figures 13 and 14 1 Remove one rivet ASS Y securing it to the oven upper plate by using knife blade 2 Remove the stirrer fan cover 3 Remove the stirrer fan Figure 13 Figure 14 F REMOVING DOOR Figure 15 H ASSEMBLING DOOR 1 Remove the vent grille by two screws securing it to 1 When mounting the door assembly to the oven the outcase loosening assembly be sure to adjust the door assembly 2 Lift up and draw the
31. on filament heat up time is not included about 3 sec 7 The water is stirred to equalize temperature throughout the vessel prior to measuring the final water temperature 8 Stirring devices and measuring instruments are selected in order to minimize addition or removal of heat P Where P is the microwave power output in watts Mw is the mass of the water in grams is the mass of the container in grams 0 is the ambient temperature in C T1 is the initial temperature of the water in C T2 is the final temperature of the water in C tis the heating time in seconds excluding the magnetron filament heat up time WATER LOAD DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES UNIT MUST BE DISCONNECTED FROM ELEC TRICAL OUTLET WHEN MAKING REPAIRS RE PLACEMENTS ADJUSTMENTS AND CONTIN UITY CHECKS WHEN RECONNECTING THE WIRE LEADS TO ANY PART MAKE SURE THE WIRING CONNE CTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIR CUIT DIAGRAM ESPECIALLY SWITCHES AND HIGH VOLTAGE CIRCUIT A REMOVING POWER AND CONTROL CIRCUIT BOARD Figures 1 2 and 3 1 Remove a screw securing the control panel assembly to the oven cavity 2 Remove the control panel with pushing it upward 3 Remove the connectors CN1 CN3 and wire leads RY7 from the circuit board Control Panel Circuit Board Figure 1 4 Remove 5 screws securing the circuit
32. onnecting the FPC connector value ess than More than make sure that the holes on the FPC 400 ohms 1 mega ohm connector are properly engaged with hooks on the plastic fastener FPC CONNECTOR MATRIX CIRCUIT FOR Top TOUCH KEY BOARD 77 CONNECTOR KEY CON s 9 4 1 2 3 4 5 6 7 M Ed iE 1 2 3 4 5 6 7 d 8 MAA A Ff VENT enrconrrot LIGHT EGETABLE N C POTATO PIZZA i gt ON OFF 5 SPEED Hi Low Off 5 10 Le ee AUTO TIME o POPCORN COOK REHEAT DEFROST DEFROST DEFROST CUSTOM HOLD KITCHEN SET WARM N C TIMER CLOCK MORE LESS 12 P M BEE POWER STOP LEVEL NC CLEAR RIAL 8 9 9 13 M bh Jo NOTES AMICROWAVE ENERGY 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 7 18 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 interlock secondary Fuse blows immediately after interlock switches and or the interlock monitor switch the door is opened
33. sing the fingers Figure 7 Plastic fastener Connector Terminal socket Figure 6 Plastic fastener Terminal socket Figure 7 B REMOVING THE OUT CASE Figure 8 1 Remove the vent grille by removing two screws securing it to the out case 2 Remove two screws securing it to the air duct 3 Remove the mounting plate by turning the screws 1 or 2 screws securing it to the out case 4 Remove two screws on the left central edge and one screw on the right central edge of Base plate Remove the Mount All from the out case by removing one screw securing it to the out case Remove six screws of the rear cavity Remove the outcase Mount All Power cord cover Mounting Plate Out Case Controller Vent Grille Figure 8 C REMOVING THE DOOR INTERLOCK SWITCHES Figures 9 10 1 Disconnect the wire leads from the interlock switches 2 Remove two screws securing the Latch Board 3 Make necessary replacements and check microwave energy leakage according to ADJUSTMENT PROCEDURES on page 7 12 Latch Board ug Figure 10 WIRE COLOR SYMBOL COLOR WHITE BK BLACK BR BROWN RD RED YL YELLOW PK PINK BL BLUE GY GREY GN GREEN Not Provided Latch Board Primary Interlock Switch Monitor Interlock Switch Secondary Interl
34. uld 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 Remove your watches whenever working close to or replacing the Magnetron DO NOT touch any parts of the control panel circuit A resulting static electric discharge may damage this P C B NEVER operate the oven with no load NEVER injure the door seal and front plate of the oven cavity NEVER put iron tools on 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 FILAMENT TERMI
35. ur microwave oven for up to 99 minutes 99 seconds STOP CLEAR Touch this pad to stop the oven or to clear all entries START Touch this pad to start a function If you open the door after oven begins to cook START again LIGHT TIMER Touch this pad to set the light timer Ez ON Touch this pad to set and start guickly at 100 power level LIGHT HI LOW OFF Touch this pad to turn on the cooktop countertop light VENT ON OFF Touch this pad to turn the fan on or off VENT CONTROL 5 SPEED Touch this pad to choose one of 5 fan speeds OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM 120 VAC 60Hz SINGLE PHASE ONLY OVEN WAVEGUDE NOISE MICOM CONTROLLER ASS Y THERMOSTAT THERMOSTAT FILTER ASM LV 3 230 F 32 F ore BK WH TRANS BK FORMER THERMOSTAT RY eure 293 140 3 RELAY 1 RD RY2 7 LAMP 3 5 BK HIGH RELAY YL RY3 4 YL CITOP LAMP gt LOW 6 BK RELAY BK 7 WH RY5 BR VENT 3111 8 PRIMARY CL FAN SWITCH ON OFF RELAY rm M 8081 5 10 Scl 5LVL PR BK 2 0 BL RY7 POWER 3 R
36. vely switch at intervals and the latches should activate the Connect the ohmmeter leads to the common switches with an audible click COM and normally open NO terminals of the If the latches do not activate the switches when the switch The meter should indicate a open circuit in door is closed the switches should be a adjusted the door open condition When the door is closed in accordance with the adjustment procedure meter should indicate an closed circuit When the Disconnect the wire lead from the primary switch secondary switch operation is abnormal make the Connect the ohmmeter leads to the common necessary adjustment or replace the switch only COM and normally open NO terminal of the with the same type of switch switch The meter should indicate an open circuit in the door open condition C MONITOR SWITCH TEST 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 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 it
Download Pdf Manuals
Related Search