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NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS

SERVICED FOR ANY REASON.

(3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD

The following symptoms indicate a defective circuit
board.
(1) The start function fails to operate but the high

voltage Systems, the interlock switches, the door
sensing and the relay check good.

(2) The unit with a normal relay continuously operates.
(3) The buzzer does not sound or continues to sound.

(4) Some segments of one or more digits do not light up, or

they continue to light up, or segments light when they
should not.

(6) Wrong figures appear.
(7) The figures of all digits flicker.
(8) Some of the indicators do no light up.
(9) The clock does not keep time properly.

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Содержание 721.66339

Страница 1: ...DIVISION 20 BASIC FIELD MANUAL FOR MICROWAVE OVEN MODEL 721 66339800 February 2008 MODEL 721 66339...

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: ...nstructions 13 17 10 Interlock Continuity Test 18 11 Test and Checkout Procedures and Troubleshooting A Test Procedures 19 21 B Checkout Procedures 22 24 C Troubleshooting 25 29 12 Exploded view 30 37...

Страница 4: ...o to step 3 and follow all steps in order ADJUST THE LATCH AND SWITCH CLOSING 3 Loosen the two screws holding the plastic latch board as shown 4 With the oven door closed tightly move the latch board...

Страница 5: ...4 LATCH LATCH BOARD 0 1 64 0 1 64 LATCH BOARD MONITOR INTERLOCK SWITCH PRIMARY INTERLOCK SWITCH A SECONDARY INTERLOCK SWITCH Figure 1 a Figure 1 b DOOR LATCH DOOR LATCH...

Страница 6: ...key Make sure the cavity light comes on The unit will begin cooking and the display window will show the time counting down by seconds E After about 5 minutes make sure the primary interlock switch t...

Страница 7: ...ry Interlock Switch Interlock Monitor Magnetron 2M246 High Voltage Capacitor Capacitor 1 05 F 2 1KV Ac High Voltage Diode 350mA 9 0KV Cavity Lamp 125V 20W Timer Digital up to 99 mm 99 sec in each cook...

Страница 8: ...L SHOCK AND HAZARDS WHEN SERVICING IT IS ESSENTIAL THAT ONLY MANUFACTURER S SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM NOTICE SINCE THIS IS BASIC...

Страница 9: ...B MATRIX CIRCUIT FOR TOUCH KEY BOARD 8 Figure 4...

Страница 10: ...t a cooking time 8 STOP CLEAR Touch this pad to stop the oven or clear entries 9 EXPRESS DEFROST This pad provides you with the quick defrosting method for 1 0 pound frozen foods 10 MELT Touch this pa...

Страница 11: ...Three different defrosting levels are provided Touch 1 Meat Touch 2 Poultry Touch 3 Fish 3 Enter the weight of your food in decimal increments from 0 1 to 6 0 pounds 4 Touch START 5 At beeping turn fo...

Страница 12: ...q And always start measuring of an unknown field to assure safety for operating personnel from radiation leakage NOTE The standard is 5mW cm sq while in the customer s home 1mW cm sq stated here is ma...

Страница 13: ...the service invoice 2 Should the microwave energy leakage not be more than 1mW cm sq after determining that all parts are in good condition functioning properly and genuine replacement parts which ar...

Страница 14: ...TSIDE CASE Figures 8 1 Remove three screws from the rear section 2 Remove one screw from the side section 3 Push the outer case back about 1 inch 3cm 4 Lift the case from the set B REMOVING POWER AND...

Страница 15: ...2 After replacing the door check for microwave energy leakage with a survey meter Microwave energy must be below the limit of 5 mW cm sq with a 275 ml water load 3 When mounting the door assembly to...

Страница 16: ...ng screws properly making sure there is no gap between the waveguide and the magnetron E REMOVING THE TURNTABLE MOTOR 1 Remove the turntable and rotating ring 2 Lay the unit down on its back 3 Remove...

Страница 17: ...the the suction guide ASSEMBLY to the oven cavity 4 Remove the two screws holding the fan motor ASSEMBLY to the suction guide ASSEMBLY H HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL 1 Discharge the high v...

Страница 18: ...Mount the latch board to the oven assembly Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed Tighten the mounting screw Check for pl...

Страница 19: ...eter 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 Disco...

Страница 20: ...E TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 1 Measure the resistance Ohm meter scale Rx1 and Rx100 Primary winding Secondary winding Filament winding 2 Measure the resistance Ohm met...

Страница 21: ...Terminal to case Measure the continuity Forward Ohm meter scale Rx10000 Measure the continuity Reverse Ohm meter scale Rx10000 Normal Momentarily indicates several ohms and then gradually returns to i...

Страница 22: ...B Approx 10 25 ohm Abnormal Infinite or several ohm Normal Approx 100 150 ohm Abnormal Infinite or several ohm Normal Approximately BK RD 5 2 Kohm RD WH 2 1 Kohm BK WH 2 1 Kohm Abnormal Infinite or s...

Страница 23: ...Malfunction of the high voltage transformer the high voltage capacitor including the diode the magnetron the blower motor or the circuit board PROBLEMS CAUSES NOTES If the fuse is blown by an improper...

Страница 24: ...of I O CON from the circuit board does the unit still operate GOOD GOOD Replace the circuit board PROBLEM B FAN motor and oven lamp turn on When the door is closed and START key is touched Check the...

Страница 25: ...high voltage Systems the interlock switches the door sensing and the relay check good 2 The unit with a normal relay continuously operates 3 The buzzer does not sound or continues to sound 4 Some seg...

Страница 26: ...to discharge any static charge built up in your body Micom model only CONDITION Microwave oven does not work Inserting many plugs into one outlet and using them at the same time blown fuse or breaker...

Страница 27: ...ght 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 circu...

Страница 28: ...imary monitor switches and RELAY RY2 of P C B Assembly Check continuity of monitor switch with door closed Check continuity of primary switch with door opened Disconnect one side of the wire lead conn...

Страница 29: ...s all figures set but oven does not start cooking while desired program times are set and START pad is touched TROUBLE 4 Oven seems to be operating but little heat is produced in oven load NOTE Simple...

Страница 30: ...2 and check continuity relay 2 Operate the unit Abnormal Defective high voltage capacitor Replace high voltage capacitor Normal Check high vol tage capacitor Abnormal Defective high voltage diode Repl...

Страница 31: ...EXPLODED VIEW INTRODUCTION 30 DOOR CONTROL PANEL BASE PLATE OUTER CASE LATCH BOARD INTERIOR SENSOR EV...

Страница 32: ...31 DOOR PARTS 1004 1000 1005 1007 1006 1002 1013 1003 1001 EV...

Страница 33: ...32 CONTROLLER PARTS 2000 2002 2006 W106 2004 2381 EV...

Страница 34: ...33 OVEN CAVITY PARTS 3002 W107 W103 3001 3003 3008 3009 W105 3034 EV...

Страница 35: ...34 LATCH BOARD PARTS W102 4002 4003 4002 4004 4000 4001 EV...

Страница 36: ...EV 5014 5016 5010 5003 5012 W109 W208 W101 W109 5007 3006 W101 W110 5009 5006 W101 5015 9000 5000 5002 3007 5018 W109 W101 5001 5041 W208 35 INTERIOR PARTS...

Страница 37: ...36 BASE PLATE PARTS 5008 W101 W108 6000 6007 6001 EV...

Страница 38: ...37 SENSOR PARTS W136 5011 5004 W108 EV...

Страница 39: ...P NO MFL30502909 Printed in Korea...

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