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SCHEMATIC DIAGRAM (II)

*Check the Model No. (ADD Noise filter)

H.V.DIODE

THERMOSTAT

M.G.T

THERMOSTAT

OVEN

SECONDARY
SWITCH

H.V.

O.L

PRIMARY
SWITCH

RS.

RC.

F.M

T.T.M

MONITOR

SWITCH

TRANSFORMER

H.V.

V.M

CAPACITOR

C.L

S.M

HIGH

CONDENSER

THERMISTOR

ABSOLUTE
HUMIDITY
SENSOR

CN1

CN4

RY2
POWER
RELAY

1 2 3 4 5 6

TAP

7 PIN CONNECTOR(CN1)

3 PIN CONNECTOR(CN4)

CONTROL MODULE

WIRE COLORS

3 PIN(CN7)

CONNECTOR

(FOR SENSOR)

CN7

3 2 1

RY15
3 TAP
POWER
RELAY

SCR1
VENT
FAN
5 LVL

RY11

FAN
MOTOR
RELAY

RY6

VENT
FAN
ON/OFF
RELAY

SCR2
C/TOP
LAMP
5 LVL

RY14
C/TOP
LAMP
ON/OFF
RELAY

RY1
MAIN
RELAY

L.V.
TRANS-
FORMER

MAGNETRON

Summary of Contents for 721.80802400

Page 1: ...22 BASIC FIELD MANUAL FOR MICROWAVE OVEN MODEL 721 80802400 721 80802401 721 80809400 721 80809401 721 80804400 721 80804401 721 80803400 721 80803401 June 2005 MODEL 721 80802 721 80809 721 80804 72...

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: ...S FEATURES 6 1 SERVICE INFORMATION 7 1 PRECAUTIONS AND REPAIR SERVICE TIPS 7 1 MICROWAVE LEAKAGE TEST 7 2 POWER OUTPUT MEASUREMENT 7 3 DISASSEMBLY INSTRUCTIONS 7 4 INTERLOCK SYSTEM 7 12 INTERLOCK CONT...

Page 4: ...Monitor Switch Magnetron 2M282J Toshiba Cook top Lamp 120 V 20 W Halogen Cavity Lamp 120 V 20 W Halogen Timer Digital up to 99 min in each cooking stage Tray Tempered Safety Glass Overall Dimensions...

Page 5: ...operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron Unlike other appliances the...

Page 6: ...unded at all times In the event of an electrical short circuit grounding reduces the risk of electrical shock The plug must be plugged into an outlet that is properly installed and grounded BEFORE YOU...

Page 7: ...CONTROL PANEL 4 1 OPERATING INSTRUCTIONS MAIN MENU Cook Reheat Defrost Soften Melt Favorites Options 1 2 3 5 6 8 10 4 7 9 11...

Page 8: ...to cook retouch start 4 STOP CLEAR Touch this pad to stop and cancel any oven function 5 MANUAL COOK Touch this pad for manual control of cook time and power level The Stop Clear pad can also be used...

Page 9: ...OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM I Check the Model No 5 1...

Page 10: ...RD BK RD RD BK BL BL BK BK BK BN RD BL WH WH WH WH WH YL YL YL PK BL 1 2 3 1 2 3 5 CN1 CN4 RY2 POWER RELAY 1 2 3 4 5 6 1 2 3 4 5 6 1 2 1 2 6 7 TAP 3 TAP 2 1 TAP 4 YL RD BK BN BL WH BK RD WH 7 PIN CON...

Page 11: ...5 3 MATRIX CIRCUIT FOR TOUCH KEY BOARD Start Enter Popcorn Clock Light Add 30 Stop Clear Manual Cook Vent N C N C Kitchen Timer 6 7 5 1 2 3 4...

Page 12: ...t will begin cooking and the display window will 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...

Page 13: ...ll 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 exist The unit must not...

Page 14: ...ity of the microwave radiation leakage emitted by the microwave oven should not exceed 1mW cm sq And always start measuring of an unknown field to assure safety for operating personnel from radiation...

Page 15: ...e been used 3 At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer 1 Microwave power output measurement is made with the microwave oven supp...

Page 16: ...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 and sensor wire leads from the circuit board 4 Remo...

Page 17: ...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 NOTE Whe...

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

Page 19: ...atch Board Secondary Interlock Switch Interlock Monitor Switch Interlock Switch Primary Latch Board WH from Transformer YL from Turntable Motor PK from Cooktop lamp BL from Oven Thermostat Secondary I...

Page 20: ...When removing the magnetron make sure that its dome does not hit any adjacent parts or it may be damaged When replacing the magnetron be sure to install the magnetron gasket in the correct position a...

Page 21: ...the primary interlock switch the secondary interlock switch and the interlock monitor switch is in good operating normally After replacing the door check for microwave energy leakage with a survey me...

Page 22: ...es may leak from the clearance between the door and the oven I REMOVING THE VENTILATION MOTOR 1 Remove the mounting plate by loosening mounting plate screws 1 or 2 screws securing it to the back plate...

Page 23: ...le motor terminals 5 Remove the 1 screws securing the turntable motor to the oven cavity ASS Y Figure 21 NOTES Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connecto...

Page 24: ...ustment of the latch board may not be necessary Go to Steps 5 and 6 to check the sequence of the switches NOTE To correct sequence of the Primary Interlock Switch Secondary Interlock Switch and the In...

Page 25: ...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 26: ...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 Disconnect the wire lead from the monitor sw...

Page 27: ...ads 2 Measure resistance ohm meter scale Rx1 Primary winding High Low Secondary winding Filament winding 3 Measure resistance ohm meter scale Rx1000 Primary winding to ground Filament winding to groun...

Page 28: ...e 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 leve...

Page 29: ...Remove lead wires 2 Measure resistance ohm meter scale Rx1 1 Remove wire leads 2 Measure resistance ohm meter scale Rx1000 VENTILATION MOTOR TURNTABLE MOTOR 1 Disconnect sensor connector from micom c...

Page 30: ...he plastic fastener MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON NOTES A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE IN...

Page 31: ...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 32: ...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 33: ...the high voltage Systems the interlock switches the door sensing and the relay check good 3 The unit with a normal relay continuously operates 4 The buzzer does not sound or continues to sound 5 Some...

Page 34: ...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 Runs Runs 0 120 0 120 120V Replace circuit board Norm...

Page 35: ...rrect seating Normal circuit board Normal contact Poor Normal Secondary switch No continuity Adjust or replace door sensing switch Runs Runs Runs Check operation of fan motor when START key is touched...

Page 36: ...rmal circuit board Contact OK Normal contact Correct seating Check contact of connector Check the contact of relay 7 see page 7 16 Resistance incorrect Check the continuity of H V C see page 7 16 Norm...

Page 37: ...VENT ON OFF key is touched 1 Runs Runs Runs Contact OK NO contact Replace magnetron thermostat and oven thermostat Poor contact Replace circuit board Normal circuit board Contact OK Normal contact Cor...

Page 38: ...DOOR PARTS Model 721 80802400 721 80802401 721 80809400 721 80809401 721 80804400 721 80804401 721 80803400 721 80803401 8 1 1005 1381 FOR 721 80803 ONLY 1382 1008 1000 1002 1004 W171 1007 1006 1011...

Page 39: ...8 2 CONTROLLER PARTS 2000 2002 2381 2008 2006 2004 W130 2400 07 2381 2008 2006 2004 W130 2400 07 EV For Model 721 80802 721 80809 721 80804 For Model 721 80803...

Page 40: ...CAVITY PARTS W138 W142 3024 W138 W142 3010 W138 W142 3031 W109 W138 W142 3001 3029 3003 3032 3045 W178 W202 3005 3037 W121 3025 3011 3026 3036 6000 3018 FOR 721 80802 721 80804 FOR 721 80803 721 80809...

Page 41: ...8 4 LATCH BOARD PARTS 4000 W102 4001 4002 4003 4002 4004 EV...

Page 42: ...8 5 INTERIOR PARTS I 3002 3381 5058 5043 3004 5044 W105 3009 W109 3007 5035 W109 W109 W109 5412 5009 5023 5018 5049 5002 5000 W109 5007 5003 5012 W110 W109 5008 W101 Back 5024 EV...

Page 43: ...5017 5010 5014 5029 5006 5037 5056 W144 5015 5045 Check the Model No Check the Model No 3033 Check the rating label of Model and order SVC parts according to the Model No 8 6 INTERIOR PARTS II I Mode...

Page 44: ...10 5014 5029 5006 5037 5056 W144 5015 5045 Check the Model No Check the Model No W144 W144 3033 8 7 Check the rating label of Model and order SVC parts according to the Model No INTERIOR PARTS II II M...

Page 45: ...8 8 INSTALLATION PARTS 6008 6011 6010 6009 VINYL BAG EV...

Page 46: ...P NO 3828W5S4602 Printed in Korea...

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