Kenmore 721.63663 User Manual Download

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BASIC SERVICE MANUAL

MODEL 721. 63662

FEBRUARY, 2003

FOR

MICROWAVE HOOD COMBINATION

TECHNICAL FLASH

721. 63663
721. 63664
721. 63669

Summary of Contents for 721.63663

Page 1: ...BASIC SERVICE MANUAL MODEL 721 63662 FEBRUARY 2003 FOR MICROWAVE HOOD COMBINATION TECHNICAL FLASH R 721 63663 721 63664 721 63669 ...

Page 2: ...roper 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 ea...

Page 3: ... FOR TOUCH KEY BOARD 5 2 GENERAL INFORMATION FOR SERVICE 6 1 GENERAL PRECAUTIONS IN USE 6 1 TRIAL OPERATION 6 1 FEATURES AND SPECIFICATIONS FEATURES 6 1 SERVICE INFORMATION 7 1 PRECAUTIONS AND REPAIR SERVICE TIPS 7 1 MICROWAVE LEAKAGE TEST 7 2 POWER OUTPUT MEASUREMENT 7 3 DISASSEMBLY INSTRUCTIONS 7 4 INTERLOCK SYSTEM 7 11 INTERLOCK CONTINUITY TEST 7 13 TEST AND CHECKOUT PROCEDURES AND TROUBLESHOOT...

Page 4: ...er P1 1019 120 V Magnetron 2M261 Cook top Lamp 120 V 20 W Halogen Cavity Lamp 125 V 20 W Halogen Timer Digital up to 99 min 99 sec in each cooking stage Tray Tempered Safety Glass Overall Dimensions 2915 16 W x167 16 H x153 8 D Oven Cavity Size 231 2 W x103 16 H x141 2 D Effective Capacity of Oven Cavity 2 0 Cu ft Accessories Owner s Manual Cooking Guide Installation Manual Exhaust Adapter Exhaust...

Page 5: ... 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 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 THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIE...

Page 6: ...ounded 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 BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY WARNING Improper use of the grounding plug can result in a risk of electric shock Do not under any circumstances cut or remove the thir...

Page 7: ...owave oven control panel lets you select the desired cooking function quickly and easily All you have to do is touch the necessary Command Button The following is a list of all the Command and Number Buttons located on the control panel For more information on these features see the Using your microwave oven section ...

Page 8: ... Warm can be used by itself or it can automatically follow a cooking cycle 13 Add Minute Touch this button to cook for 1 minute at 100 cook power or to add extra minutes at the set cook power to your cooking cycle 14 More Touch this button to add 10 seconds of cook time each time you press it 15 Less Touch this button to subtract 10 seconds of cook time each time you press it 16 Clock Touch this b...

Page 9: ...5 1 SCHEMATIC DIAGRAM OVERALL CIRCUIT DIAGRAM ...

Page 10: ...5 2 MATRIX CIRCUIT FOR TOUCH KEY BOARD ...

Page 11: ... 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 unit will shut off automatically F Confirm the wat...

Page 12: ...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 e...

Page 13: ...sity 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 EQUIPMENT TESTER VOLTS DC AC Ohmmeter M...

Page 14: ...ve been used 3 At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer 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 max...

Page 15: ...ING 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 4 Remove 3 screws securing the circuit board 5 Remove the circuit board from the control bracket carefully 7 4 Figure 2 Circuit Board C...

Page 16: ... 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 Vent Grille Door Mount All Mounting Plate Out Case Controller Power code...

Page 17: ...7 11 Latch Board Secondary Interlock Switch Interlock Monitor Switch Interlock Switch Primary Latch Board WH from Inverter YL from Turntable Motor PK from Cooktop lamp BL from Oven Thermostat Secondary Interlock Switch Monitor Interlock Switch Primary Interlock Switch PK from P C B BL from P C B WH from Inverter RD from Inverter Figure 9 Figure 10 WIRE COLOR SYMBOL COLOR WH BK BR RD BL PK GY N P W...

Page 18: ...rvice adjustments should be made for minimum microwave energy leakage readings 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 5 3 Remove the base plate by loosening four screws Figure 13 4 Disconnect two leadwire of the fan motor assembly 5 Disconnect the leadwire of the inverter PCB and H V cable of t...

Page 19: ...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 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 norm...

Page 20: ...ves may leak from the clearance between the door and the oven J REMOVING THE VENTILATION MOTOR 1 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 3 Carefully pull the ventilation motor ASS Y out of the microwa...

Page 21: ...crews securing it to the oven cavity Figure 23 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the 1 screws 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 Wire Leads Turntable Motor Figure 24 Figure 22 Figure 23 7 10 ...

Page 22: ...justment 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...

Page 23: ...ro 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 prope...

Page 24: ...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 shoul...

Page 25: ...removed MAGNETRON Lead wires removed 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 1 Measure the resistance Oh...

Page 26: ...e dry 4 The oven will not generate microwave energy for the first 28 seconds of the sensor cooking cycle 1 Disconnect sensor connector from micom computer board 2 Measure resistance terminal to terminal Select the ohm scale on the meter 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 NOTE When testin...

Page 27: ...0 150 ohms Abnormal Infinite or several ohms A B 76 ohms B C 22 ohms A C 96 ohms Normal Approx 2 4K ohms Abnormal Infinite or several ohms A RD B BK C WH Relay 2 Normal Approx 125 to 135 ohms Abnormal Infinite or several ohms Normal ON 0 ohm OFF Infinite ohms Abnormal Infinite or several ohms Measure the resistance Ohm meter scale Rx100 RELAY2 Check for continuity of relay 2 with an ohm meter Remo...

Page 28: ...is touched Improper operation of the primary interlock secondary interlock switches and or the interlock monitor switch Malfunction of the high voltage transformer the high voltage capacitor including the diode the magnetron the blower motor or the circuit board PROBLEMS CAUSES NOTES If the fuse is blown by an improper switch operation replace all switches and the fuse at the same time After repla...

Page 29: ...eplace the circuit board Defective FAN motor Defective Wire Assembly Replace FAN motor NO NO YES YES NO NO YES YES GOOD PROBLEM A Oven lamp turns on without touching START key when the door is closed Remove the mate connector of I O CON from the circuit board Does the unit still operate GOOD Replace the circuit board Replace Wire Assembly PROBLEM B Oven lamp turns on When the door is closed and ST...

Page 30: ...put current is less 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...

Page 31: ...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 does not work Inserting many plugs into one outlet and using them at the same time blown fuse or breaker Microwave oven plug is not inserted tightly Using metallic ware and allowing it to touch the oven wall Sparks occur Inconsiste...

Page 32: ... after setting cooking cycle 11 Display time of day does not reappear when cooking is finished TROUBLE 1 The following visual conditions indicate a probable defective control circuit CONDITION CHECK RESULT CAUSE REMEDY 1 No input can be programmed Continuity No continuity Defective door PCB assembly Loose connection Replace door PCB assembly Connect them tightly Check the conn ection between membr...

Page 33: ... fuse primary monitor switches and P C B Assembly Check continuity of monitor switch with door closed Check continuity of primary switch with door opened Disconnect one side of the lead wires connected from Inverter Replace fuse 2 Fuse does not blow No continuity Continuity No continuity Defective power supply cord Replace power supply cord Defective thermostat Replace thermostat Check continuity ...

Page 34: ...een CN1 connector and control PCB assembly TROUBLE 3 Display shows all figures set but oven does not start cooking while desired program times are set and START pad is touched 3 The display shows F 9 No continuity Continuity Loose connection Connect them tightly Check the connection between magnetron door control PCB and inverter module Abnormal Normal Defective Relay2 Replace control PCB assembly...

Page 35: ...Normal Defective Magnetron Replace Magnetron Decrease in power source voltage with load Suggest customer contact local electric power utility co or qualified electrician Check the power source voltage CONDITION CHECK RESULT CAUSE REMEDY 4 The display shows F 4 Abnormal Normal Loose connection Connect them tightly Check the connection between sensor wire and control PCB Abnormal Normal Defective se...

Page 36: ...8 1 EXPLODED VIEW DOOR PARTS 1004 W171 1000 1005 1008 1003 W109 W109 1011 1015 1007 1006 1009 1381 FOR 63663 ONLY MODEL 721 63662 721 63663 721 63664 721 63669 EV ...

Page 37: ...8 2 CONTROLLER PARTS I 1001 W106 W106 2016 2009 2007 2017 EV ...

Page 38: ...8 3 CONTROLLER PARTS II 2004 2008 2002 2006 W106 2381 FOR 63663 ONLY EV ...

Page 39: ...Y PARTS For Model 63662 63664 W121 W138 W107 3024 3029 3030 3003 3036 3018 3033 W149 5036 3026 3028 W149 3032 6000 W150 3005 3001 W109 3031 3010 W142 W138 W138 W142 W142 For Model 63662 63664 For Model 63663 63669 EV ...

Page 40: ...8 5 LATCHBOARDPARTS 4000 W111 4001 4002 4003 4002 4004 EV ...

Page 41: ...8 6 INTERIORPARTS I 3002 5026 5049 5025 5003 5057 5012 5009 5052 5000 3007 5044 3009 W105 3004 5035 3008 3017 W109 W109 W109 W109 W101 W109 W109 W109 W109 W130 W146 W101 5066 5048 5024 3054 EV ...

Page 42: ...8 7 INTERIOR PARTS II 5011 3027 5001 5016 5056 WTT024 5029 5006 5014 5010 5064 5065 W144 W150 W150 5027 W109 5019 5041 5045 5015 5037 EV ...

Page 43: ...8 8 INSTALLATION PARTS 6008 6009 6011 6010 EV ...

Page 44: ...P NO 3828W5S2630 Printed in Korea ...

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