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1
2
3

TURNTABLE
MOTOR
(Wire leads removed)

SENSOR

NOTE : • A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY

REASON.

• MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.

• WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT THE WIRES.

FAN MOTOR
(Wire leads removed)

Measure the resistance.
(Select the

Ω

scale on the meter)

1) Disconnect sensor connector from micom

computer board.

2) Measure resistance terminal to terminal

(ohm meter scale: R X 1000)

Measure the resistance.
(Select the

Ω

scale on the meter)

Normal: Approx. 65 ~ 80 ohm
Abnormal: Infinite or several

ohm.

Normal: Approx. 2 ~ 4K 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 several.

* Sensor cooking condition
1. Oven should be plugged in at least 5

minutes before sensor cooking.

2. Room temperature should not exceed

95°F .

3. Be sure the exterior of the cooking

container and the interior of the oven
are dry. Wipe each off with paper towel.

4. The oven will not generate microwave

energy for the first 28 seconds of the
sensor cooking cycle.

COMPONENTS

TEST PROCEDURE

RESULTS

B. CHECKOUT PROCEDURES

(1) CHECKOUT PROCEDURES FOR FUSE BLOWING

CAUTION:

REPLACE BLOWN FUSE WITH 20 AMPERE FUSE.

NOTES:

- If the fuse is blown by an improper switch operation, replace the defective switches and the fuse at the same time. After

replacing the defective switches with new ones, make sure that they are correctly connected.

- Check for microwave energy leakage according to “1. ADJUSTMENT PROCEDURES” on page 3, when the primary,

secondary interlock switches and/or the interlock monitor switch are adjusted or replaced.

Fuse blows immediately after
the door is closed.

Fuse blows immediately after
the door is opened.

Fuse blows when the door is closed and
START key is touched.

Improper operation of the primary, secondary interlock switches and/or the
interlock monitor switch.

Malfunction of the high voltage transformer; the high voltage capacitor
including the diode, the magnetron, the blower motor or the circuit board.

PROBLEMS

CAUSES

-24-

Содержание 721.62342200

Страница 1: ...IC FIELD MANUAL FOR MICROWAVE OVEN MODEL 721 62342200 721 62342201 721 62342202 721 62342203 721 62349200 721 62349201 721 62349202 721 62349203 721 62344300 721 62344301 May 2005 MODEL 721 62342 721...

Страница 2: ...per 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 repaired or adj...

Страница 3: ...Adjustment Procedures 3 2 Precautions on Installation 5 3 General Precautions in Use 5 4 Trial Operation 5 5 Specifications 6 6 Overall Circuit Diagram 7 9 7 Operating Procedures 10 12 8 Procedure for...

Страница 4: ...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 upwar...

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

Страница 6: ...avity 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 the secondary interlo...

Страница 7: ...rlock Switch Interlock Monitor Magnetron 2M246 050GF High Voltage Capacitor Capacitor 0 95 F 2 1KV Ac High Voltage Diode 350mA 9 0KV Cavity Lamp 125V 20W Timer Digital up to 99 mm 99 sec in each cooki...

Страница 8: ...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 SCHEMATIC DIAGRAM THE VALUES OF COMPONEN...

Страница 9: ...FOR PROTECTION FROM MICROWAVE RADIATION FIRE ELECTRICAL SHOCK AND HAZARDS WHEN SERVICING IT IS ESSENTIAL THAT ONLY MANUFACTURER S SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED ARE...

Страница 10: ...9 B MATRIX CIRCUIT FOR TOUCH KEY BOARD Figure 4...

Страница 11: ...7 OPERATING PROCEDURES A OVEN CONTROL PANEL NOTE A beep sounds when you touch a key on the control panel to indicate that you have entered a setting 10 Figure 5 7 8 9 10 11 3 4 5 6 2 1...

Страница 12: ...s 4 NUMBER PADS Touch Number Pads to enter cooking time power level quantities or weights 5 COOK TIME Touch this pad to set a cooking time 6 STOP CLEAR Touch this pad to stop the oven or clear entries...

Страница 13: ...time 4 Touch POWER 5 Touch number for cooking power level 6 Touch START 6 MULTI STAGE COOKING 1 Touch STOP CLEAR 2 Touch COOK TIME 3 Touch numbers for cooking time 4 Touch POWER 5 Touch number for coo...

Страница 14: ...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 15: ...information on 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...

Страница 16: ...s 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 CONTROL CIRCUIT B...

Страница 17: ...mary switch monitor switch and secondary switch operate normally 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 s...

Страница 18: ...eter around the magnetron Microwave energy must be below the limit of 5 mW cm2 With a 275 ml water load Make sure that gasket is rigidly attached to the magnetron To prevent microwave leakage tighten...

Страница 19: ...ction guide ass y G HIGH VOLTAGE TRANSFORMER REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the wire lead from the magnetron the high voltage transformer and the capacitor 3 Remove the sc...

Страница 20: ...CHANISM The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting...

Страница 21: ...6 FA 63 OR VP 533A OF FOR SECONDARY SWITCH B SECONDARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary switch Connect the ohmmeter leads to the common COM and normally open NO termin...

Страница 22: ...VEN HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 1 Measure the resistance Select the scale on the meter Primary winding Secondary winding Filament winding 2 Measure the res...

Страница 23: ...the items as illustrated in figures Terminal to terminal Terminal to case Check for continuity of relay 2 with an ohm meter Remove wire leads from relay 2 and operate the unit POWER LEVEL 1 2 3 4 5 6...

Страница 24: ...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 4 7 VDC to 6 4 VDC will be read dep...

Страница 25: ...tainer and the interior of the oven are dry Wipe each off with paper towel 4 The oven will not generate microwave energy for the first 28 seconds of the sensor cooking cycle COMPONENTS TEST PROCEDURE...

Страница 26: ...ector of I O CON from the circuit board Does the unit still operate Replace the circuit board NO YES NO PROBLEM B FAN motor and oven lamp turn on When the door is closed and START key is touched GOOD...

Страница 27: ...ormal relay continuously operates 3 The buzzer does not sound or continues to sound NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON 4 Some segmen...

Страница 28: ...charge any static charge built up in your body Micom model only 27 CONDITION Microwave oven does not work Inserting many plugs into one outlet and using them at the same time blown fuse or breaker Mic...

Страница 29: ...me while counting down 9 Display counts down too fast while cooking 10 Each indicator light does not turn on after setting cooking cycle 11 Display time of day does not reappear when cooking is finish...

Страница 30: ...No continuity Normal Defective high voltage capacitor Replace high voltage capacitor Fuse blows again Defective high volt age transformer Replace high volt age transformer Malfunction of the monitor s...

Страница 31: ...Replace oven lamp Loose connection Connect them tightly CONDITION CHECK RESULT CAUSE REMEDY Output is low Lower than 90 of rating voltage Normal Normal Abnormal Abnormal Measure the output power Disco...

Страница 32: ...capacitor Replace high voltage capacitor Check high vol tage capacitor Abnormal Defective magnetron Replace magnetron Check magnetron TROUBLE 5 No microwave oscillation even though oven lamp and fan m...

Страница 33: ...LATE PARTS OVEN CAVITY PARTS LATCH BOARD PARTS INTERIOR PARTS SENSOR PARTS EV EXPLODED VIEW INTRODUCTION Model 721 62342200 721 62342201 721 62342202 721 62342203 721 62349200 721 62349201 721 6234920...

Страница 34: ...33 1001 1000 1004 1002 1006 1007 1005 1003 EV DOOR PARTS...

Страница 35: ...34 2000 2002 2001 2006 W106 2004 2381 EV CONTROL PANEL PARTS...

Страница 36: ...35 3034 3003 W105 3009 3002 3008 3001 W103 W118 EV OVEN CAVITY PARTS...

Страница 37: ...36 W102 4003 5015 4002 4002 4000 EV LATCH BOARD PARTS...

Страница 38: ...1 W208 5007 5009 Check the Model No Check the Model No Check the Model No Check the Model No EV INTERIOR PARTS I Model 721 62342200 721 62342201 721 62342202 721 62349200 721 62349201 721 62349202 721...

Страница 39: ...0 5002 W208 5018 W109 W101 W208 5007 5009 Check the Model No Check the Model No Check the Model No Check the Model No EV INTERIOR PARTS II Model 721 62342203 721 62349203 721 62344301 Check the rating...

Страница 40: ...39 W101 W108 6007 5008 6000 6001 9000 EV BASE PLATE PARTS...

Страница 41: ...40 W136 5011 5004 W108 EV SENSOR PARTS...

Страница 42: ...P NO 3828W5S5231 Printed in Korea...

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