Sears 721.88509800 Spécifications

삼 흥정 판DIVISION 22BASIC FIELD MANUALFORMICROWAVE HOOD COMBINATIONMODEL 721.88502800721.88503800721.88509800June, 2008MODEL 721.88502721.88503721.88509

5-2MATRIX CIRCUIT FOR TOUCH KEY BOARD

6-1GENERAL INFORMATION FOR SERVICEGENERAL PRECAUTIONS IN USEA. Never operate the unit when it is empty. Operatingthe oven with no load may shorten the

7-1SERVICE INFORMATIONPRELIMINARYA. SINCE NEARLY 4000 VOLTS EXISTS IN SOMECIRCUITS OF THIS UNIT REPAIRS SHOULD BECARRIED OUT WITH GREAT CARE.The filam

7-2MICROWAVE LEAKAGE TESTCAUTIONS• Be sure to check microwave leakage prior toservicing the oven if the oven is operative prior toservicing.• The serv

7-3MEASUREMENT WITH THE OUTER CASEREMOVED(1) When you replace the magnetron, measure formicrowave energy leakage before the outer caseis installed an

7-4DISASSEMBLY INSTRUCTIONSIMPORTANT NOTES:UNIT MUST BE DISCONNECTED FROM ELEC-TRICAL OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS, ADJUSTMENTS AND CONTI

7-5HOW TO REMOVE THE F.P.C. CONNECTORFollow the steps below as illustrated in Figures 4and 5 to remove the F.P.C. connector.(1) Hold the edges of the

7-6B. REMOVING THE OUT CASE(Figure 8)(1) Remove the vent grille by removing two screwssecuring it to the out case.(2) Remove two screws securing it

7-7C REMOVING THE DOOR INTERLOCKSWITCHES (Figures 9,10)(1) Disconnect the wire leads from the interlockswitches.(2) Remove two screws securing the

7-8D. REMOVING MAGNETRON(Figures 11 Through 12)(1) Remove the vent grille by loosening two screws.(Figure 11)(2) Remove the outcase. See page 7-6.(

CAUTIONWARNING TO SERVICE TECHNICIANSPRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLE EXPOSURETO EXCESSIVE MICROWAVE ENERGYa. D

7-9E. REMOVING STIRRER FAN(Figures 13 and 14)(1) Remove two screws securing it to the ovenupper plate.(2) Pull out the stirrer fan cover.(3) Remov

7-10H. ASSEMBLING DOOR(1) When mounting the door assembly to the ovenassembly, be sure to adjust the door assembly parallelto the chassis. Also adjust

7-11J. REMOVING THE TURNTABLE MOTOR(1) Remove the glass tray and rotating ring.(2) Remove the turntable shaft VERY CAREFULLYby hand. (Figure 19)(3) Re

7-12INTERLOCK MECHANISMThe door lock mechanism is a device which has been specially designed to eliminate completely microwaveactivity when the door i

7-13TEST THE LATCH AND SWITCH SEQUENCE(5) Open the oven door slowly. Watch the door latch,the Secondary Switch. Release Rod and Leveron the switches

7-14A. PRIMARY INTERLOCK SWITCH TESTWhen the door is opened slowly,an audible clickshould be heard at the same time or successivelyat intervals and th

7-15TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTINGCAUTIONS1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASEFROM T

7-16COMPONENTS TEST RESULTSNormal:Momently indicatesseveral ohm, and thengradually returns to infiniteNormal: Infinite.Normal:Continuity.Abnormal: Inf

7-17COMPONENTS TEST RESULTSNormal:Approximately 20 to 40 ohmsAbnormal:InfiniteNormal: Approximately2.0 to 3.0 KohmsAbnormal:Infinite or several.Normal

7-18COMPONENTS TEST PROCEDURES RESULTSMeasure the resistance between terminalpins of connector KEY CONNECTOR.NOTE:When reconnecting the FPC connector

FOREWORDRead this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposingyourself to the Microwave Ene

7-19B. CHECKOUT PROCEDURES(1) CHECKOUT PROCEDURES FOR FUSE BLOWINGCAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE.NOTES:• If the fuse is blown by

7-20(2)CHECKOUT PROCEDURES FOR RELAY.-PROBLEM (A)-FAN motor turns on without touching START keywhen the door is closed.-PROBLEM (B)-FAN motor turns on

7-21(3) CHECKOUT PROCEDURES FOR CIRCUITBOARDThe following symptoms indicate a defective circuitboard.1) Check the input current.If the input current

7-22C. TROUBLE SHOOTINGBefore following this troubleshooting read TRIAL OPERATION on page 6- 1.• DISPLAY Problems, A thru C• HELP UP Problems, D thru

7-23PROBLEM - E: Display does not start countdown when START key is touched.Check: 1. TOUCH KEY BOARD (START KEY FUNCTION)Check: 1. AIR VENTSPROBLEM -

7-24PROBLEM - E: Unit does not heat up even if display counts down whenSTART key is touched for HIGH POWER cooking.Check: 1. PRIMARY AND SECONDARY INT

7-25PROBLEM - F: No buzzing when touching the key, betweenstages or at end of cooking1PROBLEM - G: Ventilation fan does not operate when VENT ON/OFF k

-8-1-EXPLODED VIEWDOOR PARTS (I)10051382100810001004100710061011W109W1711009#EV#FOR MODELS:

-8-3-CONTROLLER PARTS (I)2030MBM220092041W136200420062400202120002002238120082007W130W136#EV#FOR MODELS:

-8-5-OVEN CAVITY PARTS303130013005302630253011301860006009303630373029310230325382301030243003W109W178W202W121W142W142W1429000#EV#

1-1SPECIFICATIONSRated Power Consumption ...1750W maximum (Microwave oven+Cook top lamps+Ventilation fan)Microwave Outpu

-8-6-LATCH BOARD PARTS4000W10240014002400340024004#EV#

-8-7-INTERIOR PARTS (I)30023381BackRoller part is Tray Assembly Included.500350075012500850493009W105W1735051300750235009500250005018W108W108W109W109W

-8-8-INTERIOR PARTS (II)W150W15057073027504150275011501450105037502950065016W144W10950015412W178504553825800W2023005#EV#

-8-9-INSTALLATION PARTS6008601160096010MFL1USE & CAREMEZ1COOKING GUIDE LABELMBM4TEMPLATEUPPERMBM5TEMPLATEWALLMFL3INSTALLATIONMANUAL#EV#

POWER OUTPUT MEASUREMENT(A) 1. Fill two test bowls with 59°F(15°C) ~ 75°F(24°C) 1 liter water respectively.2. Use accurate thermometer ( °F or °C) and

Part No.: 3840W1T147B10-4Part No.: 3840W1T147B10-5Part No.: 3840W1T147B10-6High voltage componentsComponents Test ResultsNormal: Less than 1 ohmAbnorm

Complete the following steps before checking microwave circuitry:1. Check the line voltage, household fuse or circuit breaker.2. Check for loose wirin

P/NO : MFL57016001 Printed in Korea

2-1CAUTIONSUnlike other appliances,the microwave oven ishigh-voltage and high-current equipment.Though it is free from danger in ordinary use,extreme

3-1INSTALLATIONSBEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.PRECAUTIONS ON INSTALLATIONA. Plug the power supply cord in

4-1OPERATING INSTRUCTIONSCONTROL PANEL1264593781210111513171614201819

4-2CONTROL PANEL INSTRUCTIONS1. Display Screen shows the time of day and cook modewhen the microwave oven is not in use. Duringprogramming, it display

5-1OVERALL CIRCUIT DIAGRAMSCHEMATIC DIAGRAM