Kenmore 721. 62622 Service Manual
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Kenmore 721. 62622 Service Manual

Kenmore 721. 62622 Service Manual

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See also: Use and Care Manual , Instruction and Installation Manual
TECHNICAL FLASH
R
BASIC SERVICE MANUAL
FOR
MICROWAVE HOOD COMBINATION
MODEL
721. 62622
721. 62624
721. 62629
721. 80492
721. 80494
721. 80499
JUNE, 2002

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Summary of Contents for Kenmore 721. 62622

  • Page 1 TECHNICAL FLASH BASIC SERVICE MANUAL MICROWAVE HOOD COMBINATION MODEL 721. 62622 721. 62624 721. 62629 721. 80492 721. 80494 721. 80499 JUNE, 2002...

  • 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

    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. TABLE OF CONTENTS (Page) SAFETY PRECAUTIONS ......................Inside front page SPECIFICATIONS............................

  • Page 4: Specifications

    SPECIFICATIONS Rated Power Consumption 1,500W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output 1000W (IEC 60705) Adjustable 100W through 1000W, 10 steps Frequency 2,450 MHz ± 50 MHz Power Supply 120 VAC, 60 Hz Rated Current 13 Amp. (Microwave oven+Cook top lamps+Ventilation fan) Magnetron Cooling Forced Air Cooling Rectification...

  • 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 14. Number Pads. Touch number pads to enter cooking tell you time of day, cooking time settings, cook powers, times, cook powers, quantities, weights, or food quantities, weights and cooking functions selected. categories.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM...

  • Page 10: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD Auto Cook Popcorn High/Low/Off Cook Time LIGHT Auto Reheat Potato High/Night/Off Defrost Kitchen Beverage Clock Minute Timer Express Pizza Power Defrost Turntable Hold STOP START On/Off Warm Clear Frozen Entree...

  • Page 11: General Information For Service

    GENERAL INFORMATION FOR SERVICE FEATURES AND SPECIFICATIONS GENERAL PRECAUTIONS IN USE 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 12: 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 13: Microwave Leakage Test

    MICROWAVE LEAKAGE TEST MEASURING MICROWAVE ENERGY CAUTIONS 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 14: 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 15: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: (4) Remove 2 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 16 HOW TO INSERT THE F.P.C. CONNECTOR HOW TO REMOVE THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 6 Follow the steps below as illustrated in Figures 4 and 7 to insert the F.P.C. connector. and 5 to remove the F.P.C. connector. (1) Insert the F.P.C.
  • Page 17 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 18 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 Latch Board...
  • Page 19 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 20 F. 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 21 H. ASSEMBLING DOOR (3) Carefully pull the ventilation motor ASS'Y out of (1) When mounting the door assembly to the oven the microwave oven. (See Figure 18) 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 22 K. 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 6 screws securing it to the oven cavity. (Figure 20) (4) Disconnect the leadwire from the turntable motor terminals.

  • Page 23: 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. CHECK THE DOOR LATCH AND SWITCH ADJUSTMENT PROCEDURES CLOSING.
  • Page 24 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 25: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST A. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary When the door is opened slowly, an audible click switch. should be heard at the same time or successively Connect the ohmmeter leads to the common at intervals and the latches should activate the (COM) and normally open (NO) terminals of the switches with an audible click.

  • Page 26: Test And Checkout Procedures And Troubleshooting

    TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING - CAUTIONS - Filament - DISCONNECT THE POWER SUPPLY CORD Winding 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 27 COMPONENTS TEST PROCEDURES RESULTS Measure the resistance: Normal reading: (1) Terminal to terminal Momentarily indicates several ohms, and then gradually returns to infinite ohms. Abnormal reading: Ohm- Indicates continuity or infinite ohms meter from the beginning. HIGH-VOLTAGE Figure 25-a CAPACITOR (2) Terminal to case Normal readings: Infinite.
  • Page 28 COMPONENTS TEST PROCEDURES RESULTS Measure the resistance between terminal When When not pins of connector KEY CONNECTOR. Resistance touched touched 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 29: 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 30 (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 31 (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 32 7-21...
  • Page 33 7-22...
  • Page 34 7-23...
  • Page 35 7-24...

  • Page 36: Exploded View

    #EV# EXPLODED VIEW DOOR PARTS MODEL: 1004 1005 1002 1000 W109 1008 1003 1006 1011 1007 1009 -8-1-...

  • Page 37: Controller Parts

    #EV# CONTROLLER PARTS 2006 2004 2008 2381 W106 2002 MBM2 2000 -8-2-...

  • Page 38: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS W138 FOR MODEL W142 3010 W109 W138 W142 FOR MODEL 3024 W138 W142 3003 MEZ1 3029 3001 MFL1 3036 MFL3 3018 3034 6001 3014 5038 6000 3026 3028 5036 3011 W121 3026 3025 W121 -8-3-...

  • Page 39: Latch Board Parts

    #EV# LATCH BOARD PARTS 4000 4002 W111 4001 4003 4002 4004 -8-4-...
  • Page 40 #EV# INTERIOR PARTS(I) 3002 W101 3012 5009 W108 3008 5008 5035 3037 3009 W101 W105 W108 5018 W101 5002 5034 5000 -8-5-...
  • Page 41 #EV# INTERIOR PARTS(II) 3027 5015 5037 5045 5038 W108 W109 5337 5010 5006 5001 5016 5005 5014 W101 5007 5043 5044 3004 -8-6-...
  • Page 42 #EV# INSTALLATION PARTS 6008 W109 6011 6010 6009 -8-7-...

This manual is also suitable for:

721.62624721.80494721.80499721.62629721.80492

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