Sears 721.66312500 Basic Field Manual
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Sears 721.66312500 Basic Field Manual

Sears 721.66312500 Basic Field Manual

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MODEL 721.66312
721.66319
DIVISION 20
BASIC FIELD MANUAL
FOR

MICROWAVE OVEN

MODEL 721.66312500
721.66319500
July, 2005

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Summary of Contents for Sears 721.66312500

  • Page 1: Microwave Oven

    MODEL 721.66312 721.66319 DIVISION 20 BASIC FIELD MANUAL MICROWAVE OVEN MODEL 721.66312500 721.66319500 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 721.66312 721.66319 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 DOOR LATCH INTERLOCK SWITCH MONITOR INTERLOCK SWITCH PRIMARY INTERLOCK SWITCH Figure 1-a LATCH 0-1/64" LATCH BOARD 0-1/64" Figure 1-b...

  • 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 A.

  • Page 7: Specifications

    SPECIFICATIONS Rated Power Consumption ........1650W maximum Output ..............1200W maximum (*IEC 60705 Rating standard) Adjustable 120W through 1200W, 10steps Frequency ............. 2450 MHz ± 50 MHz Power Supply............120V AC, 60Hz Rated Current ............13.8 Amp. Magnetron Cooling ..........Forced Air Cooling Microwave Stirring ..........

  • Page 8: Overall Circuit Diagram

    6. OVERALL CIRCUIT DIAGRAM A. SCHEMATIC DIAGRAM...
  • Page 9 B. MATRIX CIRCUIT FOR TOUCH KEY BOARD Figure 4...

  • Page 10: Operating Procedures

    7. OPERATING PROCEDURES A. OVEN CONTROL PANEL NOTE: A "beep" sounds when you touch a "key" on the control panel, to indicate that you have entered a setting. Figure 5...
  • Page 11 B. PANEL INSTRUCTIONS The entire operation is done by simple touch control pads. 1. DISPLAY. The Display includes a clock and 8. AUTO REHEAT. Touch this pad to reheat food indicators that tell you time of day, cooking time automatically. settings, and cooking functions selected.
  • Page 12 C. EASY USE CHART (1) CLOCK (7) QUICK TOUCH COOKING 1. Touch STOP/CLEAR. 1. Touch STOP/CLEAR. 2. Touch CLOCK. 2. Touch POPCORN. 3. Touch numbers for correct time of day. 4. Touch START. (8) AUTO DEFROST 1. Touch STOP/CLEAR. (2) KITCHEN TIMER 2.

  • 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) opening and air inlet openings.

  • Page 15: Disassembly Instructions

    9. DISASSEMBLY INSTRUCTIONS (7) Pull down and remove the circuit board from the control panel. IMPORTANT NOTES: (8) Remove the F.P.C connector from the terminal socket. UNIT MUST BE DISCONNECTED FROM ELECTRICAL OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS, ADJUSTMENTS AND CONTINUITY CHECKS. WAIT AT Remove screw LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER...
  • Page 16 C. DOOR GROSS ASSEMBLY REMOVAL Remove door assembly (1) Open the door. (2) Life up and draw the door CAUTION : Be careful not to damage door seal plate with the screwdriver. NOTE: 1. After replacing the door, be sure to check that the primary switch, monitor switch, and secondary switch operate normally.
  • Page 17 D. MAGNETRON REMOVAL E. SUCTION GUIDE MAIN ASSEMBLY (1) Disconnect the wire lead from the magnetron. NOTE: To repair any of them, the Suction Guide Main ASS’Y (2) Carefully remove the mounting screws holding the should be removed first. magnetron and the waveguide. (1) Disconnect the wire lead from the capacitor and fan motor.
  • Page 18 F. FAN MOTOR ASSEMBLY REMOVAL NOTE: To repair any of them, the Suction Guide Main ASS’Y should be removed first. (1) Disconnect the wire lead from the fan motor. (2) Remove the fan. (3) Remove the two screws holding the fan motor assembly to the suction guide ass’y.

  • Page 19: Removing Turntable Motor

    I. HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL K. INTERLOCK SYSTEM (1) Discharge the high voltage capacitor. (1) INTERLOCK MECHANISM (2) Disconnect the wire lead from the high voltage capacitor. The door lock mechanism is a device which has been (3) Remove the screw holding the high voltage capacitor specially designed to eliminate completely microwave bracket.

  • Page 20: 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 21: 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 22 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 1. Check DC 9V battery before performing CAPACITOR tests.
  • Page 23 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 1. The reading should be “40M Ω,”...

  • Page 24: Checkout Procedures

    COMPONENTS TEST PROCEDURE RESULTS FAN MOTOR Measure the resistance. Normal: Approx. 65 ~ 80 ohm (Wire leads removed) (Select the Ω scale on the meter) Abnormal: Infinite or several ohm. TURNTABLE Measure the resistance. Normal: Approx. 2 ~ 4K ohm MOTOR (Select the Ω...
  • Page 25 (2) CHECKOUT PROCEDURES FOR RELAY -PROBLEM (A)- FAN motor and oven lamp turn on without touching START key when the door is closed. Remove the mate connector of I/O GOOD CON from the circuit board. Does the unit still operate? Replace the circuit board -PROBLEM (B)-...
  • 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 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) Oven does not operate at all and 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 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. of secondary does not count switch (with...
  • 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: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION Model: 721.66312500 721.66319500 SENSOR PARTS OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS -31-...

  • Page 33: Door Parts

    #EV# DOOR PARTS 1004 1002 1000 1001 1003 1006 1007 1005 -32-...

  • Page 34: Control Panel Parts

    #EV# CONTROL PANEL PARTS 2004 2006 2381 2002 W106 2000 -33-...

  • Page 35: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS W103 3001 3034 For model 721.66312 W118 W107 For model 721.66319 3003 3002 3009 3008 W105 -34-...

  • Page 36: Latch Board Parts

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

  • Page 37: Interior Parts

    #EV# INTERIOR PARTS W101 5014 5010 5001 5041 5016 3006 W102 5012 5003 W208 5007 W110 5000 5002 W101 W109 W208 5040 5018 5009 W101 -36-...

  • Page 38: Part Reference List

    #EV# BASE PLATE PARTS 6001 5008 6000 6007 W101 W108 -37-...
  • Page 39 P/NO : 3828W5S5264 Printed in Korea...

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