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DIVISION 20

BASIC FIELD MANUAL

FOR

MICROWAVE OVEN

MODEL 721.67902600

721.67903600
721.67909600

JUNE, 2006

MODEL 721.67902

721.67903
721.67909

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Содержание 721.67902600

Страница 1: ...DIVISION 20 BASIC FIELD MANUAL FOR MICROWAVE OVEN MODEL 721 67902600 721 67903600 721 67909600 JUNE 2006 MODEL 721 67902 721 67903 721 67909...

Страница 2: ...proper 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 adjusted by...

Страница 3: ...1 CONTROL PANEL 4 1 OPERATING SEQUENCE 4 2 SCHEMATIC DIAGRAM 4 3 CIRCUIT DESCRIPTION 4 4 SERVICE INFORMATION 5 1 TOOLS AND MEASURING INSTRUMENTS 5 1 MICROWAVE LEAKAGE TEST 5 1 MEASUREMENT OF MICROWAV...

Страница 4: ...Switch Secondary Interlock Switch Interlock Monitor Switch Magnetron 2M246 High Voltage Capacitor Capacitor 1 0 F 2 1 KV AC High Voltage Diode 350 mA 9 0 KV Cavity Lamp 125 V 20 W Tray Tempered Safet...

Страница 5: ...rea Proper 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 g...

Страница 6: ...cal parts of the unit Do not install the oven next to a conventional surface unit or above a conventional wall oven 5 Use microwave oven in an ambient temperature less than 104 F 40 C 6 Place the micr...

Страница 7: ...e oven how long to cook depending on the amount of humidity it detects from the popcorn 9 SENSOR REHEAT Touch this pad to reheat precooked room temperature or refrigerated foods The oven s sensor will...

Страница 8: ...and hold START PAUSE pad LOCKED disappear in the display 5 WARM HOLD To keep hot cooked food warm 6 MORE LESS The More and Less functions will adjust the cook time of many oven functions More Less wi...

Страница 9: ...Sensor Reheat Select Sensor menu Stop Clear Convection Select Temperature Start Pause Stop Clear Combi Start Pause Cooking Time Cooking Time Start Pause Stop Clear Auto Defrost Select Food category E...

Страница 10: ...SCHEMATIC DIAGRAM 4 4 SYMBOL BN WH BK BL YL PK RD GN BROWN WHITE BLACK BLUE YELLOW PINK RED GREEN COLOR NOTE 1 DOOR IS OPENED 2 WIRE COLOR...

Страница 11: ...the high voltage capacitor The negative 4 000 Volts DC is applied to the filament of the magnetron WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUM The micom controller controls the ON OFF time of rel...

Страница 12: ...f the excessive leakage The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance If the oven operates with the door open the service personne...

Страница 13: ...false reading may result if the operator s hand is between the handle and the probe When testing near a corner of the door keep the probe perpendicular to the surface making sure the probe is moved h...

Страница 14: ...start of the test The initial temperature T1 of the water is 10 2 C It is measured immediately before the water is added to the vessel After addition of the water to the vessel the load is immediately...

Страница 15: ...cing the door be sure to check that the primary switch monitor switch and secondary switch operate normally 2 After replacing the door check for microwave energy leakage with a survey meter Microwave...

Страница 16: ...the waveguide 4 Remove the magnetron from the waveguide NOTE 1 When removing the magnetron make it sure dome does not hit any adjacent parts or it may be damaged 2 When replacing the magnetron be sure...

Страница 17: ...1 Discharge the high voltage capacitor 2 Disconnect the leadwire from magnetron and high voltage capacitor 3 Remove the screws holding the high voltage transformer to the baseplate J FAN MOTOR ASSEMBL...

Страница 18: ...has been specially designed to stop microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage 2 MOUNTING OF THE PRIMARY MONITOR SECO...

Страница 19: ...ed meter should indicate an closed circuit When 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 D...

Страница 20: ...N COMPONENTS TEST PROCEDURE RESULTS HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 1 Measure the resistance Ohm meter scale Rx1 and Rx100 Primary winding Secondary winding Fi...

Страница 21: ...ure the resistance Ohm meter scale Rx10 000 Terminal to case Normal Momentarily indicates several ohms and then gradually returns to infinite Normal Infinite NOTE When testing the magnetron be sure to...

Страница 22: ...t the items as illustrated in Figure 2 This has the positive side of the battery connected to the cathode of the diode 3 The diode should be forward biased therefore a voltage reading of approximately...

Страница 23: ...R x 1 Measure the resistance Ohm meter scale R x 1 Check for continuity of the switch with a Multi meter Normal Abnormal NOTE If the fuse is blown check the primary the secondary and the monitor swit...

Страница 24: ...r several ohm Normal Approx 3 48 Kohm Abnormal Infinite or several ohm Normal Approx 2 93 Kohm Abnormal Infinite or several ohm Normal at room temperature 20 C 30 C Approx 255 Kohm RY 4 RY 2 Cooking S...

Страница 25: ...erted tightly Output power is too low Low AC input voltage Food temperature is too low Using metallic ware and allowing it to touch the oven wall Sparks occur Inconsistent intensity of microwave by th...

Страница 26: ...does not turn on after setting cooking cycle 11 Display time of day does not reappear when cooking is finished TROUBLE 1 The following visual conditions indicate a probable defective control circuit C...

Страница 27: ...f primary switch with door opened Disconnect one side of the wire lead connected from transformer to the high voltage capacitor and operate the unit Replace fuse Continuity Malfunction of secondary sw...

Страница 28: ...k continuity of primary switch Abnormal Abnormal Normal Defective fan motor Defective oven lamp Replace fan motor Replace oven lamp No continuity Continuity Defective primary switch Replace primary sw...

Страница 29: ...or Replace high voltage capacitor Check high vol tage capacitor Abnormal Defective magnetron Replace magnetron Check magnetron TROUBLE 5 No microwave oven operation even though oven lamp and fan motor...

Страница 30: ...y 4 or 6 of P C B assembly Check the convection heater element Abnormal Normal Defective Relay 4 or 6 Replace Relay 4 or 6 Abnormal Normal Defective convection heater Replace convection heater Check t...

Страница 31: ...DOOR PARTS CONTROL PANEL PARTS BASE PARTS INTERIOR PARTS OVEN CAVITY PARTS LATCH BOARD PARTS EXPLODED VIEW 6 1 INTRODUCTION MODEL 721 67902600 721 67903600 721 67909600 EV...

Страница 32: ...DOOR PARTS 6 2 1005 1004 1000 1382 1007 1006 W105 1013 1008 1009 1005 1381 1004 1000 1007 1006 W105 1013 1008 1009 EV For Model 721 67902 721 67909 For Model 721 67903...

Страница 33: ...CONTROLLER PARTS 6 3 2004 2000 2002 2006 W106 2381 2004 2006 W106 2381 EV For Model 721 67902 721 67909 For Model 721 67903...

Страница 34: ...OVEN CAVITY PARTS 6 4 3001 W108 W107 W118 W119 W118 W107 3048 3002 3008 W105 3009 3012 3000 W103 For Model 721 67903 721 67909 For Model 721 67902 EV...

Страница 35: ...LATCH BOARD PARTS 6 5 W102 4000 4001 4002 4004 4003 4002 W117 4002 W109 W109 W105 5015 5006 5045 5028 3049 EV...

Страница 36: ...W101 W101 5014 5009 W109 5018 W101 5002 5000 5001 W177 W108 5408 5405 5021 W121 5010 5401 5402 5413 5406 3036 W121 5404 5041 5012 5003 5007 W146 W123 W182 W125 W141 W124 5019 W132 3207 3206 W121 5403...

Страница 37: ...BASE PLATE PARTS 6 7 6001 5008 6000 6007 W108 W101 6017 EV...

Страница 38: ...SENSOR PARTS 6 8 5011 5004 5016 W108 W104 EV...

Страница 39: ...P NO MFL06275102...

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