Sears 721.80412500 Basic Field Manual Download Page 1

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DIVISION 22

BASIC FIELD MANUAL

FOR

MICROWAVE OVEN

MODEL 721.80412500 / 721.80412501

721.80419500 / 721.80419501
721.80414500 / 721.80414501
721.80413500 / 721.80413501

May, 2005

MODEL 721.80412

721.80419
721.80414
721.80413

Summary of Contents for 721.80412500

Page 1: ...N 22 BASIC FIELD MANUAL FOR MICROWAVE OVEN MODEL 721 80412500 721 80412501 721 80419500 721 80419501 721 80414500 721 80414501 721 80413500 721 80413501 May 2005 MODEL 721 80412 721 80419 721 80414 72...

Page 2: ...lignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted...

Page 3: ...E INFORMATION 7 1 PRECAUTIONS AND REPAIR SERVICE TIPS 7 1 MICROWAVE LEAKAGE TEST 7 2 POWER OUTPUT MEASUREMENT 7 3 DISASSEMBLY INSTRUCTIONS 7 4 INTERLOCK SYSTEM 7 12 INTERLOCK CONTINUITY TEST 7 14 TEST...

Page 4: ...t 90 C 5 C Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Switch Magnetron 2M214 161GP High Voltage Capacitor Capacitor 1 0 F 2 1 KV AC High Voltage Diode Diode 350mA 9...

Page 5: ...operation of the microwave oven requires that the magnetron be assembled to the waveguide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is pr...

Page 6: ...he event of an electrical short circuit grounding reduces the risk of electrical shock The plug must be plugged into an outlet that is properly installed and grounded 3 1 INSTALLATIONS BEFORE YOU BEGI...

Page 7: ...4 1 OPERATING INSTRUCTIONS CONTROL PANEL 1 2 5 8 12 16 19 22 17 9 3 7 6 11 13 14 15 18 21 24 20 10 4 23 6...

Page 8: ...w frozen meat by weight 12 Number Pads Touch number pads to enter cooking times cook powers quantities weights or food categories 13 Express Defrost Touch this pad to express defrost GROUND BEEF 1 0 L...

Page 9: ...5 1 OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM RY1 O L RY14 C L HIGH RY15 C L NIGHT RY11 V M RY6 T M...

Page 10: ...5 2 MATRIX CIRCUIT FOR TOUCH KEY BOARD...

Page 11: ...omes on The unit will begin cooking and the display window will show the time counting down by seconds D After about 5 minutes make sure the primary interlock switch the secondary interlock switch and...

Page 12: ...ll service adjustments should be made for minimum microwave energy leakage readings 3 Do not operate the unit until it is completely repaired if any of the following conditions exist The unit must not...

Page 13: ...crowave oven should not exceed 4 mW cm2 Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage EQUIPMENT TESTER VOLTS DC AC Ohmmeter Microwave surve...

Page 14: ...ve been used 3 At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer 1 Microwave power output measurement is made with the microwave oven sup...

Page 15: ...ALL CIR CUIT DIAGRAM ESPECIALLY SWITCHES AND HIGH VOLTAGE CIRCUIT A REMOVING POWER AND CONTROL CIRCUIT BOARD Figures 1 2 and 3 1 Remove a screw securing the control panel assembly to the oven cavity 2...

Page 16: ...ONNECTOR Follow the steps below as illustrated in Figures 6 and 7 to insert the F P C connector 1 Insert the F P C connector into the terminal socket securely with the fingers 2 Hold the plastic faste...

Page 17: ...move the mounting plate by turning the two screws securing it to the out case 5 Remove the base plate by removing four screws securing it to the out case Remove the Mount All from the out case by remo...

Page 18: ...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 I...

Page 19: ...cent parts or it may be damaged When replacing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition After replacing the magnet...

Page 20: ...monitor switch operate normally After replacing the door check for microwave energy leakage with a survey meter Microwave energy leakage must be below the limit of 5mW cm2 With a 275 ml water load F D...

Page 21: ...ounted properly microwaves may leak from the clearance between the door and the oven H REMOVING THE VENTILATION FAN ASS Y 1 Remove the mounting plate by removing two screws securing it to the back pla...

Page 22: ...emoving eight screws securing it to the oven cavity Figure 20 4 Disconnect the leadwire from the turntable motor terminals 5 Remove a screw securing the turntable motor to the oven cavity ASS Y Figure...

Page 23: ...nt of the latch board may not be necessary Go to Steps 5 and 6 to check the sequence of the switches NOTE To correct sequence of the Primary Interlock Switch Secondary Interlock Switch and the Interlo...

Page 24: ...the body of the switches in the following sequence Interlock Monitor Switch Primary Interlock Switch Secondary Interlock Switch NOTE The Interlock Monitor Switch is an added safety check on the Primar...

Page 25: ...he secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch C...

Page 26: ...ads are removed 1 Measure the resistance Across the filament terminals of the magnetron with an ohm meter on Rx1 scale 2 Measure the resistance Between each filament terminal of the magnetron and the...

Page 27: ...mentarily indicates several ohms and then gradually returns to infinite ohms Abnormal reading Indicates continuity or infinite ohms from the beginning Normal readings Infinite Abnormal reading Indicat...

Page 28: ...necting the FPC connector make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON For detail matrix c...

Page 29: ...k switches and or the interlock monitor switches are adjusted or replaced 7 18 COMPONENTS TEST PROCEDURES RESULTS RELAY2 Check for continuity of relay 2 with an ohm meter Remove wire leads from relay...

Page 30: ...Does the unit still operate Replace the circuit board Replace RELAY1 NO NO YES YES GOOD Defective RELAY1 PROBLEM B Oven lamp turn on When the door is closed and START key is touched Measure the voltag...

Page 31: ...perates 3 Proper temperature measurement is not obtained 4 The buzzer does not sound or continues to sound 5 Some segments of one or more digits do not light up or they continue to light up or segment...

Page 32: ...ru E BUZZER Problems F PROBLEM A PLEASE SET TIME OF DAY does not appear in display window when power supply cord is plugged into wall outlet PROBLEM B Display does not show correct numbers and or corr...

Page 33: ...7 22 PROBLEM C Unit does not heat up even if display counts down when START key is touched for HIGH POWER cooking Check 1 PRIMARY AND SECONDARY INTERLOCK SWITCHES 2 THERMOSTAT 1 2...

Page 34: ...7 23 PROBLEM D No buzzing when touching the key between stages or at end of cooking 1...

Page 35: ...7 24 PROBLEM E Ventilation fan does not operate when FAN HIGH LOW key is touched 1 Check 1 POWER SUPPLY 2 FUSE...

Page 36: ...ODED VIEW DOOR PARTS 1005 1000 1002 1004 1006 1007 1011 1009 1381 For 721 80413 1003 1008 W109 EV Model 721 80412500 721 80412501 721 80419500 721 80419501 721 80414500 721 80414501 721 80413500 721 8...

Page 37: ...8 2 CONTROLLER PARTS 2004 2002 2000 2008 2381 2006 W106 07 2004 2008 2006 W106 07 2381 EV FOR MODEL 721 80412 721 80419 721 80414 FOR MODEL 721 80413...

Page 38: ...W138 W142 W142 W142 3001 3029 3024 3003 3036 3018 3034 3026 3028 5036 3026 3025 3011 6000 5038 3014 6001 W118 W118 W109 3010 FOR MODEL 721 80412 721 80414 FOR MODEL 721 80419 721 80413 8 3 OVEN CAVITY...

Page 39: ...8 4 4000 W102 4001 4002 4003 4002 4004 LATCH BOARD PARTS EV...

Page 40: ...8 5 INTERIOR PARTS I 3002 3012 3008 W101 5009 W108 5008 5035 W101 5034 5000 5002 5018 W101 W105 3009 W108 3037 EV...

Page 41: ...3027 5015 5045 5037 5038 5006 5010 5016 5014 W109 W108 5337 5004 5011 5058 5044 5043 3004 W136 W101 5041 5001 5024 8 6 INTERIOR PARTS II EV...

Page 42: ...8 7 INSTALLATION PARTS 01 OWNERS MANUAL 02 SERVICE MANUAL 06 1 UPPER TEMPLATE 06 2 WALL TEMPLATE 04 INSTALLATION MANUAL 05 COOKING GUIDE LABEL 6008 W109 6011 6010 6009 VINYL BAG EV...

Page 43: ...Printed in Korea P NO 3828W5S5237...

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