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Service Manual Microwave Oven Model

1. POWER SUPPLY SINGLE PHASE ONLY BOTTOM CAVITY N TCO TCO E 90 0 ES w CNS USE 800 oso fo m GY BK Rp RD RD RD a WH LA 1 de BL Ty 6 MAGNETRON TRANSFORMER 3 I E 150 60 BK 8 SUB RELAV ja 5i OR 5 R TRAY CM P MOTOR ON OFF EET l RELAY VENT BR m MOTOR _ 2 is VL 52 LOW RELAY n on b 3 VENT i ts 4 RUNNING LAMP YL CAPACITOR BR SWITCH VENT 4 MH BK UNDER MOTOR ied vat BL np L YL mes HIGH B RELAY 4 1 YL aj MOTOR 2 YL OR LAMP x gt LOW PRZE HIGH LAMP HIGH PRIMARY LOW RELAY INTERLOCK i NE SWITCH UPPER gt 1 CN3 CN2 M RD ET x INTERLOCK MONITOR Wa aj n BI SWITCH SENSOR SECONDARY Q0 KOT 150SONLY INTERLOCK KOT 1508 ONLY KOT 151S ONLY SWITCH UNDER 000 DA KOT 1558 ONLY MV NOTE DOOR IS OPEN T CO THERMAL CUT OUT T S THERMOSTAT VENT VENTILATION H V HIGH VOLTAGE L V LOW VOLTAGE SYM COLOR BR BROWN RD RED GY GRAY WH WHITE OR ORANGE BK BLACK GN GREEN BL BLUE YL YELLOW H V DIODE Zr MAGNETRON 42 2 CIRCUIT DESCRIPTION MICROWAVE COOKING TIME COOKING 1 When the food is placed inside the oven and door i
2. a a a WARNING Personal Injury Hazard Disconnect from the power supply before servicing Discharge the capacitor using a 20 000 W discharge resis tor or an insulated plastic handle screwdriver to short across the capacitor terminals Pu Ec 4 Remove the supporter and powercord See Fig 13 5 Remove the air guide top 6 Discharge the high voltage capacitor 7 Unplug the red wire connectors from the high voltage transformer 8 Remove the four mounting hex nuts from the magnetron Support the magnetron with one hand while you remove the screws with the other so that the magnetron does not fall as you remove it HEX NUT 4EA e 31 9 Mount the magnetron cover lamp to the new magnetron with its 1 mounting screw 10 Position the new magnetron so that the magnetron the cover lamp the front of the oven and mount the magnetron to the top of the chassis with its four mounting hex unts Make sure that vou tighten the nuts securelv 11 Connect the red high voltage leads to the magnetron terminals 12 Refer to Cabinet Installation and reinstall the Air guide top supporter powercord wire protector the cabinet control panel and the vent grille on the microwave 13 Reinstall the micowave oven in its mounting location RED RED FIG
3. 4 PCB CIRCUIT DIAGRAM VONZGL LOM U 10SU9S SHDd ou 8 9J9UL p OS TISEVTISE SOTN M W VONZGL LOM 20 05 PUD VOSG L OSL 1OM 104 LPS H8sul e WHO lt 8 WHO ML H lt 1Y 9010 1OJSISUDJI 104 Z G 920 S99UDJ9J0 PUD ym 9 940 S90UDJSIS9 POJJDWUN 107 z lt 310N gt 29 SW ki EE ZE 271 LE Dew s M m f WODNE aa AI n caz 13 I 93 42 693 LA SZ N YA wi _ p IA 610 widz dOLZ UNQ NVGD BBC M BLY mall you 18010 mf pm 678 1N GN AL x3 ira bud vr ga 078 1 20 ANN 1 L 3m18 zu ie 6 w AM zb Hd lt 44 4 IE 44 L f EA WA bare
4. U U U uuu 2 SPECIFICATIONS UITM E a i S u uz 3 EXTERNAL VIEW EE a ie 4 INSTALLATION iii i p at 4 OPERATIONS AND FUNCTIONS cicit 4 DISASSEMBLY AND ASSEMBLY niende aAA A E AA AeA AAA AA AA EA EA EE EAS AA SA EA EAA vaovaucsuerucseatestoviwes 5 TROUBLE SHOOTING GUID B i za z eerie I i ae aa 33 MEASUREMENT AND TEST ie sans 34 WIRING DIAGRAM a EE eae ar ae eee 42 PRINTED CIRCUM BOARD iii zz a AL aes acs EA L AL es BAG EA L AL see EL BE AL A eas Mie chs dus 46 EXPLODED VIEW AND PARTS LIST ii ciii wow tenester 61 PROPER USE AND SERVICE PRECAUTIONS 0 8 81 q CAUTION This Device is to be Serviced Only by Properly Qualified Service Personnel Consult the Service Manual for Proper Service Procedures to Assure Cotinued Safev Operation and for l Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energv l l 1 FOR SAFE OPERATION Damage that allows the microwave energv that cooks or heats the food to escape will result in poor cooking and mav cause serious bodilv injurv to the operator IF ANV OF THE FOLLOWING CONDITIONS EXIST OPERATOR MUST NOT USE THE APPLIANCE Only a trained service personnel should make repairs 1 A broken door hinge 2 A broken door viewing s
5. SCREW RED CONNECTOR WIRE PROTECTOR YELLOW CONNECTOR FIG 6 13 7 REPLACING ADJUSTING INTERLOCK SWITCHES i I WARNING Personal Injury Hazard Disconnect from the electrical before servicing the unit Failure to do so coud result in electrical shock or l other personal injury l A ZZO ej Ben FT TA REPLACING A SWITCH Interlock Switch Housing 2 Interlock screw FIG 7 1 Disconnect the electrical supply to the microwave oven 2 Remove the vent grille and the cabinet from the microwave oven See cabinet removal on FIG 1 3 Remove the screw from the center of wire protector 4 Remove the screw from the top center tab of the control panel See FIG 2 5 From the top and back of the control panel lift the top locking tab and Pull the top of the panel out slightly then lift the bottom tabs of the panel out of the slots and pull it forward Set the panel inside the oven cavity while you work Refer to FIG 7 for the following steps 6 Remove the two mounting screws from the interlock switch assembly and position the assembly so you can easily access the switches and wiring Refer to REMOVE SWITCH in FIG 7 1 for the interlock switches the interlock switch housing assembly and remove the switch from the housing as shown 8 One at a time pull the wire connectors off the defective switch and reconnect t
6. ZAJ CAUTION Personal Injury Heazard Because of the weight and size of the microwave oven two people are required to safely move and install it Failure to do so could result in personal injury l l l l L RR ih eh Ne eh SK SR ETG STE ETATEN STEGET l L 1 Remove the microwave oven from its mounting location 2 Remove the vent grille the wire protector and the cabinet from the microwave oven See Cabinet Removal Refer to FIG 16 and the inset for the following steps 3 Unplug the black and white power cord leads a a NOTE Disconnect the black lead by pressing in on the locking arm of the connector and pulling it loose I L ESSE 4 Remove the ground screw from the green power lead 5 Remove the old power cord 6 Raise the cover just enough to slide the new power cord strain relief block into the chassis slot 7 Connect the power cord lead to the wiring harness connector so the sections lock together 8 Route the green wire under the cover and mount the evelet to the chassis with the screw vou removed earlier 9 Refer to Cabinet Installation and reinstall the cabinet and the vent grille on the microwave oven 10 Reinstall the microwave oven in its mounting location 25 17 REPLACING THE HIGH VOLTAGE TRANSFORMER a a WARNING Personal Injurv
7. LINE FUSE RED LAMP SWITCH LINE FUSE BLACK PRIMARV INTERLOCK SWITCH RED BOTTOM THERMAL CUT OUT FIG 5 12 6 REPLACING THE VENT MOTOR CAPACITOR 1 8z WARNING Persona Injurv Hazard Disconnect from the electrical supplv before servicing the unit Failure to do so could result in electrical shock or other personal injurv _ __ _ ___ _______ _ _ ____________ ____________ CAUTION Persona Injurv Hazard Because of the weight and size of the microwave oven two people are required to safelv move and install it Failure to do so could result in personal injurv L l ETA L Remove the vent grille from the microwave oven See Cabinet Removal Remove the screw from the top center tab of the control panel See FIG 2 Remove the screw from the top center tab of wire protector Disconnect the two wire connectors from the vent motor capacitor terminals Remove the screw for vent motor capacitor and remove it then install a new capacitor in its place Reconnect the wires to the new vent motor capacitor terminals as shown in the FIG 6 Reinstall the control panel and the vent grille on the microwave oven
8. SEN 3 l RENT 1 66 0 ZAM 3 o MOTIBA sd es ky 21 GO0H 8 E apt IIIII mm 9 ti 1 pp zz aa THH fes v 19978 fo u Z YOLON INJA La 5 ER bool gt ki DG YWE LAN 0190 82292 CEN 61 f d s XUYOSI 64 zor j Tid est 91 94 PAM F NO g EJ Eu LI Tod B E ga th 91 tid LLU U eia Ta 0 11 tt m gl u 90d 94 s Bale Pe w 0 ocz giy 9 7 Bg EG mi w et Os B A 9X 7 Old m atid 6 WA cj du LYVd vid 6 L CO 9 YOSNIS p BLLO ZILGE LISNZO VANH NOMLISIG m NrLHOLSdAL 12 NO 0 1 0 YOSNIS ALIQINAH 190 GA 58 5 PCB LOCATION NO NAME SVMBOL SPECIFCATION PART CODE REMARK BUZZER 821 20 3515600100 CAPACITOR ARRAV CA1 6P 5 102 M 50V CN5XB 102M CAPACITOR CERAMIC C1 C2 C7 C8 C10 13 104 50V Z AXIAL CCZF1H104Z CAPACITOR CERAMIC C3 102 50V Z AXIAL CCZB1H102K KOT 150S 1515 1555 CAPACITOR CERAMIC 05 C6 C9 104 50 Z AXIAL CCZF1H104Z KOT 150S 1515 1555 CAPACITOR ELECTRO EC1 50V RS 10uF CEXE1H100A CAPACITOR ELECTRO EC2 EC3 35V RSS 200uF CEXF1V221V CAPACITOR ELECTRO EC4 50V RSS 1004uF CEXF1
9. 8 29 28 11 29 38 14 29 48 17 29 59 20 29 69 23 29 79 26 29 90 29 29 100 45 PRINTED CIRCUIT BOARD 1 CIRCUIT CHECK PROCEDURE 1 Low voltage transformer DMR 210P check The low voltage transformer is located on the PCB Measuring condition Input voltage 120 V Frequency 60Hz Terminal NO LOAD AC 3 1V 1 10 8 AC 20V i 7 3 6 NOTE Secondary side voltage of the low votage transformer changes in proportion to fluctuation of power source voltage NOTE The allowable tolerance of the secondary voltage is within 5 of normal voltage 2 Voltage Check KEY CHECK POINT CHECK POINT REMARK IC1 PIN 63 64 IC1 PIN 25 IC1 PIN 38 T 16 67ms 60Hz 5V IC1 PIN 33 OR 34 ETNE T T 250 ns DP1 PIN 1 2 amp 32 33 2 6 VAC DISPLAY FILAMENT VOLTAGE CHECK METHOD MEASURE POINT FIG 21 WAVE FORM REMEDY REMARK MP1 DC 5V 0 25 REPLACE Q5 EC1 C8 ZD4 NO LOAD MP2 DC 24V 1 0 REPLACE EC6 R28 D21 D24 NO LOAD MP3 DC 24V 1 0 REPLACE ZD3 ZD6 C7 EC4 NO LOAD NOTE Each measure point must be measured with GND points 46 3 Displav problems CAUSE MEASUREMENT RESULT REMEDV and displav filament amp PIN 32 33 Poor contact between PCB Check the voltage of PIN 1
10. Connect the wires to the tray motor terminal Reinstall the base plate in the oven Secure its 4 screws COUPLER 68 TRAY MOTOR FIG 9 17 10 REPLACING A COOKTOP LIGHT SOCKET 8 SA WARNING Personal Injurv Hazard Disconnect from the electrical supplv before servicing the unit Failure to do so could result in electrical shock or other personal injurv CAUTION Personal Injurv Hazard Because of the weight and size of the microwave oven two people are required to safelv move and install it Failure to do so could result in personal injurv L a aska je a TE trija ie l L 1 Pull the connectors off the cook top light socket terminals set the base plate aside 2 Remove the screw for the cook top light socket and remove it 3 Mount the new light socket into the holder 4 Reattatch the connectors with the orange and brown wires over the light socket terminals 5 Mount the base plate to the microwave oven FIG 10 18 11 REPLACING THE DOOR ASSEMBLV s I WARNING i Personal Injury Hazard Disconnect from the electrical supplv before servicing the unit Failure to do so could result
11. KOT 151S0A PKCPSWLDOO BLACK BISQUE WHITE KOT 152U0A PKCPSWLFOO BLACK BISQUE WHITE KOT 152C0A PKCPSWLF10 BLACK BISQUE WHITE KOT 155S0A PKCPSWLD10 BLACK BISQUE WHITE SCREW TAPPIMG TI TRS 4X10 7112401011 HARNESS LAMP KOT 150S0A 3512766700 SCREW TAPPING TI TRS 4X10 7112401011 FILTER AIR AL 3511900200 SCREW TAPPING TI TRS 4X10 MFZN BK 7112401012 BRACKET LAMP COVER SECC T0 5 M GY 3510605000 FOAM UR 5TX10X60 3517303300 COVER LAMP GLASS T3 0 3511405500 a PALTE B PAINTING AS KOT 150S0A 3514501500 BLACK BISQUE WHITE HOLDER LAMP PENOL 250V 75W 3513003000 SCREW TAPPING TI TRS 4X10 MFZN 7112401011 LAMP BL 125V 30W T25 C7A 187 68 3513602400 PART NAME DESCRIPTION PART CODE REMARK HARNESS MAIN KOT150S0A 3512717100 CORD POWER AS 3X14AWG 80X80 250 RTML 35113UDNY8 FUSE CERA UL CSA 65TS 125V 20A 5F1CD2031S THERMOSTAT OFF 40 ON 56 V 250 3518905500 SCREW TAPPING T2S PAN 4X6 MFZN 7121400611 THERMOSTAT OFF 90 ON 0 V 187 3518904800 SCREW TAPPING T2S PAN 4X6 MFZN 7121400611 BASE R SBHG T0 8 3510312900 TRANS HV DY N10A0 15T 3518116300 SCREW TAPPING TI TRS 4X10 7112401011 S
12. Vellow connector Blue controller CN2 Brown fan motor Orange controller CN5 Black controller CN5 Red fuse Blue controller CN2 Secondarv Interlock FIG 7 1 15 8 REPLACING THE THERMOSTAT BOTTOM VENT 9 8 q WARNING Personal Injury Hazard Disconnect from the electrical supplv before servicing the unit Failure to do so could result in electrical shock l other personal injury l L d 1 Disconnect the electric supply to the microwave oven 2 Remove the vent grille and the cabinet from the microwave oven See cabinet removal on FIG 1 3 Remove the wire protector see Fig 4 4 Remove the screw from the top center tab of the control panel See FIG 2 5 From the top and back of the control panel lift the top locking tab and pull the top of the panel out slightly then lift bot tom tabs of the panel out of the slots and pull it forward Set the panel inside the oven cavity while you work Refer to FIG 8 and the inset for the following steps 6 Remove the mounting screw from the bottom thermostat and lift the bottom flange out at slot in the chassis See FIG 8 7 Unplug the two wire connectors from the bottom thermostat 8 Connect the two wires to the new bottom thermostat 9 Insert the bottom tab of the bottom thermostat into the chassis slot and s
13. T2S PAN 3X6 MFZN 63 7121300611 4 KOT 155S0A PART NAME DESCRIPTION PART CODE REMARK FRAME DOOR 3512204430 BLACK BISQUE WHITE HANDLE DOOR 3512604400 BLACK BISQUE WHITE BARRIER SCREEN O TEMP GLASS T3 2 3517006280 BLACK BISQUE WHITE SUPPORTER HANDLE 3515307910 BLACK BISQUE WHITE DOOR PAINTING AS KOT 150S0A 3511712300 BLACK BISQUE WHITE HOOK POM 3513101200 SPRING HOOK PW1 3515101800 SCREW TAPPING T2S TRS 4X16 MFZN 7122401611 BARRIER SCREEN 7 PE TO 1 3517006300 GASKET DOOR PP 5113MF6 A353B BK 3512302100 DECORATOR DOOR U SUS 430 T0 5 H L 3511609100 DECORATOR DOOR L SUS 304 T0 5 H L 3511608800 DECORATOR DOOR T SUS 430 T0 5 H L 3511609000 DECORATOR DOOR R SUS 430 T0 5 H L 64 3511608900 vY 2 CONTROL PANEL ASSEMBLV 1 KOT 150S0A KOT 151SOA KOT 152U0A KOT 152C0A PART NAME DESCRIPTION PART CODE REMARK SWITCH MEMBRANE KOT 150S0A 3518522300 BLACK BISQUE WHITE KOT 151S0A 351822310 BLACK BISQUE WHITE KOT 152U0A 351822320 BLACK BISQUE WHITE KOT 152C0A 3518522330 BLACK BISQUE WHITE CONTROL PANEL 3516722700 KOT 150S0A BLACK BISQUE WHITE
14. 3516722710 KOT 151S0A BLACK BISQUE WHITE PC 3516722720 KOT 152U0A 152C0A BLACK BISQUE WHITE BACK PLATE SECC T0 6 3516802100 KOT 150S0A SECC T0 6 3516802110 KOT 1 51S0A 152U0A PCB AS KOT 150S0A KOT 151S0A 3514324410 KOT 152U0A 3514324400 SCREW TAPPING T2S TRS 4X12 MFZN 65 7122401211 2 KOT 155S0A PART NAME LI 601 602 03 DESCRIPTION B04 PART CODE B05 REMARK SWITCH MEMBRANE KOT 15580A 3518522340 BLACK BISQUE WHITE DECORATOR C PANEL STS430 T0 5 3511609200 CONTROL PANEL PC 3516722730 BLACK BISQUE WHITE BACK PLATE SECC T0 6 3516802110 KOT 155S0A PCB AS KOT 155S0A 3514324410 SCREW TAPPING 25 TRS 4X12 66 7122401211 3 TOTAL ASSEMBLV e ze RN lt ASY A a Mi A dy A w A PA x 9 KSA 67 PART NAME DESCRIPTION PART CODE REMARK DOOR AS KOT 150S0A 3511712200 BLACK BISQU WHITE KOT 151S0A 3511712210 BLACK BISQUE WHITE KOT 152U0A KOT 152C0A 3511712220 BLACK BISQUE WHITE KOT 155S0A 3511712250 BLACK BISQUE WHITE CONTROL PANEL AS KOT 150S0A PKCPSWLAOO BLACK BISQUE WHITE
15. 1042 i NU SECONDARY INTERLOCK Q SWITCH lt CHECK METHOD STAGE POINT A 1 DOOR OPEN OPEN 2 DOOR CLOSED CLOSED CHECK NO METHOD REMEDY Check the stage ON OFF of the secondary interlock switch by resistance measurement Replace secondary interlock switch 6 When the digital clock does not operate properly D22 D23 lt B IC1 Q6 65 C106M D21 D24 38 P10 1N4004Ax4 R30 R20 __ 10 ue MN C11 10K T 1042 1042 777 V1O CHECK METHOD WAVE FORM T 16 67 ms 60 Hz If clock does not keep exact time vou must check resistor R20 transistor 6 49 6 When Er01 8 Er03 come on display FB V2 V2Z 00 4 CN3 102 was gg A 35312 081R 200 and IC 1 104Z 1 2W 348 1 R12 3 32K 1 R14 1 82K 1 e e e 54 P60 R15 200 ZD2 L C4 R11 3 32K 1 2 l a 1047 C5 1042 D R16 200 C6 104z R6 Er 46 R17 357K 1 RZ SARE 47 P01 T R8 301K 1 45 PO2 102K RQ 150K 1 49 R10 75K 1 LAN 50 4 CHECK METHOD When AUTO REHEATING is just operating check the point A B amp D after 1 2 minutes CHECK POINT REMARK Tolerance A 0 5V lt VALUE lt 3 5V _ B 11 3Vdc C 4 4Vdc D 2 2Ndc
16. CAUTION Personal Injurv Hazard Because of the weight and size of the microwave oven two people are required to safelv move and install it Failure to do so could result in personal injurv L EE Tj SI DT Twil TIT A ET l L 1 Remove the vent grille from the microwave oven See Cabinet Removal for this procedure Refer to FIG 3 and the insets for the following steps Remove the screw from the lamp bracket stirrer motor cover 3 Pull the connectors off the stirrer motor terminals 4 Remove 2 mounting screws from the stirrer motor and remove the motor 5 Mount the new stirrer motor to the oven with its two mounting screws 6 7 8 N Connect the wires to the stirrer motor terminals Reinstall stirrer motor cover Refer to Cabinet Installations and reinstall the vent grille on the microwave oven 10 4 REPLACING AN OVEN LIGHT SOCKET 8 8 8 WARNING Personal Injurv Hazard Disconnect from the electrical supplv before servicing the unit Failure to do so could result in electrical shock or other personal injurv Remove the screws for the vent grille and remove the grille See FIG 1 on Remove the screw from cavity lamp bracket and pull out Remove the socket mounting screw fr
17. TURN Q crock Table 52 2 Tvpe of encoding and pad names 6 5 4 3 2 1 0 O ZO ZO O lt el 2 2 2 2 AUTO SENSOR COOK cook WARM TIMER 9 8 7 O A A 49 49 2 2 2 2 po BAKED DINNER FROZEN FROZEN ADD BEVERAGE POPCORN POTATO PLATE VEGETABLE PIZZA MINUTE O O 49 POWER MORE COOK AUTO CLOCK T TABLE FAVORITE LESS TIME DEFROST A START ON OFF CHOICE START O LO LO 17 e 2 ye CANCEL FAN FAN FAN RIGHT LIGHT LIGHT OFF HIGH LOW OFF ON NIGHT OFF 42 ZO ZO ZO ZO LO ZO ZO The membrane keyboard consists of 35 keys whose configurations are described above and provide 12 pad termintions to be connected to the touch control circuit 3 Key check procedure To determine if the membrane keyboard is defective or not check the continuity of each pad key contacts with a multimeter 10 pad Between A and H 2 1 pad Between B and H 3 2 pad Between C and H 4 3 pad Between D and H 5 4 pad Between E and H 6 5 pad Between F and H 7 6 pad Between G and H 8 7 pad Between A and 9 8 pad Between B and 10 9 pad Between C and I 11 TIMER pad Between D and I 12 WARM pad Between E and I 13 SENSO
18. 2 2 6 VAC FIX the PIN 1 2 amp 32 33 on the PCB Defective display Refer to the display trouble shooting data below Replace PCB assembly Loss of vacuum in the display White spot is White spot generated on SENSOR TIMER TTOFF MUTE ASTART MEMO the display 2 THE DISPLAY TROUBLE SHOOTING DATA TROUBLE Replace PCB assembly DISPLAY NAME amp PIN OUTPUT IN PIN NO MEMO doesn t come on GRID1 1G 7 A STSART doesn t come on GRID2 2G AM PM doesn t come on GRID3 3G MUTE don t come on TT OFF doesn t come on GRID5 5G e TIMER don t come on GRID6 6G 6 5 4 3 2 SENSOR don t come on 24 25 26 GRIDA 46 27 28 29 30 GRID7 7G 1 SEGMENT a doesn t come on from G1 to G7 SEGMENT a 11 17 SEGMENT b doesn t come on from G1 to G7 SEGMENT b 7 21 SEGMENT c doesn t come on from G1 to G7 SEGMENT c 16 12 SEGMENT d doesn t come on from G1 to G7 SEGMENT d 14 SEGMENT e doesn t come on from G1 to G7 SEGMENT e 17 SEGMENT f doesn t come on from G1 to G7 SEGMENT f 4 SEGMENT g doesn t come on from G1 to G7 SEGMENT g 5 SEGMENT h doesn t come on from G1 to G7 SEGMENT h 6 SEGMENT i doesn t come on from G1 to G7 SEGMENT i
19. 20 1 32 TROUBLE SHOOTING GUIDE Following the procedures below to check if the oven is defective or not 1 2 3 4 Check grounding before checking trouble Be careful of the high voltage circuit Discharge the high voltage capacitor When checking the continuitv of the switches fuse or high voltage transformer disconnect one lead wire from these parts and the check continuitv with the AC plug removed do otherwise result in a false reading or damage to vour meter 5 Do not touch anv part of the circuit on the touch control circuit since static electric discharge mav damage this control panel Alwavs touch vourself to ground while working on this panel to discharge anv static charge built up in vour bodv First of all operate the microwave oven following the correct operation described in users guide manual instruction manual bv time cooking in order to find the exact cause of anv trouble TROUBLE 1 Oven does not operate at all anv input can not be accepted CONDITION CHECK RESULT CAUSE REMEDV Fuse blows Check continuity of gt continuitv gt Malfunction of Replace NOTE1 interlock monitor interlock monitor switch w
20. R 6 10 8 connecting status of humidity sensor must be checked before checking point A B C amp D The Method of connecting humidity sensor IC2 LM358 Humidity Sensor Wire 5 8 a RED WHITE BLACK l 17 A Vss 1 A 5 AE 3 7 4 8 CN3 GND 50 TROUBLE SHOOTING Following the procedures below to check if the oven is defective or not Check grounding before checking trouble Be careful of the high voltage circuit Discharge the high voltage capacitor When checking the continuity of switches of of the high voltage transformer disconnect one lead wire from these parts and then check conitnuity with the AC plug removed To do otherwise may result in false reading of damage to your meter 5 Do not touch and part of the circuitry on the touch control circuit since static electric discharge may damage this control panel Always touch yourself to ground while working on this panel to discharge any static charge built up in your body First of all operate the microwave oven following the correct operation described on pages 6 19 by time cooking in order to find the exact cause of any trouble TROUBLE 1 The following visual conditions indicate a probable defective touch control circuit or membrane switch assembly Incomplete segments A Segments missing B Partial segments missing
21. 8 SEGMENT j doesn t come on from G1 to G7 SEGMENT j 18 SEGMENT doesn t come on from G1 to G7 SEGMENT k 9 SEGMENT T doesn t come on from G1 to G7 SEGMENT I 10 SEGMENT m doesn t come on from G1 to G7 SEGMENT m 13 SEGMENT n doesn t come on from G1 to G7 SEGMENT n 19 e AM don t come on UPPER BAR p15 15 SENSOR TIMER TTOFF MUTE PM A START MEMO don t come on 47 LOWER BAR p16 12 MEASURE POINT 4 When there is no microwave oscillation When touching START pad oven lamp does not turn on Fan motor does not rotate but cook indicator in displav comes on Gause RELAV 6 does not operate IC1 RELAY 6 25 E D15 45 P17 o 1N4148 V3 012 RYG OJ SS 124LM 24V A B A CHECK METHOD STAGE POINT B RELAY 6 ON GND RELAY 6 OFF 24VDC When touching START pad oven lamp turns on Fan motor and turntable rotate and cook indicator in display comes on Cause RELAY 1 does not operate CHECK METHOD IC1 RY 1 D10 sori 1N4148 24V 7 STAGE POINT B C RELAY 1 ON GND 24VDC RELAY 1 OFF 24VDC 24VDC 48 5 When the door is opened during operation the Count down timer does not stop B 5V CN2 IC1 R18 10K PO7 53 gt 6 Gi R1 08 1N4148
22. G Digit flickering other than normal fluorescent slight flickering D TOUCH CLOCK PAD TO ENTER TIME OF DAY does not disply when power is on A distinct change in the brightness of one or more numbers in the display One of more digits in the display are not on when they should be Display indicates a number different from one touched For example touch 5 and 3 appears in the display Specific numbers for example 5 and 3 will not display when the panel is touched Display does not count down or up with time cooking or clock operation Oven is programmable and cooks normally but no display shows 9 Display obviously jumps in time while counting down 10 Display counts down noticeably too fast while cooking 11 Display can not shift from the first stage cooking to the third stage cooking while 3 phase cooking including defrost 12 Display does not show the time of day when dear pad is touched in clock mode 13 Oven lamp and fan motor and tum table motor do not stop although cooking is finished Check if the RELAY 5 and 6 contacts close if they are close replace touch control circuit NA MON jm Xx QN AN NANNA SENSOR TIMER TT OFF MUTE AM PM A START MEMO 51 TROUBLE 2 Digital readout displav does not show programming even if the membrane kevboard is programmed bv touching proper pads NOTE Before following the particular steps listed above in the trou
23. Hazard Disconect from the electrical supplv before servicing the unit Failure to do so could result in electrical shock or other personal injurv ee _____________ __________________________________ CAUTION Personal Injury Hazard Because of the weight and and size of the microwave oven two people are required to safely move and install it Failure to do so could result in personal injury L RR ST Ta A IET L 1 Remove the vent grille the wire protector and the base plate from the microwave oven See FIG 1 2 2 Remove the control panel so that vou can access the high voltage section in the microwave oven See FIG 1 l I V NOTE Personal Injurv Hazard Disconnect from the power supply before servicing Discharge the capacitor using a 20 000 W discharge resis tor or an insulated plastic handle screwdriver to short across the capacitor terminals l ECT FIG 17 26 3 Discharge the high voltage capacitor A Remove 4 screws from the H V Transformer and save the screws Refer to FIG 17 1 for the following steps 5 Unplug the five high voltage transformer wire connectors and remove high voltage transformer 6 Mount the new high voltage transformer to the plate with 4 mounting screws vou removed earlier 7 Connect 5 wire connectors going to the high voltage capacitor the high voltag
24. Input and Output Microwave Connections Wave Guides Flanges and Gaskets Must be Secured Never Operate the Device Without a Microwave Energy Absorbing Load Attached Never Look Into an Open waveguide or Antenna While the Device is Energized L ee SPECIFICATIONS Model 1505 1515 KOT 152U KOT 152C KOT 155S Power Supplv 120V 60 Hz Rated Current 14 0 A microwave oven oniv Power Consumption 1600W Max Microwave Output Power IEC 705 1000W Frequency 2450 MHz 50 MHz Outside Dimensions WxHxD 760x427x375 mm Cavity Dimensions WxHxD 492x240x340 mm Net Weight 24 5Kg Timer Digital 99 min 995 Power Selections 10 Levels Cavitv Volume 1 5 ft Magnetron cooling Forced air Microwave Distribution Stirring fan disk and turntable Rectification voltage doubler half wave Door Sealing Choke System Safety Device Cavity Thermostat Bottom Thermostat Hood Thermostat Line Fuse Door Interlock Switches open 194 90 reset 32 0 open 194 90 reset 32 0 open 104 40 reset 132 8 56 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Magnetron type 2M218 High Voltage Capacitor 0 98 2 1KV AC High Voltage Diode 350 mA 9 0 KV Cook top Lamp 125V 30W Cavity Lamp 125V 30W Tray Glass SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTI
25. Normal High speed 25 to 45 ohms b Normal Low speed 45 to 65 ohms Set the ohmmeter to the R x 1000 scale and measure the resistance between the motor terminals a Normal 3k to 4k ohms b Abnormal infinite or zero ohms Set the ohmmeter to the R x 1000 Scale and measure the resistance between the motor terminals 39 a Normal 3k to 4k ohms b Abnormal infinite or zero ohms COMPONET TEST PROCEDURE RESULT High Voltage Capacitor Capacitor Terminal To Terminal Set the ohmmeter to the Rx10k scale and measure the resistance across the capacitor terminals a Normal The meter indicates several ohms then gradually returns to infinity b Abnormal The meter indicates infinity or Zero ohms a short immediately Terminal To Case Set the ohmmeter to the Rx1 scale and measure the resistance between each terminal and the case a Normal The meter indicates infinity b Abnormal The meter indicates zero ohms or a short Vent Motor Capacitor Terminal To Terminal Set the ohmmeter to the Rx10k scale and measure the resistance across the capacitor terminals a Normal The meter indicates several ohms then gradually returns to infinity b Abnormal The meter indicates infinity or Zero ohms a short immediately High Voltage Diode Rectifier Cathode Forward Continuity Set the ohmmeter to the Rx1 scale and
26. in electrical shock other personal injury l ee E CE CES nu ESO V DEO t l EE 1 I CAUTION l Personal Injurv Hazard Because of the weight and size of the microwave oven two people required to safelv and install it I Failure to do so could result in personal injury l Refer to FIG 11 for the following steps 1 Remove the Grille 2 Open the door and lift the door FIG 11 12 REPLACING THE GASKET WARNING Personal Injury Hazard I Disconnect from the electrical supplv before servicing the unit Failure to do so could result in electrical shock l other personal injury L al Refer to FIG 12 for the following steps NS PRY QUT GASKET FIG 12 1 Open the oven door 2 Pry out the gasket along the edges of the door with a putty knife 3 Install the new gasket so that it fits tightly into place inside the door 20 13 REPLACING CAVITV THERMOSTAT aS En a a a al WARNING Personal Injury Hazard Disc
27. m um m m m mm m m WARNING This Device is to be Serviced bv Qualified Service Personnel Consult the Service Manual for Proper Service Procedures to Assure Continued Safetv Operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energv 1 Remove the two screws from the top of the microwave oven for the vent grille and remove the grille See FIG 1 Refer to FIG 2 FIG 2 1 for the following steps FIG 2 2 Remove the screw from the front of the microwave oven for wire protector and remove the wire protector see FIG 1 3 Remove the screw from the top center tab of the control panel 4 From the top and back of the control panel lift the top locking tab and pull the top of the panel out slightiv then lift the bottom tabs of the panel out of the slots and pull it forward IMPORTANT Please mark or photograph the wires before disconnecting them to ensure proper reconnection If you are sending a control panel assembly for repair please skip the steps marked below CE 4 Unplug the following connectors from the control circuit board a 2 Pin connector at CN2 b 2 Pin connector on relay RY1 mark carefully c 3 Pin connector at CNS d 6 Pin connector at CN4 e 6 Pin connector at CN3 Only sensor type model f Lift the end of
28. measure forward resistance across the rectifier terminals with the lead touching the anode and the lead touching the cathode 40 a Normal The meter indicates several ohms b Abnormal The meter indicates continuity or zero ohms a short 4 SAFETY INTERLOCK CONTINUITY TEST You can test continuity of safety interlock and monitor switch by using ohmmeter The switch operation is checked by zero untimited The meter should indicate zero resistance The sequence of check is interlock monitor switch primary and secondary interlock switches check 1 In case of interlock monitor switch check PRIMARY INTERLOCK SWITCH INTERLOCK MONITOR SWITCH INTERLOCK MONITOR SWITCH OHHMETER 41 Condition 1 Door is opened 2 Common terminal of the monitor switch is connected Condition 1 Door is closed WIRING DIAGRAM 1 WIRING DIAGRAM
29. rectifier 6 Remove the capacitor mounting strap screw the remove the old capacitor 29 7 Position the new high voltage capacitor with the round blister between the leads Make sure that the flange on the strap is against the front end of the capacitor and tighten the screw just enough to hold the capacitor in place 8 Connect the end of the high voltage rectifier and red wire coming from the high voltage transformer to the indicated capacitor terminal 9 Connect the remaining red lead coming from the magnetron to the indicated capacitor terminal VOLTAGE C GH VOLTAGE SCREW FIG 19 30 20 REPLACING THE MAGNETRON a a a WARNING Personal Injury Hazard Disconnect from the electrical supply before servicing the unit Failure to do so could result in electrical shock or other personal injury Tt CAUTION l Personal Injurv Hazard Because of the weight and size of the microwave oven two people are required to safelv move and install it Failure to do so could result in personal injurv L i il L 1 Remove the microwave oven from its mounting location 2 Remove the vent grille the wire protector and the cabinet from the microwave oven See Cabinet Removal 3 Remove the control panel so that you can access the high voltage section in the microwave oven
30. the control panel It is a normally closed and will open at a set temperature to disable the oven The vent thermostat is located directly behind the control panel It is a normally open that when closed the Vent motor activates a low speed This thermostat is automatically resettable POSSIBLE CUSTOMER COMPLAINT The unit turns on by itself Open Reset Cavity Thermal Cut Out 194 90 32 0 Bottom Thermal Cut Out 194 90 32 0 Vent Thermostat 104 40 132 8 56 Magnetron Thermostat 302 150 140 60 CAVITY THERMAL CUT OUT BOTTOM THERMAL CUT OUT 37 VENT MOTOR CAPACITOR The Vent motor capacitor is located directly behind the control panel It is in use any time the Vent motor is on The capacitor helps to maintain a constant voltage to the Vent motor so that it runs more efficiently YELLOW CONNECTOR TEST CHARTS COMPONET TEST PROCEDURE RESULT High Voltage Transformer With wire leads unplugged Set the ohmmeter to the Rx1 scale and measure the a 0 4 to 0 6 ohms UN a Primary winding b 70 to 130 ohms b Secondary winding c 0 ohms c Filament winding a Normal infinity Set the ohmmeter to its Rx1000 b Normal infinity gt scale and measure the SSS a Primarv to ground b Filament to ground Magnetron with wire leads unplugged Set the ohmmeter to its Rx1000 scale and measure the a Normal readings NOTE a Filamen
31. 0 3511800100 CAPACITOR RUNNING 250VAC 6 0UF 3518301100 GUIDE AIR T PP 5101SW BK 3512519100 MOTOR SHADED POLE 120V 60HZ MW15XA P02 3963822400 SCREW TAPPING T2S PAN 4X30 MFZN 7121403011 HARNESS THERMOSTAT KOT 150S0A 3512766600 alm _ _ _ _ a CABINET PCM OR PAINTED STEEL 3510802900 BLACK BISQUE WHITE SCREW TAPPING TI TRS 4X10 MFZN BK 7112401012 COVER MOTOR CONDENSOR SBHG T0 6 3511405200 GUIDE DAMPER SECC T0 5 3512516500 VALVE DAMPER ET 10 21 3515400400 SCREW TAPPING TI TRS 4X10 70 7112401011 S M NO 15050 003 DAEWOO DAEWOO ELECTRONICS CO LTD 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA TELEX DWELEG K28177 8 CABLE DAEWOOELEC PRINTED DATE Feb 2002
32. 190 mm 3 The oven and the empty vessel are at ambient temperature prior to the start of the test The initial temperature of the water is 10 2 C 50 3 6 F It is measured immediately before the water is added to the vessel After addition of the water to the vessel the load is immediately placed on the center of the shelf which is in the lowest normal position Microwave power is switched on Heating time should be exactly 41 sec Heating time is measured while the microwave Generator is operating at full power The filament Heat up time for magnetron is not included 5 The initial and final water temperature are selected so that the maximum difference between the ambient and final water temperature is 5 C 6 The microwave power output P in watts is calculated from the following formula P 4187 X AT t AT is actual temperature rise tis the heating time The power measured should be 1000W 10 0 CAUTION 1 Wather load should be measured exactly to 1 liter 2 Input ower voltage should be exactly 120V as specified 3 Ambient temperature should be 20 2 C 68 3 6 F 34 2 MICROWAVE RADIATION TEST On ever service call checks for microwave energv emission must be made according to the following manner 1 Remove the cooking rack from the oven cavitv if the microwave oven is so equipped 2 Place 275mL 9 oz glass of water in the center of the oven bottom 3 Select HI
33. 1M Ohm 5 RD AZ105J KOT 150S 1515 1555 RESISTOR 1 6W 604K Ohm 1 59 RN AZ6043F KOT 150S 1515 1555 NAME SVMBOL SPECIFCATION PART CODE REMARK RESISTOR 1 6W 301K OHM 1 RN AZ3013F KOT 150S 1515 1555 RESISTOR 1 6W 150K Ohm 1 RN AZ1503F KOT 150S 1515 1555 RESISTOR 1 6W 75K Ohm 1 RN AZ7502F KOT 150S 1515 1555 RESISTOR R11 R12 1 6W 3 32K Ohm 1 RN AZ3321F KOT 150S 1515 1555 RESISTOR R13 1 2W 200 Ohm 5 RD 22201JS KOT 150S 1515 1555 RESISTOR 1 6W 1 82K Ohm 1 RN AZ1821F KOT 150S 1515 1555 RESISTOR R15 R16 1 6W 200 Ohm 5 RD AZ201J KOT 150S 1515 1555 RESISTOR R17 1 6W 357K OHM 1 RN AZ3573F KOT 150S 1515 1555 RESISTOR R19 1 6W 100K Ohm 5 RD AZ104J RESISTOR R22 1 6W 4 7K Ohm 5 RD AZ472J RESISTOR R23 1 2W 270 Ohm 5 RD 22271JS RESISTOR R25 1 4W 1K Ohm 5 RD 4Z102J RESISTOR R26 R27 1 2W 200 Ohm 5 20 22201 5 1 2W 150 Ohm 5 RD 22151JS KOT 150S 1515 1555 RESISTOR FUSIBLE R28 1 4W 1 Ohm 5 RF AZ109J RESISTOR R29 1 2W 27 Ohm 5 RD 22270JS RESISTOR R30 1 6W 47K Ohm 5 RD AZ473J RE
34. CE EXTERNAL VIEW REFER TO THE INSTALLATION GUIDE INSTALLATION REFER TO THE INSTALLATION GUIDE OPERATIONS AND FUNCTIONS REFER TO THE USE AND CARE MANUAL DISASSEMBLV AND ASSEMBLV Caution to be observed when trouble shooting Unlike manv ther applicances the microvave oven is high voltage high current equipment It is completely safe during normal operation However carelessness is servicing the oven can result in an electronic shock or possible danger from a short circuit You are asked to observe the following precautions carefully Alwavs remove the power plug from the outlet before servicing 2 Use an insulated screwdriver and wear rubber gloves when servicing the high voltage side Discharge the high voltage capacitor before touching anv oven components or wiring 4 1 Check the grounding Do not operate on a two wire extension cord It is imperative therefore make sure it is grounded properly before beginning repair work 2 Warning about the electric charge in the high voltage capacitor For about 30 seconds after the operation has stopped an electric charge remains in the high voltage capacitor When replacing or checking parts short between oven chassis and the negative high terminal of the high voltage capacitor by using a properly insulated screwdrive to discharge 4 When the 20A fuse is blown due to the operation for the mon
35. GH cook power turn the microwave oven on and test for R F leakage using the following pattern a Check around the cabinet at the front b Check around the door c Check around the console panel d Check horizontally across the door e Check vertically across the door f Check diagonally across the door g Check across the air vents h Check across the rear air vent WARNING The scan speed is 1 in sec Electromagnetic energy leakage monitor NARDA 8100B HOLADAYH1501 600 cc glass beaker with an inside diameter of approx 8 5cm 3 5in Glass thermometer 100 C or 212 F When checking for R F leakage use an approved R F measuring device to assure less than 4mW cm emission at 5cm distance with a maximum scan rate of 2 5cm second in compliance with U S Government Department of Health Education and Welfare 21 CFR1030 performance Standard for Microwave Ovens A proper operating door and seal assembly will normally register small emission but they must be no greater than 4mW cm to allow for measurement uncertainty All microwave ovens exceeding the emission level of 4mW cm must be reported to Department of Service for microwave ovens immediately and the owner should be told not to use the microwave oven until it has been repaired completely 35 If a microwave oven is found to operate with the door open report to Department of Service the manufacturer and CD
36. H101V CAPACITOR ELECTRO EC5 50V RSS 220uF CEXF1H221V CAPACITOR ELECTRO EC6 85V RSS 10004uF CEXF1V102V CONNECTOR FILM CN1 FCZ 254 12 441M367170 CONNECTOR WAFER CN2 35313 0210 30166M7020 CONNECTOR WAFER CN3 35312 031R 30166M503R KOT 150S 1515 1555 CONNECTOR WAFER CN4 35328 0610 4CW3061MXO CONNECTOR WAFER CN5 YM396 05VA 3519150510 DIODE SWITCHING D1 D15 017 D18 1N4148 AUTO 52mm DZN4148 DIODE RECTIFYING D16 D19 D24 1N4004A AUTO 52mm DZD4004A DIODE ZENER ZD1 UZ 3 3BSB DZUZ3R3BSB DIODE ZENER ZD2 UZ 4 7BSB DZUZ4R7BSB KOT 150S 1515 1555 DIODE ZENER ZD3 UZ 24BSB DZUZ24BSB DIODE ZENER ZD4 UZ 5 6BSB DZUZ5R6BSB DIODE ZENER ZD5 UZ 13BSA DZUZ13BSA DIODE ZENER ZD6 UZ 3 9BSB DZUZ3R9BSB DIGITRON DP1 HNM 07MS11 DHNMO07MS 1 1 HOLDER VFD DPH PP 3513001400 IC MICOM IC1 TMP87CH14N 1365150501 IC Ic2 LM358 OP AMP 1IM385 KOT 150S 1515 1555 M165 M165 3514321130 RESISTOR R1 R5 R21 R24 1 6W 1K Ohm 5 RD AZ102J RESISTOR R2 1 6W 1M Ohm 5 RD AZ105J RESISTOR R3 R18 R20 1 6W 10K Ol m 5 RD AZ103J RESISTOR R4 1 6W 200 Ohm 5 RD AZ201J RESISTOR R6 1 6
37. M 3513101200 SPRING HOOK PW1 3515101800 SCREW TAPPING 25 TRS 4X12 7122401211 BARRIER SCREEN l PE TO 1 3517006300 GASKET DOOR PP 5113MF6 A353B BK 3512302100 61 2 151504 DESCRIPTION PART CODE REMARK FRAME DOOR 3512204410 BLACK BISQUE WHITE HANDLE DOOR 7 3512602910 BLACK BISQUE WHITE BARRIER SCREEN O TEMP GLASS T3 2 3517006210 BLACK BISQUE WHITE FRAME DOOR HANDLE SILICON RUBBER 3517304100 DOOR PAINTING AS KOT 150S0A 3511712300 BLACK BISQUE WHITE HOOK POM 3513101200 SPRING HOOK PW1 3515101800 SCREW TAPPING 4TS8 7122400811 BARRIER SCREEN 7 PE TO 1 3517006300 GASKET DOOR PP 5113MF6 A353B BK 62 3512302100 3 KOT 152U0A KOT 152C0A PART NAME DESCRIPTION PART CODE REMARK FRAME DOOR 3512204420 BLACK BISQUE HANDLE DOOR 7 3512603000 BISQUE BARRIER SCREEN O TEMP GLASS T3 2 3517006220 BISQUE HANDLE DOOR 7 3512602920 BISQUE WHITE DOOR PAINTING AS KOT 150S0A 3511712300 BLACK BISQUE WHITE HOOK POM 3513101200 SPRING HOOK PW1 3515101800 SCREW TAPPING 25 TRS 4X12 7122401211 BARRIER SCREEN l PE TO 1 3517006300 GASKET DOOR PP 5113MF6 A353B BK 3512302100 SCREW TAPPING
38. MS 702 802 Seu MODE VM san po LOE ze 2 200 sg wm me w 0 80 T193 jet ee jest 0 GNO 99 9 lt lt ANN qT NNN O JAWTNVA 22 LA aereo GO Lion MS LG 5 LO ga 0 ans 4 MZ VWHO 002 Alddy vonzei io 104 38 mW S m GAY Nea Kemp 5 Zon Po Po Fm KM a mA MZ NHO 091 Addy VOSS L QG L 10 103 158 923 g 87 aen won nen a m e AES Ea lt Q ER LIL 0 0 g LE NS unio naw 5909 x003 Agno o M LA Fam K ra fina Whos rm ra mf T MS NOU 0 Atz ddA FA oe s Ls 8 as a B z MW ZPIAJSA amp 8 6 minm mE ix a Lp AgI PPA ZA 4 65 594 olzo fiese ZNO 22 WWZ SS M GAY AGH 99A IA IND e NN e Oo 80 0 T y G gr ami Er 0 ed gr LIQ 1 Gnavi 1 H 23 l td Lt A BYLINE artani GYLDNE 60 KRES qu oh x23718 e IQ 20 caf 02 cat gaf 0 Sid oy FT H010W AVA HON ole FO am 9891 62 59 2 tsd 904 25 OLD 4 55 FAY O aay 3 9 fe amt 1 WOJ 1SW NONAO5 a pm fa mox 1 BFLINL BLE w aw n ol cia 3 910 o UHM E EE I s T 12 L LY o ren MOT HOLO INJA Bea obaw s ux ge NUS 01 1
39. NG THE VENTILATION MOTOR VENT MOTOR COVER SCREW 2 FIG 14 gg i i s CAUTION Personal Injurv Hazard Because of the weight and size of the microwave oven two people are required to safelv move and install it Failure to do so could result in personal l Remove the microwave oven from the microwave oven location Remove 2 screws for the vent motor cover and remove it See cabinet removal Remove the screws for the vent motor and lift the vent motor See FIG 14 Unplug the wire connectors for vent motor Install the new vent motor and secure the vent motor Connect the wire connector and secure the vent motor Mount the control panel to the oven and secure it with its mounting screw Refer to Cabinet Installation and reinstall the base plate and the vent grille on the micrewave oven 23 15 REPLACING THE FAN MOTOR a a WARNING Personal Injury Hazard Disconnect from the electrical supply before servicing the unit Failure to do so could result in electrical shock or other personal injury CAUTION Personal Injurv Hazard Because of the weight and size of the microwave oven two people are required to safelv move and install it Failure to do so could result in personal injurv L FETE A i
40. PEGIAL SCREW TT2 HEX 4X8 FLG MFZN 3516003700 SCREW TAPTITE TT3 TRS 4X8 MFZN 7272400811 DIODE HV SANKEN HVR 1X 32B D5 3 4416V24000 HOLDER HV CAPACITOR SECC T0 8 3513001900 SCREW TAPPING TI TRS 4X10 7112401011 CAPACITOR HV 2100VAC 0 98UF 250 3 0 3518302800 SCREW TAPPING TI TRS 4X10 7112401011 GUIDE AIR OUTLET SECC T0 5 3512519000 SCREW TAPPING TI TRS 4X10 7112401011 PROTECTOR WIRE SECC T0 6 3515703700 LOCK POM 3513804700 LEVER LOCK POM 3513700800 SW MICRO VP531A OF SZM V16 FA 61 4415A66910 SECONDARY SW MICRO VP533A OF SPNO 187 200G 4415A17352 LAMP SW MICRO VP532A OF SPNC 187 200G 4415A66600 MONITOR SW MICRO VP533A OF SPNO 187 200G 4415A17352 PRIMARY LEVER SW MICRO POM 3513702100 SCREW TAPPING T2S TRS 4X12 7122401211 SCREW TAPPING T2S PAN 3X6 MFZN 7121300611 THERMOSTAT OFF 150 ON 60 V 187 3518903400 MAGNETRON 2M218H KP 3518003100 SCREW SPECIAL TI TRS 4X16 SE MFZN 78312X40D1 SUPPORTER RANGE MT SBHG T0 8 3515306900 SCREW SPECIAL T1 TRS 4X16 SE MFZN 75312X40D1 NUT HEX NUT FLANGE M5X0 8P MFZN 7S627W50X1 SCREW TAPPING TI TRS 4X10 7112401011 MOTOR CONDENSOR 120 127V 60HZ W1D46JA002 3964821200 CAVITY AS KOT 150
41. R COOK pad Between F and I 14 AUTO COOK pad Between G and I 15 ADD MINUTE pad Between A and J 16 FROZEN PIZZA pad Between B and J 17 FROZEN VEGETABLE pad Between C and J 18 DINNER PLATE pad Between D and J 19 BAKED POTATO pad Between E and J 53 20 POPCORN 21 BEVERAGE 22 START 23 FAVORITE CHOICE 24 TURNTABLE ON OFF 25 CLOCK AUTO START 26 AUTO DEFROST 27 COOK TIME 28 POWER LEVEL MORE LESS 29 LIGHT OFF 30 LIGHT NIGHT 31 LIGHT ON 32 FAN OFF 33 FAN LOW 34 FAN HIGH 35 CANCEL OFF pad pad pad Between C and L pad pad pad pad pad Between F and J Between G and J Between A and K Between B and K Between C and K Between D and K Between E and K Between F and K Between G and K Between A and L Between B and L Between D and L Between E and L Between F and L Between G and L 54 2 COMPONENT INFORMATION 1 TRANSISTOR KTA1270V KTC3198GR C C Emitter Base Emitter Base Collector Collector KTC1027Y KRC106M E C Emitter Base Emitter Base R2 R1 4 7 KOhm Collector Collector RO C KOM 2 DIODE AND ZENER DIODE DIODE ANODE A D1 24 ZENER DIODE CATHODE K ANODE A 201 6 55 3 PRINTED CIRCUIT BOARD FILM Ies a
42. RH immediately Also tell the owner not to use the oven The interlock monitor switch acts as the final safety switch protecting the customer from microwave radiation If the interlock monitor switch operates and opens the line fuse the interlock switches have failed and you must replace all of them primary and secondary interlock switches and the monitor switch because their contact may be melted and welded together All repairs must be performed so that microwave energy emissions are minimal CDRH Center for Device and Radiological Health Food and Drug Administration MAKING THE MEASUREMENTS MEASURING THE OVEN WITH THE CABINET INSTALLED MEASUREMENT NOTES When measuring for leakage use the 2 5cm spacer that is provided with the probe Leakage with the outer panels removed should be less than 5mW cm Leakage for a fully assembled oven before the lamp switch primary is interrupted with the door opened slightly should be less than 2mW cm Do not exceed the meter s full scale deflection Do not move the test probe along the measuring surfaces faster than 1 inch per second 2 5 cm sec otherwise a false reading will occur When testing near a corner of the door keep the probe perpendicular to the surface and move it horizontally with out touching the surfaces otherwise a false reading will occur Hold the test probe by its gripping surface only otherwise a false reading will occur To measure for o
43. S M T150S0A003 Service Manual Microwave Oven Model KOT 15080A KOT 151S0A KOT 152U0A KOT 152C0A KOT 155S0A DAEWOO ELECTRONICS CO LID http svc dwe co kr Feb 2002 PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGV a Do not operate or allow the oven to be operated with the door open b Make the following safetv checks on all ovens to be serviced before activating the magnetron or other micro source and make repairs if necessarv 1 Interlock operation 2 Proper door closing 3 Seal and sealing surfaces arcing wear and other damage 4 Damage to or loosening of hinges and latches 5 Evidence of dropping or abuse c Before turning on power to the microwave oven for anv service test or inspection within the microwave gen erating compartments check the magnetron wave guide or transmission line and cavitv for proper align ment integritv and connections d Anv defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner e A microwave leakage check to verify compliance with the Federal performance standard should be per formed on each oven prior to release to the owner TABLE OF CONTENTS PROPER USE AND SERVICE PRECAUTIONS
44. S0A 3516110600 GUIDE TRAY RACK POLYSULFONE 3512515900 BUTTON LOCKING PP HONAM A353B 4078502031 COVER STIRRER PP 5113MF6 A353B 69 3511406800 PART NAME DESCRIPTION PART CODE REMARK COUPLER STIRRER PPS 3517401800 STIRRER BLADE AL050 H18 TO 7 3517100900 MOTOR SYNCRO 120V 2 4W ST 16 KX63MRAA 3966820710 SCREW TAPPING T2S PAN 4X6 7121400611 SCREW TAPPING T2S PAN 4X6 7121400611 MOTOR SYNCRO 120V 2 4W ST 16 KX63XOAD 3966820810 COUPLER PPS 3517400600 ROLLER TELON D 14 5 3514701501 GUIDE ROLLER PP 3512519300 TRAV BORO S1 GLASS NEG 441X335A10 TRAY RACK MSWR 3 3517207100 _ lt GRILLE AIR 3512400300 BLACK BISQUE WHITE FILTER GHARCOAL AL 3511900300 SCREW TAPPING TI TRS 4X10 7112401011 LAMP BL 125V 30W T25 C7 187 3513602400 HOLDER LAMP PENOL 250V 75W 3513003000 COVER MOTOR SYNCRO SECC T0 5 3511406700 SCREW SPECIAL T1 TRS 4X16 SE MFZN 75312X40D1 SCREW SPECIAL T1 TRS 4X16 SE MFZN 78312X40D1 SENSOR HUMIDITY DH 1 D2 35148101200 SCREW TAPPING T2S PAN 3X6 MFZN 7121300611 THERMOSTAT OFF 90 ON 0 V 187 3518904800 SCREW SPECIAL T1 TRS 4X16 SE MFZN 78312X40D1 FAN PP GF2
45. SISTOR ARRAY RA1 6P 5 1 8 100K 5 RA 86X104J RESISTOR ARRAY RA2 5P 4 1 8 100K 5 RA 85X104J RESONATOR CERAMIC CRI KBR 4 0MKSTF 5PKBR40MKS SW RELAY RY1 G5G 1ADT 24V 5SC0101124 SW RELAV RY2 RY6 OJ SS 124LM 55C0101405 SW RELAY RY7 KM1 M24V 1C 2P 5SC0102115 TRANSISTOR Q1 Q3 Q6 Q8 Q12 KRC106M AUTO TZRC106M TRANSISTOR Q2 KTA1270T AUTO TZTA1270Y TRANSISTOR QA Q5 KTC3198GR AUTO TZTC3198GR TRANSISTOR Q7 KTC 1027Y AUTO TZTC1027Y TRANS POWER LVT DMR 210P 5EPU041351 VARISTOR VR1 TNR15G271K DTNR15G271 WIRE COPPER 7 5mm J1 J3 J6 J7 1 0 52 TIN COATING 85801052GY WIRE COPPER 15mm J2 J5 J15 1 0 52 TIN COATING 85801052GY WIRE COPPER 12 5mm J4 1 0 52 TIN COATING 85801052GY WIRE COPPER 10mm J8 J12 1 0 52 TIN COATING 85801052GY WIRE COPPER 7 5mm 51 1 0 52 TIN COATING 60 85801052GY KOT 150S 1515 1555 EXPLODED VIEW AND PARTS LIST 1 DOOR ASSEMBLV 1 KOT 150S0A PART NAME DESCRIPTION PART CODE REMARK BLACK FRAME DOOR 3512204400 BISQUE HANDLE DOOR 7 3512602900 BISQUE BARRIER SCREEN O TEMP GLASS T3 2 3517006200 BISQUE SUPPORTER BARR S 0 ABS XR 401 H 2938 3515307000 BISQUE WHITE BLACK DOOR PAINTING AS KOT 15080A 3511712300 BISQUE WHITE HOOK PO
46. TE ER TN A a A L 1 Remove the microwave oven from its mounting location 2 Remove the vent grille the wire protector and the cabinet from the microwave oven See Cabinet Removal 3 Remove the screw from the top center tab of the control panel Refer to the inset and perform the following steps 4 Unplug the fan motor wire connectors from the motor terminals and remove the fan motor assembly 5 Pull the fan blade and compression washer off the shaft of the defective fan motor 6 Remove the two motor mounting screws from the fan motor and remove it 7 Mount the new fan motor to the fan motor housing with the two mounting screws 8 Slide the fan blade 9 Connect the fan motor wires to the fan motor terminals Reassembly 1 Connect the wiring to the control panel circuit board and then mount the control panel to the oven with its mounting screw 2 Refer to Cabinet Installation and reinstall the cabinet and the vent grille on the microwave oven with its mounting screw 3 Reinstall the microwave oven in its mounting location FAN BLADE FIG 15 16 REPLACING THE POWER CORD a a a J WARNING Personal Injury Hazard Disconnect from the electrical supply before servicing the unit Failure to do so could result in electrical shock or other personal injury I
47. ble shooting guide for the membrane kevboard failure please check for the continuitv of each wire harness between the membrane kevboard and control box assembiv MEMBRANE KEVBOARD CHECK PROCEDURE 1 Check the pad termination order and nomenclature 12 11 10 gt J O OU m TI G T X amp OI O O Termination Connector 15050 KOT 151S0A KOT 152U0A KOT 152C0A KOT 155S0A POPCORN BEVERAGE FAVORITE CHOICE r KE BAKED DINNER FROZEN FROZEN m BAKED DINNER FROZEN FROZEN BRE BAKED DINNERJ FROZEN FROZEN re SE EE DoD GEE POTATO PLATE PIZZA VEGETABLE oj PLATE J przza VEGETAE AUTO COOK AUTO ADD AUTO AUTO ADD SENSOR COOK AUTO m c COOK TIME DEFROST MINUTE COOK TIME DEFROST MINUTE COOK TIME DEFROST MINUTE J 1 2 3 1 2 3 1 2 POWER sewa 3 LE PONER 4 5 6 456 WARM iz F Y J s 4 5 6 4 5 Warm IA b WARM want 8 9 7 9 J 7 8 9 Kitchen ECS 7 8 9 TIMER ep B SME hoo om 0 om Stop STER Skart CANCEL OFF START OFF kj CA Ski STOP CLEAR START dus Vent Fan m Vent Fan Light ka po Ze En mec ar ur to ose om FI Hg daw COD ED Ng COD tow On Z 7 B KITCHEN TURN TIMER
48. creen 3 A broken front panel oven cavity 4 A loosened door lock 5 A broken door lock The door gasket plate and oven cavity surface should be kept clean No grease soil or spatter should be allowed to build up on these surfaces or inside the oven DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN The microwave oven has concealed switches to make sure the power is turned off when the door is opened Do not attempt to defeat them DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL FOR SAFE SERVICE PROCEDURES 1 If the oven is operative prior to servicing a microwave emission check should be performed prior to servicing the oven 2 If any certified oven unit is found to have excessive emission level 5mW cm2 the service person should a inform the manufacturer importer or assembler b repair the unit at no cost to the owner c attempt to ascertain the cause of the excessive leakage d tell the owner of the unit not to use the unit until the oven has been brought into compliance 3 If the oven operates with the door open the service person should tell the user not to operate the oven and contact the manufacturer and CDRH immediately EST eg TFS cd RZA TE SEES ES LC CAUTION Microwave Radiation Personnel Should not Be Exposed to the Microwave Energy Which May Radiate from the Magnetron or Other Microwave Generating device if it is Improperly Used or Connected All
49. e transformer and the magentron as shown in FIG 17 1 BLACK RED RED RED WHITE FIG 17 1 27 18 REPLACING THE HIGH VOLTAGE RECTIFIER a a a a WARNING Personal Injury Hazard Disconnect from the electrical supply before servicing the unit Failure to do so could result in electrical shock or other personal injury CAUTION Personal Injurv Hazard Because of the weight and size of the microwave oven two people are required to safelv move and install it Failure to do so could result in personal injurv L II L 1 Remove the vent grille the wire protector and the control panel from the microwave oven See FIG 1 FIG 2 2 You can access the high voltage section in the microwave oven 4 WARNING Personal Injurv Hazard Disconnect from the power supply before servicing Discharge the capacitor using 20 000 W discharge resis 4 tor or an insulated plastic handle screwdriver to short across the capacitor terminals I zl TEENS 3 Discharge the high voltage capacitor 4 Unplug one end of the high voltage rectifier from the high voltage capacitor terminal 5 Remove a screw from the end of the high voltage rectifier and remove the high voltage rectifier 6 Mount the eyelet on the end of the high vol
50. ecure the thermostat with its mounting screw 10 Mount the Control panel to the oven and screw it with its mounting screw 11 Mount the vent grille to the microwave oven and check out the operation Vent thermostat is same as bottom thermostat method See FIG 8 2 SCREW BOTTOM THERMAL CUT OUT OPEN 212 F RESET 32 F 90 C 0 C VENT THERMOSTAT OPEN 104 F RESET 132 8 F 56 C FIG 8 16 9 REPLACING THE TRAV MOTOR WARNING Personal Injurv Hazard Disconnect from the electrical supplv before servicing the unit Failure to do so could result in electrical shock or other personal injurv _ __ _ ___ ________ _ _ ____________ ____________ CAUTION Personal Injurv Hazard Because of the weight and size of the microwave oven two people are required to safelv move and install it Failure to do so could result in personal injurv L l g A L 1 Remove 4 screws from the base plate and remove it Refer to the FIG 9 for the following steps Pull the connectors off the trav motor terminal Remove the screws from the trav motor and remove the motor Install the coupler onto the new tray motor shaft Mount the new motor to the oven with its the screws
51. for the following steps 1 Remove the microwave oven from its mounting location and set it on a protected padded work surface 2 Remove the two screws from the top of the microwave oven that secure the vent grille to the oven and pull the top of the vent grille out so the tabs are from their slots and remove it 3 Remove 2 screw from the vent motor cover 4 Remove the remaining 9screws from the top side and rear of the cabinet Slide the cabinet back and unhook it from the side tabs then slide the power cord into the cabinet and lift the cabinet off the oven Proceed to the section for the component you wish to service CABINET INSTALLATION Refer to FIG 1 for the following steps 1 Position the cabinet over the top of the microwave oven and slide the power cord all the way through the top opening 2 Slide the cabinet forward so that the tabs along the sides of the microwave fit into the corresponding slots in the cabi net 3 Loosely mount the screws to the top and sides of the cabinet When all of the screws are installed tighten them securely 4 Install the vent grille on the oven with the two long screws 5 Install the oven in its mounting location GRILLE amp CABINET SCREW BASE PLATE BASE PLATE SCREW FIG 1 2 OPERATING CONTROL SVSTEMS REPLACING THE CONTROL CIRCUIT BOARD
52. hem to the same terminals on the replacement switch See FIG 7 1 9 Sanp the new switch into place on the switch housing 10 Mount the interlock switch assembly to the chassis flange with two screws See FIG 7 N 14 MAKING ADJUSTMENTS Refer to FIG 7 1 for the following steps 1 If necessary adjust the interlock switch housing so that the switches operate properly The interlock Monitor Switch provides an added safetv check on the Primarv and Secondarv Interlock Switches If the Primarv and Secondarv Interlock Switches allow the oven to operate with the door open the Monitor Interlock Switch will blow the line fuse NOTE l Interlock switch replacement Whenever saftv interlock switches are replaced I Refer to the following diagram Check the connection of monitor switch after replacement Perform the electrical continuity check of interlock switches and microwave emission test mentioned in this manual SS 2 Mount the control panel to the oven with the screw you removed earlier 3 Mount the vent grille to the microwave oven and check out the operation of the switches HOUSING ASSEMBLY INTERLOCK SWITCH r Remove switch gt Primary Interlock Switch x Black fuse Red controller CN4 Black H V T Monitor Interlock Switch t Blue controller relay CH Red H V T Lamp Switch Switch
53. ing time is chosen the automatic cycle divides the defrosting time into 5 periods of alternating defrost and stand times by cycling on and off 4 When the door is opened during cooking 1 The primary interlock switch is opened to cut off primary voltage to the high voltage transformer to stop microwave oscillation 2 The secondary interlock switch is opened to give the door open information to touch control circuit The contacts of the RELAY 1 5 and 6 open the display stops counting down 44 3 Fan motor and turn table stop rotating A The oven lamp turns off 5 As soon as the door is opened the interlock monitor switch contacts close and creates the short circuit 6 If the contacts of primary interlock switch malfunction the 20A fuse blows open due to the large current surge caused by the short circuit activation and this in turn stops magnetron oscillation 5 When the CANCEL OFF pad is touched during cooking 1 The touch control circuit the voltage supplied to the RELAY 1 coil and causes the magnetron to stop oscillating 2 RELAY 5 and 6 turns off 3 The display will show the time of day If you don t set the clock the display will show a colon 4 The oven lamp turns off 5 Fan motor and turn table motor stop rotating OUTPUT POWER POWER LEVEL AGAINST FULL POWER RELAY 1 TURN ON OFF TIME ON 283 pum mI 0 29 0 3 29 10 5 29 17
54. ith door gt No Continuity _ switch closed COM NC gt Check continuity of gt continuity l 1 Shorted contacts gt Replace NOTE1 primary interlock of primary switch contact with interlock switch door partially open until interlock monitor switch contact close COM NC close Check continuity of Qorinfinte Shorted or open H gt Replace low primary winding of winding Voltge transformer low voltage b Approx 90 110 transformer L Normal Defective low gt Replace Disconnect S voltage capacitor side of the lead wire connected from high voltage to high voltage Capacitor and gt Fuse again blows Defective high 7 Replace operate the unit voltage capacitor NOTE 1 All these switches must be replaced at the same time plese refer to page 14 and 15 for adjustment instructions 33 MEASUREMENT AND TEST 1 MEASUREMENT OF THE MICROWAVE POWER OUTPUT Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below PROCEDURE Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load 1000 5cc of potable water 2 The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately
55. itor switch replace primary interlock switch secondary interlock switch and interlock monitor switch 5 After repair or replacement of parts make sure theat the screws are properly tightened and all electrical connections art tightened 6 Do not operate without cabinet I CAUTION l A Service personnel should remove their watches whenever working close to or replacing the magnetron mx CAUTION When servicing the appliance take a care when touching or replacing high potential parts because of electrical shock exposing microwave These parts are as follows HV Transformer Magnetron HV Capacitor HV l Diode L u a 1 GENERAL REMOVING REINSTALLING gt a m m m m m m a WARNING Personal Injury Hazard Disconnect from the electrical supply before servicing the unit Failure to do so could result in electrical shock or other personal injury I O CAUTION Personal Injurv Hazard Because of the weight and size of the microwave oven two people are required to safelv move and install it Failure to do so could result in personal injurv L MR EE EST EAN IE PCM pu cd xu DUCI IM EEUU MEUM l L CABINET CABINET REMOVAL Refer to FIG 1
56. om the cavity lamp bracket Remove the old light socket and mount the new socket in its place with its mounting screw Reattach the wire connectors over the light socket terminals Reinstall the cavity lamp bracket into its air guide top and secure the cavity lamp bracket with its mounting screw Mount the vent grille to the microwave oven and check out the operation CAVITY LAMP BRACKET SCREW CAVITY LAMP BRACKET FIG 4 11 5 REPLACING THE LINE FUSE l WARNING l Personal Injury Hazard Disconnect from the electrical supplv before srvicing the unit Failure to do so could result shock or other person l al injurv l L l 1 Remove 2 screws from the vent grille and remove the grille See FIG 1 2 Remove the screw from the front of the microwave oven for wire protector and remove the wire protector see Fig 1 3 Remove the screw from the top center tab of the control panel See FIG 2 4 From the top and back of the control panel pull out the Fuse Holder 5 Without touching the metal ends remove the defective line fuse from its holder and install a new one in its place 6 Mount the control panel to the oven and secure it with its mounting screw 7 Mount the vent grille to the microwave oven and check out the operation
57. onnect from the electrical supply before servicing the unit Failure to do so could result in electrical shock or other personal injury Discharge the high voltage capacitor before working inside the oven Failure to do so could result in electrical shock LU GG m w w w w sam a CAUTION l Personal Injury Hazard Because of the weight and size of the microwave oven two people required to safelv and install it Failure to do so could result personal injury L Se EA _ _ __ _ __ AM A A Remove the microwave oven from the microwave oven location Remove the vent grille and cabinet from the microwave oven See the cabinet removal Remove the 2 screws for supporter from the microwave oven Remove the power cord see the replacing the powercord Fig 16 Remove 4 screws for the vent motor and air guide top Remove the vent motor and lift the air guide top See FIG 13 1 Unplug and replace the two wire connectors from the cavitv thermostat See FIG 13 2 Install the new cavitv thermostat and reinstall the air guide top vent motor cabinet and vent grille on the microwave oven NOORO PO AR GUIDE TOP WIRE PROTECTOR FIG 13 21 FIG 13 1 FIG 13 2 22 14 REPLACI
58. s 6 A high voltage of 2000 Volts AC is generated in the secondary of high voltage transformer and this secondary voltage is increased by the action of the diode and the charging of the high voltage capacitor This resultant DC voltage is then applied to the anode of the magnetron As shown in Figure the first half cycle of the high voltage produced in the voltage transformer secondary charges the high voltage capacitor Current flow is in the direction of the dotted line during the second half cycle the voltage produced by the transformer secondary and the charge of the high voltage capacitor are combined and applied to the magnetron as shown by the solid line so that oscillations begin The disturbance wave generated by the magnetron is prevented by the choke coils of 3 2mH filter capacitors of 16pF and the magnetron s shielded case so that TV and radio programs are not impaired by noise 43 H V TRANSFORMER H V CAPACITOR OR 1 ORFA 5 MAGNETRON te Y The Touch control circuit controls the ON OFF time of RELAY 1 in order to vary the output power of the microwave oven from power level 1 to HI 10096 power One complete ON and OFF cycle of the RELAY 1 is 29 seconds The relation between indications on the control panel and the output of the microwave oven is as shown AUTO DEFROST CYCLE When auto defrost is selected and the desired defrost
59. s closed 1 The low voltage transformer supplies the necessarv voltage to the touch control circuit when the power cord is plugged in 2 The contacts of the interlock monitor switch open This switch creates short circuit to blow 20A fuse and stop magnetron oscillation when door is opened during oper ation under abnormal condition i e the contacts of primarv interlock switch do not open the circuit 3 The contacts of primarv interlock switch close the circuit m When cooking cycle power and time are set by touching the function pads and the desined mumerical pads 1 The function indicating bars are located on the digitron light to indicate that function have been set 2 The time you set appears in the display window 3 The touch control circuit memorizes the cooking program you set When the start pad is touched The RELAY 1 5 and 6 are controlled by the touch control circuit 1 120VAC is applied to the high voltage transformer through the contacts of RELAY 1 2 Fan motor starts rotating and cools the magnetron by blowing the air coming from the intake on the rear plate hole 3 The oven lamp lights the inside of the oven 4 Indicator light turns on to indicate function operation Cooking time starts count down 5 3 3 Volts AC is generated from filament winding of the voltage transformer This filament voltage is applied to the magnetron to heat the magnetron filament through two noise preventing choke coil
60. t terminal less than 1 A microwave energy leakage test must always be performed when the oven is serviced for Set the ohmmeter to its Rx1000 a Normal infinity any reason scale and measure the a Filament winding to chassis NOTE Replace the magnetron if the checks and all of the high voltage component tests are good but the unit still does not heat a load y Filament 38 COMPONET TEST PROCEDURE RESULT Switches with wire leads removed All of the switches are measured in the same manner N C Contacts p adi C Q N O Contacts N O and C Terminals Set the ohmmeter to the R X 1 scale and measure the resistance between the normally open N O and the common C terminals of the Switch a Normal The meter indicates infinity b Abnormal The meter indicates zero ohms a short N O and C Terminals Set the ohmmeter to the R X 1 Scale and measure the resistance between the normally close N C and the common C terminals of the Switch a Abnormal The meter indicates infinity b Normal The meter indicates zero ohms a short Fan Motor with leads disconnected Set the ohmmeter to the R x 1 scale and measure across the terminals a Fan Motor Normal 30 to 50 ohms Set the ohmmeter to the R x 1 scale and measure the a High speed windings blue and black wires b Low speed windings blue and white wires a
61. tage rectifier lead to the bracket with its mounting screw HIGH VOLTAGE CAPACITOR BRACKET HIGH VOLTAGE RECTIFIER FIG 18 28 19 REPLACING THE HIGH VOLTAGE CAPACITOR a a J WARNING Personal Injury Hazard Disconnect from the electrical supply before servicing the unit Failure to do so could result in electrical shock or other personal injury I ZAJ CAUTION Personal Injury Hazard Because of the weight and size of the microwave oven two people are required to safely move and install it Failure to do so could result in personal injury l l l l L RR taj ET SE ETG STE TETTERE PREGET l L 1 Remove the vent grille See FIG 1 FIG2 2 Remove the wire protector 3 Remove the control panel so that vou can access the high voltage section in the microwave oven See FIG 1 a a WARNING Personal Injurv Hazard Disconnect from the power supply before servicing Discharge the capacitor using a 20 000 W discharge resis tor or an insulated plastic handle screwdriver to short across the capacitor terminals d T ZEE 4 Discharge the high voltage capacitor 5 Unplug the wire connector going to high voltage transformer and one end of high voltage
62. the locking arm on the ribbon cable at CN1 then lift the ribbon cable out of the socket 5 Remove 4 screws from the control circuit board and lift the board off the mounting bracket 6 Clean the surface of the new display and the inside of the control panel window with a soft damp cloth to remove any dirt smudges or lint X 7 Mount the new control circuit board to the mounting bracket with 4 screws 8 Plug the following connectors over their control circuit board plugs so that they lock into place a 2 Pin connector at CN2 b 2 Pin connectors on relay RY1 c 3 Pin connector at CN5 d 6 Pin connector at CN4 e 6 Pin connector at CN3 Only sensor type model f Insert the end of the ribbon cable into the narrow slot of connector CN1 as far as it will go See FIG 2 2 Lower the locking arm so that the two small tabs fit into the cutouts of the ribbon cable then press down so that it locks into place 9 Mount the control panel to the oven and secure it with its mounting screw 10 Mount the vent grille to the microwave oven and check out the operation I PAL P FIG 2 1 FIG 2 2 3 REPLACING STIRRER MOTOR FIG 3 me me a a a WARNING Personal Injury Hazard Disconnect from the electrical supply before servicing the unit Failure to do so could result in electrical shock or other personal injury EEE EE
63. ven leakage 1 Pour 275cc 25cc of water into a 600 cc glass beaker 2 Place the beaker into the center of the microwave oven 3 Set the energy leakage monitor to 2 450 MHz and use it according to the manufacturer s recommended test procedure to obtain the correct results 4 Measure the microwave radiation with an electromagnetic radiation monitor the probe perpendicular to the surface being measured and measure around the door viewing window the exhaust opening and air inlet openings 5 Operate the oven at its maximum energy output and take the measurements MEASURING THE OVEN WITH THE CABINET REMOVED When the magnetron has been replaced use the previous procedure and measure for microwave energv leakage after all of the necessarv components are replaced or adjusted and before the cabinet is installed Take special care to measure around the magnetron and the waveguide WARNING Be careful not to contact anv of the high Voltage components when making measurements with the cabinet removed 36 3 COMPONENT TEST PROCEDURE THE THERMOSTAT AND THERMAL CUT OUT There are One thermostats and Two Thermal Cut Out in the OTR Microwave Oven Thev are the cavitv thermal cut out and the bottom thermal cut out The cavity thermal cut out is located air guide top This thermal cut out is normally closed and will open at a set temperature to disable the oven The bottom thermal cut out is located directly behind

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