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Kenmore 721.62622, Service Manual

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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 ..........................................................................................................................................

1-1 

CAUTIONS .....................................................................................................................................................

2-1 

INSTALLATIONS ............................................................................................................................................

3-1 

OPERATING INSTRUCTIONS.......................................................................................................................

4-1 

CONTROL PANEL .................................................................................................................................

4-1 

CONTROL PANEL INSTRUCTIONS .....................................................................................................

4-2 

OVERALL CIRCUIT DIAGRAM ......................................................................................................................

5-1 

SCHEMATIC DIAGRAM.........................................................................................................................

5-1 

MATRIX CIRCUIT 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  .......................................................................................................................... 7-12

INTERLOCK CONTINUITY TEST .......................................................................................................... 7-14

TEST AND CHECKOUT PROCEDURES AND TROUBLESHOOTING................................................. 7-15

A. TEST PROCEDURES................................................................................................................ 7-15

B. CHECKOUT PROCEDURES..................................................................................................... 7-18

C. TROUBLESHOOTING ............................................................................................................... 7-21

EXPLODED VIEW ..........................................................................................................................................

8-1

Summary of Contents for 721.62622

Page 1: ...BASIC SERVICE MANUAL MODEL JUNE 2002 FOR MICROWAVE HOOD COMBINATION TECHNICAL FLASH R 721 62622 721 62624 721 62629 721 80492 721 80494 721 80499 ...

Page 2: ...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 UL CSA Standard should be performed on each oven prio...

Page 3: ...CTIONS 4 2 OVERALL CIRCUIT DIAGRAM 5 1 SCHEMATIC DIAGRAM 5 1 MATRIX CIRCUIT 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 12 I...

Page 4: ... at 90 C 5 C Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Switch Magnetron 2M214 161GP High Voltage Capacitor Capacitor 1 0µF 2 1 KV AC High Voltage Diode Diode 350mA 9 0 KV Cook top Lamp 125 V 30 W Cavity Lamp 125 V 30 W or 40 W 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 ...

Page 5: ... area 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 Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from...

Page 6: ...d 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 third gro...

Page 7: ...CONTROL PANEL 4 1 OPERATING INSTRUCTIONS 1 2 5 6 8 11 12 14 15 17 20 21 3 4 7 10 13 16 19 22 18 9 ...

Page 8: ...ay 11 Auto Defrost Touch this pad followed by number pads to thaw frozen meat by weight 12 Express Defrost Touch this pad to express defrost GROUND BEEF 1 0 LBS TOUCH START will appear in the display 13 Kitchen Timer Touch this pad to set the kitchen timer 14 Number Pads Touch number pads to enter cooking times cook powers quantities weights or food categories 15 Cook Time Touch this pad followed ...

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

Page 10: ...ook Time 5 0 6 1 7 2 8 3 9 4 N C N C N C N C N C N C Reheat N C LIGHT High Night Off FAN High Low Off N C Express Defrost N C Clock STOP Clear Frozen Entree N C Add Minute N C Auto Defrost Potato Beverage Pizza Kitchen Timer Power START Hold Warm Turntable On Off ...

Page 11: ...ght 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 be...

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 ...

Page 13: ...he microwave oven should not exceed 4 mW cm2 Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage 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 C or 212 F 1 deg scale MEASURING...

Page 14: ...ave 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 ma...

Page 15: ...L 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 and wire leads Relay2 from the circuit board 4 Remove 2 screws securing the circuit board 5 Remove the FPC connector from the...

Page 16: ... 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 3 Lock the level of the plastic fastener into the hook o...

Page 17: ...emove the mounting plate by turning the two screws securing it to the out case 5 Remove the base plate by removing four screws securing it to the out case Remove the Mount All from the out case by removing two screws securing it to the out case 6 Remove four screws from the rear section 7 Remove the outcase with pushing it back Vent Grille Controller Mounting Plate Door Out Case Mount All Power co...

Page 18: ... Secondary Interlock Switch Interlock Monitor Switch Primary Interlock Switch Latch Board WH from H V Transformer WH from Monitor S W PK from Cooktop lamp WH from Oven Thermostat Secondary Interlock Switch Monitor Interlock Switch Primary Interlock Switch YL from P C B GN from P C B WH from Secondary switch YL from Ry2 YL from Turntable Motor Figure 9 Figure 10 WIRE COLOR SYMBOL COLOR WH BK BR RD ...

Page 19: ...it 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 en...

Page 20: ...curing 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 operate 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...

Page 21: ...ed properly microwaves may leak from the clearance between the door and the oven I REMOVING THE VENTILATION FAN ASS Y 1 Remove the mounting plate by removing two screws securing it to the back plate See Figure 16 2 Remove the two screws securing the MOUNT ALL and one screw securing the ventilation fan ASS Y See Figure 17 3 Carefully pull the ventilation motor ASS Y out of the microwave oven See Fi...

Page 22: ...ews securing it to the oven cavity Figure 20 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the 2 screws securing the turntable motor to the oven cavity ASS Y Figure 21 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 21 Figure 19 Figure 20 7 11 ...

Page 23: ...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 24: ...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 25: ...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 26: ... each filament terminal of the magnetron and the chassis ground with an ohm meter on high test scale 1 Measure the resistance With an ohm meter on Rx1 scale a Primary winding b Filament winding c Secondary winding 2 Measure the resistance With an ohm meter on highest scale a Primary winding to ground b Filament winding to ground Normal reading Less than 1 ohm Normal reading Infinite ohms NOTE Repl...

Page 27: ...tinuity 1 Forward Ohm meter Figure 26 a 1 Reverse Ohm meter Figure 26 b Normal reading Momentarily indicates several ohms and then gradually returns to infinite ohms Abnormal reading Indicates continuity or infinite ohms from the beginning Normal readings Infinite Abnormal reading Indicates continuity Normal readings continuity Abnormal reading Infinite Normal readings Infinite Abnormal reading co...

Page 28: ...etween terminal pins of connector KEY CONNECTOR NOTE When reconnecting the FPC connector make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON For detail matrix circuit of each model refer to page 5 2 7 17 COMPONENTS TEST PROCEDURES RESULTS TOUCH KEY BOARD Resistance value When When not touched tou...

Page 29: ...lock 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 POWER LEVEL 1 2 3 4 5 6 7 8 9 10 4 sec 6 sec 8 sec 10 sec 12 sec 14 sec 16 sec 18 sec 20 sec 22 sec 18 sec 16 sec 14 sec 12 sec 10 sec 8 sec 6 sec 4 sec 2 sec 0 NOTES If t...

Page 30: ... Does the unit still operate GOOD Replace the circuit board Replace RELAY1 PROBLEM B Oven lamp turn on When the door is closed and START key is touched Measure the voltage at pin NO 35 of U01 Voltage reading 5 Vdc Replace the circuit board Defective RELAY1 or poor connection of RELAY1 Defective RELAY1 Replace RELAY1 or correct the connection NO NO YES YES NO NO YES YES GOOD ...

Page 31: ...he 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 t...

Page 32: ...7 21 ...

Page 33: ...7 22 ...

Page 34: ...7 23 ...

Page 35: ...7 24 ...

Page 36: ... 8 1 EXPLODED VIEW DOOR PARTS 1005 1003 1008 1009 1007 1006 1011 W109 1000 1002 1004 EV MODEL ...

Page 37: ... 8 2 CONTROLLER PARTS 2004 2381 2002 2000 2008 2006 W106 MBM2 EV ...

Page 38: ...W138 W142 W109 3010 W138 W142 W138 W142 3001 3029 6001 3014 5038 6000 3011 3025 W121 3026 5036 3028 W121 3026 3034 3018 3036 MEZ1 3003 3024 MFL1 MFL3 FOR MODEL FOR MODEL 8 3 OVEN CAVITY PARTS EV ...

Page 39: ... 8 4 4000 4001 4004 W111 4002 4003 4002 LATCH BOARD PARTS EV ...

Page 40: ... 8 5 INTERIOR PARTS I 3002 W101 5009 5008 5035 W101 W101 W105 W108 5034 5002 5018 3009 3037 5000 W108 3012 3008 EV ...

Page 41: ...3027 5015 5045 5037 5038 W109 5006 5010 5001 5016 5005 5014 W101 5007 5044 3004 5043 W108 5337 8 6 INTERIOR PARTS II EV ...

Page 42: ... 8 7 INSTALLATION PARTS 6008 W109 6011 6010 6009 EV ...

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