Related Manuals for Sears 721.67902600
Summary of Contents for Sears 721.67902600
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Page 1: Microwave Oven
MODEL 721.67902 721.67903 721.67909 DIVISION 20 BASIC FIELD MANUAL MICROWAVE OVEN MODEL 721.67902600 721.67903600 721.67909600 JUNE, 2006... -
Page 2: Warning To Service Technicians
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;... -
Page 3: Table Of Contents
CONTENTS MODEL 721.67902 721.67903 721.67909 (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1... -
Page 4: Specifications
SPECIFICATIONS Rated Power Consumption - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1500W Output Microwave - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1000W (*IEC60705 Rating standard) Adjustable 100W through 1000W, 10 steps Convection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1500W... -
Page 5: Cautions
CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connected. -
Page 6: Installations
INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING GROUNDING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with For personal safety, this appliance must be fully a soft, damp cloth. Check for damage such as grounded at all times. -
Page 7: Operating Instructions
OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Metal Rack Display Window Control Panel Glass Tray Safety Interlock Rotating Ring System CONTROL PANEL 1. DISPLAY. The Display includes a clock and indicators to tell you time of day, cooking time settings and cooking functions selected. -
Page 8: Operating Sequence
OPERATING SEQUENCE The following is a description of component functions during oven operation. 1. SETTING THE CLOCK 6. MORE / LESS • The More and Less functions will adjust the cook Stop/ Enter time Clock Start/Pause time of many oven functions. Clear of day •... - Page 9 OPERATING SEQUENCE 11. EXPRESS DEFROST 9. SENSOR TOUCH COOKING • Sensor cook and reheat Stop/ Express Select Food Clear Defrost Category Stop/ Select Sensor Sensor Cook Clear menu Start/Pause Sensor Reheat 12. AUTO BAKE/ROAST • Sensor Popcorn Stop/ Stop/ Popcorn Auto Bake Food Category Clear...
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Page 10: Schematic Diagram
SCHEMATIC DIAGRAM NOTE: 1. DOOR IS OPENED. 2. WIRE COLOR. SYMBOL COLOR BROWN WHITE BLACK BLUE YELLOW PINK GREEN... -
Page 11: Circuit Description
CIRCUIT DESCRIPTION GENERAL DETAILS WHEN THE DOOR IS OPENED DURING COOKING • The low voltage transformer supplies the necessary voltage to the micom controller when power cord is • Both the primary switch and relay 2 cut off the primary plugged in. -
Page 12: Service Information
SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. • TESTER (VOLTS-DC, AC, Ohm meter) Tools needed for service are listed below. • Microwave survey meter • Diagonal pliers - Holaday HI-1500 •... -
Page 13: Record Keeping And Notification After Measurement
MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • The test probe must be removed no faster than • When you replace the magnetron, measure for 1 inches/sec (2.5 cm/sec) along the shaded area, microwave energy leakage around the door view otherwise a false reading may result. -
Page 14: Measurement Of Microwave Power Output
MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with the • The microwave power output P in watts is calculated microwave oven supplied at its rated voltage and from the following formula: operated at its maximum microwave power setting with a load of (1000 ±... - Page 15 D. P.C.B ASSEMBLY REMOVAL Remove choke cover 1) Remove the control panel assembly from the cavity. (Refer to control panel assembly removal on previous page.) 2) Remove screws which hold the P.C.B. SUB Assembly to the control panel. 3) Pull P.C.B. SUB Assembly carefully from the control panel.
- Page 16 F. AIR DUCT ASSEMBLY / REMOVAL G. MAGNETRON REMOVAL 1) Disconnect the leadwires from the lamp, micro 1) Remove the mounting screw holding the magnetron switch, damper motor, and damper switch. and air duct assembly. 2) Remove the screws holding the oven cavity and 2) Disconnect the leadwire from the magnetron.
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Page 17: Diode Removal
H. THE TURNTABLE MOTOR I. HIGH VOLTAGE TRANSFORMER REMOVAL REMOVAL 1) Remove the turntable and rotating ring. 1) Discharge the high voltage capacitor. 2) Lay the unit on its back. 2) Disconnect the leadwire from magnetron, and high 3) Remove the turntable motor cover. voltage capacitor. - Page 18 L. INTERLOCK SYSTEM M. C-MOTOR, THERMISTOR AND SHEATH HEATER REMOVAL 1) INTERLOCK MECHANISM The door lock mechanism is a device which has 1) Remove the back cover by removing the four screws been specially designed to stop microwave activity securing the cover assembly to the oven cavity. when the door is opened during cooking and thus 2) Disconnect the leadwire from the circulation motor to prevent the danger resulting from the microwave...
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Page 19: Interlock Continuity Test
INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH A. -
Page 20: Component Test Procedure
COMPONENT TEST PROCEDURE 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 WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. - Page 21 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis 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. HIGH VOLTAGE Measure the resistance. Normal: Momentarily indicates CAPACITOR (Ohm-meter scale: Rx10,000) several ohms, and...
- Page 22 COMPONENTS TEST PROCEDURE RESULTS H.V.Diode (RECTIFIER) STEP 1. Test the diode to see if it is shorted. Procedure: 1. Select the ohm scale on the meter. 2. Place the meter leads across the diode as pictured in Figure 1. The reading should be “40MΩ,”...
- Page 23 COMPONENTS TEST PROCEDURE RESULTS Normal Abnormal FUSE Check for continuity of the switch with a (Wire leads removed.) Multi-meter. NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time.
- Page 24 COMPONENTS TEST PROCEDURE RESULTS CIRCULATION MOTOR Measure the resistance. Normal : Approx. 29.5 ohm (Wire leads removed) (Multi-meter scale : R x 1) Abnormal : Infinite or several ohm. TURNTABLE MOTOR Measure the resistance. Normal : Approx. 3.48 Kohm (Wire leads removed) (Ohm-meter scale : R x 1000) Abnormal : Infinite or several ohm.
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Page 25: Trouble Shooting
TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1. Check grounding before checking for trouble. 2. - Page 26 (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.) 2. Colon does not turn on or blink. 3. A distinct change in the brightness of one or more numbers in display. 4.
- Page 27 (TROUBLE 2) Oven does not operate at all, display window does not display any figures, and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of the Replace fuse, Check continuity 1. Fuse blows. Continuity. monitor switch. primary, monitor, of monitor secondary switch (with...
- Page 28 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Defective Replace 1.Setting time does Check continuity No continuity. secondary switch. secondary switch.
- Page 29 (TROUBLE 5) No microwave oven operation even though oven lamp and fan motor run (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B No microwave Replace P.C.B Disconnect the No continuity. oscillation. assembly assembly wire leads from relay 2 and check continuity Continuity.
- Page 30 (TROUBLE 6) Convection oven does not operate at all or convection cook is bad. CONDITION CHECK RESULT CAUSE REMEDY Defective Relay Replace Relay Convection indicator Check the Relay Abnormal 4 or 6. 4 or 6. light but oven does 4 or 6 of P.C.B. not go into cook assembly .
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Page 31: Exploded View
#EV# EXPLODED VIEW INTRODUCTION MODEL 721.67902600 721.67903600 721.67909600 OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... -
Page 32: Door Parts
#EV# DOOR PARTS For Model: 721.67902 721.67909 1005 1004 1013 1000 1008 1382 W105 1006 1007 1009 For Model: 721.67903 1005 1004 1013 1000 1381 1008 W105 1006 1007 1009... -
Page 33: Controller Parts
#EV# CONTROLLER PARTS For Model: 721.67902 721.67909 2004 2381 2006 2002 2000 W106 For Model: 721.67903 2004 2381 2006 W106... -
Page 34: Oven Cavity Parts
#EV# OVEN CAVITY PARTS 3001 W108 For Model 721.67903 721.67909 W107 For Model 721.67902 W118 W103 W107 W118 W119 3000 3048 3002 3012 3008 3009 W105... -
Page 35: Latch Board Parts
#EV# LATCH BOARD PARTS 4001 4002 4000 4003 4004 W102 W109 4002 W105 5045 5015 5028 3049 5006 4002 W117 W109... -
Page 36: Interior Parts
#EV# INTERIOR PARTS 5019 3013 W108 5010 W121 W101 5401 5021 5413 5402 W121 5403 5405 5407 3207 5404 3006 3206 W177 5408 W121 W141 W123 W108 W125 W182 5001 W124 W132 5406 5041 3036 3208 W146 W102 5003 5012 5007 W101 5000... -
Page 37: Base Plate Parts
#EV# BASE PLATE PARTS 5008 6001 6000 W108 6007 6017 W101... - Page 38 #EV# SENSOR PARTS W104 5011 W108 5004 5016...
- Page 39 P/NO : MFL06275102...
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Questions and answers
Where is the light bulb and how do I replace the light bulb in an older model microwave we have? Lastly, is there a current lightbulb replacement that supports this model? - Model: Kenmore Elite 721.67209600 Thanks for any feedback that you can provide.