Sears 721.81622600 Manual Download Page 35 | Manualshive

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7-24

PROBLEM - D:

Unit does not heat up even if display counts down when

START key is touched for “GRILL” cooking.

Check:

1. PRIMARY AND SECONDARY INTERLOCK SWITCHES

2. HEATER THERMOSTAT

1

2

Resistance

incorrect

Replace

heater element

Normal

heater element

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Summary of Contents for 721.81622600

Page 1: ...DIVISION 22 BASIC FIELD MANUAL FOR MICROWAVE HOOD COMBINATION MODEL 721 81622600 721 81623600 721 81629600 April 2006 MODEL 721 81622 721 81623 721 81629...

Page 2: ...ignment 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: ...ERVICE 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...

Page 4: ...at 145 C 5 C Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Switch Magnetron 2M289 M47J1 High Voltage Capacitor Capacitor 1 0 F 2 1 KV AC High Voltage Diode Diode 350m...

Page 5: ...eration 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 prop...

Page 6: ...In the 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...

Page 7: ...4 1 OPERATING INSTRUCTIONS CONTROL PANEL 1 6 5 9 8 20 24 19 21 1 23 27 26 2 11 3 4 16 7 10 14 28 18 22 25 12 13 15 17...

Page 8: ...Ice Cream Cream Cheese or Frozen Juice 12 Melt Touch this pad to melt Butter or Margarine Chocolate Cheese or Marshmallow 13 Auto Defrost Touch this pad followed by Number Pads to thaw frozen meat by...

Page 9: ...re Codes Indications Display F 4 For sensor model Recommended Repair Procedure Connect a new sensor to the board If no failure code appears when starting sensor function replace control system assembl...

Page 10: ...OFF VENT 5 SPEED VENT LIGHT AUTO DEF DEF EXPRESS SEAFOOD POURLTY TIMER KITCHEN STOP CLEAR START ENTER SOFTEN 2 3 4 6 5 7 8 9 0 POWER COMBI OPTION PORK BEEF or MICRO TIME DEF N C N C N C N C N C N C 2...

Page 11: ...comes 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 an...

Page 12: ...cm2 All 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 mus...

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

Page 14: ...east 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 supplied at its rated...

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

Page 16: ...t HOW TO INSERT THE F P C CONNECTOR 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 2 Hold the pla...

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

Page 18: ...Remove the 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 I...

Page 19: ...ny adjacent parts or damage may occur 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...

Page 20: ...by removing the two screws securing it to the outer case 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 a...

Page 21: ...ed properly microwaves may leak from the clearance between the door and the oven I REMOVING THE VENTILATION FAN ASSEMBLY 1 Remove the mounting plate by removing the two screws securing it to the back...

Page 22: ...ng eight screws securing it to the oven cavity Figure 21 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the two screws securing the turntable motor to the oven cavity assembly F...

Page 23: ...ot be necessary Go to Steps 5 and 6 to check the sequence of the switches NOTE The correct sequence of the Primary Interlock Switch Secondary Interlock Switch and the Interlock Monitor Switch is very...

Page 24: ...tches 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 Primary and Secondary Int...

Page 25: ...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 Connect the ohmmeter leads to the...

Page 26: ...d HIGH VOLTAGE TRANSFORMER Wire leads 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...

Page 27: ...ading should be 40M ohm OL or a reading of infinity 3 Reverse the meter leads The reading should again indicate a reading of infinity If the diode shows infinity in BOTH directions it is NOT shorted 4...

Page 28: ...OK REHEAT 1 ON OFF VENT 5 SPEED VENT LIGHT AUTO DEF DEF EXPRESS SEAFOOD POURLTY TIMER KITCHEN STOP CLEAR START ENTER SOFTEN 2 3 4 6 5 7 8 9 0 POWER COMBI OPTION PORK BEEF or MICRO TIME DEF N C N C N C...

Page 29: ...ve the lead wires and operate oven Grill Cooking 1 Remove the wire leads 2 Measure resistance ohm meter scale Rx1 1 Remove the lead wires 2 Measure resistance ohm meter scale Rx1 1 Remove the wire lea...

Page 30: ...es with new ones make sure that they are correctly connected Check for microwave energy leakage according to INTERLOCK ADJUSTMENT PROCEDURES on page 7 12 when the primary interlock secondary interlock...

Page 31: ...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 32: ...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 33: ...ru F BUZZER Problems G 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 34: ...7 23 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 35: ...not heat up even if display counts down when START key is touched for GRILL cooking Check 1 PRIMARY AND SECONDARY INTERLOCK SWITCHES 2 HEATER THERMOSTAT 1 2 Resistance incorrect Replace heater elemen...

Page 36: ...7 25 PROBLEM E No buzzing when touching the key between stages or at end of cooking 1...

Page 37: ...7 26 PROBLEM F Ventilation fan does not operate when FAN HIGH LOW key is touched 1 Check 1 POWER SUPPLY 2 FUSE...

Page 38: ...8 1 EXPLODED VIEW INTRODUCTION PARTS EV CONTROL PANEL PARTS DOOR PARTS OVEN CAVITY PARTS INTERIOR PARTS LATCH BOARD PARTS MODEL 721 81622600 721 81623600 721 81629600...

Page 39: ...8 2 DOOR PARTS 1005 1000 1004 1006 1007 1011 1009 1382 1008 W109 1005 1000 1004 1006 1007 1011 1008 W109 1009 1381 EV For Model 721 81622 721 81629 For Model 721 81623...

Page 40: ...8 3 CONTROLLER PARTS 2004 2002 2000 2008 2381 2006 W106 2004 2008 2381 2006 W106 07 07 EV For Model 721 81622 721 81629 For Model 721 81623...

Page 41: ...38 W138 W142 W142 3001 3029 3024 3003 3004 3000 5015 5036 3025 3011 6000 6001 W108 6038 W118 W118 3010 FOR MODEL 721 81622 FOR MODEL 721 81629 721 81623 3010 W142 W138 W142 3026 8 4 OVEN CAVITY PARTS...

Page 42: ...8 5 4000 4001 4002 4003 4002 4004 W102 LATCH BOARD PARTS EV...

Page 43: ...8 6 INTERIOR PARTS I 3002 3046 3018 5020 5409 W178 3204 5067 W101 W101 5009 5008 5035 W101 9001 5034 W105 3009 4005 3203 W108 3037 5002 5018 5000 W101 W108 W108 3012 3008 5010 W101 EV...

Page 44: ...5006 5014 5019 5011 5004 W136 W101 W130 5041 5001 3027 5015 5045 5038 W109 5412 W108 5016 5037 W109 8 7 INTERIOR PARTS II EV...

Page 45: ...8 8 INSTALLATION PARTS 6008 W109 6011 6010 6009 VINYL BAG 05 COOKING GUIDE LABEL 01 OWNERS MANUAL 02 SERVICE MANUAL 06 1 UPPER TEMPLATE 06 2 WALL TEMPLATE 04 INSTALLATION MANUAL EV...

Page 46: ...P NO MFL30502901...

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