Sears 721.66292500 Field Manual
  1. Manuals
  2. Brands
  3. Sears Manuals
  4. Microwave Oven
  5. 721.66292500
  6. Field manual
Sears 721.66292500 Field Manual

Sears 721.66292500 Field Manual

Microwave oven and toaster
Hide thumbs
Table of Contents

Advertisement

Quick Links

BASIC FIELD MANUAL
TOASTER AND MICROWAVE OVEN
MODEL 721.66292500
DIVISION 20
FOR
721.66299500
721.66293500
July, 2005
MODEL 721.66292
721.66299
721.66293

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 721.66292500 and is the answer not in the manual?

Questions and answers

Related Manuals for Sears 721.66292500

Summary of Contents for Sears 721.66292500

  • Page 1 MODEL 721.66292 721.66299 721.66293 DIVISION 20 BASIC FIELD MANUAL TOASTER AND MICROWAVE OVEN MODEL 721.66292500 721.66299500 721.66293500 July, 2005...

  • 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

    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. MODEL 721.66292 721.66299 721.66293 MECHANICAL SERVICE INFORMATION TABLE OF CONTENTS 1.

  • Page 4: Adjustment Procedures

    1. ADJUSTMENT PROCEDURES ADJUST THE LATCH AND SWITCH CLOSING To avoid possible exposure to microwave energy (3) Loosen the two screws holding the plastic latch board as leakage, adjust the door latches and interlock switches, shown. using the following procedure. (4) With the oven door closed tightly, move the latch board ONLY AUTHORIZED SERVICE PERSONNEL upward toward the top of the oven and/or away from the...
  • Page 5 Latch Board Secondary Interlock Switch Interlock Monitor Switch Primary Interlock Switch LATCH 0-1/64" LATCH BOARD 0-1/64"...

  • Page 6: Precautions On Installation

    2. PRECAUTIONS ON INSTALLATION 4. TRIAL OPERATION (Figure 2) After installation, the following sequences and results A. Plug the power supply cord into a 120 V AC, 60 Hz, should be checked carefully. single-phase power source with a capacity of at least 20 Microwave Oven amperes.

  • Page 7: Features And Specifications

    5. FEATURES AND SPECIFICATIONS Toaster A. The safety systems incorporated in this toaster are: Microwave Oven (1) Toaster door switch A. The safety systems incorporated in this oven are: (2) Toaster thermostat (1) Primary interlock switch (Note : This thermostat located on the air tunnel will (2) Secondary interlock switch open and stop the unit from operation only if a (3) Interlock monitor switch...
  • Page 8 SPECIFICATIONS Rated Power Consumption ........1650W Output Microwave oven ..........1200W (*IEC60705 Rating standard) Adjustable 100W through 1200W, 10 steps Toaster ............... 800W Frequency ............. 2450 MHz ± 50 MHz Power Supply............120V ± 12V AC, 60Hz Rated Current ............13.8 Amp. Magnetron &...

  • Page 9: Overall Circuit Diagram

    6. OVERALL CIRCUIT DIAGRAM A. SCHEMATIC DIAGRAM...
  • Page 10 B. MATRIX CIRCUIT FOR TOUCH KEY BOARD...

  • Page 11: Operating Procedures

    7. OPERATING PROCEDURES A. OVEN CONTROL PANEL MICROWAVE CONTROL AREA 1. DISPLAY. The Display includes a clock and indicators that tell you time of day, cooking time settings, and cooking functions selected. 2. STOP/CLEAR. Touch this pad to stop the oven or clear entries. 3.

  • Page 12: Microwave Oven

    B. EASY USE TABLE TOASTER MICROWAVE OVEN (1) TOAST (1) KITCHEN TIMER 1. Touch STOP/CLEAR. 1. Touch STOP/CLEAR. 2. Touch TOAST. 2. Touch KITCHEN TIMER. 3. Touch Darkness Control (1~9 step) 3. Touch correct number for time. 4. Touch START. 4.

  • Page 13: Procedure For Measuring Microwave Energy Leakage

    8. PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE B. MEASURING MICROWAVE ENERGY LEAKAGE A. CAUTIONS (1) Pour 275±15cc of 20±5°C water in a beaker which is (1) Be sure to check a microwave emission prior to servicing graduated to 600 cc, and place the beaker in the center the oven if the oven is operative prior to servicing.
  • Page 14 D. MEASUREMENT WITH A FULLY ASSEMBLED OVEN G. POWER OUTPUT MEASUREMENT (1) After all components, including the outer panels, are (1) Fill the test beaker with 59°F(15 °C) ~ 75°F(24°C) 1 liter tap fully assembled, measure for microwave energy water. leakage around the door viewing window, the exhaust (2) Stir the water in the beaker with thermometer ( °F or °C) and opening and air inlet openings.

  • Page 15: Disassembly Instructions

    9. DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: UNIT MUST BE DISCONNECTED FROM ELECTRICAL Remove screw OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS, ADJUSTMENTS AND CONTINUITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED. THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE - I.E.
  • Page 16 C. DOOR GROSS ASSEMBLY REMOVAL Remove choke cover (1) Open the door. (2) Remove the choke cover cap very carefully with a flat-blade screwdriver. CAUTION : Be careful not to damage door seal plate by screwdriver. (3) Lift up and push the door. NOTE: 1.
  • Page 17 D. MAGNETRON REMOVAL (Figure 10) E. REMOVING THE TURNTABLE MOTOR (Figure 11) 1) Disconnect the wire lead from the magnetron. 1) Remove the turntable and rotating ring. 2) Carefully remove the mounting screws holding the 2) Lay the unit down on its back. magnetron and the waveguide.
  • Page 18 F. HIGH VOLTAGE TRANSFORMER REMOVAL I. INTERLOCK SYSTEM 1) Discharge the high voltage capacitor. 1) INTERLOCK MECHANISM 2) Disconnect the leadwire from magnetron, high voltage The door lock mechanism is a device which has been transformer, and capacitor. specially designed to eliminate completely microwave 3) Remove the screw holding the high voltage transformer to activity when the door is opened during cooking and thus the baseplate.

  • Page 19: Interlock Continuity Test

    10. 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: Test And Checkout Procedures, And Troubleshooting

    11. TEST AND CHECKOUT PROCEDURES, 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 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 Normal: Approximately 9V 1. Check DC 9V battery before performing CAPACITOR tests.
  • 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 Ω scale on the meter. 2. Place the meter leads across the diode as pictured in Figure 14-a. The reading should be “40M Ω,”...
  • Page 23 COMPONENTS TEST PROCEDURE RESULTS RELAY 2 1. Measure continuity. POWER o. l (Power Relay) 2. Remove the lead wires and operate oven LEVEL at power level 1 through power level 10. 4 sec 18 sec 6 sec 16 sec 8 sec 14 sec 10 sec 12 sec...

  • Page 24: Checkout Procedures

    B. CHECKOUT PROCEDURES (1) CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION: REPLACE BLOWN FUSE WITH 15 AMPERE FUSE. PROBLEMS CAUSES Fuse blows immediately after Improper operation of the primary interlock, the door is closed. secondary interlock switches and/or the interlock monitor switch. Fuse blows immediately after the door is opened.
  • Page 25 (2) CHECKOUT PROCEDURES FOR RELAY. Microwave Oven Toaster - PROBLEM (A) - - PROBLEM (A) - FAN motor and oven lamp turn on without touching FAN motor and indicator light turn on without touching START key when the door is closed. START key when the door is closed.
  • Page 26 (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board. (1) The start function fails to operate but the high (4) Some segments of one or more digits do not light up, or voltage Systems, the interlock switches, the door they continue to light up, or segments light when they sensing and the relay check good.

  • Page 27: Troubleshooting

    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 TOASTER AND MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1.
  • Page 28 (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 29 (TROUBLE 2) Microwave 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 Check continuity Replace fuse, 1. Fuse blows. Continuity. monitor switch. of monitor primary, monitor switch (with switches, and...
  • Page 30 (TROUBLE 3) Display shows all figures set, but microwave oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Replace Defective Check continuity 1.Setting time No continuity. secondary switch. secondary switch.
  • Page 31 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY No microwave Defective PCB Replace PCB Disconnect the No continuity. oscillation. assembly. assembly. wire leads from relay 2 and check continuity Continuity.
  • Page 32 (TROUBLE 6) When toaster operates, strange code can be seen on the display and stop with beep sound. CONDITION CHECK RESULT CAUSE REMEDY Check continuity Defective 1. “F-1” code. No continuity. Replace thermistor of thermistor. thermistor Continuity. Replace toaster Check the Defective heater No continuity.

  • Page 33: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION Model: 721.66292500 721.66299500 721.66293500 SENSOR PARTS OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PLATE PARTS TOASTER PARTS LATCH BOARD PARTS -32-...

  • Page 34: Door Parts

    #EV# DOOR PARTS 1005 1013 1004 1002 1000 1008 1006 1007 W136 2009 1381 For Model 721.66299 1003 721.66292 W109 1009 For Model 721.66299 2000 721.66292 -33-...

  • Page 35: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS W103 3001 3003 3034 For Model W118 721.66292 For Model W107 721.66299 721.66293 3002 3008 3009 W105 -34-...

  • Page 36: Latch Board Parts

    #EV# LATCH BOARD PARTS W102 5015 4002 4003 4000 5006 4002 4004 -35-...

  • Page 37: Interior Parts

    #EV# INTERIOR PARTS 5014 W101 5010 5001 5041 5016 5019 W109 5012 5003 2006 W208 5007 W110 3006 5000 W208 3007 5018 5002 5009 W109 W101 -36-...

  • Page 38: Base Plate Parts

    #EV# BASE PLATE PARTS 5008 6000 6001 6012 6002 W108 W109 W101 W108 -37-...
  • Page 39 #EV# TOASTER PARTS 7038 7029 7024 7027 7036 7026 7040 7039 7028 7010 7011 7382 7381 7009 7000 7008 For Model 7383 721.66293 For Model 721.66293 -38-...

  • Page 40: Part Reference List

    P/NO : 3828W5S5272 Printed in Korea...

This manual is also suitable for:

721.66299500721.66293500Division 20 721.66292500Division 20 721.66299500Division 20 721.66293500

Table of Contents