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Service Manual

1. 15 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE E Qua aC Eque ES wae RTE es tne CT ES 16 TEST PROCEDURE awe Rak aapachtebzs mbetvs g 9vt ebasesesevabesetestenseveceensvusecolots tiucvatosstoneetvos URSUS ME MUR 19 MEASUHEMENTS AND ADJUSTMENTS A924 a ea a ee ee ee ee ee a ee ee Se 499 reece eremernnseuese 21 TROUBLESHOOTING GUIDE SATU EOC Ci ea ED EW SO ee beer WS Er 2 2 EXPLODED VIEW AND PARTS LIST E puti h a V ere AC en QVEM Dee V XA E Im ER OTT EN 2 7 DIGITAL PROGRAMM ER CIRCUIT PARTS LIST TORT CR LET Ce eT EEE TERETE RELL Ee ee OT TORRE re I 34 FEATURE NE C1453 MULTI STAGE COOKING Q CONVECTION COOKING Q GRILL COOKING COMBINATION COOKING Q mM NN A side 8 Memories MEMORY PROGRAM COOKING M B side gt Memories ir e NA ERT aa anna aaa a a a u r PREHEAT COOLING Q 1453 CONTROL PANEL Display Window Microwave Pad Co
2. 1 2 ELECTROLYTIC CAPACITOR AL HooMr so tx R77 ERDS2TJ472T CARBON FILM RESISTOR 47KO 5 3 C21 ECEA1HKA2R2B ELECTROLYTIC CAPACITOR AL 2 2MF S0V 20 RY5 6 7 ZN POWER RELAY 189 C22 23 24 1 1032 5 CERAMIC CAPACITOR 9 jO0IMF 25V 25 35 36 43 20 80 SPACER A amp 2845540GP SPACER CUSHION 1 IFOR DISP 49 50 21 AEXBM4X104JT COMPOUND RESISTOR 1 201 AEDZSR6ES3T1 ZENER DIODES 1 44 45 46 47 ECBT1H101KB5 CERAMIC 4 100001 50 2 10 202 5 51 53 AEDZ12ES2T1 ZENER DIODES 4 AEEMBO4BEHA CONNECTOR 1 HPN 204 AEDZ4R7ES3T1 ZENER DIODES 1 AEEMMDOFFO8W CONNECTOR 1 AEEM09FDZBTM CONNECTOR 1 AEEMMFOOFO4R CONNECTOR 1 4PIN RED AEEMMD01505W JPR1 ERDS2TJ183T CARBON FILM RESISTOR x 1 15 1 AEEMB11BEHA CONNECTOR 1 PIN CONNECTOR 1 SPIN EFOGC4194T4 RESONATOR 4 19MHZ D11 12 43 D13 33 41 42 45 46 51 52 53 54 55 61 62 63 64 65 66 67 044 DISP 18 014 196 5 5 DIODE SI A64563230BP AEIC50946238 0 03 FLUORESCENT TUBE LSJ IC3 AEIC102977AN iC ic AEICX24C04 wt AS BS 4 5 AEICUPA2004C ALAPO2TA101K INDUCTOR 100MH 2SD2006QRTA TR
3. 120 Q 1 Filament winding 2sec s eqsodqcsebt spanoeenapspnoseeocane Approx 0Q Primary winding 2809 Approx 00 30 2 High voltage capacitor A Check continuity of capacitor with ohmmeter on highest OHM scale B A normal capacitor will show continuity for a short time and then indi cate 9M once the capacitor is charged C A shorted capacitor will show continuous continuity D An open capacitor will show constant 9M Due to internal 9M Q resistor E Resistance between each terminal and chassis should be infinite 3 Diode A E the diode assembly from the circuit by disconnecting the eads B With the ohmmeter set on the highest resistance scale measure the resistance across the diode terminals Reverse the meter leads and again observe the resistance reading Meter with 6V 9V or higher voltage batteries should be used to check the front to back resist ance of the diode otherwise an infinite resistance may be read in both directions normal diode s resistance will be infinite one direction and sever al hundred in the other direction 4 Magnetron Continuity checks can only indicate an open filament or a shorted magnetron To diagnose for an open filament or shorted magnetron isolate magnetron from the circuit by disconnecting the leads B A continuity check across magnetron filament terminals shouid indi cate one ohm or less C A continuity check between each fil
4. 3 da 442 cta ISNA o 2 39005 2 Od Coz mice J8 831 13 3SIQN jou 51 pun p9so o 51 1000 910N 1453 WIRING DIAGRAM NOTE When replacing check the lead wire color as shown Colors shown by indicate colors of lead wire connector housing SECONDARY LATCH SWITCH SW5 Vf ea TO EXTENSION CONNECTOR PRIMARY LATCH SWITCH MAGNETRON FRONT MAGNETRON BACK SYMBOL 0 0 BL qi w 4 w d X 2 E g 6 E me d E FRONT H V TRANSFORMER H V TRANSFORMER FRONT BACK 84 010 1453 DESCRIPTION OF OPERATING SEQUENCE 1 Variable power cooking control The coil of power relays are energized intermittently by the digital programmer circuit when the oven is set at any power selection ex cept for High power position The digital programmer circuit controls the ON OFF time of power relays contacts in order to vary the output power the microwave oven The relation petween indications on the control panel and the output of the microwave oven is as shown in table NOTE 1 The ON OFF time ratio does not correspond with the per centage of microwave power since approximately 2 seconds are required for heating of magnetron filament NOTE 2 ON OFF timo of power relays are changed by digital prog rammer circuit when remaining cooking
5. D Remove the door C by carefully pulling outward starting from the up per right hand corner E Remove 2 screws holding door E F Separate the door from door E by carefully freeing catch hooks on door A while pulling outward DOOR KEY G Remove the door key spring and the door key SPRING H Remove 2 screws holding door handle I When mounting the door to the oven be sure to adjust the door para liel to the bottom line of the oven face plate by moving the upper hinge and lower hinge in the direction necessary for proper align ment Also adjust so that the door has no play between the inner door sur face and oven frame If the door is not mounted properly microwave may leak from the clearance between the door and the oven 5 Antenna motor A To remove the antenna motor carefully place the unit on its left side B Remove 2 screws holding motor cover C Remove 2 screws holding antenna motor D Disconnect motor lead wire ANTENNA MOTOR 6 Floor shelf and or moving antenna A Insert a philips type screwdriver or equivalent approx 2 in shaft length the hole of left side oven wall as shown in Figure B Carefully up the floor shelf by using the screwdriver until the floor shelf is lifted up over the level of oven opening front C Remove the floor shelf by lifting it up from oven front To replace moving antenna D Remove the moving antenna by simply lifting it up off
6. ORDER NO CAD9310672C2 Service Manual Microwave Oven 1453 Specifications Power Source Power Requirement Microwave Frequency Outside Dimensions Oven Cavity Dimensions Weight Specifications subject to 230 V AC Single Phase 50 Hz 3 300 W 2 570 Microwave 1 950 1 950 W Convection 1 350 W Full Microwave Power IEC 705 1 840 1 800 W Convection Heater 2 450 MHz 600 mm W X 484 mm D X 374 mm H as 406 mm W X 336 mm D X 217 mm H 38 0 kg change without notice 1453 WARNING This product should be serviced only by trained qualified personnel This service manual covers products for following markets When troubleshooting or replacing parts please refer to the country identifications shown below for your applic able product specification EPG For Continental Europe Page CONTROL PANEL a EORUM E EUH ERR PUERO NE SORS 3 OPERATION PROCEDURE AND DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE wvvvvesevsesadsecso VU usodtussetc oteasev veves EOE SE DE OO EOS 4 SCHEMATIC DIAGRAM we VERRE TOC TE ree 9 DESCRIPTION OF OPERATING SEQUENCE X Pp oteseestoseabbesouesesctosecesesottaptuuvn 11 CAUTIONS TO BE OBSERVED WH EN TROUBLESHOOTING ee eee eee ee eee ee ee eee ee VW FT WVEBBAD2V amp E44A42 ee eee ee eee
7. open waveguide or antenna while the device is energized CAUTION High voltage paris may become uncovered when outer cabinet is removed 1453 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 1 Magnetron Front and Back A Discharge High voltage capacitors B Remove 5 screws holding air guides C Disconnect magnetron triac and thermal cutout lead wire connectors D Loose wire harness lift up air guide E Remove 4 screws holding each magnetron F Remove 2 screws holding thermal cutout NOTE To prevent microwave leakage tighten mounting screws properly making sure there is no gap between the waveguide and the magnetron CAUTION When replacing the magnetron be sure the antenna gasket is in place 2 Digital programmer circuit DPC A Remove 1 screw holding tub of membrane switch B Remove 2 screws holding escutcheon base and slide the escutcheon base upward slightly C Disconnect all connector from DPC D Remove 3 screws holding DPC To replace membrane key board A Bent escutcheon A catch hooks strightly and separate escutcheon A and base B Remove smoke panel C Push the upper part of key board display window from back of escutcheon base peel off membrane key board NOTE 1 The membrane key board is attached to the escutcheon base with double faced adhesive tape Therefore applying hot air such as using of hair dryer is recom
8. operated with incorrect in stalled door hinge or magnetron it can cause mic rowave leakage of over 5mW chi Hence it is absolutely necessary to check if mag netron and door hinge are correctly and safely in stalled after repairs or replacement WARNING Never touch any circuit wiring with your hand nor with an insulated tool during operation 4 When parts must be replaced always remove the power plug from the outlet and discharge the high voltage capacitor 5 Confirm after repair A After repair or replacement of parts make sure that the screws of the oven etc are neither loose nor missing Microwave might leak if screws are not properly tightened B Make sure that all electrical connections are tight before inserting the plug into the wall outlet 6 Avoid inserting nails wire etc through holes in unit during operation Never insert wire other metal object through the lamp holes on the cavity or any other holes or gaps because such objects may work as an antenna and cause microwave leakage 7 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 input and output microwave connections waveguides flanges and gasket must be secure Never operate the device without a mic rowave energy absorbing load attached Never look into an
9. the stirrer motor shaft NOTE When replacing the moving antenna make sure the plastic stirrer spacers are correctly in place HOLE FOR FLOOR SHELF REMOVAL SCREWDRIVER 1453 7 Upper Heater A Disconnect upper heater lead wire connector B Remove 1 screw holding heater support C Remove the heater by pulling it out 8 Convection Heater A Remove 11 screws holding back panel BEATER B Disconnect heater and circulation fan motor lead wire connector C Remove 2 screws holding exhaust guide D Remove 4 screws holding air guide and H V Capacitor bracket E Remove 11 screws holding heater panel F Remove 6 screws holding heater support and heater HEATER PANEL EXHAUST GUIDE HEATER SUPPORT 1453 COMPONENT TEST PROCEDURE CAUTION 1 High voltage is present at the high voltage terminal of the high voltage transformer during any cook cy cle FILAMENT WINDING 2 W 1s neither necessary nor advisable io attempt measurement of the high voltage 3 Before touching any oven components or wiring always unplug the oven from its power source and discharge the high voltage capacitor 1 High voltage transformer A Remove connections from the transformer terminals and check con PRIMARY tinuity WINDING B Normal cold resistance readings should be as follows TERMINALS Secondary winding Peer e rrr Approx 800
10. 0 mins Press START When the time is up you hear 3 beeps sound Open the door and take the water load out The display goes back to previously setting time Close the door 1 minute later display will return blank N Press START The display goes back to previousiy When the time is up you hear 3 beeps sound n Open the door take food out setting time M s Close the door 1 minute later display will return blank NOTE For 2nd and 3rd stage cooking enter heating program between steps 3 and 4 above NOTE 1 When using HIGH MEDIUM LOW and SIMMER powers the of grill elements and convection fan operate to reduce the build up of condensation 2 For 2nd and 3rd stage cooking enter heating program be tween steps 4 and 5 above 1453 3 Grill Cooking 7 OPERATION DISPLAY 1 Open the door and place a food in the 4 Combination Cooking OPERATION DISPLAY 1 Open the door and place food in the oven and close the door Press GRILL twice to set Grill 2 Set the desired time by turning the timer dial t Press START pad When the time is up you hear 3 beeps sound Open the door and take food out The display goes back to previously setting time 7 Close the door 1 minute later display will return blank NOTE For 2nd and 3rd s
11. 4 pin PUT Cable 1453
12. ANSISTORSI 1 2W 120 2 2SA720PRTA TRANSISTOR SI 400MW 1 000 2 UN4124 TA TRANSISTOR SI3 0MW 4 2SC1318QSTA TRANSISTORSI 400MW 2 200 2 0 4111 TRANSISTOR SI 300MW E ERDS2FJ201T CARBON FILM RESISTOR 2 2000 1 4W 55 ERDS2TJ103T CARBON FILM RESISTOR 10 10KQ 1 4W 5 R13 21 23 24 31 32 57 58 80 81 R15 H16 17 18 60 61 62 63 72 73 74 75 76 R20 R22 26 78 70 1 390 1 4W 32 12 L0KQ 1 4W 5 ERD2FCGS390P CARBON FILM RESISTOR 502 DIODES ERDS2TJ182T CARBON FILM RESISTOR ERDS2TJ823T CARBON FILM RESISTOR 1 82K2 1 4W 25 ERDS2TJ471T CARBON FILM RESISTOR 47001 4W 5 ERDS2TJ153T CARBON FILM RESISTOR 15K Q 1 4W 55 ERDS2TJ332T CARBON FILM RESISTOR 3 3KQ 1 4W t5 R25 1 1 ERDS2TJ202T CARBON FILM RESISTOR 1 2K0 1 4W 5 1 1 R30 R34 R35 R36 ERDS2TJ272T CARBON FILM RESISTOR 27KQ 1 4W t5 ERDS2TJ751T CARBON FILM RESISTOR 7500 1 4W 596 SERVICE FIXTURES AND TOOLS EXTENSION CABLES DPC COMMON CHECKER AND ITS CABLE NOTE To be used when repairing the DPC board assembly directly NOTE To be used only when DPC checker is available on the oven for easy access of the board 40 004 4 pin Extention Cable ANE600ZK70GP DPC Common Checker 1 AT40P005 5 pin Extension Cable ble No AT30A32308P DPC Checker Cable t JNOTE 40 008 8 pin Extension Cahle abla Na
13. AQ A024392308P5 ANE0911000DF 92 ANE000Z000AA ANE000Z000AD ANE0922000EF ANE0922000EH ANEO0922000FJ ANE0922000JQ 002000 ANE0924000AJ ANE0926000CE ANE0927000BK A100A3230BP A100L3230BP A100Q3230BP A10083130AP At10D3230BP A10263030GP ANE10288U0AP A10473230BP At 1836000BP A18073230BP A18083230BP A18593230BP A200A3230BP A20194210AQ A202K3230BP A202L3230BP A203M3230BP A202J3230BP A20853230BP 22363230 22373230 A22392020AP A22413230BP A22423230BP A22433230BP A22583230BP A22593230BP A22603230BP A22613230BP A22773230BP A22783230BP A23793230BP AS301L3230BP A30203230BP ANES31368UOAP ANES31378U OAP ANE31388UOAP ANES2398U0AP ANE32628UDAP A400A3230BP AA400E3230BP A400K3230BP A400T3230BP LV TRANSFORMER CAUTION LABEL CAUTION LABEL SHELF TERMINAL LABEL CUSHION RUBBER CUSHION RUBBER B CUSHION RUBBER G CUSHION RUBBER CUSHION RUBBER CUSHION RUBBER CUSHION RUBBER CUSHION RUBBER C OUSHION RUBBER C CUSHION RUBBER CUSHION RUBBER CUSHION RUBBER BASE BACK PANEL COVER BACK PANEL RUBBER FOOT CABINET BODY U OVEN LAMP COVER U ANTENNA MOTOR COVER LOWER SASH BACK PANEL B RIGHT RAIL LEFT RAIL SHELF SUPPORT OVEN ANTENNA STOPPER MOVING ANTENNA REFLECTION PLATE CIRCULATION FAN CASE ANTENNA SHAFT DOOR HOOK MOUNTING RIGHT HEATER PANEL LEFT HEATER PANEL CIRCULATION FAN BACK ADIABATIC PANEL ADIABATIC
14. C Board F assy cw 8 _ 605032306 S 323EP D A B D E F tpud JPR3 194 K30 777 020 3 3K 2917 2501 318 ONSSI ECN11 3R Q551 250639 SC TT eom Ae dme me me INS a P 11 100 u 1 s 8 CONTROL 5V ee a CIRCUIT Ov R OV 4702 910K 103 e C50 OVEN 103 TEMP SENSOR 4 FCN11 4R Id c44 cSicae C p 10111011101 101 34 4 F10 P11 212 P13 14 16 P17 POS PO7 2 NN Ci453G6PG CN500 ECNC 3 20ms 145 18KQ c RESGO P C Board assy se EY 25V S 323EP 2 G H J NE C1453 1453 DIGITAL PROGRAMMER CIRCUIT PARTS LIST Description Description Pcs 1 Set 11 14 15 AECF50F104z CERAMIC CAPACITOR 9 0 41 42 48 55 20 80 R37 ERDS2TJO14T CARBON FILM RESISTOR 1 59 56 57 R67 ERDS2TJ105T CARBON FILM RESISTOR 1 HMO AW 5 12 ECEA1CKA100B ELECTROLYTIC CAPACITOR AL i HOMF 1V 20x R71 ERDS2FJ200T CARBON FILM RESISTOR C13
15. ERSE RESULT CAUSE CORRECTIONS Abnormal Replace and adjust latch switch and door Normal STEP 2 Shorted Defective L V T or DPC Normal Check lead wire harness Check Back side mag netron circuit STEP 2 Oscillates and 16A fuse is not blow No Oscillation and 16 fuse is blown again Check Front side mag netron circuit Component check procedure PRIMARY WINDING TERMINALS HIGHEST OHM SCALE 04 032 FILAMENT TERMINALS SCALE CASE k EN HIGHEST 87 B OHM _ i n 04 031 NOTE Be sure to replace protector diode together with those 5 In this case only D2 of protector diode may be shorted due to faulty H V Component Therefore if protector diode is not replaced together high voltage transformer will be damaged over heated SYMPTOM Shorted heater circuit Oven is dead Fuse are OK SYMPTOM Low microwave output power Defective Front or Back magnet ron circuit 1 1453 RESULT CAUSE CORRECTIONS Unplug triac lead wire connector and check continuity between heater terminal and chassis Thermal cutout Oven SW3 Low voltage transformer Heat 1 litter of water for exactly one minute at HIGH power and check temperature rise Thermal cutout SW1 Front and 5 Back Magnetron Power relay operation and RY3 Check operation by following pro cedu
16. ES3T1 FUSE RESISTOR RESISTOR CARBON FILM RESISTOR ZENER DIODE ECQU2A105MXA ECQU2A472MXA ECQU2A684MXA AEEMMDOO703W A62316010BP POLYESTER CAPACITOR POLYESTER CAPACITOR POLYESTER CAPACITOR CONNECTOR FUSE HOLDER 0 0047 250V 0688 F 250V 3PIN A62316000GP A621A 1810 ERF15Z7XJ240 2 100 621 ERZC10DK112A FUSE HOLDER FILTER COIL RESISTOR VARISTOR VARISTOR 24Q SW TS EFBRL37C20 007038 MA196 TAS 2SD639 PQRS ERDS2TJ681T BUZZER CONNECTOR DIODESI TRANSISTORS CARBON FILM RESISTOR 180 1 4 5 ERDS2TJ103T CARBON FiLM RESISTOR 10K Q 1 4W 5 5 423 EPG 1453 POWER RELAY POWER RELAY NOTE 1 Please order name plate together 5 323 EPG NE C1453 MEMO 1453 DIGITAL PROGRAMMER CIRCUIT SCHEMATIC DIAGRAM VOLTAGE TRANSFORMER a 4 1 8 25 R13 10K e Qv e ag 820 82K 5 a oe R21 Em i 204 4 7ES3 1 8 10K BY R15 91 1 2 2502006 1 AVCC T 100 3 5 22 VSS XCIN NORD PES OV C56 104 CX14 19MHZ CLOCK PLUSE GENERA i 2 EP 28 XIN ale Geis wards fore es C
17. HOLIMS HOLY TAS N3AQ I OInO WWH3HL CMS 49v8 NOSL3NOVW INOLND WWM3HL ZMS 1NOH3 N03813NSVA 100102 WWYSHL IMS HOISINVA er 3513 e sissvHo 42 SNIJONDOND gt lt 9408 1451 380 88 quvog 900 T x x 22 5 S Xm 3 z von o 00 2 HW61 P TVLIOIG gt o M3002N3 1955505 NU ull ANV OM Ovi 59555 LC d 69429 HOOD OOOO AD ce JOLSIWH3HL 7 1NOH3 39V110A J sk ua mm 7 INOX NOMNOVN ___ __ __ __ __ _ 35V11OA H9IH NOILOVO ee u Sad E ad OOFND 3 3 m m QU OB avt l BEAM OLAN GAY N3VWHOASNVML 39VI10 MCI x LOPNO n 680959500 lt jae zxidooc 92151700 im amp 0 0 0 el s sn i QMS T nom ql 9 A 5 NEN n HaVANOISNVYL p ji 5 agate 39v110A I c NOSL3NOVM R 9 x EE 2 i j OI 5 k gt mg M S LE E 2406 4 4 i AOPZOV 5 15 EMS
18. ITCH TIMER KNOB ESCUTCHEON A NOTE 1 ESCUTCHEON BASE SMOKE PANEL A80343230BP A81263230BP P1 A00033230EP INSTRUCTION BOOK 1 P2 AQ1023230EP PACKING 1 A01043230BP UPPER FILLER 1 NE C1453 Remarks LOWER FILLER VINIL COVER AQ1053230BP A01065130AP DOOR SHEET TRAY PACKING TRAY PACKING B PACKING MENU LABEL 107580 01083230 01173230 A02193230BP A03343230BP A04203230EP A06023230BP A06033230GP 01453230 OPERATING GUIDE WIRE RACK SHELF CERAMIC INSULLATING TRAY DOOR SHEET B LEAD WIRE HARNESS LEAD WIRE LFAD WIRE FERRITE CORE NOISE KILLER A030A3230GP 03603230 03813230 A50966520UP W NOISE KILLER A604Q6000BP 613932308 INSULATION TUBE 1 Vi W3 W4 W5 REF NO 76 BOARD U ECA1HM102E ELECTROLYTIC CAPACITOR 1000 F 50V AL POLYESTER CAPACITOR CONNECTOR CONNECTOR LSI ECQU2A104MNA 1 AEEMMDO04907W AEICTLP665JF 0 1 H F 250V TPIN A6244UE1625 2501266 0 5 2SD1991AQSTA ERDS2TJ302T ERDS2TJ511T HEAT SINK TRANSISTOR SI TRANSISTORS CARBON FILM RESISTOR CARBON FILM RESISTOR 3KQ 1 4W 59 5100 1 4W 3 596 ERQ12AJ201P 200 VON ES FUSE RESISTOR 390 0 1 4W 5 1000 1W 25 10K 0 25 ERQ14AJ331P ERG1SJ101P ERDS2TJ103T AEDZ20
19. MATERIAL A ADIABATIC MATERIAL B ADIABATIC MATERIAL C ADIABATIC MATERIAL D ADIABATIC MATERIAL E ADIABATIC MATERIAL F LOWER HEATER PANEL UPPER HATER PANEL ADIABATIC MATERIAL G HINGE DOOR HOOK HOOK HOOK LEVER SPRING LEVER SPRING B FAN MOTOR AIR GUIDE A EXHAUST GUIDE AIR GUIDE D A40213230BP A40313230BP A41573230BP A41592020AP Part No Part Name amp Description Pu Remarks PUE Part No 62 A41613230BP 41622020 41632020 A41636000BP A41793230BP A41806000BP A42123230BP A42563230BP A441Y3230BP A600B3230GP A603M3230BP ANE6030Q50GN A60373230BP A605Y3230BP 606 3230 A606W3230BP A610A3230BP A23853230BP A61413230DP ANE61448V0AP A61455850GP A61523230BP A61983230BP A620X3230BP ANE6202 3X0 A62193230BP ANE6230P10GN ANE6238X20AP A62443230BP A631E3230GP A699D3230GP A630232308P A631D3230GP A6408 2050 A64173230BP 437 1600 A64643230B8P A65533230BP A65643230BP A65953170GP A68823170GP A692Y3230GP A901A3230GP ANE9107A20GN A97213230BP A97223230BP A97233230BP A98243230BP _ AESMBCR30GM MS212105KW91 XNG4EVSL XNWSEFN XST4 6VS XTT4 12BVK XTC4 10BC FANCASE COVER AIR GUIDE C FAN BRACKET FAN FAN SPACER A FAN SPACER B FAN SPACER C FAN SPACER C HEATER FAN MOTOR HEATER FANMOTOR AIR GUIDE AIR GUIDE J EXHAUST COVER H V TRANSFORMER PC BOARD B U INCANDESCE
20. NT LAMP CAPACITOR BRACKET OVEN TEMP SENSOR PROTECTOR DIODE PROTECTOR DIODE SAFETY SWITCH ADIABATIC MATERIAL H LATGH SWITCH A ANTENNA MOTOR THERMAL CUTOUT MOTOR BRACKET CHANGE OVER SWITCH DIODE SI INSULATION COVER FUSE SPACER HEAT SINK HEATER A U HEATER B U INSULATION COVER B HEATER C WASHER HEATER SUPPORT A GLASS PLATE HEATER SUPPORT B HEATER BRACKET TRANSFORMER BRACKET FUSE B SPACER NOISE FILTER U AC CORD W PLUG U CORD HOLDER BRACKET A BRACKET B BRACKET BRACKET TRIAC H V CAPACITOR NUT NUT SCREW SCREW BLACK SCREW ln N gt N lt lt s C sh om wt b N s mh OOo a 1 2KVA 240V 29W V 16G 3E6 156 9026 Bw 156 1 5 220 230 0 85 F AC2100V FOR HEATER FAN MOTOR FOR SHELF SUPPORT 4X6 FOR GLASS PLATE 4X12 FOR BASE 4X10 FOR CABINET BODY XTC4 10FC SCREW 5 SCREW 4X10 FOR OVEN LAMP COVER SX10 FOR H V TRANSFORMER A402A3230BP AIR GUIDE E 5 323 EPG 5X10 FOR HINGE 4X10 FOR MAGNETRON FOR HEATER FAN MOTOR XSWANE5 10U SCREW XTWANE4 10RU SCREW XUEANES2KP RING FOR HEATER FAN MOTOR FOR OVEN LAMP COVER FOR HEATER FAN MOTOR FOR SHELF SUPPORT FOR BACK PANEL COVER WASHER WASHER WA
21. ON 1 Open the door DISPLAY NOTE When program iock is activated in ONE TOUCH mode i e Press required memory program number and oven immediately starts 2 Press LOCK pad and hold until PL appears in the display a 3 After 3 seconds display returns to 0 8 To release the Program Lock OPERATION DISPLAY 1 Open the door 2 Press LOCK pad and hold until appears in the display n gt 3 After seconds display returns to 0 i 1453 9 11 To Select Tone Level OPERATION DISPLAY OPERATION DISPLAY 1 Press REHEAT pad R 1 Open the door 1 2 Press for 2 seconds 2 Press START pad Preheat temperature wil be maintained at 170 C 3 oven has reached preheat 3 Press BUZZ pad to choose sound level e g twice for Middle temperature P flashes If not used oven will automatically switch off after 1 hour 4 Press PROG pad 10 Cooling 1 Press COOLING pad 5 After 3 seconds display returns to O 2 Press START pad 3 When finish cooling the display goes to blank The oven will cool in 3 30 minutes depending on temperature 70 C 1453 12 To Read the Cycle Count OPERATION 1 Open the door DISPLAY 2 1 While START pad pr
22. SHER WASHER WASHER XWAABV XWOABPN XWG4BV XWGSBY XWNANE65GV FOR EARTH DIODE FAN MOTOR CAPACITOR BRACKET WASHER 4X16 FOR HEATER SUPPORT 8X12 FOR EARTH 4X10 FOR XYCANE4 EE8 SCREW SCREW SCREW SCREW MAGNETRON XY C4 F16XN XY E6 F20F XYN4 J10FN 135 2M167B M14E SCREW 4X10 FOR CIRCULATION FAN CASE 136 XTTANE4 B10S A605S3030GP 0911000 137 138 P C BOARD U CUSHION RUBBER B DOOR ASSEMBLY 2 DOORB A300B3230BP UPPER HINGE A30013230BP DOORA U DOOR KEY LEVER B A302K3230BP DOORE U A30183230BP DOORKEY A30193230BP DOOR KEY B 021800 DOOR KEY SPRING ANE30562QO0AP HANDLE PIN 7 HANDLE PEICE A A30853230BP DOORC HANDLE PEICEB A31463230BP DOOR SCREEN B Ui A31473230BP HANDLE PEICE C A3 863230GP DOOR PANEL A32133230BP DOOR HANDLE SPACER A A32163230BP HANDLE SPACER XYNA F25FN SCREW 4X25 3 SCREW 4X30 XTBANE4 12FK j SCREW BLACK 4X12 FOR BASE A01573230EP 0962000 60313230 A605Q3230GP A605S3230BP NAME PLATE CUSHION RUBBER D D P CIRCUIT U PC BOARD U TIMER RTL W COMPONENT A61563230BP A63433230BP A64793230BP AS8UUD3Z3UBF A800N3230BP INSULATION PANEL TIMER BRACKET MEMBRANE SW
23. ament terminal and magnetron case should read open 5 Membrane key board Membrane switch assembly Check continuity between switch terminals by pressing an appropri NOTE OHMMETER SHOULD HAVE A MINIMUM ate pad on the key board 6 VOLT BATTERY The contacts assignment of the respective pads on the key board is as shown in the schematic diagram of DPC FORWARD REVERSE HANDRED KQ ANTENNA COOLING FIN MAGNETRON CASE Ji FILAMENT HIGHEST TERMINALS OHM SCALE 04 031 bun NE C1453 6 Protector diode A Isotate the protector diode assembly from the circuit by disconnecting its leads B With the ohmmeter set on the highest resistance scale measure the resistance across the protector diode terminals Reverse the meter leads and again observe the resistance reading A normal protector diode s resistance will be Infinite in both directions It is faulty if it shows continuity in one or both directions 7 To test the oven temp sensor thermistor This sensor monitors the heat produced by the heater circuit and maintains the oven temperature the user had selected Normal room temperature especially in a kitchen can vary anywhere from 10 C to 32 C The reading across the oven sensor thermistor should be within 360K ohm to 1500K ohm when reading an area within the 10 to 32 C room temperature range If the resistance reading is out of the range stated here the sensor is defective and m
24. e will continue to increase a while then decrease as shown in figure C When the oven temperature drops below selected temperature the digital programmer circuit senses the oven temperature and starts supplying 18V DC to the coils of power relays alternately again NOTE 1 When convection is selected with temperature setting of 100 250 C off period of both heaters is also programmed while oven temperature is lower than selected temperature as shown figure NOTE 2 After convection process if oven temperatune is higher than predetermind temperature fan motor rotates for 5 minutes at maximum time to cool the electric components and oven Selected oven UPPER HEATER UPPER HEATER CONVECTION Temperature IN SIDE OUT SIDE HEATER Convection Cooking START STOP OVEN TEMPERATURE CONVECTION HEATER ds xd RY 5 UPPER HEATER iN SIDE PIN RY 6 OFF UPPER HEATER OUT SIDE ON RY 7 OFF FAN MOTOR ON ON ec RY 9 100 6 CIRCULATION MOTOR RY 10 83007 NE C1453 3 Grill cooking control The digital programmer circuit generates the power relays control signals at a specific timing as shown in figure B When the oven temperature reaches the predetermined temperature ihe digital programmer circuit stops supplying power relays control signals resulting in both upper to turn off C When the o
25. entire cooking programme is completed C When the oven temperature drops below the selected temperature the digital programmer circuit generates power relays control signais again at the timing predetermined NOTE 1 After combination process if oven temperature is higher than predetermind temperature fan motor rotates for 5 minutes at maximum time to cool the electric components and oven Combination Convection Microwave START STOP SELECTED OVEN wv LM OE URN as 4 OVEN gt x CONVECTION HEATER au d RY 5 B UPPER HEATER 2 IN OUT SIDE RYG RY7 MOTOR ON PIT qe RY 9 MAX SMINS CIRCULATION MOTOR RY 10 MICROWAVE RY 1 MEDIUM FRONT arr x 84012 1453 CAUTIONS OBSERVED WHEN TROUBLESHOOTING Unlike many other appliances the microwave oven is high voltage high current equipment Though it is free from danger in ordinary use extreme care should be taken during repair CAUTION Servicemen should remove their watches whenever working close to or replacing the magnetron 1 Check the earthing Do not operate on a 2 wire extension cord The microwave oven is de signed to be used in a completely earthed condition It is imperative therefore to make sure it is pr
26. ess MICROWAVE pad f The display shows the total number of heating cycles at 1 100 times 2 2 While pressing START pad press 5 pad m The display shows the total hour of 2 heating time at 1 100 hour 2 3 While pressing START pad press 8 4 uc The display shows the total number of l 21 microwave cycles at 1 100 times 3 4500 Times 2 4 While pressing START pad press pad The display shows the tota hour of microwave time at 1 100 hour 1 5 OQ H ours After seconds display returns to NOTE When total number of heating cycle hour exceed 9999 the count will return to 0 Program List It is possible to check the program that have been entered into the 16 memory pads When the door is open press START pad and Memory pad No 1 simultaneously After 2 seconds the display window will show each individual stage of each Memory Program in the order B1 A2 etc Finally it will display the beep tone setting and the program Lock symbol PL before clearing to 0 NE C1453 SCHEMATIC DIAGRAM 600 78 5 tarze 30010 01031094 M3 3SION NY 3500 A dNvI N3AO 7 YOLIOVdVS BZOVLIOA HOIH MOLOW VNNJINV SN YOLOW NOILYINOYIO JW MOLOW NYd Li LAd 5 LHOHS 9 5 HOLIMS HOLY ANVONOO3S SMS
27. hes or the high voltage transformer disconnect one lead wire from these parts and then check continuity with the AC plug removed To do otherwise may result in a false reading or dam 5 Do not touch any parts of the circuitry on the digital programmer circuit since static electric discharge may Always touch yourself to ground while working on this panel to discharge any static charge in your body 6 A 230V AC is present at the shaded area 24 of the digital programmer circuit Terminals of power relays and primary circuit of low voltage transformer When troubleshooting be cautious of possible electrical shock hazard First of all operate the microwave oven following the correct operating procedures described order to find the exact cause of any trouble TROUBLE 1 Oven is dead 1 25A fuse is blown 16A fuse is blown Defective front or back side magnetron circuit STEP 1 Protector diode CHECK Primary latch switch and short switch Low voltage transformer a Check which magnetron circuit is defectives following procedure 1 Disconnect back side magnetron thermal cutout lead connector 2 Replace 16A fuse 3 Operate oven at high power for front side magnetron circuit only Check high voltage components assumed defective side circuit H V Transformer H V Capacitor H V Diode Magnetron NOTE OHMMETER SHOULD HAVE MINIMUM 6 VOLT BATTERY FORWARD HEV
28. isalignrnent or loose wiring of secondary latch switch mr aum ten arua 2 Oven lamp tum on when oven is plugged in with door closed Oven can program but not start ao 2 Defective secondary latch switch 3 Timer starts count down but no microwave oscillation 1 Off alignment of latch switches 2 Defective Primary latch switch 3 Defective short switch 4 Defective DPC TROUBLE 4 Other trouble SYMPTOM CAUSE 1 F 01 appears in the display with con 1 tinuous beep sounds over cook 2 F appears in the display Open or shorted oven temp sensor Defective F 35 appears the display Defective oven temp sensor Open triac Open heeter element Defective heater relays Defective DPC O Shorted membrane switch Defective 4 F 44 appears in the display Check beep sound level Defective buzzer Open or loose connection Defective 5 sound RON Burning food in the oven cavity due to Open or loose oven temp sensor connector _GORRECTIO NS Refer to operation procedure Refer to DPC troubleshooting GM Adjust door and latch switches ORRECTIONS It is s appeared when exhaust temperature is _ too high It is appeared 1 minute after start pad is pressed It is appeared 10 minutes after start pad is p
29. mended for smoother re moval 2 When installing new membrane key board make sure that the surface of escutcheon base is cleaned sufficiently so that any problems shorted contacts or uneven surface can be avoided 3 Alignment position of membrane key board is as follows see figure Membrane key board Right and lower edges 3 Low voltage transformer and or power relays NOTE Be sure to ground any static electric charge built up on your body before handling the DPC A Using solder wick or a desoldering tool and 30W soldering iron care fully remove all solder from the terminal pins of the low voltage trans former and or power relays NOTE Do use soldering iron desoldering tool than 30 watts on DPC contacts B With all the terminal pins cleaned and separated from DPC contacts remove the defective transformer power relays and install new transformer power relays making sure all terminal pins are inserted completely Resolder all terminal contacts carefully 4 4 ME HOW TO DISCONNECT pu SPECIAL LOCK CONNECTOR f PRESS THIS LEVER LOCKING LEVER MEMBRANE KEY BOARD RY8 I ms 05 048 453 4 Door assembly A Remove 2 screws holding the upper hinge to the oven B Open the door and while pulling the door toward you work the upper hinge out through the hole in the oven C Remove 4 screws holding the door C
30. nvection Pad Grill Pad Preheat Pad Cooling Pad Program Pads Oven Lamp Pad Timer Dial Shift Pad Stop Pad Start Pad Program Key Buzz Buzzer Key Program Lock Key 1453 OPERATION PROCEDURE 1 Multi stage Sequential Heating The oven can be Programmed with up to 3 different functions to operate in sequence These can be MICROWAVE GRILL CONVECTION or COM BINATION programs 2 Changing Heating Time The time can be increased or decreased during heating by turning the timer dial 3 Oven Lamp The oven lamp switches off when the door is closed If you want to check the food press the LAMP pad it will then illuminate for 10 seconds The oven lamp turns on whenever the door is opened 1 Microwave cooking for single stage 2 Convection cooking OPERATION DISPLAY OPERATION DISPLAY a tm i a Plug the power supply cord into 1 Open the door and place a food in the outlet oven and the door ES Open the door and place a water ioad in the oven and close the door Press CONVECTION pad 6 tin pad 6 times 9 Set the desired time aired mam daria he turning the 5 to set 200 C Press MICROWAVE pad once to 3 t High i ti dial set High power imer dia c mn E 1 Set the desired time by turning the timer dial Max time you can set High Medium 15 mins Low Simmer Detrost Stand 6
31. operly earthed before beginning repair work 2 if the door lock the door switch the door seal or the door develops a malfunction be sure not to operate the oven until complete repairs are made If the oven is operated with any of these parts in imperfect condition hazardous microwave leakage might occur WARNING Never operate the oven until the following are con firmed A The door is tightly closed B There is no broken hinge or door arm C The door seal is not damaged D The door is not bent or warped E There is no other visible damage 3 Warning about the electric charge in the high voltage capacitor For about 30 seconds after the oven is turned off an electric charge remains in the high voltage capacitor When replacing or checking parts remove the power plug from the outlet wait 30 seconds and short the terminal of the high voltage capacitor terminal of lead wire from diode to chassis ground with an insulated jumper lead wire or an insulated handle screwdriver to discharge HIGH VOLTAGE CAPACITORS 05 033 Touch chassis side first then short to the high voltage capacitor ter minal Important Note 1 High voltage above 250 volts are existing on following parts during operation High Voltage Transformer High Voltage Diode High Voltage Capacitor Unusual attention should be paid during repair or troubleshooting of product 2 If the microwave oven is
32. possible to test the magnetron by following procedure outlined below Necessary equipment 1 litre beaker Glass thermometer Wrist watch or stopwatch NOTE Check the line voltage under load to ensure it meets specifications Low voltage condition will cause a reduction in magnetron output Temperature readings and heating time should be as accurate as possible Output power performance test procedure A Fill the beaker with exactly one litre of tap water Stir the water using the thermometer and note the Record 1 Place the beaker the center of plate Set the oven for High power and heat for exactly one minute C After completion of the heating stir the water again with the thermometer and note the temperature Record as 12 The normal temperature rise T2 T1 for these models should be more than 11 5 C using the High power selection with the oven operating at the specified line voltage 21 SWITCH SECONDARY LATCH SWITCH PRIMARY LATCH SWITCH 05 027 Please confirm that the gap between the switch housing and switch actuator levers is no more than 1 when the door is closed 1453 age to your meter damage this control panel TROUBLESHOOTING GUIDE CAUTION 1 Check grounding before checking for trouble 2 Be careful of the high voltage circuit 3 Discharge high voltage capacitor 4 When checking the continuity of the switc
33. re 1 Disconnect Back side of mag netron thermal cutout 2 Operate oven at High power tor Front magnetron circuit only Open or loose connection of high voltage circuit especially magnetron filament circuit NOTE Large contact resistance will bring lower magnetron filament voltage and causing magnetron to lower output and or intermittent oscilla tion Check high voltage component for assumed defective front or back side circuit H V Transformer H V Capacitor H V Diode Magnetron Leaked to chassis Replace defective heater Check DPC Open or loose lead wire harness CAUSE CORRECTIONS Greater than 11 5 C Customer education Less than 11 5 C Front or Back side mag netron circuit ts faulty STEP2 motor operation Defective Back side magnetron circuit STEP 5 Abnormal Heated water Defective Front side magnetron circuit STEP 5 Repair loose connection STEP 6 No heat Abnormal Normal Check high voltage component according to component test proce dure and replace if it is defective 1453 TROUBLE 3 Oven does not start cooking SYMPTOM 1 Oven does not accept key input Program 1 Key input is not in sequence 2 Open or loose connection of membrane key pad to DPC Flat cable 3 Open membrane key board M M lt lt 4 Defective DPC 1 M
34. ressed at heater cooking mode Oven temperature is not reached 80 C within 10 minutes It is appeared when membrane switch is shorted for more than 2 minutes If beep sound level is set at 0 change it level 1453 TROUBLE 5 Trouble related to Digital programmer circuit SYMPTOM CHECK No display when oven is first plug Low voltage transformer L V T RESULT CAUSE CORRECTIONS Normal ged in and door is open secondary voltage CN2 pin 3 voltage IC1 pin 64 voltage Emitter of Q1 STEP 4 pin 27 voltage 14 pin of IC2 Abnormal Normal Approx 5V IC1 CX1 DISPLAY x Oven lamp No key input Membrane switch continuity Oven lamp does not turn on Replace oven lamp Fuse pattern of relay board Normal Membrane switch LAMP pad Open Membrane switch continuity IC1 pin 22 voltage Abnormal Normal 102 RY8 Procedure of fuse pattern repairing is as follows 1 Remove jumper wire 3400 f 2 Insert removed jumper wire J400 to A position and solder it If both A and B fuse pattern are open please replace PCB IC1 pin 54 and 11 volt ge Microwave power relay RY 1 at High power operation does not turn on Front side magnetron circuit Normal STEP 2 54 5V 11 5 Q5 tran
35. sistor Abnormal Q5 Normal 2 RY1 IC1 pin 54 and 13 voltage Abnormal Microwave power relay RY3 does at High power operation not turn on Back side magnetron circuit Normal STEP 2 54 5V 13 5 Q6 transistor Abnormal Normal 2 RY3 IC1 pin 10 voltage Triac does not turn on Abnormal Normal 5 Turn on 4 Not turn IC251 Shorted 2 pin 5 and 2 and start heater mode operation 25 1453 26 8c 943 6265 LLLI 2 IS 151 SLHVd MAIA SFLO 3N NE C1453 9443 6069 943 EZE S iysva HZNHOJSNYHIWH HOV NOHLSNOVN H3WHHOJSNYWL 1 18083 7 YAWHOISNYHLA H gt iNOS A 1SW3SSV 3579 NOSHOLNDSS ZE S lt 55 1453 PARTS LIST NOTE Part numbers are indicated on most mechanical parts Please use these part numbers for parts orders important safety notice Components identified mark have special characteristics important for safety When replacing any of these components use only manufacturer s specified parts Part Name amp Description Remarks a ETPA8SJY919N ANE00068U0EP ANE0072Z70GP A010T5020
36. tage cooking enter heating program between steps 3 and 4 above oven and close the door Press pad 6 times to set 200 C Press MICROWAVE pad once to set Low power Set the desired time by turning the timer dial Press START pad When the time is up you hear 3 beeps sound Open the door and take food out The display goes back to previously setting time Close the door 1 minute later display will return blank NOTE For 2nd and 3rd stage cooking enter heating program between steps 4 and 5 above 1453 5 Setting the Memory Program OPERATION 1 Open the door Press pad for more than 2 seconds P flashers in the display Press 2 pad to set program number A2 Press MICROWAVE pad once to High power Set the desired time by turning the timer dial Press PROG pad After 3 seconds display returns to 9 NOTE To program B side memories Press pad between steps 2 and 3 above Once the Memory area B has been selected it cannot be changed back to Memory area A If you do not require Memory area B cancel it by touching the cancel pad and begin again 6 Memory Program Cooking OPERATION RON NA ALA s uu 1 Open the door and place food in the DISPLAY oven and close door 2 Press 2 pad 3 Press START pad 7 Setting the Program Lock OPERATI
37. time or selected cooking time are within 1 minutes 30 seconds at MED LOW SIMMER and Defrost cooking mode NOTE 3 When using HIGH MEDIUM LOW and SIMMER powers the inside of upper heaters and circulation fan motor oper ate to reduce the build up of condensation NOTE 4 After microwave cooking if oven temperature is over than 100 C fan motor rotates for 1 to 5 minutes to cool the oven POWER RELAY ON OFF TIMING OF POWER RELAY MEDIUM 650W SIMMER 240W RY 3 70 TOTAL DEFROSTING TIME 2d ON DEFROST ES MEE E 180W P1 RY 3 oN RY 1 ON RY 3 84011 1453 2 Convection cooking control Heater ON OFF Time for Convection Cooking The digital programmer circuit controis the ON OFF time of upper and convection heater in order to control the oven cavity temperature see table and figure A The digital programmer circuit generates the power relays control signals at specific as shown table ON OFF ON B When the oven reaches the selected temperature ine digital prog rammer circuit senses the temperature through oven temp sensor 100 250 6 d 5 stops supplying 18 DC to the power relays resulting turn off of up per and convection heaters After the heaters have been turned off the oven temperatur
38. urs pane Lsi 3 P C Board ET CUSTOM lt lt xour 2 CN255 10250 2 1 2 IC2 102 977 Seo 25012665 EcN20 8 NC 3 cout 33 B 17 911 2 C25010004F 50V E 108 Xe P33 251 20653 S 15 6021 5V 2 2 NS 17251 i 10 14 Sov R77 47K 27 ECN20 6 TLPESSUF gem 3 EA INITIALIZE ain C22 105 RESET f ov p m F IDOOR CHECK ro 122 549 Poo 5 CIRCUIT 1 arc CIRCUIT 103 103 Power Retay mi CIRCUIT bp s 5 CN401 Ics P32 ME C i ECND 91t u PA2004 6 c L saa T TER n 1 P30 P46 G58 I 2 045 5 D 1 fel ELL eoue mW uae LAMP M 3 aoa CET d d 0t x 08 sa l E 12 pas pPA2004C 12 s 18 9 2 6 TI 15 06 5 16 Pa2 4 UN4124 Oo P lo 7 _ ANTENNA MOTOR 18V 10K 34 1 i 10K Ww INS RY2 G5J M 18V RY3 UPPER HEATER 5594 OUT SIDE 18 RY4 G5J 18V INRUSH BACK P
39. ust be replaced with sensor unit NOTE 1 When measuring resistance disconnect the 4 pin connector 4 from the DPC otherwise a false reading may be indi cated NOTE 2 If checking an oven sensor thermistor just after the microwave oven has been operating the sensor of course won t be room temperature this case the sensor must be removed and allowed to cool down to the 10 C to 32 C range NE C1453 MEASUREMENTS AND ADJUSTMENTS 1 Adjustment of Primary latch switch Secondary latch switch and short switch A When mounting Primary latch switch Secondary latch switch and short switch to door hook assembly mount the Primary latch switch the Secondary latch switch and the short switch to the door hook assembly as shown in Figure NOTE No specific adjustment during installation of Primary latch switch Secondary latch switch and short switch to the door hook is necessary B When mounting the door hook assembly to the oven assembly adjust ihe door hook assembly by moving it in the direction of arrow Figure so that the oven door will not have any play in it Check for play in the door by pulling the door assembly Make sure that the latch keys move smoothly after adjustment is completed Completely tighten the screws holding the door hook assembly to the oven assembly 2 Measurement of microwave output The output power of the magnetron can be determined by performing IEC standard test procedures However it is
40. ven temperature drops below the predetermined temper ature the digital programmer circuit generates power relays control signals again at the timing predetermined NOTE 1 After grill process if oven temperature is higher than predeter mind temperature fan motor rotates for 5 minutes at maximum time to coo the electric components and oven UPPER HEATER OUT SIDE RY7 GRILL UPPER HEATER IN SIDE RY6 or ov oc HeMR Grill Cooking Category 1 OVEN TEMPERATURE UPPER HEATER IN SIDE RY 6 UPPER HEATER OUT SIDE RY 7 FAN MOTOR RY 9 CIRCULATION MOTOR RY 10 83008 1453 4 Combination cooking control Combination cooking is accomptished by operating the microwavo and heater mode alternately during one combination cooking cycle There are 2 combination mode 1 Grill combination Grill Microwave 2 Convection combination Convection Microwave A The digital programmer circuit generates the power relays control signals at a specific timing as shown in figure B When the oven temperature reaches the predetermined temperature the digital programmer circuit stops supplying power relays control signals resulting in heaters to turn off During this digital programmer circuit continues supplying power relay 1 3 control signal so that rowave activity continue at predetermined duty ratio as shown in fi gure The microwave activity continue to cycle until

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