Service Manual - Appliance Factory Parts
Contents
1.2. 2 4 L g
3. PRINTED CIRCUIT BOARD we E d 2 6
4. SYMBOL COLOR WH WHITE BK BLACK 120 VAC 60Hz N RD RED SINGLE PHASE S D YL YELLOW ONLY GND PK PINK FUSE 20A r AL FILTER ASM BK WH p e 1 MICOM CONTROLLER GND 1 WH THERMOSTAT 3 m ONEN 110 C 230 F RR M 3 11213141516 TRANSFORMER 12 LE 916 2 4 T BK BL RY 1 Im 25 12 IL 1121 CONDENSER RY6 RD F M S M WH a 11 1 gj BM V M IT WH RY 14 1 z BL C L HIGH L lus T LAMP 2 2 4 BK RY 15 x BK C L NIGHT sE BL e RD PRIMARY PK si SWITCH RY 2 8 Inverter cre ABSO RD STIRRER TURNTABLE SECONDARY gi 8 5 0 MOTOR MOTOR SWITCH PK 141 BOTTOM Option NO i BN CN4 NO SURGE ABSOLUTE HUMIDITY l MONITOR ABSORBER SENSOR SWITCH RD WH CNS U04 RD WH 11513 tHermistor 112131411 BK 1211 211 OO 4 CN702 3 2 3 2 CN701 INVERTER cN703 Li VENT LIGHT CONTROL BOARD 3 ET MAGETRON L J 5 1 MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX 4 22 21 02 02 m 27 22 12 SUD DEI Sop ODS aa Fa gl cCL JEL_ FL 1 1 pe GRES 5 2 GENERAL INFORMATION FOR SERVICE GENERAL PRE
5. 5 8 17 P NO 3828W5S2629 Printed in Korea
6. 2 Colon does not turn on or blink 3 A distinct change in the brightness of one or more numbers in display 4 One or more digits in the display are not lighting 5 Display indicates a number different from one touched for example key in 5 and 3 appears in the display 6 Specific numbers will not display when key pad is touched 7 Display does not count down with time blinking or up with clock operation 8 Display obviously jumps in time while counting down 9 Display counts down too fast while cooking 10 Each indicator light does not turn on after setting cooking cycle 11 Display time of day does not reappear when cooking is finished CONDITION CHECK RESULT CAUSE REMEDY 1 No input can be Check the conn Continuity Defective PCB Replace PCB programmed ection between assembly assembly membrane key assembly and Deli Loose Connect them PCB assembly 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 gt Defective PCB Replace PCB number or figure assembly assembly 7 23 TROUBLE 2 Oven does not operate at all Display window does not display any figures and no input is accepted CONDITION CHECK RESULT CAUSE REM
7. yanmis 1508430 wuvm 8003 aama F ia auns AND 3 80 4 N3Z0Y4 I 0856 08 2 9 9 d ix i id iw ver 99 5 9 Prod 29 6 6 560 sea A ved A A oi ose isa 1 77 ME m ole E hz ose P bz 6 1 cbr 1 sal sj Taj ssa nal VEZOVSMZOE9 sta pa 9 i tda 28924865 178 tonora c osy 59 SLY MT yoe viu 150 Eni 4 d zea wae 2 ALANNAH Dar 2 T ISO As i 231 sun aem zeoze enon ae is gt veionemaessaus SNO 75 sad I z BY m s 198 059 sion 68 25903 NvLW2Z8dWI suntioze 5 Y 08433 eon 59 520 HeEvASMOESSrON G Y nose veoovemezes a npow 1 HOLIMS DIA 259 70 53 8314 238 BOLDVAVIIA Lul NOYLINDVN I
8. c The waveguide and the oven cavity are intact no microwave energy leakage d The door can be properly closed and the safety switches work properly e The unit must stop when the door is opened or the time is up The unit must not be operated with any of the above components removed or by passed MICROWAVE LEAKAGE TEST CAUTIONS Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing 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 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 le
9. when the door is closed when the door is closed pe e p GOOD Remove the mate connector of I O CON from the circuit board Does the unit still operate Remove the mate connector of I O CON from the circuit board Does the unit still operate GOOD Po 5 Replace the circuit board Defective Wire Assembly 9 ee Replace the circuit board Defective Wire Assembly Replace Wire Assembly Replace Wire Assembly FAN motor turns on When the door is closed and PROBLEM B START key is touched PROBLEM B Oven lamp turns on When the door is closed and START key is touched GOOD Measure the voltage at pin NO 1 5 of ON1 Voltage reading 120 V AC a Measure the voltage at pin NO 29960 1 4 of CN1 Voltage reading 120 s Replace the circuit board Defective FAN motor Replace FAN motor 7 20 5 us 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 Check the input current If the input current is more than 20A check the magnetron and wiring If the input current is le
10. 50 MHz Power Supply 120 60 Hz Rated Current 12 Amp Microwave oven Cook top lamps Ventilation fan Magnetron Cooling Forced Air Cooling Rectification os Rectification Voltage Double Half Wave Door Sealing in Choke System Safety Devices Phermostat Open 110 5 C Close at 0 C 5 C Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Switch Inverter gt EE Pa Magnetron 2M261 Cook top Lamp 120 V 20 W Halogen Cavity 125 30 40 W 11 6 Digital up to 99 min 99 sec in each cooking stage HHVN Tempered Safety Glass Overall DIMENSIONS 2915 16 W x 167116 H x153 e D Oven Cavity Size 231 2 W x108 16 H x141 2 D Effective Capacity of Oven Cavity 2 0 Cu ft Accessories eme eret triente Owner s Manual amp Cooking Guide Installation Manual Exhaust Adapter Exhaust Damper Mounting Kit and Filter Rotating Ring Assembly Glass Tray Metal Rack SWITCH CHART PRIMARY SECONDARY INTERLOCK SWITCH MODE INTERLOCK INTERLOCK MONITOR SWITCH SWITCH SWITCH COM COM COM CONDITIONS DOOR OPEN DOOR CLOS
11. 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 V 5230Q FOR PRIMARY SWITCH TYPE NO SZM V16 FA 62 OR VP 532A OF OR V 5220Q FOR MONITOR SWITCH TYPE NO SZM V16 FA 63 OR VP 533A OF OR V 5230Q 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 INVERTER MODULE 2 ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD 1 LITER OF WATER IN CONTAINER IN THE OVEN A TEST PROCEDURES COMPONENTS TEST PROCEDURE RESULTS INVERTER Lead wires removed CN702 Heat Sink 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 resi
12. 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 and sensor CN5 wire leads RY2 CN2 CN4 from the circuit board Control Panel Circuit Board 4 Remove 3 screws securing the circuit board Circuit Board Figure 2 5 Remove the FPC connector from the terminal socket following HOW TO REMOVE THE CONNECTOR on the next page 6 Remove the circuit board from the control bracket carefully Control Bracket Connector CN3 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
13. 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 Make sure the microwave energy leakage is below the limit of 1mW cm with a 275 ml water load and 5mW cm with a 275 ml water load without the cabinet when measured with a survey meter 7 13 INTERLOCK CONTINUITY TEST A PRIMARY INTERLOCK SWITCH TEST When the door is opened slowly an audible click should be heard the same time or successively at intervals and 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 Whe
14. H DISASSEMBLING DOOR Figure 19 1 Remove the dielectric choke by using knife blade 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 Figure 17 Door Screen Figure 19 7 9 I ASSEMBLING DOOR 1 When mounting the door assembly to the oven 3 Carefully pull the ventilation motor ASS Y out of assembly be sure to adjust the door assembly the microwave oven See Figure 21 b 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 Space M le t Figure 21 b J REMOVING THE VENTILATION MOTOR Remove the mounting plate by loosening mounting plate screws 1 or 2 screws securing it to the back plate See Figure 20 2 Remove MOUNT ALL loosening one screw loosening one screw securing the ventilation Motor and back plate See Figure 21 a Mount All Figure 21 a 7 10 K REMOVING THE TURNTABLE MOTOR 1 Remove the glass tray and rotating ring 2 Remove the turntable shaft VERY CAREFULLY with a hand Figure 22 3 Remove the base plate by removing 8 screws securing it to the oven cavity Figure 23 4 Disconnect the leadwire from the turntable motor terminals b Remove the 1 sc
15. 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 19 P 4 187 Mw T2 T1 0 55Mc T2 TO t is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included about 5 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 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 TO 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 t is 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
16. latch board and the switches as shown in Figure 25 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 25 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 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 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 Secondary 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 Interlock Switch Interlock Monitor Switch Adjust the latch board until the switches operate in this sequence See Steps 3 and 4
17. replacements and check microwave energy leakage according to ADJUSTMENT PROCEDURES on page 7 12 Latch Board Figure 9 7 7 i Figure 10 WIRE COLOR SYMBOL COLOR WH WHITE BK BLACK BR__ BROWN RD RED YL YELLOW PK PINK BL BLUE GY GREY GN GREEN N P Not Provided Latch Board Primary Interlock Switch Interlock Monitor Switch Secondary Interlock Switch REMOVING MAGNETRON Figures 11 Through 12 1 Remove the vent grille by loosening two screws Figure 11 2 Remove the outcase See page 7 6 3 Remove four tap tite screws securing the magnetron to the wave guide 4 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 cm2 All service adjustments should be made for minimum microwave energy leakage readings Figure 12 E REMOVING THE INVERTER MODULE Figures 13 Through 15 1 Remove the vent grille by loosening two screws Figure 11 2 Remove the outcase See page 7 6 3 Remove the base plate by loosening four screws F
18. several ohms A B 76 ohms B C 22 ohms A C 96 ohms TURNTABLE MOTOR Wire leads removed Measure the resistance Ohm meter scale R x 1000 8 Normal 2 4 Abnormal Infinite or several ohms STIRRER MOTOR Wire leads removed Measure the resistance Ohm meter scale Rx100 Normal Approx 125 to 135 ohms Abnormal Infinite or several ohms RELAY2 Check for continuity of relay 2 with an ohm meter Remove wire leads from relay 2 and operate the unit Normal ON 0 ohm OFF Infinite ohms Abnormal Infinite or several ohms 7 17 KEY MATRIX AUTO AUTO ADD AUTO KITCHEN COOK STOPI 3 PE COMPONENTS TEST PROCEDURES RESULTS Measure the resistance between terminal When When not pins of connector KEY CONNECTOR Resistance touched touched NOTE value When reconnecting the FPC connector Less 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 CONNECTOR KEY CON l gt For detail matrix circuit of each model refer to page 5 2 4 gt 5 7 gt TOUCH KEY RE 7 a por ESEPES el El 12 eee ie HESSE D 7
19. switch down when switch with door closed 7 25 touching START gt Continuity pad Check the con Continuity Defective PCB Replace PCB nection between assembly assembly CN1 connector and PCB No continuity Loose connection Sones inem assembly tightly 2 Fan motor or Check fan motor gt Abnormal m Defective fan motor Replace fan motor oven lamp do not turn on gt Check oven lamp Abnormal Defective oven lamp gt Replace oven lamp gt Normal Check the Connect them 3 The display connection between No continuity Loose connection tightly shows F 9 magnetron control PCB and inverter Continuit module ontinuity Check the Relay 2 of Replace assembly i Abnormal gt Defective Relay2 assembly Normal Check the Aaa Defective inverter Replace inverter inverter module module module Normal Check the Defective Replace gt gt gt Magnetron Magnetron Magnetron Normal sani Suggest customer eck the power Unsafe AC input contact local el
20. the wave guide and cavity Never operate the magnetron unless it is properly installed 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 MODEL 721 63682 721 63683 721 63684 721 63689 TABLE OF CONTENTS Page SAFETY PRECAUTIONS ni fe Inside front page SPECIFICATIONS 2 ausu tton lea n aut 1 1 CAUTIONS P 2 1 INSTALLATIONS vcs tici t e teet eti de ettet e eq ee tetto tete inde 3 1 OPERATING INSTRUCTIONS 22 en nenne 4 1 CONTROL PANEL tate 4 1 CONTROL PANEL INSTRUCTIONS nein tenent nennen tnnt nnn rnnt nen nennen 4 2 OVERALE CIRCUIT DIAGRAM epatis o 5 1 SCHEMATIC DIAGRAM erreur reisen 5 1 MATRIX CIRCUIT FOR TOUCH KEY BOARD i 5 2 GENERAL INFORMATION FOR SERVICE sse nenne 6 1 GENERAL PRE
21. 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 releasing the fingers Figure 7 Plastic fastener Connector Terminal socket Figure 6 Plastic fastener Connector Terminal socket Figure 7 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 two screws 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 5 Remove four screws of the rear cavity 6 Remove the outcase with disconnecting power cord connector Mount All Power code Mounting Plate Out Case Vent Grille Controller 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
22. up in your body Micom model only Microwave oven does not work REMEDY Inserting many plugs into one outlet and using them at the same time blown fuse or breaker Avoid using other electrical appliances when you use the microwave oven Microwave oven plug is not inserted tightly Sparks occur Insert microwave oven plug securely 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 Uneven cooking Do not use any type of cookware with metallic trimming Inconsistent intensity of microwave by their characteristics 7 22 1 Use plastic wrap or lid 2 Stir once or twice while cooking soup cocoa or milk etc TROUBLE 1 The following visual conditions indicate a probable defective control circuit 1 Incomplete segments Segment missing Partial segment missing Digit flickering NOTE Slight flickering is normal different from one touched Random programming when touching other pads Display is fixed at some figure and can not accept any input
23. 18 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 THE WIRES B 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 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 Ifthe 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 PROBLEM Oven lamp turns on without touching START key
24. CAUTIONS IN USE i 6 1 Ms Mongolie 6 1 FEATURES AND SPECIFICATIONS FEATURES ener entrent nnns 6 1 SERVICE INFORMATION teret eet LC e d tho n Ee det ed v e Hee 7 1 PRECAUTIONS AND REPAIR SERVICE i 7 1 MICROWAVE LEAKAGE TEST iii 7 2 POWER OUTPUT MEASUREMENT iii 7 3 DISASSEMBLY INSTRUCTIONS 7 4 INTERLOCK SYSTEM a Heil 7 12 INTERLOCK CONTINUITY TEST 7 14 TEST AND CHECKOUT PROCEDURES AND 7 15 A TEST PROCEDURES ehi ee nel 7 15 B GHECKOUT PROCEDURE ertt ete adis 7 19 C TROUBLESHOOT ING iiiter t ure ee et Mn ese o Ee pude 7 22 EXPLODED VIEW etn ane edam abeft redire dote ras 8 1 REPLACEMENT PARTS LIST 4 2 2 aa iin 8 8 SCHEMATIC DIAGRAM OF 8 16 PRINTED CIRCUIT BOARD eret eta end 8 17 PCEBIPARTS LIST 8 18 SPECIHCATIONS Rated Power Consumption 1400W maximum Microwave oven Cook top lamps Ventilation fan Microwave Output eee 1200W IEC 60705 Frequency ooo ttt 2 450 MHz
25. CAUTIONS 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 asmall amount of food be sure to put a glass of water into the cooking compartment The glass turntable may become hot after operating be careful when touching it B 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 ofthe oven TRIAL OPERATION After installation the following sequences and results should be checked carefully A Put a container filled with water about 1 liter into the oven and close the door tightly B Set cooking time for 10 minutes by touching 1 and then 0 three times 1 0 0 0 appears the display window C 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 D 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 E Continue operating the unit Two short and a long beep sound signal is heard when the time is up The uni
26. CING 1 Before the power is applied a Make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by opening and closing the door several by opening and closing the door several times Make sure the perforated screen and the dielectric choke of the door are correctly and firmly mounted S 2 After power is applied a Make sure the interlock switch mechanism is operating properly by opening and closing the door 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 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 Make sure that there are no detective parts in the microwave generating and transmission assembly especially waveguide f The following items should be checked after the unit is repaired a The interlock monitor switch is connected correctly and firmly b The magnetron gasket is properly positioned and mounted
27. ED NOTE Use the above switch chart with circuit diagram on page 5 1 NO NO NC CAUTIONS Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from danger in ordinary use extreme care should be taken during repair DO NOT operate on 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 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 assembl
28. EDY Check continuity Malfunction of the 1 Fuse blows Continuity ee 2 gt Replace fuse of monitor monitor switch primary monitor switch with switches and door closed No continuity P C B Assembly Replace fuse Continuity _ Shorted contact at Replace fuse the pri itch i i switch with primary SWIIC primary monitor door opened No continuity switches and P C B Assembly Disconnect one side of the lead wires connected from Inverter Normal Defective control PCB Replace control PCB Fuse blows again gt gt Defective Inverter gt gt Replace Inverter 2 Fuse does not blow Check continuity of thermostat No continuity Continuity Defective thermostat Replace thermostat Check continuity of power supply cord No continuity Defective power supply cord Replace power supply cord 7 24 program times are set and START pad is touched TROUBLE 3 Display shows all figures set but oven does not start cooking while desired CONDITION CHECK RESULT CAUSE REMEDY 1 Setting time Check continuity No continuity Defective Replace does not count of secondary secondary switch secondary
29. JL SEARS T Kenmore f BASIC SERVICE MANUAL FOR MICROWAVE HOOD COMBINATION MODEL 721 63682 721 63683 721 63684 721 63689 FEBRUARY 2003 CAUTION WARNING TO SERVICE TECHNICIANS 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 5 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 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 operation of the microwave ovens requires that tne magnetron be assembled to
30. Model 63683 OVEN CAVITY PARTS For Model 63682 For Model 1 63683 LATCH BOARD PARTS INTERIOR PARTS 1 8 5 INTERIOR PARTS Il 8 6 EV INSTALLATION PARTS 8 7 SCHEMATIC DIAGRAM P C B guy 39 x 1 vz ovemzzes Hl 223 sivasnocssows END 204 0 4000 1uvis 4015 3 89 7 A 8631 ayow 45079 H3NIL 435 2002 Tan NIKLA WOLSND oinv I 82 yor 004 ieu 02404 vzzid ILANIW 1504330 01 104 1v3u3s T 289 t4 83 05 320 5 31934 03345 33080 ua 4005 J3NNIG ANIA 4 3 182 teu
31. akage 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 EQUIPMENT TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday HI 1500 HI 1501 8100 8200 600 cc non conductive material beaker glass plastic inside diameter approx 8 5 cm 31 2 in Glass thermometer 100 C or 212 F 1 deg scale MEASURING MICROWAVE ENERGY LEAKAGE Pour 275 15cc of 20 5 C 68 9 F water 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 5cm 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 Narda Move probe along shaded area C LP B P B Bg g g Probe scanning speed Less than 2 5 cm sec 1 in sec MEASUREMENT WITH THE OUTER CASE REMOVED 1 When y
32. ectric source voltage Abnormal voltage power utility co or qualified electrician CONDITION CHECK RESULT CAUSE REMEDY Connect them 4 The display 3 Check the Abnormal Loose connection gt tightly shows F 4 connection between sensor wire and control PCB Normal Check the sensor Abnormal Defective sensor Replace sensor Defective Control Replace PCB Normal PCB assembly assembly TROUBLE 4 Oven seems to be operating but little heat is produced in oven load CONDITION CHECK RESULT CAUSE REMEDY 1 Lower than 90 of Decrease in power Suggest customer Output is low Check the rating voltage source voltage contact local with load electric power gt 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 7 26 EXPLODED VIEW DOOR PARTS Model 721 63682 721 63683 721 63684 721 63689 f CONTROLLER PARTS 63682 63684 For Model 63689 For
33. ed 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 FILAMENT TERMINALS MAGNETRON CHASSIS GROUND MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL INSTALLATIONS 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 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 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 t
34. efore 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 AT of 10 1 is measured where t is the time in seconds and AT is the temperature rise 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 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 3 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 4 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 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
35. he power cord plug 3 1 OPERATING INSIRUCTIONS CONTROL PANEL Smart Touch Sensor 2 gt 3 PIZZA VEGETABLE POTATO 6 SIMMER T 1 2 4 5 6 7 8 9 fo ME POWER 4 43 Oe Mitte s More dd STOP START CLEAR AUTO AUTO REHEAT WARM 19 atta EXPRESS 2 CLOCK DEFROST Derrost 22 KITCHEN MELT SOFTEN 5 TIMER 5 SPEED LIGHT VENT HIGH NIGHT OFF ON OFF DO 8554 4 1 CONTROL PANEL INSTRUCTIONS 1 Display The display includes a clock and indicators to tell you time of day cooking time settings cook powers quantities weights and cooking functions selected 2 Popcorn Touch this pad to pop popcorn with the sensor feature The 5 sensor will tell the oven how long to cook depending on the amount of humidity it detects from the popcorn 3 Pizza Touch this pad to reheat one or several slices of pizza without entering a cook time or power 4 Vegetable Touch this pad to cook without entering a cook time or power 5 Potato Touch this pad to cook potatoes without entering a cook time or power 6 Frozen Entree Touch this pad to cook a 10 to 21 ounce frozen entree without entering a cook time or power 7 Dinner Plate Touch this pad to cook without entering a cook time or
36. igure 13 4 Disconnect two leadwire of the fan motor assembly 5 Disconnect the leadwire of the inverter PCB and H V cable of the magnetron Remove the earth wire screw Remove three screws securing to duct assembly and two screws securing to fan guide Figure 14 8 Remove the screw securing to inverter module assembly 9 Push the inverter guide hook and out the inverter module assembly lifting up duct assembly 10 Open the upper inverter guide 11 Remove three screws securing to PCB and pull out PCB Figure 15 2 7 F REMOVING STIRRER FAN G REMOVING DOOR Figure 18 Figures 16 and 17 1 Remove the vent grille by two screws securing it to 1 Remove one rivet ASS Y securing it to the oven the outcase loosening upper plate by using knife blade 2 Lift up and draw the door 2 Pull out the stirrer fan cover 3 Remove two rivets ASS Y securiting it to the oven upper plate by using knife blade 4 Remove the stirrer fan NOTES 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 energy leakage with a survey meter Microwave energy leakage must be below the limit of 5mW cm With a 275 ml water load Figure 16 Figure 18
37. n 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 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 it is necessary to do this continuity test before operating the oven RESULTS SWITCHES Wire leads removed Check for continuity of the switch with an Ohm meter Door open Primary Switch en Monitor Switch Secondary Switch pom NOTE
38. ou 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 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 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 cm2 19 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 3 The oven and the empty vessel are at ambient 0 prior to the start of the test 4 The initial temperature T1 of the water is 10 1 C 50 F It is measured immediately b
39. power 8 Sure Simmer Touch this pad to simmer soups casseroles stews and other liquid foods 9 Number Pads Touch number pads to enter cooking times cook powers quantities weights or food categories 10 Cook Time Touch this pad followed by Number Pads to set a cooking time Power Touch this pad after the cook time has been set followed by a Number Pad to set the amount of microwave energy released to cook the food The higher the number the higher the microwave power or cooking speed Add Minute Touch this pad to cook for 1 minute at 100 cook power or to add extra minutes at the set cook power to your cooking cycle Less Touch this pad to subtract 10 seconds of cook time each time you press it 14 More Touch this pad to add 10 seconds of cook time each time you press it 11 12 13 15 Start Touch this pad to start a function If you open the door after the oven begins to cook retouch Start 16 Stop Clear Touch this pad to erase an incorrect command cancel a program during cooking or to clear the Display 17 Auto Cook Touch this pad to cook microwavable foods without entering a cook time or power 18 Auto Reheat Touch this pad to reheat microwavable foods without entering a cook time or power 19 Hold Warm Touch this pad to keep hot cooked foods safely warm in your oven for up to 99 minutes 99 seconds Hold Warm can be used by itself or it can automatically follow a cooking c
40. rews securing the turntable motor to the oven cavity ASS Y Figure 24 NOTES Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connector not the wires when removing 7 Wire Leads YY Turntable Motor Figure 24 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 COM 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 Mounting of the primary monitor secondary switches to the latch board Latch Board Primary Interlock Switch Interlock Monitor Switch Secondary Interlock Switch Figure 25 a LATCH 0 1 64 Figure 25 b LATCH BOARD 0 1 64 7 12 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
41. se 594 82 s 3 8035 84 HOLIMS YOLINON o YOLOW dWiv140 Di002 HOLIMS 208834 1 N ABYONODIS 1211 5 0 B x E AX 2 asimi Den 55 0 TE si ax vey 9 ur wn E 90 12115570 ceo AZIOWIOr FR EXE ut Ed 5 79 m 77 5 ged 4 22297 591 721 55 0 05 Ly mul er A E y SE 09 2024 5 moo 21 b 10H 500 t 55 587 sec 35 QUNI a Kurze IND AVISOWY3HL ZHO9 OV 8 16
42. ss than 0 5 A there is no input to the inverter 2 The start function fails to operate but the high voltage Systems 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 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 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 C 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 to your meter panel CONDITION 1 Check grounding before checking for trouble 2 Be careful of the Inverter 3 When checking the continuity of the switches or the inverter disconnect lead wires from these parts and then check continuity with the AC plug removed To do otherwise may result in a false reading or damage CAUSE 4 Do not touch any part of the circuit on the PCB since static electric discharge may damage this control Always touch yourself to ground while working on this panel to discharge any static charge built
43. stance Ohm meter scale Rx1 Filament terminal 2 Measure the resistance Ohm meter scale Rx1000 Filament to chassis Normal Less than 1 ohm Normal Infinite 7 15 COMPONENTS TEST PROCEDURE RESULTS Filament NOTE When testing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition SENSOR 1 Disconnect sensor connector from micom computer board 2 Measure resistance terminal to terminal Select the ohm scale on the meter so W BK E NOTE 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 Eom BK RD 5 Koh d RD WH 2 8 conn BK WH 2 8 Kohms 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 7 16 COMPONENTS TEST PROCEDURE RESULTS FAN MOTOR Wire leads removed Measure the resistance Ohm meter scale R x 100 B BK Normal Approx 50 150 ohms Abnormal Infinite or
44. t will shut off automatically F Confirm the water is hot G 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 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 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 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 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 defective in high voltage section TO AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY LEAKAGE THE FOLLOWING PRECAUTIONS MUST BE TAKEN BEFORE SERVI
45. ycle 20 Clock Touch this pad to enter the time of day 21 Auto Defrost Touch this pad followed by Number Pads to thaw frozen meat by weight Express Defrost Touch this pad to express defrost GROUND BEEF 1 0 LBS TOUCH START will appear in the display Kitchen Timer Touch this pad to set the Kitchen Timer Melt Touch this pad to melt chocolate cheese butter or marshmallows 25 Soften Touch this pad to soften ice cream cream cheese butter or frozen juice 26 Vent On Off Touch this button to turn the fan on or off 27 Vent 5 Speed Touch this button to choose one of 5 fan speeds 28 Light High Night Off Touch this button to turn the light on high night or off 22 23 24 NOTE If you try to enter incorrect instructions you will not hear any tones Touch STOP CLEAR and re enter the instructions OVERALL CIRC UIT DIAGRAM SCHEMATIC DIAGRAM
Download Pdf Manuals
Related Search