Sears 721.80402400 Manual Download Page 28 | Manualshive

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7-16

Normal:
High Speed: Approximately
60 to 75 ohms
Low Speed: Approximately
115 to 125 ohms

Normal: Approximately
2.5 to 3.5 Kohms
Abnormal:
Infinite or several.

1. Remove lead wires.
2. Measure resistance.

(ohm meter scale: Rx1)

High Speed: BL & BK Wire
Low Speed: BL & WH Wire

1. Remove wire leads.
2. Measure resistance.

(ohm meter scale: Rx1000)

VENTILATION MOTOR

TURNTABLE MOTOR

1. Remove lead wires.
2. Measure resistance.

(ohm meter scale: Rx1)

Normal:
Approximately 120 to 135 ohms
Abnormal: Infinite

STIRRER MOTOR

COMPONENTS

TEST RESULTS

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Summary of Contents for 721.80402400

Page 1: ...OWAVE HOOD COMBINATION MODEL 721 80402400 721 80402401 721 80402402 721 80409400 721 80409401 721 80409402 721 80404400 721 80404401 721 80404402 721 80403400 721 80403401 721 80403402 May 2005 MODEL...

Page 2: ...oper alignment 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 ad...

Page 3: ...NS 4 2 OVERALL CIRCUIT DIAGRAM 5 1 SCHEMATIC DIAGRAM I 5 1 SCHEMATIC DIAGRAM II 5 2 MATRIX CIRCUIT FOR TOUCH KEY BOARD 5 3 GENERAL INFORMATION FOR SERVICE 6 1 GENERAL PRECAUTIONS IN USE 6 1 TRIAL OPER...

Page 4: ...y Interlock Switch Interlock Monitor Switch Magnetron 2M246 Cook top Lamp 120 V 30 W Cavity Lamp 125 V 30 W or 40 W Timer Digital up to 99 min 99 sec in each cooking stage Tray Tempered Safety Glass O...

Page 5: ...g operation BEFORE TOUCHING any parts of the oven always remove the power plug from the outlet Remove your watches whenever working close to or replacing the Magnetron DO NOT touch any parts of the co...

Page 6: ...ROUNDING INSTRUCTIONS For personal safety this appliance must be fully grounded at all times In the event of an electrical short circuit grounding reduces the risk of electrical shock The plug must be...

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

Page 8: ...owed by number pads to thaw frozen meat by weight 11 Number Pads Touch number pads to enter cooking times cook powers quantities weights or food categories 12 Express Defrost Touch this pad to express...

Page 9: ...RMOSTAT OVEN FUSE BK BK O L PRIMARY SWITCH RD RD RD RD F M T T M BN MONITOR SWITCH TRANSFORMER H V FA F WH V M H V CAPACITOR C L S M HIGH C CONDENSER BL THERMISTOR SECONDARY SWITCH YL BK RD WH LOW RD...

Page 10: ...RELAY POWER RY2 RY1 MAIN RELAY 1 2 3 1 3 1 2 3 5 5 4 4 5 4 6 6 7 8 6 1 2 2 1 RY14 LAMP C TOP HIGH RELAY RY15 RELAY C TOP LOW LAMP FAN VENT HIGH RY11 RY12 FAN LOW VENT BK YL BL WH 8 PIN CONNECTOR CN1 C...

Page 11: ...5 3 MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX...

Page 12: ...show the time counting down by seconds D After about 5 minutes make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by opening and c...

Page 13: ...the limit of 5 mW 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...

Page 14: ...vicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 1mW cm2 sq And always start measuring of an unknown field to assure safety for operating per...

Page 15: ...have been used 3 At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer POWER OUTPUT MEASUREMENT 1 Microwave power output measurement is made...

Page 16: ...R AND CONTROL CIRCUIT BOARD Figures 1 2 and 3 1 Remove a screw securing the control panel assembly to the oven cavity 2 Remove the control panel with pushing it upward 3 Remove the connectors CN1 CN2...

Page 17: ...ert the F P C connector into the terminal socket securely with the fingers 2 Hold the plastic fastener with thumb and forefinger of the other hand and push it slowly into the terminal socket Figure 6...

Page 18: ...rning the screws 1 or 2 screws securing it to the out case 4 Remove two screws on the left central edge and one screw on the right central edge of Base plate Remove the Mount All from the out case by...

Page 19: ...ecuring the Latch Board 3 Make necessary replacements and check microwave energy leakage according to ADJUSTMENT PROCEDURES on page 7 12 Latch Board Primary Interlock Switch Monitor Interlock Switch S...

Page 20: ...etron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition After replacing the magnetron check for microwave energy leakage with a survey me...

Page 21: ...etc 2 Remove two screws securing it to the door handle CAUTION Be careful not to damage door seal plate with the screwdriver H ASSEMBLING DOOR 1 When mounting the door assembly to the oven assembly b...

Page 22: ...Remove the base plate by removing 8 screws securing it to the oven cavity Figure 20 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the 1 screws securing the turntable motorto th...

Page 23: ...d and the switches as shown in Figure 23 a 2 Close the door tightly and check gaps A and B to be sure they are no more than 1 64 0 5 mm See Figure 23 b for close up view of gaps A and B door latches I...

Page 24: ...o to 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 P...

Page 25: ...hen the 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 swi...

Page 26: ...1 Remove wire leads 2 Measure resistance ohm meter scale Rx1 Primary winding Secondary winding Filament winding 3 Measure resistance ohm meter scale Rx1000 Primary winding to ground Filament winding t...

Page 27: ...Rx1000 CAPACITOR DIODE Some inexpensive ohm meters may indicate infinite resistance in both directions 1 Measure continuity ohm meter scale Rx1 2 Remove the lead wires and operate oven at power level...

Page 28: ...1 Remove lead wires 2 Measure resistance ohm meter scale Rx1 High Speed BL BK Wire Low Speed BL WH Wire 1 Remove wire leads 2 Measure resistance ohm meter scale Rx1000 VENTILATION MOTOR TURNTABLE MOT...

Page 29: ...MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON TOUCH KEY BOARD Resistance value When touched Less than 400 ohms When not touched More than 1 mega ohm FPC CONNECTOR Top 1 2 3 4 5 6 7 8 9 10 11 1...

Page 30: ...ADJUSTMENT PROCEDURES on page 7 12 when the primary interlock secondary interlock switches and or the interlock monitor switches are adjusted or replaced Fuse blows immediately after the door is close...

Page 31: ...ithout touching START key when the door is closed GOOD Remove the mate connector of I O CON from the circuit board Does the unit still operate Defective Wire Assembly Replace the circuit board Replace...

Page 32: ...sly operates 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 se...

Page 33: ...2 FUSE See CHECKOUT PROCEDURES FOR FUSE BLOWING on page 7 19 3 OVEN CAVITY THERMOSTAT 1 1 Measure voltage between pin 1 and pin 3 of connector CN1 0 120 120V Replace circuit board Normal circuit board...

Page 34: ...board Contact OK Normal contact Correct seating Check contact of connector S1 Check the contact of relay 2 see page 7 15 Runs Runs Resistance incorrect Check the continuity of H V C see page 7 14 Nor...

Page 35: ...7 23 PROBLEM F No buzzing when touching the key between stages or at end of cooking 1 Normal circuit board Check normal operation circuit board Replace circuit board Runs...

Page 36: ...ce magnetron thermostat and oven thermostat Poor contact Replace circuit board Normal circuit board Contact OK Normal contact Correct seating Check contact of connector S1 see page 7 5 NO runs Check t...

Page 37: ...8 2 DOOR PARTS II 1005 1000 1002 1006 1011 1007 1009 1004 W109 1381 1008 EV...

Page 38: ...8 4 CONTROLLER PARTS II 2004 2381 2008 2006 W106 MBM2 EV...

Page 39: ...8 5 OVEN CAVITY PARTS 3010 W109 3001 3029 3014 6038 6001 6000 3011 3025 W121 W118 3026 3028 W121 W118 3018 3036 3024 W142 W138 For Model For Model 5036 3003 MFL1 MFL3 EV...

Page 40: ...8 6 LATCH BOARD PARTS 4001 W111 W102 4000 4002 4003 4002 4004 EV...

Page 41: ...8 7 INTERIOR PARTS I W101 5023 3002 3017 3008 5009 5049 W101 5000 5002 5018 W101 W105 3009 W108 W108 3037 5067 W136 W104 5008 5035 W109 W101 EV...

Page 42: ...5006 5010 5001 5016 5005 5014 W105 5044 3004 3027 5024 5029 W101 W144 5412 W110 5012 5007 Check the Model No Check the Model No Check the Model No Check the Model No EV Check the rating label of Model...

Page 43: ...8 10 INSTALLATION PARTS 6008 W109 6011 6010 VINYL BAG 6009 EV...

Page 44: ...P NO 3828W5S5223 Printed in Korea...

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