Sears 721.62222300 Скачать руководство пользователя страница 31

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(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.

CONDITION

CHECK

RESULT

CAUSE

REMEDY

1.Setting time

does not count
down when
touching START
pad.

2. Fan motor or

oven lamp do
not turn on.

No continuity.

Continuity.

No continuity.

Check the con-
nection between
CN1 connector
and PCB
assembly.

Defective
secondary switch.

Replace
secondary switch.

Defective PCB
assembly.

Replace PCB
assembly.

Check continuity
of secondary
switch (with
door closed).

Check fan motor.

Check oven lamp.

Abnormal.

Normal.

Defective fan motor.

Defective oven lamp.

Replace fan motor.

Replace oven lamp.

Loose connection.

Connect them
tightly.

CONDITION

CHECK

RESULT

CAUSE

REMEDY

Output is low.

Lower than 90% of
rating voltage.

Normal.

Abnormal.

Measure the
output power.

Disconnect the
wire leads from
relay 2 and check
on and off time
with multitester.

Defective PCB
assembly.

Replace PCB
assembly.

Decrease in power
source voltage
with load.

Suggest customer
contact local
electric power
utility co. or
qualified
electrician.

Check the
power source
voltage.

Defective
magnetron.

Replace
magnetron.

NOTE :

Simple test of power output-conducted by heating one liter water for one min. if available.
Minimum 8.5°C temperature rise is normal condition.

(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired

program times are set and START pad is touched.

Содержание 721.62222300

Страница 1: ...DIVISION 20 BASIC FIELD MANUAL FOR MICROWAVE OVEN MODEL 721 62222300 721 62222301 721 62229300 721 62229301 May 2005 MODEL 721 62222 721 62229...

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: ...tment 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 Meas...

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: ...y Interlock 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...

Страница 8: ...6 OVERALL CIRCUIT DIAGRAM A I SCHEMATIC DIAGRAM Check the Model No 7...

Страница 9: ...8 A II SCHEMATIC DIAGRAM Check the Model No ADD Noise filter...

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 1 7 8 10 9 11 4 5 6 2 3...

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: ...e the two screws holding the fan motor assembly to the suction guide ass y G HIGH VOLTAGE TRANSFORMER REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the wire lead from the magnetron the h...

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: ...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 su...

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: ...32 DOOR PARTS CONTROL PANEL PARTS BASE PLATE PARTS OVEN CAVITY PARTS LATCH BOARD PARTS INTERIOR PARTS EV EXPLODED VIEW INTRODUCTION Model 721 62222300 721 62222301 721 62229300 721 62229301...

Страница 34: ...33 1003 1001 1000 1006 1007 1004 1005 1013 1002 EV DOOR PARTS...

Страница 35: ...34 2000 2002 2001 2381 2006 W106 2003 2005 2007 2004 2010 EV CONTROL PANEL PARTS...

Страница 36: ...35 W103 3001 3003 W107 3002 3009 W105 3034 3008 For Model 721 62229 For Model 721 62222 W118 EV OVEN CAVITY PARTS...

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

Страница 38: ...012 W109 W101 5007 5001 5016 5014 5005 W101 5010 5009 3006 Check the Model No Check the Model No Check the Model No Check the Model No 9000 EV INTERIOR PARTS I Model 721 62222300 721 62229300 Check th...

Страница 39: ...041 5012 W109 W208 5007 5001 5016 5014 W101 5010 5009 3006 Check the Model No Check the Model No Check the Model No Check the Model No 9000 EV INTERIOR PARTS II Model 721 62222301 721 62229301 Check t...

Страница 40: ...39 W101 6002 W109 W108 5008 6000 6001 9001 EV BASE PLATE PARTS...

Страница 41: ...P NO 3828W5S5230 Printed in Korea...

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