NE-C1275 NE-C1475
Contents
1. VDD 2 5 R319 59 O 10 400 1K TP18 BD4928G 5 Lis B R25 7 20 7W049H RY9 1 0 5W SE 5 VSS Vss LD 12V UL125V DVER 5 a VREF Y CN3 PS2501HL 4 GND 1 ft NATRST ECN20 5 LEAD2 43 2 al CLOCK FREQENCY 44 Door 4 Switch gt 21 R 5 TS Q310 R312 103 C1 B 52 16 R3114 1432 10 DOOR SIGNAL TP43 43 Q0 100 LE 20 2 3 D311 DONER C313 Ee 156133 77 0310 104 C1 ov R313 ERA1506 C314 R 22K c11P42 R317 104 C1 28 1037 8 P15 2 0313 R318 paid Ol 77 105 C1 2 1 cun 185133177 103 C1 acs 33K_C t 22 R316 03121 1K Ct Q180 CN11 Q813 o 12K 0314 pl FRANSKA ma 2902412 59 59 3 ECN20 13W1249 25 3018 R310 D 100 _ 1 856 12VH2 D220 Q220 R220 1K C1 55 55 1SS133T 77 25 2412 P47 D P61 56 4 1SS133T 77 P60 G5G 12VH2 R225 10K C1 D222 Q223 58 1SS133T 77 25 2412 DJP62 G5G_12VH2 R227 10K_C1 D223 Q233 1SS133T 77 25 2412 53 RY5 050 12VH2 D224 54 155133 77 D P46 O 5 53 ID 45 0226 52 1SS133T 77 28C2412K P44 8 50 12VH2 155133 77 D 4 R228 R229 CN2 2 330 330 TECN20 7R049H T 9 P42 6 A R242 10K C1 T12. NI aadis LNO H31V3H HAddN H3 V3H LMS VAY ZHOS 0622 ANOO 44008 exHrlo v 900000000900 o9 d 83113 3SION LNOYS tices RA IR 5 jou si LNOU3 si 1000 31ON 39V L 10A NOILNVO 1275 1475 4 WIRING DIAGRAM NOTE When replacing check the lead wire color as shown Colors shown by indicate colors of lead wire connector housing RY2 TO CNS SECONDARY LATCH SWITCH RY4 TO EXTENSION CONNECTOR SHORT SWITCH RY3 RY 1 PRIMARY LATCH SWITCH SW4 RY8 RY7 RY6 RY5 MAGNETRON FRONT MAGNETRON BACK BL w ORANGE BL BR BROWN R RED a W H V TRANSFORMER FRONT BLACK VIOLET GREEN H V TRANSFORMER BACK 5 3 5 BPQ 086 1 10 1275 1475 5 DESCRIPTION OF OPERATING SEQUENCE 5 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 except for High power position The digital programmer circuit controls the ON OFF time of power relays contacts in order to vary the output power of the microwave oven The rel
3. 9 P41 R232 D 330 0 25W 5 48 HEATER TRIACL 7 P40 uf FAN MOTOR R247 CIRCULATION 2 2 a R248 TP21 7 10K C1 2 7K C1 21 155133 77 25 2412 1 1 211 e ANTENNA R250 MOTOR _ _ 10 C1 TP79 P C BOARD HU Mile 19 A605S 3C50GP 0 1432 1 871 87 ms 680 mi BEEP _ TP78 THD 28 2412 A 0215 VOLUME 21D P86 FAC E R552 1432 180K 22 42 C211 TP77 BUZZER o 77 71 e XA 103_C1_B 85 3 7KHZ 0551 0551 46 23 8 2SD1991A 196 51 CN5 W _ _____ 2 3 S 3C5 BP D 35 1275 1475 Stat 1 110 VLC1 E 103 C1 TP2 2 103 C1 1K C1 C112 3 4 R113 Nc 1K C1 P33 DP TPES sop 82 TP82 LCD2 6 ___ P31 D 81 3 E P30 NC TLGV 1020 K J t M Pes D 75 1 75 LCD4 pig 74 oTP74 LCD5 TLGV 1020 Pez D Lone 2 P81 TLGV1020 TLGV 1020 71 7 LCD8 ps 70 69 gTP69 1010 0 8 68 CD11 LCD BACKLIGHT o TP67 LCD12 p7o 66 66 CD13 5 65 CD14 64 LCD15 ida 94 e 1001 63
4. 63 LCD16 67 D P66 92 62 LCD17 1 P65 61 LCD18 60 Dr 41 0 54Vad LY Internal Pull Down R40 100 C1 osava TIRE ree greas osava Er ger osavas DISP 110 LCD3C5 Sam MM LCD18 FI 10 7 ANG PAS 5 R47 100 C1 R48 100 C1 E 8 23 41228 491100 C1 ECN20 3B l MEN TES TP20 Thermister ANo PAo 22 es nemen 2 2K C1 1 C440 104 C1 76 9 E CN10 L390 ECNSD AXA273021 4 20A390U 9 Ir DTC143ZKA 70 4 1 SDCARD 0 c P 30 30 gt gt gt E Pot 2 132 1TP32 R398 100 C1 33 9 TP33 DATA OUTPUT 8399 100 C1 Q 2 DATA IN 2 5 9 34 DATA INPUT R400 100 C1 Onn e aid P04 S802 5 CLOCK 35 CLK OUTPUT R401 100 C1 8881 117 TP36 Card Detection INPUT R402 100 C1 L Wen E 8 DAT1 etection 87
5. 37 1 CONTROL PANEL NE C1275 1475 Display Window The cursor will illuminate to indicate the programme set Always check the cursor position before you ress Start 4 BE BEE 3 D Microwave 2 Grill Fan Grill Convection Preheat ii Control Panel 6 Cooling 7 Microwave Power Level Cooking Stage Indicator N Convection Q Stop Reset Prog Lock 8 Preheat 9 1 Start n Grill Cooling 19 C2 1 Number Pads 2 Prog Programme Pad 3 Microwave Pads 4 Grill Pad 5 Fan Grill Pad 6 Convection Pad 7 Stop Reset Pad Prog Lock Programme Lock Pad 9 Preheat Pad Combination Pad 0 Cooling Pad 2 Oven Lamp Pad 43 Start Pad 1275 1475 2 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 CONVECTION or COMBINATION programs 2 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 X DISPLAY OPERATION X DISPLAY 1 Plug the power supply cord into wall 1 Open the door and place a food in the outlet oven and close the door Open the door and place a water loa
6. STEP 4 Check operation by following Defective Back side procedure magnetron circuit 1 Disconnect Back side of gt STEPS magnetron thermal cutout No heat Defective Front side 2 Operate oven at High power for magnetron circuit Front magnetron circuit only gt STEPS Open or loose connection of high Abnormal Repair loose connection voltage circuit especially magnetron No heat STEP 6 filament circuit Large contact resistance will bring lower magnetron filament voltage and causing magnetron to lower output and or intermittent oscillation Check high voltage component for Check high voltage assumed defective front or back component according to side circuit component test procedure H V Transformer 2 if it is H V Capacitor H V Diode Magnetron 23 1275 1475 TROUBLE 3 Oven does not start cooking 1 Oven does not accept key input Program 1 Key input is not in sequence Refer to operation procedure 2 Open or loose connection of membrane key pad to DPC Flat cable Open membrane key board Defective DPC Hefer to DPC troubleshooting 2 Oven lamp turn on when oven is plugged Misalignment or loose wiring of secondary Adjust door and latch switches in with door closed latch switch Oven can program but not start Defective secondary latch switch 3 Timer starts count down but no microwave 1 Off alignment of latch switches Adjust door and latch switches oscillation Defective
7. A620X32308P 7 SWITCH 1 V 15G 1ED M A6202 3xX2 51 0 35A 2 J621B3C50BP 7 H V TRANSFORMER 2 J6ZIB3CGOEU 7 H V TRANSFORMER 2 A621932308P INSULATION COVER 1 ANEG230Pl0GN FUSE 1 A62383230GP 3 AG30G3CSOBP CHEATER A U 74 AG30G3CGOEU BEATER A U 74 A630232308P INSULATION COVER B 2 AG31USCSOBP CHEATER EO 2 6408 2050 WASHER A641732308P SUPPORT A __ 2 6437 1600 GASS PLATE 1 A64643230B8P 7 HEATER SUPPORT B 2 A65533230BP 7 BRACKET 2 6145 1 30 THERMAL CUTOUT B 1 A65953170GP FUSEB 1 A05423230BP 7 CAUTION LABEL 1 AGS2Y3CGOEU NOISE FILTER 1 A901A32308P AC CORD W PLDG 1 A901A3230GP AC CORD W PLDG XWNANEG5GV 7 SPACER 1 1454740 7 SCREEN A ANE9080 730 1 ANE9107A20GN 7 HOLDER 11 A97213230BP 1 A972232308P BRACKET B 1 A972332308P 7 BRACKET C 1 A98243230BP 7 GLASS PLATE BRACKET 1 AESMTG35CO0 7 1 4kVA NE C1275BPQ 1 4kVA NE C1475EUG 16A N NE C1275BPQ NE C1475EUG CIRCULATION FAN CASE 1 25A NE C1275 BPQ N NE C1475 EUG NE C1457 EUG CABINET YELLOW 1 1 1 2 1 1 1 1 1 1 3 1 1 1 1 1 1 1 1 1 1 1 1
8. CORDER MOD0510275C2 Service Manual Microwave Oven NE C1275 NE C1475 Specifications 230 240 V AC Single Phase 50Hz Power Requirement NE C1275 NE C1475 2 000 2 350W Microwave 1 850 1 950W Grill 1 950 1 950W Convection Output 1 150 1 350W Full Microwave Power IEC 705 1 800 1 840W Grill 1 800 1 800W Convection Microwave Frequency 2 450 MHz Oven Cavity Dimensions 406 mm W X 336 mm D X 217 mm H Specification subject to change without notice 2005 Matsushita Electric Industrial Co Ltd All Panasonic ights reserved Unauthorized copying distribution is a violation of law 1275 1475 WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public It does not contain warnings or cautions to advise non technical individuals of potential dangers in attempting to service a product Products powered by electricity should be serviced or repaired only by experienced professional technicians Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death 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
9. o o N o o o o o SUO o o 0 w o o m m o H o 37 1275 1475 33K 1 16W 5 AERJ3GSYJ333 4 7K 1 16W 5 AERJ3GSYJ472 7500 1 16W 5 AERJ3GSYJ751 2 2 1 16W 15 AERJ3EKF2201 82 1 16W1 AERJ3EKF8202 1MF 10V 1 105210 Chip Capacitor Chip Capacitor R10 R182 Chip Resistor 2 2K 1 16W 5 AERJ3GSYJ222 R313 R381 Chip Resistor 1 22K 1 16 5 AERJ3GSYJ223 1 1 2 7 1 16W5 AERJ3GSYJ272 237 R241 R245 R249 Chip Resistor C317 C398 C14 C27 C313 C314 C319 C380 C440 C40 C41 C42 Chip Resistor 10 7 0 1MF 25V 1 104725 Chip Capacitor 0 0001MF 50V AECU1C101J50 C43 C44 C381 C382 C110 C111 C112 C211 C312 C318 C DISP110 0 01MF 50V 1 103250 Chip Capacitor MEC MN101C66G Display sheet BOJAMK000017 Diode Si 1 5A 0000387 H 55 19 AEICP25011HL TLP665J D4 S 22MF 450V 105C 0 1MF 250V 1000 1W 5 2000 1 2W 5 3300 1 4W 5 MACO White 7 3 B3 7 5 B XASK 1 A LF SN Red 7 3 pin B3 7 5 B XARK 1 A LF SN White 13 5 pin B5 7 5 B XASK 1 A LF SN White 8 pin BO8B PASK 1 LF SN 10FDZ BT M S LF SN ALD112A04J 26 27 230 0000128 Photo Coupler IC ECA2WHG220E Electric Capacitor 1 N C230 R230 R23
10. 111 dni write Protect INPUT 416 R403 100 C1 BEET ja i in 12 r CX320 kl VSS1 osc2 F 8MHz C398 6 18 VSS2 8 11 14 1104 7 1 71 CN8 i MMDD ECNPA 8B 8B lt 16 33 TC380 ag BR24L02F C397 C396 WRITE PROTECT SW C380 i 103_R1 103_R1 GND1 GND2 UNABLE TO ABLE TO 2 R981 104 C1 GND RF GND RF NB 52 CARD N OPEN OPEN OPEN 2 4 8 P C BOARD FU CARD OUT OPEN OPEN CLOSE LE NB Po E 605 50 ___________________________ ee C381 C382 101 C1 101 4 0 S 3C5 BP 36 1275 1475 18 DIGITAL PROGRAMMER CIRCUIT PARTS LIST Ref No Part Pcs Set Remarks DISP110 Display holder D27 D220 Diode Si 0 1A D222 D223 0224 D225 226 2227 Diode Si 0 5A D229 D230 D232 oe Diode Si 0 1A D43 D44 D45 033 1 6 00004 ECEA1CKA220B Al AESS133T 77 D311 D313 ZD220 MTZJ11BT77 20222 2210 1506 RB721Q 1 16 5 1 2 56K 1 2W 5 100KO 1 4W 5 1 2 1 4W 55 1 4W 5 1 4W 5 KTA200 Y AT P 22MF 16V 0 0022MF 1KV 470MF 16V FC 8000A 39KO 1W 5 10 1 2W 5 Red 3 pin AEEMMF00703R White 3 pin 55 1 LF SN White 5 pin 25 2412 14
11. Primary latch switch Defective short switch Defective DPC TROUBLE 4 Other trouble 1 F01 appearsin the display with 1 Burning food in the oven cavity due to It is appeared when exhaust temperature is continuous beep sounds over cook too high 2 F30 the display 1 Open or shorted oven temp sensor It is appeared 1 minute after start pad is 2 Open or loose oven temp sensor pressed connector 3 Defective DPC F 09 appears the display 1 Wrong power supply frequency Use only specified power supply frequency 4 F44 the display 1 Shorted membrane switch It is appeared when membrane switch is 2 Defective DPC shorted for more than 2 minutes 5 No beep sound 1 Check beep sound level If beep sound level is set at O change it 2 Defective buzzer level 3 Open or loose connection 4 Defective DPC 6 F 00 appears in display EEPROM error 7 F appears in display Memory card trafic error 2277 8 F 35 display Oven is not heated up min 80 C w in 10minutes 9 U 16 appears in display SD Card is locked 10 U 17 appears in display No memory or faulty SD Card 7 11 019 appears in display No SD Card installed ALL LL 24 1275 1475 TROUBLE 5 Trouble related to Digital programmer circuit SYMPTOM STEP CHECK RESULT CAUSE CORRECTIONS No display when oven is first 1 12V Line voltage plugged in and door is open 3 3V Line v
12. for your applicable product specification BPQ ForUK CONTINENTAL EUROPE CAUTION About lead free solder PbF Distinction of PbF PCB PCB manufactured using lead free solder will have a PbF stamp on the PCB Caution Pb free solder has a higher melting point than standard solder Typically the melting point is 50 70 30 40 higher Please use high temperature solder iron and set it to 700 20 F 370 10 Pb free solder will tend to splash when heated too high about 1100 F 600 C CONTENTS Page 1 CONTROL PANEL lt 3 2 OPERATION PROCEDURE 4 3 SCHEMATIC DIAGRAM 9 4 WIRING DIAGRAM I 10 5 DESCRIPTION OF OPERATING SEQUENCE 11 6 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 44 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 15 8 COMPONENT TEST PROCEDURE 18 9 MEASUREMENTS ADJUSTMENTS 20 Page 10 TROUBLESHOOTING GUIDE 21 11 EXPLODED VIEW AND PARTS LIST 26 12 PARTS LIST MM 28 13 DOOR ASSEMBLY 31 14 ESCUTCHEON BASE ASSEMBLY 32 15 PACKING AND ACCESSORIES 33 16 WIRING MATERIAL 34 17 DIGITAL PROGRAMMER CIRCUIT 35 18 DIGITAL PROGRAMMER CIRCUIT
13. or higher voltage batteries should be used to check the front to back resistance of the diode otherwise infinite resistance may be read in both directions A normal diode s resistance will be infinite in one direction and several hundred in the other direction NE C1275 1475 NOTE OHMMETER SHOULD HAVE A MINIMUM 6 VOLT BATTERY FORWARD REVERSE SOME 08 196M 8 4 Magnetron Continuity checks can only indicate an open filament or a shorted magnetron To diagnose for an open filament or shorted magnetron 1 lsolate magnetron from the circuit by disconnecting the leads 2 A continuity check across magnetron filament terminals should indicate one ohm or less 3 A continuity check between each filament terminal and magnetron case should read open ANTENNA COOLING FIN FILAMENT TERMINALS 04 031M 8 5 Membrane key board Membrane switch assembly Check continuity between switch terminals by pressing an appropriate pad on the key board The contacts assignment of the respective pads on the key board is as shown in the schematic diagram of DPC VOLTAGE CAPACITOR 04 032M 1275 1475 8 6 Protector diode 8 To test the oven temp sensor 1 Isolate the protector diode assembly from the circuit by thermistor disconnecting Its leads This sensor monitors the heat produced by the heater circuit 2 With the ohmmeter set on the highest resistance scale maint
14. 1 1 1 1 2 1 2 1 1 1 1 1 2 1 1 1 2 2 2 1 1 3 2 2 1 2 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 600V 30A 29 1275 1475 12 12 557568 2 T LU NE C1475 EUG 5x10 HINGE SCREW BLACK 132 MATERIAL J 17 17 18 0 1 2 3 4 5 7 8 30 31 32 33 34 35 36 37 38 39 42 43 44 45 47 30 1275 1475 13 DOOR ASSEMBLY 8 3 5 BPQ ES 3018 3850 KEY LEVER B ____ 1 SCREENA 20 jaxoussom 1 22111111 poor ers fawe3021800a SPRING 1 11111 00000 mum PEN ____ 1 Ws ss SS ____ ________ 1 WS SCS poor screen B 0 1 5 Dia 1 00000000 2 mr SCREW o SCREW pps DOOR PANEL 18 021 31863 50 DOOR PANEL 21 1863 60 0 31 1275 1475 14 ESCUTCHEON BASE ASSEMBLY S 3C5 BPQ A01573C50BP NAME LABEL 71 NE C1275BPQ A01573C60EU NAME LABEL 1 1475 0 ANE0962000AH A603L3C50BP D P CIRCUIT U 1 N
15. 1 R232 ECQU2A104MNA ERG1SJ101P ERQ12AJ201P ERO14AJ331P ETS19AA2B1AC N K1KA03AA0134 N2 K1KA03AA0135 K1KA05AA0134 K1KA08AA0201 K1MN10AA0040 RY9 RY10 11 RY12 RYl RY2 K6B1AGA00140 Y4 RY5 RY6 RY7 K6B1AGA00212 RY8 DISP110 L5AAAFD00029 LCD Display 1 1 N 2 Q Q 0 4 N N G5G 1A ALE73B12 CG2020 TTNC IC25 2555 5 iS IS 0 g H 5 H H H o d d 0 0 QIQ Q o H H H e 0 N 41 N 0 H H H 4 0 IN N o EE T T S w H tg D o D Pl Pl Pl D D D N o o 0 W H o ul o N WP 596 F S 3C50BPQ 38 Printed in Japan
16. 6 Ww W gt J gt 8 4 Capaci H 5 Chip Transistor Si 0 2W N 25 1037 25 3018 106 AESCA3ZKE Q211 Q311 Chip Transistor Si 0 2W Q314 B1CBGD000001 Chip Transistor Si 0 2W 1 0214 0215 Chip Transistor Si 0 3W Q212 Q310 5 14 0180 0181 B1GDCFJJ0002 Chip Transistor Si 0 3W 1 D182 D183 D184 D185 Chip LED D186 D187 1 10 0 1 11333 25 10310 7 0000447 BD4928G AEICBD4928G 10380 7 000063 BR24L02F WE2 R40 41 R42 DOGB101JA002 Chip Resistor 16 1000 1 16W 5 AERJ3GSYJ101 R43 R44 R45 R46 R47 R48 R49 R398 R399 R400 R401 R402 R403 DOGB102JA002 Chip Resistor 11 1K 1 16W 5 AERJ3GSYJ102 R112 R113 R213 R214 R220 R224 R251 R216 DOGB103JA002 Chip Resistor 18 10K 1 16W 5 AERJ3GSYJ103 R225 R234 R238 R242 R246 R250 R312 R314 R317 R310 R318 DOGB104JA002 Chip Resistor 2 100KO 1 16W 5 AERJ3GSYJ104 215 D0GB153JA002 Chip Resistor 1 15 1 16W 5 AERJ3GSYJ153 TLGV1022 T14MAT5 0 3 0 UJ Ui W m H m H e 8 a 816 g o o 5 P E 0 H 2 D UJ Q N o QIN o w 11 lt A Ww o 0 o o C o o 2 o o H amp o o Jg
17. BPS 2 gt RAIL RIGHT OLD 30 20203230 A202K3230BP w 32 33 34 35 1 1 w W 1 38 39 43 28 1275 1475 as MATEMIAL 1 55 a 2259323082 MATERIAL D 1 226132308 ADIABATIC MATERIAL 1 497 227732308 rower HEATER PANEL 1 HEATER PANEL 1 ADIABATIC MATERIAL G 1 52 a236532308 MATERIAL 2 537 jaxonszsxome 100 sa 323062 poor 52 7 a3136 3470 HOOK 1 56 HookssacR B 1 57 as1398 3470 roo sacer 1 5 239800 rever SPRINGA 0100 ____ arr coreo 1 7 66 7 132308 7 16132308 ran SPACER A 80 Pc BOARD a U ea 1 Bo b be be 85W V 16G 3E6 V 15G 3C26 ANE61448VOAP A61455850GP THERMAL CUTOUT NE GN En JA 01 1 01 EE _ VENE CERNI MEE NI 01 21 01 20 NE ME NEN NE 1 16 A f 2 FOR MAGNETRON A61523230BP SOCKET A61983230BP BRACKET 1 24
18. E 1 Oven is dead 1 16A fuse is blown Primary latch switch and short and adjust latch switch switch and door Check high voltage components Component check procedure assumed defective side circuit H V Transformer H V Capacitor H V Diode Magnetron WINDING RX1 Protector diode TERMINALS scALE PRIMARY WINDING TERMINALS 04 038M VOLTAGE CAPACITOR NOTE OHMMETER SHOULD HAVE A MINIMUM 6 VOLT BATTERY FORWARD REVERSE 04 032M m TN FILAMENT TERMINALS oQ 04 039M NOTE Be sure to replace protector diode together with those H V Components 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 22 1275 1475 SYMPTOM STEP CHECK RESULT CAUSE CORRECTIONS Oven is dead pn Fuse are OK Normal Check DPC Open or loose lead wire harness SYMPTOM STEP CHECK RESULT CAUSE CORRECTIONS Low microwave output power Heat 1 litter of water for exactly one Greater than 9 4 C Customer education Defective Front or Back magnetron minute at HIGH power and check Less than 94 Front or Back side circuit temperature rise magnetron circuit is faulty STEP 2 Thermal cutout SW1 Front and Abnormal Heplace and check fan SW2 Back Magnetron motor operation STEPS 3 Power ralay operation Defective relay or DPC a
19. E 1275 RTL W COMPONENT AGO3L3C50EU D P CIRCUIT U 1 NE 1475 EUG RTL W COMPONENT SD CARD SLOT W MEMORY WROTE XTW34108 8 388 A64793C5OBP MEMBRANE SWITCH 1 4898 3840 SCREW 7 1 SLOT COVER 10 A800N 3B40 7 ESCUTCHEON A 1 1 11 ESCUTCHEON BASE 1 12 9620002 CUSHION RUBBER D 1 13 A80023C50BP ESCUTCHEON B 1 5 SLOT COVER 14 A8032 3B40 50 BRACKET 41 15 A8265 3840 PUSH LOCK 1 16 6408 3280 1 NOTE 1 Please order name label together 32 1275 1475 15 PACKING AND ACCESSORIES Cut into three parts when packing WIRE RACK lt Cut into two parts when packing S 3C5 BPQ Part No Part 8 Description Pcs Set A00033C50BP INSTRUCTION BOOK 1 NE C1275BPQ A00033C60EU INSTRUCTION BOOK NE C1475EUG A01023C50BP PACKING CASE PAPER 1275 A01023C60EU PACKING CASE PAPER NE C1475EUG A01043840AP UPPER FILLER A01053840AP LOWER FILLER A01065130AP VINYL COVER 0107580 DOOR SHEET A01083C50BP TRAY PACKING A A01173230BP TRAY PACKING B A01453230BP DOOR SHEET B A01173C50BP TRAY PACKING B A04243C60EU A04203C50BP OPERATING GUIDE A04203C60EU OPERATING GUIDE A06023C50BPS WIRE RACK SHELF U A06033230GP CERAMIC INSULA
20. Record as 1 switch and short switch to door hook assembly mount the 2 Place the beaker in the center of cook plate Primary latch switch the Secondary latch switch and the Set the oven for High power and heat for exactly one short switch to the door hook assembly as shown in Figure minute 2 When mounting the door hook assembly to the oven 3 After completion of the heating cycle stir the water again assembly adjust the door hook assembly by moving it in with the thermometer and note the temperature Record as the direction of arrow in Figure so that the oven door will not T2 have any play in it Check for play in the door by pulling the normal temperature rise T2 T1 for these models should door assembly Make sure that the latch keys move pe more than following chart indicated using the High power smoothly after adjustment is completed Completely tighten selection with the oven operating at the specified line voltage the screws holding the door hook assembly to the oven assembly 9 2 Measurement of microwave output The output power of the magnetron can be determined by performing standard test procedures However it is 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 out
21. TING TRAY A02843560BP NUMBER LABEL A400B3840AP FILTOR XYN4 C10V SCREW A06433C50BP WIRE RACK FOOT ANE01072Q10AP DOOR SHEET XNG4V NUT 4 STAINLESS NE C1475EUG NE C1275BPQ NE C1475EUG 59 119 119 119 110 FOR WIRE RACK 4x10 STAINLESS 33 1275 1475 16 WIRING MATERIAL MAGNETRON MAGNETRON WA H V CAPACITOR N 4 d E H V TRANSFORMER H V TRANSFORMER W6 W5 WA ANTENNA MOTOR S 3C5 BPQ Remarks W3 7 A61393230BP INSULATION TUBE 1 wa 7 A509665207P FERRITE CORE 2 7 PROTECTOR DIODE B 1 REF NO 80 P C BOARD BUZZER PCB A605S3030GP m m ex scouzaiosMlA POLYESTER CAPACITOR 3 POLYESTER CAPACITOR mcouzacs4MLA POLYESTER CAPACITOR 7 00299 000000 OO 240 1 2W 5 mo 2 73 VARISTOR 000 2 sr 0 C1 2 53 C4 CN1 F2 F1 L1 R1 ZNR2 3 R2 34 17 DIGITAL PROGRAMMER CIRCUIT SCHEMATIC DIAGRAM T25 D25 ETS19AA1Y1AC 010 ERA1506 2 952 16 1275 NE C1475 pu X 1 2
22. 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 1275 1475 Combination Convection Microwave SELECTED OVEN TEMP OVEN TEMPERATURE CONVECTION HEATER RY 5 6 UPPER HEATER IN OUT SIDE RY 7 RY 8 FAN MOTOR RY 10 CIRCULATION MOTOR RY 11 M LOW Yi FRONT RY 3 BACK 96 023M 6 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING Unlike many other appliances the microwave oven is a high voltage high current apparatus Although it is safe to operate extreme care should be taken during repair CAUTION Servicemen should remove their watches and rings whenever working close to or replacing the magnetron 6 1 Check the earthing grounding Do not operate on a 2 wire extension cord The microwave oven is designed to be used in a completely earthed grounded condition It is imperative therefore to make sure it is properly earthed grounded before beginning repair work 6 2 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 and short the terminal of the high voltage capacitor terminal of lead wire from dio
23. ains the oven temperature the user has selected measure the resistance across the protector diode Normal room temperature especially in a kitchen can vary terminals anywhere from 10 to 32 The reading across the oven Reverse the meter leads and again observe the resistance sensor thermistor should be within 100K ohm to 500K ohm reading when reading in an area within the 10 to 32 room A normal protector diode s resistance will be infinite in both temperature range directions If the resistance reading is out of the range stated here the It is faulty if it shows continuity in one or both directions sensor is defective and must be replaced with sensor unit NOTE 1 When measuring resistance disconnect the 4 pin connector CN4 from the DPC otherwise a false reading may be indicated 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 In this case the sensor must be removed and allowed to cool down to the 50 F 10 C to 90 F 32 C range 9 MEASUREMENTS AND ADJUSTMENTS 9 1 Adjustment of Primary latch heating time should be as accurate as possible switch Secondary latch Output power performance test procedure J switch and short switch 04 039M 1 Fill the beaker with exactly one litre of tap water Stir the water using the thermometer and note the 1 When mounting Primary latch switch Secondary latch temperature
24. ation between indictions 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 percentageof microwave power since approximately 2 seconds are required for heating of magnetron filament NOTE 2 ON OFF time of power relays are changed by digital programmer circuit when remaining cooking time or selected cooking time are within 1 minutes 30 seconds at MED LOW SIMMER and Defrost cooking mode POWER POWER RELAY ON OFF TIMING OF POWER RELAY RY 1 FRONT RY 3 BACK HY 1 FRONT RY 3 BACK RY 1 FRONT RY 3 BACK 1 FRONT RY 3 BACK DEFROST 1 FRONT RY 3 BACK RY 1 FRONT RY 3 BACK 11 100 024M 1275 1475 5 2 Convection cooking control The digital programmer circuit controls the ON OFF time of upper and convection heater inorder to control the oven cavity temperature see table and figure 1 The digital programmer circuit generatesthe power relays control signals at a specific timing as shown in table 2 When the oven reaches the selected temperature the digital programmer circuit senses the temperature through oven temp sensor and stops supplying 12V DC to the power relays resulting in turn off of uper and convection heaters After the heaters have been turned off the oven temperature will continue to increase a while then decrease as shown in figure 3 W
25. crowave cycles at 1 100 times means 34500 Times 2 4 While pressing START pad press pad The display shows the total hour of 1 1 means 1500 Hours microwave time at 1 100 hour 3 After 3 seconds display returns to 0 NOTE When total number of heating cycle hour exceed 9999 the count will return to 1275 1475 3 SCHEMATIC DIAGRAM L 0 LIN Odd SO S Ario L On3asZtrLO 3N 115870 Od8SZ cLO 3N HOLIOVdVO 39V L1OA He 4 1 ADVLIOA H IH HOLON VNNALNV SW NOILVINOIO NVA AN AV1ldd HOLIMS 1 5 9MS HOLIMS HO1V1AHVONOO3S SMS HOLIMS HOl1V1AHVIWNIHd YMS N3AO INO 110 1VWH3HI EMS INO LNOTVNHIHL ZMS LNOHJA NOHLINDVIN INO 110 IMS HOLSIHVA c ISNI Ao SISSVHO lt 9 1015 ds OX GXZX9XSXvXeXeXo QHVO8 A33 21900099980 ZHW8 H3 INVHOOHd TVLIOIG LINDYIO 227 COOH GX XEXeXO HOLSIWH3H L ame HOSN3S 7 12200 2 44008 exHrlo v O A 5 9 9 ova
26. d Press CONVECTION pad to set 200 C in the oven and close the door Press MICROWAVE pad once to set Set the desired time by tapping 1 5 0 0 High power Set the desired time by tapping 1 0 0 Press pad Max time you can set High Medium gt 15 mins Low Simmer Defrost Stand 60 mins Press START pad When the time is up you hear 3 beeps sound When the time is up you hear 3 beeps Open the door and take food out sound The display goes back to previously setting time Open the door and take the water load Close the door out 1 minute later display will return blank The display goes back to previously setting time Close the door NOTE For 2nd and 3rd stage cooking enter heating program 1 minute later display will return blank between steps 3 and 4 above 1275 1475 3 Grill cooking 4 Combination cooking OPERATION X DISPLAY OPERATION DISPLAY 1 Open the door and place a food in the 1 Open the door and place a food in the oven and close the door Press GRILL LOW pad twice to Grill Low Set the desired time by tapping 5 0 O 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 3 an
27. d 4 above oven and close the door Press CONVECTION pad to set 200 C Press MICROWAVE pad times to set Low power Set the desired time by turning the timer dial Press START 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 1275 1475 5 Setting the Memory Program 6 Memory Program Cooking OPERATION DISPLAY OPERATION X DISPLAY 1 Open the door 1 Open the door and place food in the oven and close door Press PROG for more than 2 2 Press Two digit number EX 12 for seconds P flashers in the display Microwave High power 1minute Press 1 and 2 key to set program Press START pad number such as 712 Press pad once to High power 7 Setting the Program Lock OPERATION X DISPLAY 1 Open the door Set the cooking time by tapping number Pad 2 Press LOCK pad and hold until PL appears in the display Press pad 3 After 3 seconds display returns to 0 7 After 3 seconds display returns to O NOTE When program lock is activated in ONE TOUCH mode i e Press required memory program number and oven NOTE Program can be memorized up to 99 immed
28. de to chassis ground with and insulated handle screwdriver or insulated jumper lead wire to discharge 14 WARNING There is high voltage present with high current capabilities in the circuits of the high voltage winding and filament winding of the high voltage transformer It is extremely dangerous to work on or near these circuits with the oven energized DO NOT measure the voltage in the high voltage circuit including filament voltage of magnetron WARNING Never touch any circuit wiring with your hand nor with an insulated tool during operation 6 3 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 confirmed A The door is tightly closed B There is no broken hinge or door arm C The door seal is not damagd D The door is not bent or warped E There is no other visible damage 6 4 When parts must be replaced remove the power plug from the outlet HIGH VOLTAGE CAPACITORS 08 102M To Discharge 2 High Voltage Capacitors touch chassis side first then short to the high voltage capacitor terminal NE C1275 NE C1475 Important Note 1 High voltage above 250 volts exists at following parts during oven op
29. door and while pulling the door toward you work the upper hinge out through the hole in the oven 3 Remove 4 screws holding the door C 4 Remove the door C by carefully pulling outward starting from the upper right hand corner 5 Remove 2 screws holding door E 6 Separate the door A from door E by carefully freeing catch hooks on door A while pulling outward 7 Remove the door key spring and the door key 8 Remove 2 screws holding door handle 9 When mounting the door to the oven be sure to adjust the door parallel to the bottom line of the oven face plate by moving the upper hinge and lower hinge in the direction necessary for proper alignment Also adjust so that the door has no play between the inner door surface and oven frame If the door is not mounted properly microwave energy may leak from the clearance between the door and the oven 01 009M SCREWS FOR DOOR HANDLE 08 188M 01 027M 7 5 1 To remove the antenna motor carefully place the unit on its left side Antenna motor 2 Remove 2 screws holding motor cover 3 Remove 2 screws holding antenna motor NE C1275 NE C1475 4 Disconnect motor lead wire ANTENNA MOTOR 08 187M 7 6 Floor shelf and or moving antenna 1 Insert a philips type screwdriver or equivalent approx 2 in shaft length in the hole of left side oven wall as shown in Figure 2 Carefully lift up the floor shelf by using the screwdriver unti
30. e of escutcheon base is cleaned sufficiently so that any problems shorted contacts or uneven surface can be avoided NOTE 3 Alignment position of membrane key board is as follows see figure Membrane key board Right and lower edges 7 3 Power relays NOTE Be sure to ground any static electric charge built up on your body before handling the DPC NOTE Do not use a soldering iron or desoldering tool of more than 30 watts on DPC contacts 1 Using solder wick or a desoldering tool and 30W soldering iron carefully remove all solder from the terminal pins of the power relays 2 With all the terminal pins cleaned and separated from DPC contacts remove the defective power relay s and install new power relay s making sure all terminal pins are inserted completely Resolder terminal contacts carefully LIFT UP AIR GUIDE NG A I Us AIR GUIDE 1 o GROUDING VA LEAD WIRE OS IL A d SLIDE TO N RELEASE 08 184M MAGNETRON 05 023M 16 HOW TO DISCONNECT SPECIAL LOCK CONNECTOR D PULL CASE DO NOT PULL LEAD WIRE 08 185M MEMBRANE KEY BOARD 0000 0000 NUDO RY8 RY7 RY6 09 200 09 201M HOW TO DISCONNECT POSITIVE LOCK CONNECTOR LOCKING CLIP POSITIVE LOCK CONNECTOR 08 032M 7 4 Door assembly 1 Remove 2 screws holding the upper hinge to the oven 2 Open the
31. eration Magnetron High Voltage Transformer High Voltage Diode High Voltage Capacitor 2 the microwave oven is operated with incorrect installed door hinge or magnetron it can cause microwave leakage of over 5mW square centimeter Hence it is absolutely necessary to check if magnetron and door hinge are correctly and safety installed after repairs or replacement 6 5 1 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 Confirm after repair 2 Make sure that all electrical connections are tight before inserting the plug into the wall outlet 6 6 Avoid inserting nails wire etc through holes in unit during operation Never insert a wire nail or any 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 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 microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized CAUTION High voltage parts may become u
32. hen the oven temperature drops below selected temperature the digital programmer circuit senses the oven temperature and starts supplying 12V DC to the coils of Convection Cooking 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 asshown in figure NOTE 2 After convection 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 Heater ON OFF Time for Convection Cooking IN SIDE OUT SIDE HEATER mocz s 5 Selected oven SELECTED OVEN TEMP OVEN TEMPERATURE CONVECTION HEATER RY 5 6 UPPER HEATER IN SIDE RY 7 UPPER HEATER OUT SIDE RY 8 FAN MOTOR RY 10 CIRCULATION MOTOR RY 11 5 3 Grill cooking control 1 The digital programmer circuit generates the power relays control signals at a specific timing as shown in figure 2 When the oven temperature reaches the predetermined temperature the digital programmer circuit stops supplying power relays control signas resulting in both upper to turnoff 3 When the oven temperature drops below the predetermined temperature the digital programmer circuit generates power relays control signals again at the timing predetrmined NOTE 1 After grill process if oven
33. iately starts 8 To Release the Program Lock OPERATION X DISPLAY 1 Open the door 3 After 3 seconds display returns to 0 2 Press LOCK pad and hold until P appears in the display 1275 1475 9 Preheat 11 To Select Beep Tone Level OPERATION X DISPLAY OPERATION X DISPLAY 1 Press PREHEAT pad 2 1 Open the door ond 2 Press START pad 2 Press pad for 2 seconds Preheat temperature will be displayed and you may adjust it 3 Press START pad to chose sound level 3 Once oven has reached preheat 2 22 Fd I e g twice for Middle temperature P flashes If not used 5 oven will automatically switch off after 1 hour N 4 Press pad 10 Cooling OPERATION X DISPLAY 1 Press pad 5 After 3 seconds display returns to 0 2 Press START pad 3 When finish cooling the display goes to blank The oven will cool in 3 30 minutes depending on temprature 70 1275 1475 12 To Read the Cycle Count OPERATION X DISPLAY 2 1 While pressing START pad press MICROWAVE pad The display shows the total number 2 Lig I LOL means 125000 Times of heating cycles at 1 100 times 2 2 While pressing pad press 5 pad The display shows the total hour of heating time at 1 100 hour 2 3 While pressing START pad press 6 pad The display shows the total number of mi
34. l the floor shelf is lifted up over the level of oven opening front 3 Remove the floor shelf by lifting it up from oven front To replace moving antenna 4 Remove the moving antenna by simply lifting it up off 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 TIL 4 A 77771 11111 01 043 COVER SHOULD INSTALLED INWARDS OVEN SIDE 7 7 7 72222714 27772262 TABLE SIDE 08 189M 17 1275 1475 7 7 Convection Heater 1 Remove 10 screws holding back panel RELEASE HEATER PANEL 2 Disconnect heater and circulation fan motor lead wire RELEASE connector HOLDER 3 Remove a screw holding exhaust guide 4 Remove 5 screws holding heater panel 5 Slide up heater panel unit to release from oven cavity 6 Remove 6 screws holding heater support and heater NOTE After oven has been used the internal surface of the cavity may become permanently dark Please note this condition is normal and it does not affect ovens performance 08 190M TIGHTEN LOOSE HEATER SUPPORT 08 191M 7 8 Upper Heater 1 Disconnect upper heater lead wire connector EXHAUST GUIDE bs 4133 2 Remove 1 screw holding heater support 3 Remove the heater by pulling it out HEATER SUPPORT 08 193M 05 030 8 COMPONENT TEST PROCEDURE CAUTION 2 N
35. ncovered when outer cabinet is removed 7 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 7 1 Magnetron Front and Back 1 Discharge the high voltage capacitors 2 Remove 5 screws holding air guides d Disconnect magnetron lead wire connectors and grounding lead 4 Loosen wire harness and lift up air guide g Remove 4 screws holding each magnetron e Remove 2 screws holding thermal cutout NOTE To prevent microwave leakage tighten mounting screws 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 15 7 2 Digital programmer circuit DPC Remove 1 screw holding grounding strip tab of membrane switch 2 Remove 2 screws holding escutcheon base and slide the escutcheon base upward slightly with door opened 2 Disconnect all connectors from DPC 4 Remove 3 screws holding DPC To replace membrane key board 1 Bend escutcheon A catch hooks straighten and separate escutcheon A and base 2 Push the upper part of key board display window from back of escutcheon base and peel off membrane key board 1275 1475 1 The membrane key board is attached to the escutcheon base with double faced adhesive tape Therefore applying hot air from A hair dryer is recommended for smoother removal NOTE 2 When installing new membrane key board make sure that the surfac
36. oltage Abnormal IC1 Vdd voltage No key input Membrane switch continuity Normal Microwave power relay RY1 does 1 pin 55 voltage not turn on at High power operation Normal EZ 2 55 9 Front side magnetron circuit 2 Q220 transistor IC2 Q313 RY 1 Microwave power relay RY3 does 1 pin 56 voltage not turn on at High power operation Normal STEP2 56 3 Back side magnetron circuit 0222 transistor Triac does not turn on pin 50 voltage 2 Shorted 0228 E C start heater 25 11 EXPLODED VIEW AND PARTS LIST NE C1275 NE C1475 5 3 5 BPQ 4 X LEFT SIDE APPEARANCE 26 1275 1475 BACK SIDE HIGHT SIDE S 3C5 BPQ 27 1275 1475 12 PARTS LIST NOTE When ordering replacement s please use part number s shown in this parts list Do not use description the part Important safety notice Components identified by mark have special characteristics important for safety When replacing any of these components use only manufacturer s specified parts 00020005 00200080 92200020 ANEOOOZOOOAB A18073C50BP RAIL RIGHT NEW Ref No a e 16 W W 24 25 26 27 N 29 A33013C50
37. ormal cold resistance readings should be as follows 1 High voltage is present at the high voltage terminal of the high Secondary winding Approx 800 1200 voltage transformer during any cook cycle Filament winding Approx 2 1 is neither necessary nor advisable to attempt measurement of Primary winding 240V Approx 30 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 8 1 High voltage transformer 1 Remove connections from the transformer terminals and check continuity 18 FILAMENT WINDING TERMINALS SECONDARY WINDING TERMINALS 800 120 0 PRIMARY WINDING TERMINALS 04 038M 8 2 High voltage capacitor 1 Check continuity of capacitor with ohmmeter on highest OHM scale 2 A normal capacitor will show continuity for a short time and then indicate 9MQ once the capacitor is charged 3 A shorted capacitor will show continuous continuity 4 An open capacitor will show constant 9 Due to internal resistor 5 Resistance between each terminal and chassis should be infinite 04 032M 8 3 Diode 1 Isolate the diode assembly from the circuit by disconnecting the leads 2 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 A meter with 9V
38. put Temperature readings and 20 SECONDARY LATCH SWITCH SHORT SWITCH PRIMARY LATCH SWITCH 08 199M NE C1275 1475 TABLE 1 litre 1min test RATED OUTPUT TEMPERATURE RISE 1100W IEC 705 Min 9 4 1300W IEC 705 Min 11 1 C Please confirm that the gap between the switch housing and switch actuator levers is no more than 0 5mm when the door is closed 10 TROUBLESHOOTING GUIDE 1 Check grounding before checking for trouble 2 Be careful of the high voltage circuit 3 Discharge high voltage capacitor CAUTION 4 When checking the continuity of the switches 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 damage to your meter 5 Do not touch any parts of the circuitry on the digital programmer 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 in your body 6 A 230 240V AC is present at the shaded area of the digital programmer circuit Terminals of power relays and switching power supply circuit When troubleshooting be cautious of possible electrical shock hazard First of all operate the microwave oven following the correct operating procedures described in order to find the exact cause of any trouble 21 1275 1475 TROUBL
39. temperature is higher than 12 96 021M predetermind temperature fan motor rotates for 5 minutes at maximum time to cool the electric components and oven UPPER HEATER OUT SIDE RY 8 UPPER HEATER IN SIDE RY 7 Grill Cooking Category 1 NE C1275 NE C1475 SELECTED OVEN TEMP OVEN TEMPERATURE UPPER HEATER IN SIDE RY 7 UPPER HEATER OUT SIDE RY 8 FAN MOTOR RY 10 CIRCULATION MOTOR RY 11 5 4 Combination cooking control Combination cooking is accomplished by operating the microwave heater mode alternately during combination cooking cycle There are 2 combination mode 1 Grill combination Grill Microwave 2 Convection combination Convection Microwave 1 The digital programmer circuit generates the power relays control signals at a specific timing as shown in figure 2 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 13 100 022M power relay 1 3 contol signal so that microwave activity continue at predetermined duty ratio as shown in figure The microwave activity continue to cycle until entire cooking programme is completed 3 When the oven temperature drops below the selected temperature the digital programmer circuit generates power relays contol signals
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