Related Manuals for Sears 721.80802400
Summary of Contents for Sears 721.80802400
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Page 1: Microwave Oven
MODEL 721. 80802 721. 80809 721. 80804 721. 80803 DIVISION 22 BASIC FIELD MANUAL MICROWAVE OVEN MODEL 721.80802400 / 721.80802401 721.80809400 / 721.80809401 721.80804400 / 721.80804401 721.80803400 / 721.80803401 June, 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. 80802 721. 80809 721. 80804 721. 80803 TABLE OF CONTENTS (Page) SAFETY PRECAUTIONS ...................... -
Page 4: Specifications
SPECIFICATIONS Rated Power Consumption 1700W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output 1150W (IEC 60705) Frequency 2,450 MHz ± 50 MHz Power Supply 120 VAC, 60 Hz Rated Current 15.5 Amp. (Microwave oven+Cook top lamps+Ventilation fan) Magnetron Cooling Forced Air Cooling Rectification Rectification Voltage Double Half-Wave Door Sealing... -
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 at least 20 amperes. B. Avoid placing the unit in a location where there is direct heat or splashing water. -
Page 7: Operating Ins
OPERATING INSTRUCTIONS CONTROL PANEL MAIN M E NU Cook Reheat Defrost Soften & Melt Favorites Options... -
Page 8: Control Panel Instructions
CONTROL PANEL INSTRUCTIONS 1. Display Screen shows the time of day and Cook Mode 6. POPCORN. Touch this pad to pop popcorn with the when the microwave oven is not in use. During sensor feature. The oven’s sensor will tell the oven how programming, it displays function menus for you to long to cook depending on the amount of humidity it choose from, servings and weights for you to enter,... -
Page 9: Model
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) L.V. TRANS- FORMER OVEN THERMOSTAT CONDENSER MAIN RELAY RY14 C/TOP 1 2 3 4 5 6 LAMP ON/OFF 1 2 3 4 5 6 RELAY SCR2 C/TOP HIGH M.G.T LAMP THERMOSTAT 5 LVL RY11... -
Page 11: Matrix Circuit For Touch Key Board
MATRIX CIRCUIT FOR TOUCH KEY BOARD Kitchen Start Add 30 Timer Enter Popcorn Clock Light... -
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 life of the A. The safety systems incorporated in this model are: magnetron.Whenever cooking dry foods (dried (1) Primary interlock switch fish,bread,etc.)or a small amount of food, be sure to... -
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 4000 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 EQUIPMENT CAUTIONS • TESTER (VOLTS-DC, AC, Ohmmeter) • Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to • Microwave survey meter servicing. - Holaday HI-1500 • The service personnel should inform the HI-1501 manufacture importer, or assembler of any certified - Narda... -
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 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. Circuit Board 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 Latch Board “ADJUSTMENT PROCEDURES” on page 7-12. Primary Interlock Switch Latch Board...
- Page 20 • When replacing the magnetron, be sure to install the D. REMOVING MAGNETRON (Figures 11 Through 12) magnetron gasket in the correct position and be sure that the gasket is in good condition. (1) Remove the vent grille by loosening two screws. (Figure 11) •...
- Page 21 E. REMOVING STIRRER FAN F. REMOVING DOOR (Figure 15) (Figures 13 and 14) (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 (1) When mounting the door assembly to the oven the microwave oven. (See Figure 18-b) 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 J. REMOVING THE TURNTABLE MOTOR K. REPLACING THE HUMIDITY SENSOR (1) Remove the glass tray and rotating ring. (1) Remove the sensor by removing two screws (2) Remove the turntable shaft VERY CAREFULLY securing it to the air duct. (See Figure 22) with a hand.
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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. CHECK THE DOOR LATCH AND SWITCH ADJUSTMENT PROCEDURES 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.S ECONDARY 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 (COM)and normally open (NO)terminals of the... -
Page 27: Test And Checkout Procedures And Trouble Shooting
TEST AND CHECKOUT PRECEDURES 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 LEAD WIRES FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. 2. - Page 28 COMPONENTS TEST RESULTS 1. Remove wire leads. CAPACITOR 2. Measure resistance. (ohm meter scale: Rx1000) • Terminal to terminal Normal: Momently indicates several ohm, and then gradually returns to infinite • Terminal to case Normal: Infinite. 1. Measure continuity. Forward. Normal:Continuity.
- Page 29 COMPONENTS TEST RESULTS 1.Remove lead wires. Normal: VENTILATION MOTOR 2.Measure resistance. Approximately 20 to 40 ohms (ohm meter scale:Rx1) Abnormal:Infinite Normal: Approximately 1. Remove wire leads. TURNTABLE MOTOR 2.0 to 3.0 Kohms 2. Measure resistance. Abnormal: (ohm meter scale: Rx1000) Infinite or several.
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Page 30: Key Matrix
KEY MATRIX COMPONENTS TEST PROCEDURES RESULTS TOUCH KEY BOARD 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 31: Checkout Procedures
B. CHECKOUT PROCEDURES (1) CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE. PROBLEMS CAUSES Fuse blows immediately after the door is closed. Improper operation of the primary interlock,secondary Fuse blows immediately after interlock switches and/or the interlock monitor switch. the door is opened. - Page 32 (2)CHECKOUT PROCEDURES FOR RELAY. -PROBLEM (A)- -PROBLEM (A)-- FAN motor turns on without touching START key Oven lamp turns on without touching START key when the door is closed. when the door is closed. Remove the mate connector of I/O Remove the mate connector of I/O GOOD GOOD...
- Page 33 (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit 5) Some segments of one or more digits do not light board. up,or they continue to light up,or segments light 1) Check the input current.If the input current is more when they should not.
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Page 38: Exploded View
#EV# EXPLODED VIEW DOOR PARTS Model: 721.80802400 / 721.80802401 721.80809400 / 721.80809401 721.80804400 / 721.80804401 721.80803400 / 721.80803401 1002 1005 1000 1004 FOR 721.80803 ONLY 1381 W171 1008 1382 1007 1006 1011 W109 1009... -
Page 39: Controller Parts
#EV# CONTROLLER PARTS For Model: 721.80802 721.80809 721.80804 2004 2381 2006 2008 2002 2000 2400 W130 For Model: 721.80803 2004 2006 2381 2008 2400 W130... -
Page 40: Oven Cavity Parts
#EV# OVEN CAVITY PARTS W138 FOR 721.80802 W138 721.80804 W142 W138 FOR 721.80803 W142 3010 W142 721.80809 3024 3031 W138 W109 W142 3029 3001 6001 3003 W202 3032 W178 3045 3036 3005 3037 6000 3018 3011 W121 3025 3026... -
Page 41: Latch Board Parts
#EV# LATCH BOARD PARTS 4000 4002 W102 4001 4003 4002 4004... - Page 42 #EV# INTERIOR PARTS (I) 3002 3381 Back W110 5008 5012 W109 W101 5003 5007 W109 5000 5002 5049 5024 W109 5018 5058 5412 5009 5043 W109 5044 5023 3009 W105 W109 3007 W109 3004 5035...
- Page 43 #EV# INTERIOR PARTS (II - I) Model: 721.80802400 Check the rating label of Model and order 721.80809400 SVC parts according to the Model No. 721.80804400 721.80803300 5707 W150 3027 W150 3033 W109 W144 5027 5001 5016 5011 * Check the Model No.
- Page 44 #EV# INTERIOR PARTS (II - II) Model: 721.80802401 Check the rating label of Model and order 721.80809401 SVC parts according to the Model No. 721.80804401 721.80803401 5707 W150 3027 W109 W150 3033 W144 W144 5027 5001 5016 5011 * Check the Model No.
- Page 45 #EV# INSTALLATION PARTS 6011 6008 6010 6009 VINYL...
- Page 46 P/NO : 3828W5S4602 Printed in Korea...