Related Manuals for Sears 721.63652300
Summary of Contents for Sears 721.63652300
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Page 1: Microwave Oven
MODEL 721.63652 721.63659 721.63654 721.63653 DIVISION 22 BASIC FIELD MANUAL MICROWAVE OVEN MODEL 721.63652300 / 721.63652301 721.63659300 / 721.63659301 721.63654300 / 721.63654301 721.63653300 / 721.63653301 June, 2005... -
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. MODEL 721. 63652 721. 63659 721. 63654 721. 63653 TABLE OF CONTENTS (Page) SAFETY PRECAUTIONS ...................... -
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................Rectification Voltage Double Half-Wave Door Sealing .................Choke System Safety Devices..............Magnetron Thermal Fuse:... -
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
INSTALLATION 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 Ins
OPERATING INSTRUCTIONS CONTROL PANEL... -
Page 8: Control Panel Instructions
CONTROL PANEL INSTRUCTIONS 1. Display. The display includes a clock and indicators to tell you time of day, cooking time settings, cook 18. Cook Time. Touch this pad followed by Number powers, quantities, weights and cooking functions Pads to set a cooking time. selected. -
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) -
Page 11: Matrix Circuit For Touch Key Board
MATRIX CIRCUIT FOR TOUCH KEY BOARD Frozen Turntable Hold Frozen Favorite Express Canned Vegetable Warm Entree Recipe Vegetable Defrost On/Off VENT LIGHT Dinner VENT Soup or High/Night/Off 5 Speed Plate Sauce On/Off Fresh Auto Auto Popcorn Pizza Potato Minute Reheat Defrost Vegetable Auto... -
Page 12: 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 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 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 15: Power Output Measurement
MEASUREMENT WITH THE OUTER CASE NOTE WHEN MEASURING REMOVED (1) Do not exceed meter full scale deflection. (2) The test probe must be moved 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- Circuit Board UITY CHECKS. WHEN RECONNECTING THE WIRE LEADS TO ANY PART, MAKE SURE THE WIRING CONNE- CTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIR- CUIT DIAGRAM. - Page 17 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 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 air duct. (3) Remove the mounting plate by turning the screws (1 or 2 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 “ADJUSTMENT PROCEDURE” on page 7-12. Latch Board Secondary Interlock Switch...
- 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 by loosening two screws. damaged. (Figure 11) •...
- Page 21 E. REMOVING STIRRER FAN F. REMOVING DOOR (Figure 16) (Figures 14 and 15) (1) Remove the vent grille by two screws securing it to (1) Remove one rivet ASS'Y securing it to the oven the outcase loosening. upper plate by using knife blade. (2) Lift up and draw the door.
- Page 22 H. ASSEMBLING DOOR (3) Carefully pull the ventilation motor ASS'Y out of the microwave oven. (See Figure 19-b) (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 K. REMOVING THE TURNTABLE MOTOR NOTES: • Remove the leadwire from the turntable motor VERY (1) Remove the turntable. CAREFULLY. (2) Remove the turntable shaft VERY CAREFULLY • Be sure to grasp the connector not the wires when with a slotted screwdriver. (Figure 20) removing.
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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.
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Page 26: 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 27: Test And Checkout Procedures And Trouble Shooting
TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING - CAUTIONS - Secondary - DISCONNECT THE POWER SUPPLY CORD Winding FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE Filament... - Page 28 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 29 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.
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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 8 sec 14 sec Relay 2 10 sec 12 sec RELAY2 12 sec... - Page 31 (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 Defective circuit board...
- 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...
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Page 38: Exploded View
#EV# EXPLODED VIEW DOOR PARTS Model: 721.63652300 / 721.63652301 721.63659300 / 721.63659301 721.63654300 / 721.63654301 721.63653300 / 721.63653301 1005 1002 1000 1004 1011 For Model 1381 721.63653 1008 1007 1006 W109 1003 1009... -
Page 39: Controller Parts
#EV# CONTROLLER PARTS For Model: 721.63652 721.63659 2004 721.63654 2381 W106 2002 2000 2006 2008 * 07 For Model: 721.63653 2004 2381 W106 2006 2008 * 07... -
Page 40: Oven Cavity Parts
#EV# OVEN CAVITY PARTS For Model W142 721.63653 721.63659 For Model W108 721.63652 W138 721.63654 3010 3031 W109 For Model W142 721.63653 3024 721.63659 For Model 721.63652 W138 721.63654 3029 3001 3003 W121 3043 6001 3014 3036 3032 5038 3018 W121 5036 6000... -
Page 41: Latch Board Parts
#EV# LATCH BOARD PARTS 4000 4001 4002 W111 4003 4002 4004... - Page 42 #EV# INTERIOR PARTS (I) 3002 5009 3012 W101 5002 3008 W108 5049 5000 5018 3034 W101 5008 W101 5058 5024 W108 5043 3009 5044 5019 W105 5035 W101 3004...
- Page 43 #EV# INTERIOR PARTS (II - I) Model: 721.63652300 Check the rating label of Model and order 721.63659300 SVC parts according to the Model No. 721.63654300 3027 721.63653300 5045 W146 5015 5012 5038 W136 5022 W101 5006 5027 5010 5011 5016...
- Page 44 #EV# INTERIOR PARTS (II - II) Model: 721.63652301 Check the rating label of Model and order 721.63659301 SVC parts according to the Model No. 721.63654301 721.63653301 3027 5045 W146 5015 5012 5038 W136 5022 W101 5006 5027 5010 5011 5016 5001 W105 5007...
- Page 45 #EV# INSTALLATION PARTS 6011 6008 6010 6009 VINYL...
- Page 46 P/NO : 3828W5S4598 Printed in Korea...
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