NN-SD686S NN-ST676M NN-ST666W NN
Contents
1. GROUNDING NE HIGH VOLTAGE PLATE upe sherds BRACKET INVERTER HIGH VOLTAGE DIODES SECONDARY WINDINGS HIGH VOLTAGE CHARGE REMAINS IN HIGH VOLTAGE CAPACITORS NN SD686S NN ST676M NN ST666W NN ST656W CONTENTS Page 1 SCHEMATIC DIAGRAM 5 2 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 6 2 1 Check the grounding gt 2 2 2 22 6 2 2 Inverter WarniNgS 6 2 3 Part replacement 2 7 2 4 When the 10A fuse is blown due to the operation of the short switch 7 2 5 Avoid inserting nails wire etc through any holes in the unit during operation 7 2 6 Confirm after 7 2 7 Sharp edges 3 MEASUREMENTS AND ADJUSTMENTS 8 3 1 Adjustment of primary latch switch secondary latch switch and short switch 8 Page 3 2 Measurement of microwave output 8 4 EXPLODED VIEW AND PARTS LIST 4 1 EXPLODED VIEW 4 2 PARTS LIST en 10 4 3 DOOR ASSEM2. PRIMARY LATCH SWITCH 5940 sode 99995959020 9 099 99520909 99220959 92090909 958020902 So o 95 990 999 90 o e a 5 2 9 9 DOOR HOOK ASSY SHORT SWITCH SECONDARY LATCH SWITCH SCREW 01 033 NN SD686S NN ST676M NN ST666W NN ST656W 4 VIEW AND PARTS LIST 4 1 EXPLODED VIEW S 7 000 a EXPLODED VIEW NN SD686S NN ST676M NN ST666W NN ST656W 4 2 PARTS LIST 1 When ordering replacement part s please use part number s shown in this part list Do not use description of the part 2 Important safety notice Components identified by mark have special characteristics important for safety When replacing any of these components use only manufacture s specified parts NOTE A parts are supplied by CSD Japan F parts are supplied by PHAMOS China Part No Part Name amp Description Pcs Set Remarks F00066V00HP CAUTION LABEL 1 F21555500AP OVEN STICKY PAPER F10014T00APG BASE F10084T00AP RUBBER FOOT F110D5Y00SAP CABINET BODY 0 SD686S F110D5Y60SAP CABINET BODY 0 ST676M F110D5Y30HAP CABINET BODY 0 ST66
3. 2 4 When the 10A fuse is blown due to the operation of the short switch WARNING When the 10A 250V fuse is blown due to the operation of the interlock monitor switch replace all of the components primary latch switch door switch short switch and power relay B RY1 1 This is mandatory Refer to adjustments and measurements for the location of these switches 2 When replacing the fuse confirm that it has the appropriate rating for these models 3 When replacing faulty switches be sure the mounting tabs are not bent broken or deficient in their ability to hold the switches 2 5 Avoid inserting nails wire etc through any holes in the unit during operation Never insert a wire nail or any other metal object through the lamp holes on the cavity or any holes or gaps because such objects may work as an antenna and cause microwave leakage 2 6 Confirm after repair 1 After repair or replacement of parts make sure that the screws of the oven etc are neither loose nor missing Microwaves might leak if screws are not properly tightened 2 Make sure that all electrical connections are tight before inserting the plug into the wall outlet 3 Check for microwave energy leakage Refer to procedure for measuring microwave energy leakage CAUTION MICROWAVE RADIATION USE CAUTION NOT TO BECOME EXPOSED TO RADIATION FROM THE MICROWAVE MAGNETRON OR OTHER PARTS CONDUCTING MICROWAVE ENERGY IMPORTANT NOTICE The foll
4. NN ST676M ST666W ST656W MN101C58 A 1 CN20 SWO15_EX 5 110 AETPSLOOGP m i 178 s uJ IC NAST P27 0340 104 01 D25 510VEX D26 230 240V 50Hz 011 ERA4502 4 ci VLCIN3 VLC3 VLCIN2 VLC2 Super Inverter iD Z 0330 EV 409 01 O to 440 R441 ct 470 1 Thermistor 440 AKC OV DOOR 34 L CLOSE THI bye o F228 100K C4 BJP20 TRGO V 1 0 AYA RS 25 18 5 E P54 0223 DTC123JKA 17 NN SD686S NN ST676M NN ST666W NN ST656W x 5 O SBIOA POL A O mim be x 24 SEJO i 26 4 I paced eaMP enki ine 7A play ee PAD Nn Na TNL SHH a w4 BIO SAU AE N AF LSTART RESETI 34 32 D41 1 0 1 5 D40 15S133T 77 13 49 11 510 COM2 COM4 COMO 59 58 57 56 55 54 53 52 51 AVI 10 10 pise SML2 10MT 0180 Ay 1
5. 20 CHIP CAPACITOR 1 0 01uF 50V ST676M ST666W C343 F1H1H1010005 CHIP CAPACITOR 1 100PF 50V 12 340 F1H1E104A030 CHIP CAPACITOR 2 0 1uF 25V C481 F1H1H473A220 CHIP CAPACITOR 1 0 047uF 50V ST676M ST666W C330 F1H1H102A219 CHIP CAPACITOR 1 1000PF 50V c10 AECETK1V561B AL CHEM CAPACITOR 1 560uF 35V C482 AECETS1H010B AL CHEM CAPACITOR 1uF 50V ST676M ST666W C483 AECETS1HR47B AL CHEM CAPACITOR 1 0 47uF 50V ST676M ST666W C485 AECETS1H2R2B AL CHEM CAPACITOR 1 2 2uF 50V ST676M ST666W CNI K1KA03AA0115 CONNECTOR 1 CN2 K1KA03A00300 CONNECTOR 1 3 Pin ST676M ST666W CN3 F03524U00AP INV HARNESS U 1 3 Pin CN4 F03535G40XN HARNESS U CN6 K1MN09AA0040 CONNECTOR 1 9 Pin CX320 EFOEC8004A4 CERAMIC RESONATOR 1 8 0 2 DISP110 L5AAAEC00060 LCD 1 DISP1 HOLDER F66174U20AP LCD HOLDER 1 D10 D13 BOEAKT000025 DIODE 4 D40 D220 D221 D223 BOAACK000004 DIODE 4 D25 D4EAY511A036 VARISTOR 1 510V D26 D27 D4EAY112A036 VARISTOR 2 1100 D180 D183 B3ACB0000065 CHIP LED 4 MN101C589EX L S I 1 IC480 COABBA000230 Ic 1 ST676M ST666W 0181 0220 0225 2SD0601A0L CHIP TRANSISTOR 3 Q226 UNR211100L CHIP DIGI TRANSISTOR 0182 0223 0224 B1GBCFEL0002 CHIP DIGI TRANSISTOR 3 010 0180 B1BAAJ000003 TRANSISTOR 2 R226 D0GB103JA072 CHIP RESISTOR 1 10K 1 10W 5 R490 R492 D0GB103JA072 CHIP RESISTOR 2 10K 1 10W 5 ST676M ST666W R221 R228 R342 R343 C40 C48 D0GB104JA068 CHIP RESISTOR 13 100K 1 10W 5 R483 R484 R489 DOGB105JA071 CHIP RESISTOR 3 1MQ 1 10W 5 ST676M ST666W R485
6. 4 2501859 9 meu C d Gg Backlight UPRA 2 JPR4 o JPRSMM te JPRSMM te Ie JPEEMM P C B JPRS JPR2 UPRA SENSOR 603 8 700 OPEN OPEN SHORT OPEN USE 3 OPEN OPEN OPEN SHORT USE F6O3L8FS90GP OPEN OPEN OPEN 18 9 9 5 3 1 PARTS LIST NN SD686S Part No Part Name amp Description Pcs Set NN SD686S NN ST676M NN ST666W NN ST656W LODDEA000014 BUZZER 2 0 2 1 1 1010005 CHIP CAPACITOR 100PF 50V C40 C48 C330 C331 F1H1H102A219 CHIP CAPACITOR 1000PF 50V C80 C81 C222 C228 C484 C486 F1H1H103A220 CHIP CAPACITOR 0 01pF 50V 481 F1H1H473A220 CHIP CAPACITOR 0 047 50 15 223 350 F1H1E104A030 CHIP CAPACITOR 0 1uF 25V C220 C221 F1H1A105A019 CHIP CAPACITOR 1pF 50V AECETK1V561B AL CHEM CAPACITOR 560uF 35V AECETS1C220B AL CHEM CAPACITOR 22uF 16V AECETS1H010B AL CHEM CAPACITOR 1pF 50V AECETS1HR47B AL CHEM CAPACITOR 0 47pF 50V AECETS1H2R2B AL CHEM CAPACITOR 2 2 5 K1KA03AA0115 CONNECTOR K1KA03A00300 CONNECTOR 3 Pin F03526P40AG INV HARNESS U K1KA04AA0086 CONNECTOR 4 Pin K1MN17A00001 CONNECTOR 17Pin K1MN17B00053 CONNECTOR 17Pin KIMNO9B
7. 5 DIGITAL PROGRAMMER CIRCUIT 5 1 NN SD686S BOARD D No F65557A10AP ECN17 8 1 2 i 5 85 a sa i C481 473 04 C483 0 47_50V INVERTER P C B PS2501 1K 8 955159 FL N Thermistor CLOSE CHI RY1 Main Fan RY2 Lamp RY3 Grill Heater 8025 22K 15 2 KC 3 10K C1 104 Ci 1 98 1 2224 ECN20 3 ECN20 3 1 48 ANY 80 A 103 017 aig 4 mo 9 69 Voltage ADJ 40kohm VA g 15 NN SD686S NN ST676M NN ST666W NN ST656W olasi ut Ne JPROMM 1951337 77 015 110 LCDSE4 OP USE 00490 8 DiB4 0189 1 115 IQ UPPO IGLUPAJ igh gl Bees ms 33 04 2SC2412K 9182 16 smr oren o vee NN SD686S NN ST676M NN ST666W NN ST656W 5 2
8. 6W ST656W F200A8F00AP OVEN 0 SD686S ST676M ST666W F200A8F40AP OVEN U ST656W F20555L00AP COVER F21315Y00AP PULLY SHAFT F2177 F80 WASHER 29009330 ROLLER RING U F30206G30AP DOOR HOOK F31366G30AP HOOK LEVER A F31376G30AP HOOK LEVER B F31386G30AP HOOK LEVER C F400A6V00OP FAN MOTOR AC240V SINGLE PHASE 50Hz 40084 00 BLADE F40257D00APG AIR GUIDE A 41444 00 ORIFICE 70754 00 STEAM SENSOR SD686S ST676M ST666W F64508660AP SENSOR COVER B SD686S ST676M ST666W 65434 00 SENSOR COVER SD686S ST676M ST666W F612E8F600P INCANDESCENT LAMP U J61415G10XN MICRO SWITCH PRIMARY LATCH SWITCH V 15G 3C25 J61414T00AP MICRO SWITCH SECONDARY LATCH SWITCH D3V 16G 3C25 F61455L00CP THERMAL CUTOUT 10556 F66264T00CP THERMAL CUTOUT INSULATION BRACKET F61785U30XN MICRO SWITCH SHORT SWITCH D3V 1G 2C25 F606Y4V00XN H V INVERTER U 2M261 M32J3Y MAGNETRON PPIP 62306 60 FUSE 10A 240V 50Hz F40264T60APG AIR GUIDE B F61844T00AP GROUNDING PLATE F63265U30XN TURNTABLE MOTOR F900C96600P AC CORD W PLUG F692Y8A00QP NOISE FILTER U XTWFA4 12T SCREW FOR MAGNETRON XTT
9. 86S F800L8F60SQP ESCUTCHEON BASE U SD686S F66167D00AP FLAT CABLE SD686S F80725Y00SAP DOOR OPENING BUTTON SD686S F82565Y00AP DOOR OPENING LEVER SD686S 80375 00 COOK BUTTON SPRING F630Y8F60SQP MEMBRANE SWITCH U F90095X00AP GROUNDING PANEL F803G7D00BAP POP UP DIAL U F80187D00BAP BACKSTOP F00078F60SQP NAME PLATE sp686s SD686S SD686S SD686S SD686S 12 NN SD686S NN ST676M NN ST666W NN ST656W 4 5 2 NN ST676M ST666W ST656W Part Part Name amp Description F603L8F70QP D P CIRCUIT AU ST676M F603L8F80QP D P CIRCUIT AU F603L8F90QP D P CIRCUIT AU F630Y8F70BQP MEMBRANE SWITCH U F630Y8F80BQP MEMBRANE SWITCH U F630Y8F90BQP MEMBRANE SWITCH U F80348F70SQP ESCUTCHEON BASE F80348F70HQP ESCUTCHEON BASE F80728F70SQP DOOR OPENING BUTTON F80728F70HQP DOOR OPENING BUTTON F80375K00AP COOK BUTTON SPRING F82566K10AP DOOR OPENING LEVEL F00078F70SQP NAME PLATE F00078F80HQP NAME PLATE F00078F90HQP NAME PLATE ST666W ST656W ST676M ST666W ST656W ST676M ST666W ST656W ST676M ST666W ST656W ST676M ST666W ST656W ST676M ST666W ST656W 13 NN SD686S NN ST676M NN ST666W NN ST656W 4 6 P
10. A0072 CONNECTOR F03547B40AP CONNECTOR 3 Pin CX320 EFOEC8004A4 CERAMIC RESONATOR 8MHz MN101C54CGZ L S I IC480 COABBA000230 Ic DISP110 L5AAAFD00019 LCD DISPL1 F66175E40XN LCD HOLDER F67525E40XN DIFFUSION SHEET 0181 0220 0225 2SD0601A0L CHIP TRANSISTOR 2SB709A0L CHIP TRANSISTOR UNR211100L CHIP DIGI TRANSISTOR Q182 Q210 Q223 B1GBCFEL0002 CHIP DIGI TRANSISTOR Q10 Q180 B1BAAJ000003 TRANSISTOR D180 D189 B3ACB0000065 CHIP LED D40 D220 D223 D227 BOAACK000004 DIODE D10 D11 D12 D13 0 000025 DIODE D25 D4EAY511A036 VARISTOR 510V D26 D27 D4EAY112A036 VARISTOR R182 R183 DOGB101JA069 CHIP RESISTOR 100Q 1 10W 5 R82 R83 R442 DOGB102JA071 CHIP RESISTOR 1KQ 1 10W 5 R80 R81 R223 R225 R490 R492 DOGB103JA072 CHIP RESISTOR 10KQ 1 10W 5 R13 R221 R228 R230 R352 R353 DOGB104JA068 CHIP RESISTOR 100KQ 1 10W 5 R483 R484 R489 DOGB105JA071 CHIP RESISTOR 1 1 10 5 R485 DOGB154JA068 CHIP RESISTOR 150KQ 1 10W 5 R488 R491 DOGB202JA071 CHIP RESISTOR 2KO 1 10W 5 R181 R320 DOGB220JA072 CHIP RESISTOR 220 1 10W 5 R220 R224 R226 R229 DOGB222JA072 CHIP RESISTOR 2 2KQ 1 10W 5 R210 DOGB332JA072 CHIP RESISTOR 3 3KQ 1 10W 5 R330
11. BLY ee 11 4 4 WIRING MATERIALS 11 4 5 ESCUTCHEON BASE ASSEMBLY 12 4 6 PACKING AND ACCESSORIES 14 4 7 H V INVERTER BOARD MAIN PARTS LIST 606 4 00 5 DIGITAL PROGRAMMER CIRCUIT 5 1 NN SD686S 5 2 NN ST676M ST666W ST656W 17 5 3 PARTS LIST SESA GRA ER 19 1 SCHEMATIC DIAGRAM NOTE Door is closed Unit is not operating Ground zr Chassis NN SD686S NN ST676M NN ST666W NN ST656W AUTION HIGH VOLTAGE AREA POWER RELAY B RY1 MAGNETRON a l 1 s 4 THERMAL i G i CUTOUT 1 PRIMARY I O NOISE FILTER U je i gt REJA JE I CN702 CN703 s I oj IR h 230 240V A 1 1 N 1 1 EEG Imela i FUSE INVERTER J INVERTER KOM
12. DOGB154JA068 CHIP RESISTOR 1 150KQ 1 10W 5 ST676M ST666W R488 R491 DOGB202JA071 CHIP RESISTOR 2 2KQ 1 10W 5 ST676M ST666W R320 DOGB220JA072 CHIP RESISTOR 1 220 1 10W 5 R220 R222 R223 DOGB222JA072 CHIP RESISTOR 3 2 2K 1 10W 5 R310 DOGB332JA072 CHIP RESISTOR 1 3 3K 1 10W 5 R330 D0GB333JA070 CHIP RESISTOR 1 33K 1 10W 5 R181 D0GB360JA072 CHIP RESISTOR 1 360 1 10W 5 R331 R441 DOGB471JA069 CHIP RESISTOR 2 4700 1 10W 5 R360 DOGB472JA072 CHIP RESISTOR 1 4 7K 1 10W 5 R480 R481 DOGB472JA072 CHIP RESISTOR 2 4 7K 1 10W 5 ST676M ST666W R487 DOGB433JA072 CHIP RESISTOR 1 43KQ 1 10W 5 R440 C440 DOGB512JA072 CHIP RESISTOR 2 5 1KQ 1 10W 5 R486 DOGB684JA068 CHIP RESISTOR 1 680KQ 1 10W 5 ST676M ST666W R10 R11 R311 DOAE102JA155 CARBON RESISTOR 3 1K 1 4W 5 R12 R180 DOAE103JA155 CARBON RESISTOR 2 10K 1 4W 5 R290 DOAE104JA155 CARBON RESISTOR 1 100K 1 4W 5 1 AEBGJOC25F18 POWER RELAY 1 18V RY2 K6B1AZA00011 POWER RELAY 1 18 T10 G4C3AAH00008 LOW VOLTAGE TRANSFORMER ab ZD10 BOBA5R600016 ZENER DIODE 1 05 06 S 8F6 S 8F7 S 8F8 S 8F9 Printed in China
13. FA4 6BN SCREW FOR COVER XTCAFA4 12AFM SCREW FOR CABINET BODY SIDE SD686S XTCAFA4 12AFS SCREW FOR CABINET BODY SIDE ST676M XTCAFA4 12AFW SCREW FOR CABINET BODY SIDE ST666W ST656W XTWFA4 12D SCREW FOR CABINET BODY F02445Y00AP CAUTION LABEL sp686s F03348F60QP MENU LABEL 10 sp686s 4 3 DOOR ASSEMBLY Part No Part Name amp Description NN SD686S NN ST676M NN ST666W NN ST656W Pcs Set Remarks F3018 1200 DOOR KEY 1 F301A8F70SQP DOOR ST676M F301A8F70HQP DOOR ST666W ST656W F302K5L00AP DOOR E U F30215G10XN DOOR KEY SPRING F30854T00AP DOOR C F31456V60XP DOOR SCREEN F31468F70BQP DOOR SCREEN B ST676M ST666W ST656W F01726V00JP CAUTION LABEL B F301A8F60SQP DOOR U 4 4 WIRING MATERIALS Part No CAUTION HEAT SINK HOT LIVE VERY HIGH VOLTAGE A SD686S MAGNETRON ND TEMPERATURE Part Name amp Description Pcs Set FO30A8A00QP LEAD WIRE HARNESS 1 FO30E8A00QP H V LEAD WIRE 1 11 NN SD686S NN ST676M NN ST666W NN ST656W 4 5 ESCUTCHEON BASE ASSEMBLY 4 5 1 NN SD686S E15 E6 Part No Part Name amp Description F603L8F60QP D P CIRCUIT AU 1 SD686S F603Y8F600P D P CIRCUIT DU SD6
14. OMO m 1 poweR INV PCB RELAY Bl i HBE RY1 VARISTOR ma m i POWER 4 RELAY RY2 DIGITAL PROGRAMMER CIRCUIT O MAC STEAM SENSOR EXCEPT FOR NN ST656W WIRING DIAGRAM W NOTE When replacing check the lead wire color as shown O Colors shown by indicate colors of lead wire V 15G 3C25 w connector housing Ne NEW PRIMARY GR LATCH SWITCH GR TOP BR CAUTION H V MAGNETRON GR SYMBOL COLOR OR ORANGE BL BLUE ne R Y YELLOW R RED SECONDARY SHORT de GR SBA LATCH SWITCH LATCH SWITCH vUV N NATURAL BOTTOM OUTSIDE BOTTOM INSIDE R G GREEN S 6F6 N S 6F7 B B BL BL 5 S 6F9 1 2 HIGH VOLTAGE INVERTER NN SD686S NN ST676M NN ST666W NN ST656W 2 CAUTIONS BE OBSERVED WHEN TROUBLESHOOTING Unlike many other appliances the microwave oven is a high voltage high current device It is free from danger in ordinary use though extreme care should be taken during repair Caution Servicemen should remove their watches whenever working close to or replacing the magnetron 2 1 Check the grounding Do not operate on a two wire extension cord The microwave oven is designed to be grounded when used It is imperative therefore to ensure the appliance is properly grounded before beginning repa
15. ORDER NO PHAMOS0605028A3 Service Manual Microwave Oven NN SD686S NN ST676M NN ST666W NN ST656W QPQ Australia amp New Zealand Please file and use this manual together with the service manual for Model NN S560WF ORDER NO SIMMC0006012C3 Specifications Output ow nw now 518mm W X 404mm D X301mm H 375mm W X 386mm D X 225mm H PbF Specifications subject to change without notice 2006 Panasonic Home Appliances Microwave Oven Shanghai Ltd All rights reserved anasonic Unauthorized copying and distribution is a violation of law NN SD686S NN ST676M NN ST666W NN ST656W ZA 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 1 This product should be serviced only by trained gualified personnel 2 Check for radiation leakage before and after every servicing according to the procedure for measuring radiation leakage 3 If the unit cannot be repa
16. R441 C441 DOGB333JA070 CHIP RESISTOR 33KQ 1 10W 5 DOGB363JA072 CHIP RESISTOR 36K 1 10W 5 DOGB433JA072 CHIP RESISTOR 43KQ 1 10W 5 R227 R331 R493 0 47174069 RESISTOR 4700 1 10 5 R360 R480 R481 DOGB472JA072 CHIP RESISTOR 4 7KQ 1 10W 5 R486 DOGB684JA068 CHIP RESISTOR 680KQ 1 10W 5 R11 R16 R211 DOAE102JA155 CARBON FILM RESISTOR 1 0 1 4 5 DOAE103JA155 CARBON FILM RESISTOR 10KQ 1 4W 5 DOAE104JA155 CARBON FILM RESISTOR 100KQ 1 4W 5 BOBA5R600016 ZENER DIODE AEBGJOC25F18 POWER RELAY K6B1AZA00011 POWER RELAY G4C3AAH00008 LOW VOLTAGE TRANSFORMER EVEJ1HF2224B REVOLVING ENCODER 19 NN SD686S NN ST676M NN ST666W NN ST656W 5 3 2 NN ST676M ST666W ST656W 20 Ref No Part No Part Name amp Description Pcs Set Remarks BZ310 LODDEA000014 BUZZER ak 2 0KHz C221 F1H1H103A220 CHIP CAPACITOR 1 0 01pF 50V C484 F1H1H103A2
17. art Part Name amp Description PACKING AND ACCESSORIES ROLLER RING ASSY Cut into two parts when packing Pcs Set 00038 600 INSTRUCTION MANUAL 1 8556868 F00038F70QP INSTRUCTION MANUAL ST676M ST666W ST656W F01028F60SQP PACKING CASE PAPER SD686S F01028F70SQP PACKING CASE PAPER ST676M F01028F80HQP PACKING CASE PAPER ST666W 01028 90 CASE PAPER ST656W 01046 50 UPPER FILLER F01055L00AP LOWER FILLER F01067F00AP P E BAG SD686S F01068100XN P E BAG ST676M ST666W ST656W F01078100XN DOOR SHEET 00166 200 506865 06014 00 01924 00 SHEET ST676M 4 7 F00065G40AP CAUTION LABEL Part No H V INVERTER BOARD MAIN PARTS LIST F606Y4V00XN Part Name amp Description Pcs Set A691E4V10GP TRANSISTOR SI 1 TRANSISTOR SI AESTRS2006M DIODE SI 20A 600V D701 D702 A62024V00GP DIODE SI 0 3A C704 C705 ECWH30822JUA CAPACITOR 8200PF 3000VDC F609A4V00XN H V TRANSFORMER F607D4V00XN D P CIRCUIT KU F50204V00XN CHOKE COIL F66904V00XN CURRENT TRANSFORMER 14 NN SD686S NN ST676M NN ST666W NN ST656W
18. eme DANGER Be sure that the inverter circuit is properly grounded via the inverter earth bracket Grounding of the inverter circuit board WARNING DISCHARGE THE HIGH VOLATGE CAPACITORS For about 30 seconds after the oven is turned off an electric charge remains in the high voltage capacitors in the inverter power supply circuit board When replacing or checking parts remove the power plug from the outlet and short the inverter output terminal of the magnetron filament terminals to the chassis ground with an insulated handle screwdriver to discharge Please be sure to touch the chassis ground side first and then short to the output terminals MAGNETRON FILAMENT TERMINAL INSULATED HANDLE SCREWDRIVER Touch chassis side first then short to the terminal of the magnetron filament terminal Discharging the high voltage capacitors WARNING There is high voltage present with high current capabilities in the circuits of the primary and secondary windings choke coil and heat sink of the inverter 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 the filament voltage of the magnetron WARNING Never touch any circuit wiring with your hand or with an insulated tool during operation 2 3 Part replacement When any part or component is to be replaced always ensure that the power cord is removed from the wall outlet
19. ir work 2 2 Inverter warnings DANGER HIGH VOLTAGE AND HIGH TEMPERATURE HOT LINE OF THE INVERTER POWER SUPPLY U The high voltage inverter power supply handles very high voltage and current for the magnetron tube Though it is free from danger in ordinary use extreme care should be taken during repair The aluminum heat sink is also energized with high voltage HOT do not touch when the AC input terminals are energized The power device Collector is directly connected to the aluminum heat sink The aluminum heat sink may be HOT due to heat energy therefore extreme care should be taken during servicing DANGER OF HIGH VOLTAGE AND HIGH TEMPERATURE HEAT SINK HOT LIVE OF HEAT SINK RECTIFIER BRIDGE Z HIGH VOLTAGE TRANSFORMER CURRENT TRANSFORMER SAND BAR RESISTOR SHORT FOR DISCHARGING HIGH VOLTAGE CHARGE REMAINS IN HIGH VOLTAGE CAPACITORS HIGH VOLTAGE DIODES SECONDARY WINDINGS DO NOT TOUCH aan HIGH VOLTAGE CHARGE REMAINS IN HIGH VOLTAGE CAPACITORS H V Inverter warning WARNING FOR INVERTER POWER SUPPLY U GROUNDING Check the high voltage inverter power supply circuit grounding The high voltage inverter power supply circuit board must have a proper chassis ground The inverter grounding bracket must be connected to the chassis If the inverter board is not grounded it will expose the user to very high voltages and cause extr
20. ired on site advise the customer not to use until unit is repaired 4 There are special components used in the microwave oven which are important for safety These parts are marked with a Z on the replacement parts list It is essential that these critical parts be replaced only with the manufacture s specified parts to prevent microwave leakage shock fire or other hazards Do not modify the orginal design This service manual covers products for following markets When troubleshooting or replacing parts please refer to the country identifications shown below for your applicable product specification For Australia amp New Zealand CAUTION About lead free solder PbF Distinction of PCB PCBs 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 30 40 C higher Please use a high temperature soldering iron In case of the soldering iron with temperature control please set it to 370 10 C e Pb free solder will tend to splash when heated too high about 600 C NN SD686S NN ST676M NN ST666W NN ST656W DANGER HIGH VOLTAGE AND HIGH TEMPERATURE OF THE INVERTER POWER SUPPLY U INVERTER WARNING This Inverter board looks like a regular PCB However this PCB drives the magnetron tube with extremely high voltage and high current HAS 1 Very high v
21. oltage and high current circuits It functions the same as the high voltage transformer and high voltage capacitor in ordinary microwave ovens Aluminum heat sink that is energized with very high voltage and high heat energy Very high voltage which may remain in circuitry even when oven is off High voltage charge may remain in the capacitors on the board Do not touch circuitry because it has very hot high voltage circuitry Even when replacing board extreme care should be taken to avoid possible electric shock hazards High voltage charge may remain in circuits Do not touch aluminum heat sink because it is energized with very high voltage and is also very hot in high heat energy Do not try to adjust or tamper with preset control on the Inverter board because it is very dangerous to adjust without proper test eguipment Do not test oven while Inverter grounding plate or screws are loose It is very dangerous to operate H V Inverter Circuit U with loose mounting screws or if improperly grounded Do not try to repair Inverter PCB because it is very dangerous to repair Replace as a complete High Voltage Inverter Circuit unit INVERTER POWER SUPPLY DANGER OF HIGH VOLTAGE AND HIGH TEMPERATURE HEAT SINK HOT LIVE OF HEAT SINK RECTIFIER BRIDGE HIGH VOLTAGE INVERTER U TRANSFORMER CHOKE COIL CURRENT TRANSFORMER v SAND BAR SHORT FOR RESISTOR DISCHARGING HIGH VOLTAGE CHARGE REMAINS IN
22. owing components have potentials above 2000V while the appliance is operated e Magnetron e High voltage transformer Located on inverter U e High voltage diodes Located on inverter U e High voltage capacitors Located on inverter U Pay special attention to these areas When the appliance is operated with the door hinges or magnetron installed incorrectly the microwave leakage can exceed more than 5mW cm After repair or exchange it is very important to check if the magnetron and the door hinges are correctly installed NN SD686S NN ST676M NN ST666W NN ST656W 2 7 Caution Sharp edges Please use caution when unpacking installing or moving the unit as some exposed edges may be sharp to the touch and cause injury if not handled with care NN SD686S NN ST676M NN ST666W NN ST656W 3 MEASUREMENTS AND ADJUSTMENTS 3 1 Adjustment of primary latch switch secondary latch switch and short switch 1 Mount the Primary latch switch the secondary latch switch and the short switch to the door hook assembly as shown in ILL NOTE No specific required individual adjustments during installation of the Primary latch switch Secondary latch switch or Short switch to the door hook are 3 2 Measurement of microwave output The output power of the magnetron can be determined by performing IEC standard test procedures However due to the complexity of IEC test procedures i
23. t is recommended to test the magnetron using the simple method outlined below Necessary Equipment 1 liter beaker Glass thermometer Wrist watch or stopwatch NOTE Check the line voltage under load Low voltage will lower the magnetron output Take the temperature 2 When mounting the door hook assembly to the oven assembly adjust the door hook assembly by moving it in the direction of the arrows in the illustration 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 readings and heating time as accurately as possible 1 Fill the beaker with exactly one liter of tap water Stir the water using the thermometer and record the waters temperature recorded as T1 Completely tighten the screws holding the door hook assembly to the oven assembly 3 Reconnect the short switch and check the continuity of the monitor circuit and all latch switches again by following the component test procedures 2 Place the beaker on the center of glass tray Set the oven for High power and heat it for exactly one minute 3 Stir the water again and read the temperature of the water recorded as T2 4 The normal temperature rise at High power level for each model is as shown in table TABLE 1L 1min test RATED OUTPUT TEMPERATURE RISE 1100W Min 9 4 C ACTUATOR LEVER DOOR SCREW
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