Sears Microwave Oven Service Manual Page 1

TECHNICAL FLASHT.F. 22-480Department 731A TorontoBASIC SERVICE MANUALFORMICROWAVE OVENMODEL 767.8541000 / 767.8541001767.8541300 / 767.8541301767.8541

5-2MATRIX CIRCUIT FOR TOUCH KEY BOARD

GENERAL PRECAUTIONS IN USEA. Never operate the unit when it is empty.Operating the oven with no load may shorten thelife of the magnetron. Whenever co

PRELIMINARYA. SINCE NEARLY 2,100 VOLTS EXISTS IN SOMECIRCUITS OF THIS UNIT REPAIRS SHOULD BECARRIED OUT WITH GREAT CARE.The filament leads of magnetro

CAUTIONS• Be sure to check microwave leakage prior toservicing the oven if the oven is operative prior toservicing.• The service personnel should info

MEASUREMENT WITH THE OUTER CASEREMOVED(1) When you replace the magnetron, measure formicrowave energy leakage before the outer caseis installed and a

IMPORTANT NOTES:UNIT MUST BE DISCONNECTED FROM ELEC-TRICAL OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS, ADJUSTMENTS AND CONTIN-UITY CHECKS. WAIT AT LEAS

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

B. 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 to th

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

D. REMOVING MAGNETRON(Figures 11 Through 13)(1) Remove vertgrille.(2) Remove mount all.(3) Remove outcase.(4) Discinnect the wireleads.(5) Remove the

CAUTIONSAFETY PRECAUTIONSPRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLE EXPOSURETO EXCESSIVE MICROWAVE ENERGYa. Do not operat

E. REMOVING STIRRER FAN(Figures 14 and 15)(1) Remove one rivet ASS'Y securing it to the ovenupper plate by using knife blade.(2) Rotate slightly

H. ASSEMBLING DOOR(1) When mounting the door assembly to the ovenassembly, be sure to adjust the door assemblyparallel to the chassis. Also adjust so

J. REMOVING THE TURNTABLE MOTOR(1) Remove the turntable.(2) Remove the turntable shaft VERY CAREFULLYwith a slotted screwdriver. (Figure 21)(3) Remove

ADJUSTMENT PROCEDURESTo avoid possible exposure to microwave energyleakage, adjust the door latches and interlockswitches, using the following procedu

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

A. PRIMARY INTERLOCK SWITCH TESTWhen the door is opened slowly, an audible click should be heard at the same time or successivelyat intervals and the

7-15TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTINGA. TEST PROCEDURES- CAUTIONS -- DISCONNECT THE POWER SUPPLY CORDFROM THE WALL OUTLET WHENEVERREM

7-16COMPONENTS TEST PROCEDURES RESULTSHIGH-VOLTAGECAPACITORHIGH-VOLTAGEDIODEMeasure the resistance: (1) Terminal to terminal(2) Terminal to caseMeasu

7-17COMPONENTS TEST PROCEDURES RESULTSTOUCH KEYBOARDSENSOR(For sensor model only)Measure the resistance between terminalpins of connector KEY CONNECT

NOTES:• A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FORANY REASON.• MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITIO

TABLE OF CONTENTS(Page)SAFETY PRECAUTIONS ...

7-19(2) CHECKOUT PROCEDURES FOR RELAY.- PROBLEM (A) -T.T. motor and oven lamp turn on without touchingSTART key when the door is closed.Remove the mat

(3) CHECKOUT PROCEDURES FOR CIRCUITBOARDThe following symptoms indicate a defective circuitboard.1) The start function fails to operate but the highvo

7-21C. TROUBLE SHOOTINGBefore following this troubleshooting read “TRIAL OPERATION” on page 6- 1.• “DISPLAY” Problems, “A” thru “C”• “HELP UP” Problem

7-22PROBLEM - C: Unit does not heat up even if display counts down whenSTART key is touched for "HIGH POWER" cooking.Check: 1. PRIMARY AND

7-23PROBLEM - D: No buzzing when touching the key, betweenstages or at end of cooking1lamroNdraob tiucriclamron kcehCnoitarepodraob tiucricecalpeRdrao

7-24PROBLEM - G: Ventilation fan does not operate when “FAN HIGH/ LOW” key is touched.1snuRsnuRsnuRsnuRtcatnoCKOONtcatnocecalpeRtatsomreht nevo tcatno

8-1EXPLODED VIEWDOOR PARTS13581A13552A13536A13213A14890A13650A14970A14026AWTT02813551AFor Model767.8541313720D14760A#EV#

8-2CONTROLLER PARTSFor Model: 767.85410767.85419For Model: 767.8541324810P*0726871124781MWTP01823551A24810P23572A23506A*0726871124781MWTP01823551A#EV#

36912C35026G63302AWTT022WTT02833112U368771WTT029WTT02734810T33530A34890CWTT010WTT02235230A63303A34810Q34960AWTT021*02*01*04*0534930R33550LFor Model767

46600143500A46600346600144510A43501AWSZ0858-4LATCH BOARD PARTS#EV#

1-1Rated Power Consumption ----------------------------------1500W maximum (Microwave oven+Cook top lamps+Ventilation fan)Microwave Output------------

8-5INTERIOR PARTS(I)56170D33390G34370T35889AWTP013WTP01554810C50CZZHWSZ00256851DWTT021WSZ00233052A53300B56324AWSZ00256201BWTT02136549S33740A53300AWTT0

36549V56912B53550L55262A55231C56804AWTT028WSZ00256930V50FZZA56877154930F55892A53550F34051156411A56201AWSZ0028-6INTERIOR PARTS(II)#EV#

8-7INSTALLATION PARTS63300M65862D65862BVINYLBAG63861A#EV#

8-8REPLACEMENT PARTS LISTFor Model: 767.85410 I/C : INTERCHANGEBILITY CODE Mar. 29. 2005*01 MANUAL,OWNERS 3828W5A4048 → 3828W5A8142 R*02 MANUAL,SERVIC

8-9466003 SWITCH,MICRO 3B73361E → 6600W1K001C R 6600W1K003C466003 SWITCH,MICRO 3B73361E → 6600W1K001C R 6600W1K004B50CZZH CAPACITOR,DRAWING[HIGH VOLTA

8-10For Model: 767.85413 I/C : INTERCHANGEBILITY CODE Mar. 29. 2005*01 MANUAL,OWNERS 3828W5A4048 → 3828W5A8142 R*02 MANUAL,SERVICE 3828W5S3674 → 3828W

8-1150CZZH CAPACITOR,DRAWING[HIGH VOLTAGE] 0CZZW1H004B 0CZZW1H004B R 0CZZW1H004G50CZZH CAPACITOR,DRAWING[HIGH VOLTAGE] 0CZZW1H004B 0CZZW1H004B R 0CZZW

8-12For Model: 767.85419 I/C : INTERCHANGEBILITY CODE Mar. 29. 2005*01 MANUAL,OWNERS 3828W5A4048 → 3828W5A8142 R*02 MANUAL,SERVICE 3828W5S3674 → 3828W

8-13466003 SWITCH,MICRO 3B73361E → 6600W1K001C R 6600W1K003C466003 SWITCH,MICRO 3B73361E → 6600W1K001C R 6600W1K004B50CZZH CAPACITOR,DRAWING[HIGH VOLT

Printed in KoreaP/NO : 3828W5S5159

• DO NOT operate on a 2-wire extension cord duringrepair and use.• NEVER TOUCH any oven components or wiring duringoperation.• BEFORE TOUCHING any par

PRECAUTIONS ON INSTALLATIONA. Plug the power supply cord into a 120V AC, 60Hz,single-phase power source with a capacity of 15Aor 20A.B. Avoid placing

4-1OPERATING INSTRUCTIONSCONTROL PANELFor Model 85410

1. DISPLAY: The Display includes a clock and indicators totell you time of day, cooking time settings and cookingfunctions selected.2. POPCORN: Touch

5-1OVERALL CIRCUIT DIAGRAMSCHEMATIC DIAGRAM