Sears 721.60483000 Basic Field Manual
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Sears 721.60483000 Basic Field Manual

Sears 721.60483000 Basic Field Manual

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MODEL 721.60483000
DIVISION 20
BASIC FIELD MANUAL
FOR

MICROWAVE OVEN

MODEL 721.60483000
October, 2000

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Summary of Contents for Sears 721.60483000

  • Page 1: Microwave Oven

    MODEL 721.60483000 DIVISION 20 BASIC FIELD MANUAL MICROWAVE OVEN MODEL 721.60483000 October, 2000...

  • Page 2: Warning To Service Technicians

    MODEL 721.60483000 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

    MODEL 721.60483000 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 721.60483000 MECHANICAL SERVICE INFORMATION TABLE OF CONTENTS 1.

  • Page 4: Adjustment Procedures

    MODEL 721.60483000 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.
  • Page 5 MODEL 721.60483000 LATCH BOARD SECONDARY DOOR LATCH INTERLOCK SWITCH MONITOR INTERLOCK SWITCH DOOR LATCH PRIMARY INTERLOCK SWITCH Figure 1-a LATCH 0-1/64" Figure 1-b LATCH BOARD 0-1/64"...

  • Page 6: Precautions On Installation

    MODEL 721.60483000 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

    MODEL 721.60483000 SPECIFICATIONS Rated Power Consumption ..........1500W maximum Output ................1100W maximum (*IEC 705 Rating standard) ..............Adjustable 100W through 1100W, 11 steps Frequency ..............2,450 MHz ± 50 MHz Power Supply ...............120V ±12V AC, 60Hz Rated Current...............13.0 Amp. Magnetron Cooling............Forced Air Cooling Microwave Stirring............Turntable...

  • Page 8: Overall Circuit Diagram

    MODEL 721.60483000 6. OVERALL CIRCUIT DIAGRAM A. SCHEMATIC DIAGRAM MGT/OVEN AC 120V/60Hz THERMOSTAT SINGLE PHASE ONLY FUSE L.V. TRANSFORMER PRIMARY INTERLOCK SWITCH (NO) OVEN LAMP RELAY 1 MOTOR (CN1) SECONDARY INTERLOCK RELAY 2 SWITCH TURNTABLE MOTOR MONITOR SWITCH (NC) H.V.TRANSFORMER...
  • Page 9 MODEL 721.60483000 B. MATRIX CIRCUIT FOR TOUCH KEY BOARD Figure 4...

  • Page 10: Operating Procedures

    MODEL 721.60483000 7. OPERATING PROCEDURES A. OVEN CONTROL PANEL Display Window- Shows: * Time of day. * Cooking time. * Cooking power level. It also function as a countdown timer when cooking. Sensor Cook Sensor Popcorn Sensor Reheat Quick On...
  • Page 11 MODEL 721.60483000 B. PANEL INSTRUCTIONS The entire operation is done by simple touch control pads. 1. DISPLAY. The Display includes a clock and indicators that 9. QUICK DEFROST. This pad provides you with the quick tell you time of day, cooking time settings, and cooking defrosting method for 1.0 pounds frozen foods.
  • Page 12 MODEL 721.60483000 C. EASY USE CHART (9) USER CHOICE 1. Touch STOP/CLEAR. (1) TIME OF DAY 2. Touch USER CHOICE. 1. Touch STOP/CLEAR. 3. Touch number from 1 to 5 2. Touch TIME OF DAY. Touch 1: SOUND ON/OFF 3. Touch numbers for correct time of day.

  • Page 13: Procedure For Measuring Microwave Energy Leakage

    MODEL 721.60483000 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 ±...
  • Page 14 MODEL 721.60483000 D. MEASUREMENT WITH A FULLY ASSEMBLED OVEN G. POWER OUTPUT MEASUREMENT (1) Fill the test beaker with 59 ˚F(15 ˚C) ~ 75 ˚F(24 ˚C) 1 liter tap (1) After all components, including the outer panels, are water. fully assembled, measure for microwave energy (2) Stir the water in the beaker with thermometer ( ˚F or ˚C) and...

  • Page 15: Disassembly Instructions

    MODEL 721.60483000 9. DISASSEMBLY INSTRUCTIONS (6) Pull down and remove the circuit board from the control panel. IMPORTANT NOTES: (7) 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...
  • Page 16 MODEL 721.60483000 C. DOOR GROSS ASSEMBLY REMOVAL Remove choke cover (1) Open the door. (2) Remove the choke cover 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.
  • Page 17 MODEL 721.60483000 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.
  • Page 18 MODEL 721.60483000 F. FAN MOTOR ASSEMBLY REMOVAL H. REMOVING SENSOR NOTE: To repair any of them, the Suction Guide Main ASS’Y 1) Disconnect the leadwire from PCB Assembly. should be removed first. 2) Remove a screw securing the sensor duct.

  • Page 19: High Voltage Capacitor And Diode Removal

    MODEL 721.60483000 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...

  • Page 20: Interlock Continuity Test

    MODEL 721.60483000 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

    MODEL 721.60483000 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 MODEL 721.60483000 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.

  • Page 23: Test Procedure

    MODEL 721.60483000 COMPONENTS TEST PROCEDURE RESULTS RELAY 2 Check for continuity of relay 2 with an ohm- POWER meter. LEVEL (Remove wire leads from relay 2 and operate the unit.) 4 sec 18 sec 6 sec 16 sec 8 sec...

  • Page 24: Checkout Procedures

    MODEL 721.60483000 B. CHECKOUT PROCEDURES (1) CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION: REPLACE BLOWN FUSE WITH 20 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.
  • Page 25 MODEL 721.60483000 (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...
  • Page 26 MODEL 721.60483000 (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

    MODEL 721.60483000 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.
  • Page 28 MODEL 721.60483000 (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.
  • Page 29 MODEL 721.60483000 (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.
  • Page 30 MODEL 721.60483000 (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 Check continuity 1. Setting time No continuity.
  • Page 31 MODEL 721.60483000 (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: Oven Cavity Parts

    #EV# KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 INTRODUCTION SENSOR PARTS OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS *** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING APPROVED TESTING EQUIPMENT.
  • Page 33 #EV# DRAWING NO: 1 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 DOOR PARTS 15006A 13552A 13536A 13213A 13352A 13551A 14026A 14970A 13581A *** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED...
  • Page 34 #EV# DRAWING NO: 1 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 DOOR PARTS (See Illustration “DOOR PARTS”) N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF THE UNIT.
  • Page 35 #EV# DRAWING NO: 2 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 CONTROLLER PARTS 268711 23551A WTP018 23550D 24510L 24970A 23551B 24781M *** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED...
  • Page 36 #EV# DRAWING NO: 2 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 CONTROL PANEL PARTS (See Illustration “CONTROLLER PARTS”) N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF THE UNIT.
  • Page 37 #EV# DRAWING NO: 3 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 OVEN CAVITY PARTS WTT020 WSZ185 33112U 33461Z 33052M 340511 WTT020 33390G 36549S 35889A WTP013 *** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED BY A...
  • Page 38 #EV# DRAWING NO: 3 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 OVEN CAVITY PARTS (See Illustration “OVEN CAVITY PARTS”) N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF THE UNIT.
  • Page 39 #EV# DRAWING NO: 4 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 LATCH BOARD PARTS WSZ085 56912B WTT028 55262A 466001 43501A 466003 466001 43500A *** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED...
  • Page 40 #EV# DRAWING NO: 4 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 LATCH BOARD PARTS (See Illustration “OVEN CAVITY PARTS”) N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF THE UNIT.
  • Page 41 #EV# DRAWING NO: 5 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 OVEN INTERIOR PARTS WSZ002 568771 56411A 948502 56930V 34930W 56549F WTT028 54974S WSZ196 55900A WTT037 WSZ002 34810M 50CZZH WSZ002 56324A 54810C WTT028 WSZ002 WSZ002 56851D *** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING APPROVED TESTING EQUIPMENT.
  • Page 42 #EV# DRAWING NO: 5 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 OVEN INTERIOR PARTS (See Illustration “LATCH BOARD”) N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF THE UNIT.
  • Page 43 #EV# DRAWING NO: 6 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 BASE PLATE PARTS 63303L 56170D 63302L 63303R 63302R WTT021 948501 65006B WSZ002 65006B WTT021 *** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED...
  • Page 44 #EV# DRAWING NO: 6 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 BASE PLATE PARTS (See Illustration “BASE PLATE PARTS ”) N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF THE UNIT.
  • Page 45 #EV# DRAWING NO: 7 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 SENSOR PARTS WTT021 54974T WTP002 56501A *** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED...
  • Page 46 #EV# DRAWING NO: 7 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 SENSOR PARTS (See Illustration “SENSOR PARTS ”) N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF THE UNIT.
  • Page 47 DRAWING NO: 11 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 POWER AND CONTROL CIRCUIT BOARD COMPONENT SIDE SOLDER SIDE October, 2000 -16-...
  • Page 48 DRAWING NO: 11 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 POWER AND CONTROL CIRCUIT BOARD (See Illustration “POWER AND CONTROL CIRCUIT BOARD”) N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF THE UNIT.
  • Page 49 DRAWING NO: 11 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 SCHEMATIC DIAGRAM OF P.C.B October, 2000 -18-...
  • Page 50 DRAWING NO: 11 KENMORE MICROWAVE OVEN MODEL NO. 721.60483000 SCHEMATIC DIAGRAM OF P.C.B (See Illustration “SCHEMATIC DIAGRAM OF P.C.B”) N.S.P (NOT SERVICE PART): THESE PARTS ARE NOT AVAILABLE AS REPAIR PARTS BECAUSE THEY ARE TOO COSTLY OR NOT PRACTICAL TO REPLACE OR NEVER EXPECTED TO FAIL DURING THE LIFE EXPECTANCY OF THE UNIT.
  • Page 51 P/NO: 3828W5S1706...

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