Related Manuals for Sears 721.81622600
Summary of Contents for Sears 721.81622600
- Page 1 MODEL 721.81622 721.81623 721.81629 DIVISION 22 BASIC FIELD MANUAL FOR MICROWAVE HOOD COMBINATION MODEL 721.81622600 721.81623600 721.81629600 April, 2006...
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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 721.81622 721.81623 721.81629 TABLE OF CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front page SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1... -
Page 4: Specifications
SPECIFICATIONS Rated Power Consumption - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1650W 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. Technicians 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 21 1... -
Page 8: Control Panel Instructions
CONTROL PANEL INSTRUCTIONS 1. Display. The display includes a clock and indicators to 14. Express Defrost. Touch this pad to express tell you time of day, cooking time settings, cook powers, defrost. “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 Failure Codes/Indications Display Likely Failure Condition Recommended Repair Procedure Humidity Sensor Connect a new sensor to the board. If no failure (For sensor model) Failure code appears when starting sensor function, replace control system assembly. -
Page 10: Matrix Circuit For Touch Key Board
MATRIX CIRCUIT FOR TOUCH KEY BOARD EXPRESS MICRO POWER GRILL DEF. VENT VENT STOP/ ENTER/ LIGHT MELT SOFTEN ON/OFF 5 SPEED CLEAR START AUTO COOK POPCORN REHEAT ADD 30S SEAFOOD POURLTY DEF. KITCHEN BEEF or CLOCK MORE LESS COMBI OPTION TIMER PORK TIME... -
Page 11: 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 12: Service Information
SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY (3) Do not operate the unit until it is completely A. SINCE APPROXIMATELY 2100 VOLTS EXISTS repaired, if any of the following conditions exist. IN SOME CIRCUITS OF THIS UNIT REPAIRS The unit must not be operated. SHOULD BE CARRIED OUT WITH GREAT (a) The door does not close firmly. -
Page 13: 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 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 the three screws securing the circuit board. UNIT MUST BE DISCONNECTED FROM THE ELECTRICAL 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 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 17 B. REMOVING THE OUTER CASE (Figure 8) (1) Remove the vent grille by removing the two screws securing it to the outer case. (2) Remove the two screws securing it to the front bracket. (3) Remove the two screws securing it to the air duct. (4) Remove the mounting plate by turning the two screws securing it to the outer case.
- Page 18 C. REMOVING THE DOOR INTERLOCK SWITCHES (Figures 9,10) (1) Disconnect the wire leads from the interlock switches. (2) Remove the 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 YL(from Grill Heater Thermostat)
- 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 damage (1) Remove the vent grille. may occur. (2) Remove the mount, all. (3) Remove the outer case. •...
- Page 20 E. REMOVING GRILL HEATER (Figure 14) F. REMOVING DOOR (Figure 15) (1) Remove the outer case. (1) Remove the vent grille by removing the two screws (2) Remove the air duct by removing six screws securing it to the outer case. securing it to the oven front plate, guide air and (2) Lift up and draw the door.
- Page 21 H. ASSEMBLING DOOR (3) Carefully pull the ventilation motor assembly out of the microwave oven. (See Figure 19) (1) When mounting the door assembly to the oven assembly, be sure to adjust the door assembly parallel to the chassis. Also adjust the door so there is no play between the inner door surface and oven frame assembly.
- Page 22 J. REMOVING THE TURNTABLE MOTOR (1) Remove the turntable. (2) Remove the turntable shaft VERY CAREFULLY with a slotted screwdriver. (Figure 20) (3) Remove the base plate by removing eight screws securing it to the oven cavity. (Figure 21) (4) Disconnect the leadwire from the turntable motor terminals.
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Page 23: Interlock System
INTERLOCK SYSTEM INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to stop the microwave activity when the door is opened during cooking and 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 24 TEST THE LATCH AND SWITCH SEQUENCE (5) Open the oven door slowly and watch the door (7) When you achieve the proper sequence of latch, secondary switch, release rod and lever on switches in Steps 5 and 6, tighten the latch board the switches so they activate in the following screws at that point.
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Page 25: 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. Connect the ohmmeter leads to the common If the latches do not activate the switches when the (COM) and normally open (NO) terminals of the... -
Page 26: Test And Checkout Procedures And Trouble Shooting
TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING - CAUTIONS - - DISCONNECT THE POWER SUPPLY CORD 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 TRANSFORMER. - Page 27 COMPONENTS TEST PROCEDURES RESULTS 1. Check DC 9V battery before performing tests. 2. Select the DCV scale on the meter. 3. Using the meter, battery, and jump wire, connect the items as illustrated in figures. • Terminal to terminal Normal: Approximately 9V Abnormal: Approximately 0V...
- Page 28 COMPONENTS TEST PROCEDURES RESULTS STEP 3. Test the diode for reverse biasing. Normal: Procedure: Approximately 0V 1. Using the same scale on the meter, connect the positive side of the battery to the anode of the diode as illustrated in Figure 27-3. 2.
- Page 29 COMPONENTS TEST PROCEDURES RESULTS POWER 1. Measure continuity. OPEN CLOSE LEVEL (ohm meter scale: Rx1) 2. Remove the lead wires and operate 4 sec 18 sec oven at power level 1 through power level 10 . 6 sec 16 sec 8 sec 14 sec 10 sec...
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Page 30: Checkout Procedures
NOTES: • A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON. • MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION. • WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT THE WIRES. - 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 7-22...
- Page 34 7-23...
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Page 38: Exploded View
#EV# EXPLODED VIEW INTRODUCTION PARTS MODEL 721.81622600 721.81623600 721.81629600 OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... -
Page 39: Door Parts
#EV# DOOR PARTS For Model: 721.81622 721.81629 1005 1004 1000 W109 1382 1008 1006 1011 1007 1009 For Model: 721.81623 1005 1004 1000 1381 W109 1008 1006 1011 1007 1009... -
Page 40: Controller Parts
#EV# CONTROLLER PARTS For Model: 721.81622 721.81629 2004 2006 2002 2000 W106 2008 2381 For Model: 721.81623 2004 2006 W106 2008 2381... -
Page 41: Oven Cavity Parts
#EV# OVEN CAVITY PARTS W138 W142 3010 FOR MODEL 3010 721.81622 W138 W142 W142 FOR MODEL 721.81629 721.81623 3024 W138 W142 3003 3029 3001 3000 3004 6001 6038 W108 6000 5036 W118 5015 3026 3011 3025 W118... -
Page 42: Latch Board Parts
#EV# LATCH BOARD PARTS 4000 4002 W102 4001 4003 4004 4002... - Page 43 #EV# INTERIOR PARTS (I) 5020 5409 3018 W178 W101 3046 W101 3204 5067 3002 W101 5009 5010 3012 3008 5008 5035 3203 4005 W108 W108 3009 9001 W101 W105 5018 5002 W101 5000 3037 5034 W108...
- Page 44 #EV# INTERIOR PARTS (II) 5038 3027 W109 5045 5015 5412 5037 W108 5006 5016 W136 5019 W109 W101 W130 5001 5004 5041 5011 5014...
- Page 45 #EV# INSTALLATION PARTS 6008 W109 6011 6010 6009 VINYL COOKING OWNERS SERVICE INSTALLATION GUIDE MANUAL MANUAL MANUAL LABEL *06-1 *06-2 UPPER WALL TEMPLATE TEMPLATE...
- Page 46 P/NO : MFL30502901...
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