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Kenmore 721.62642 Basic Field Manual

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BASIC FIELD MANUAL

MICROWAVE OVEN

MODEL
721.62642400 / 721.80592401 / 721.80592402
721.62649400 / 721.80599401 / 721.80599402
721.62644400 / 721.80594401 / 721.80594402
721.62643400 / 721.80593401 / 721.80593402
DIVISION 22
FOR
March, 2005
MODEL 721.62642 / 721.80592
721.62649 / 721.80599
721.62644 / 721.80594
721.62643 / 721.80593

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  Summary of Contents for Kenmore 721.62642

  • Page 1: Microwave Oven

    MODEL 721.62642 / 721.80592 721.62649 / 721.80599 721.62644 / 721.80594 721.62643 / 721.80593 DIVISION 22 BASIC FIELD MANUAL MICROWAVE OVEN MODEL 721.62642400 / 721.80592401 / 721.80592402 721.62649400 / 721.80599401 / 721.80599402 721.62644400 / 721.80594401 / 721.80594402 721.62643400 / 721.80593401 / 721.80593402...
  • Page 2: Safety Precautions

    CAUTION SAFETY PRECAUTIONS 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

    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 721.62642 / 721.80592 721.62649 / 721.80599 721.62644 / 721.80594 721.62643 / 721.80593...
  • Page 4: Specifications

    SPECIFICATIONS Rated Power Consumption - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1500W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1000W (IEC60705) Adjustable 100W through 1000W, 10 steps Frequency - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2450 MHz ±...
  • 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 connection.
  • Page 6: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. PRECAUTIONS ON INSTALLATION A. Plug the power supply cord into a 120V AC, 60Hz, single-phase power source with a capacity of 15A or 20A. B. Avoid placing the unit in a location where there is direct heat or splashing water.
  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS CONTROL PANEL...
  • Page 8: Control Panel Instructions

    CONTROL PANEL INSTRUCTIONS 1. Display. The display includes a clock and indicators to 16. Express Defrost. Touch this pad to express defrost. tell you time of day, cooking time settings, cook powers, “GROUND BEEF 1.0 LBS TOUCH START” will quantities, weights and cooking functions selected. appear in the display.
  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM (I) *Check the Model No.
  • Page 10: Schematic Diagram (Ii)

    SCHEMATIC DIAGRAM (II) *Check the Model No. (ADD Noise filter) RY11 RY14 HIGH RY15 NIGHT...
  • Page 11: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD...
  • Page 12: General Information For Service

    GENERAL INFORMATION FOR SERVICE GENERAL PRECAUTIONS IN USE FEATURES AND SPECIFICATIONS FEATURES A. Never operate the unit when it is empty. Operating the oven with no load may shorten the A. The safety systems incorporated in this model are: life of the magnetron. Whenever cooking dry foods (1) Primary interlock switch (dried fish, bread, etc.) or a small amount of food, (2) Secondary interlock switch...
  • Page 13: Service Information

    SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY (3) Do not operate the unit until it is completely A. SINCE NEARLY 2,100 VOLTS EXISTS IN SOME repaired, if any of the following conditions exist. CIRCUITS OF THIS UNIT REPAIRS SHOULD BE The unit must not be operated.
  • Page 14: Microwave Leakage Test

    MICROWAVE LEAKAGE TEST CAUTIONS MEASURING MICROWAVE ENERGY LEAKAGE • Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to • Pour 275±15cc of 20±5°C(68±9°F) water in a beaker servicing. which is graduated to 600 cc, and place the beaker •...
  • Page 15: Measurement With The Outer Case Removed

    MEASUREMENT WITH THE OUTER CASE NOTE WHEN MEASURING REMOVED (1) Do not exceed meter full scale deflection. (2) The test probe must be removed no faster than (1) When you replace the magnetron, measure for 1 inch/sec (2.5cm/sec) along the shaded area, microwave energy leakage before the outer case otherwise a false reading may result.
  • Page 16: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: (4) Remove 3 screws securing the circuit board. UNIT MUST BE DISCONNECTED FROM ELEC- TRICAL OUTLET WHEN MAKING REPAIRS, RE- PLACEMENTS, ADJUSTMENTS AND CONTIN- UITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED.
  • Page 17 HOW TO REMOVE THE F.P.C. CONNECTOR HOW TO INSERT THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 4 Follow the steps below as illustrated in Figures 6 and 5 to remove the F.P.C. connector. and 7 to insert the F.P.C. connector. (1) Hold the edges of the plastic fastener with (1) Insert the F.P.C.
  • Page 18 B. REMOVING THE OUT CASE(Figure 8) (1) Remove the vent grille by removing two screws securing it to the out case. (2) Remove two screws securing it to the front bracket. (3) Remove two screws securing it to the air duct. (4) Remove the mounting plate by turning the two screws securing it to the out case.
  • Page 19 C. REMOVING THE DOOR INTERLOCK SWITCHES (Figures 9,10) (1) Disconnect the wire leads from the interlock switches. (2) Remove two screws securing the Latch Board. (3) Make necessary replacements and check microwave energy leakage according to Latch Board “ADJUSTMENT PROCEDURE” on page 7-12. Secondary Interlock Switch Interlock...
  • Page 20 D. REMOVING MAGNETRON NOTES: • When removing the magnetron, make sure that its (Figures 11 Through 13) dome does not hit any adjacent parts, or it may be (1) Remove the vent grille. damaged. (2) Remove mount, all. (3) Remove outcase. •...
  • Page 21 E. REMOVING DOOR (Figure 14) (1) Remove the vent grille by two screws securing it to the outcase loosening. (2) Lift up and draw the door. 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.
  • Page 22 G. ASSEMBLING DOOR (3) Carefully pull the ventilation motor ASS'Y out of the microwave oven. (See Figure 18) (1) When mounting the door assembly to the oven assembly, be sure to adjust the door assembly parallel to the chassis. Also adjust so the door has no play between the inner door surface and oven frame assembly.
  • Page 23 I. REMOVING THE TURNTABLE MOTOR (1) Remove the turntable. (2) Remove the turntable shaft VERY CAREFULLY with a slotted screwdriver. (Figure 19) (3) Remove the base plate by removing eight screws securing it to the oven cavity. (Figure 20) (4) Disconnect the leadwire from the turntable motor terminals.
  • Page 24: Interlock System

    INTERLOCK SYSTEM INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage. ADJUSTMENT PROCEDURES CHECK THE DOOR LATCH AND SWITCH To avoid possible exposure to microwave energy CLOSING.
  • Page 25 TEST THE LATCH AND SWITCH SEQUENCE (5) Open the oven door slowly. Watch the door latch, (7) When you achieve the proper sequence of the Secondary Switch. Release Rod and Lever switches in Steps 5 and 6, tighten the latch board on the switches to make sure they are zero to the screws at that point.
  • Page 26: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST A. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY INTERLOCK SWITCH TEST When the door is opened slowly, an audible click Disconnect the wire lead from the secondary should be heard at the same time or successively switch. at intervals and the latches should activate the Connect the ohmmeter leads to the common switches with an audible click.
  • Page 27: Test And Checkout Procedures And Trouble Shooting

    TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING - CAUTIONS - Filament Winding - DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER Secondary DISCHARGING THE HIGH VOLTAGE CAPACITOR Winding AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE...
  • Page 28 COMPONENTS TEST PROCEDURES RESULTS Measure the resistance: (1) Terminal to terminal Normal reading: Momentarily indicates several ohms, and then gradually returns to infinite ohms. Abnormal reading: Ohm- Indicates continuity or infinite ohms meter from the beginning. Figure 25-a HIGH-VOLTAGE CAPACITOR (2) Terminal to case Normal readings: Infinite.
  • Page 29 COMPONENTS TEST PROCEDURES RESULTS Measure the resistance between terminal When When not pins of connector KEY CONNECTOR. touched touched Resistance NOTE: value Less than More than When reconnecting the FPC connector, 400 ohms 1 mega ohm make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener.
  • Page 30: Checkout Procedures

    COMPONENTS TEST PROCEDURES RESULTS POWER Check for continuity of relay 2 with an LEVEL ohm-meter. (Remove wire leads from relay 2 and 4 sec 18 sec operate the unit.) 6 sec 16 sec Relay 2 8 sec 14 sec 10 sec 12 sec RELAY2 12 sec...
  • Page 31 (2) CHECKOUT PROCEDURES FOR RELAY. - PROBLEM (A) - 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 Defective circuit board RELAY1...
  • Page 32 (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit 6) Wrong figures appear. board. 7) The figures of all digits. 1) The start function fails to operate but the high 8) Some of the indicators do no flicker light up. voltage Systems, the interlock switches, the door 9) The clock does not keep time properly.
  • Page 33 7-21...
  • Page 34 7-22...
  • Page 35 7-23...
  • Page 36 7-24...
  • Page 37: Exploded View

    #EV# EXPLODED VIEW DOOR PARTS Model: 721.62642400 / 721.80592401 / 721.80592402 721.62649400 / 721.80599401 / 721.80599402 721.62644400 / 721.80594401 / 721.80594402 721.62643400 / 721.80593401 / 721.80593402 1005 1004 1002 1000 For 721. 62643 721. 80593 1381 W109 1003 1008 1006 1011 1007 1009...
  • Page 38: Controller Parts

    #EV# CONTROLLER PARTS FOR MODEL: 2004 2006 721.62642 2002 721.62649 721.62644 2000 721.80592 721.80599 721.80594 W106 2008 2381 2004 FOR MODEL: 2006 721.62643 721.80593 W106 2008 2381...
  • Page 39: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS W138 FOR MODEL W142 3010 721. 62642 721. 62644 721. 80592 W109 721. 80594 W138 W142 FOR MODEL 721. 62649 721. 62643 721. 80599 721. 80593 3024 W138 W142 3003 3029 3001 3036 3018 3034 6001 3014 5038 6000...
  • Page 40: Latch Board Parts

    #EV# LATCH BOARD PARTS 4000 4002 W102 4001 4003 4002 4004...
  • Page 41 #EV# INTERIOR PARTS (I) 3002 W101 3012 5009 W108 3008 5008 5035 3037 3009 W101 W105 W108 5018 W101 5002 5034 5000...
  • Page 42 #EV# INTERIOR PARTS (II - I) Model: 721.80592401 Check the rating label of Model and order 721.80599401 SVC parts according to the Model No. 3027 721.80594401 5015 721.80593401 5037 5045 5038 W108 * Check the * Check the W109 Model No. Model No.
  • Page 43 #EV# INTERIOR PARTS (II - II) Model: 721.80592402 Check the rating label of Model and order 721.80599402 SVC parts according to the Model No. 3027 721.80594402 721.80593402 5015 5037 5045 5038 W108 * Check the * Check the W109 Model No. Model No.
  • Page 44 #EV# INSTALLATION PARTS 6008 W109 6011 6010 6009 VINYL...
  • Page 45 P/NO : 3828W5S5158 Printed in Korea...