Panasonic NN-A860WB Service Manual Download Page 59

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How to check semiconductors

18. Exploded View

19. Main Parts List

1. Part numbers are indicated on most mechanical parts. Please use

these part numbers for part orders. Do not use the description of
the part.

Important safety notice

1. Components identified by mark have special characteristics

important for safety. When replacing any of these components,

Summary of Contents for NN-A860WB

Page 1: ...Order Number MOP00100021C2 Microwave Oven NN A890WB NN A860WB SPG Scandinavian Countries WPG Switzerland SPECIFICATIONS 1 ...

Page 2: ...2 ...

Page 4: ... shock High voltages may remain in the circuit 2 Do not touch the aluminium heat sink as it will become very hot It also contains high voltages 3 Do not attempt to repair the inverter PCB as this can be very dangerous Replace the high voltage inverter circuit as a complete unit Return the old unit fully repacked in the original shipping box and completed paper work 4 Do not adjust or tamper with t...

Page 5: ...Inverter Gounding Figure 2 Inverter PCB layout 2 Feature Chart 5 ...

Page 6: ...Defrost 2 2 Weight Combination 6 6 Weight Reheat 2 Weight Cook 6 Memory Cook 1 1 Weight Crisp 2 Stage Cooking 3 3 Delay Stand YES YES More Less YES NO Clock 24H 24H Function NN A890WB SPG WPG NN A860WB SPG WPG Word Prompt Step by Step LED NONE None Danish English 3 Control Panel 4 Operation And Digital Programmer Circuit Test Procedure 4 1 Word Prompting 4 2 Setting the Clock 6 ...

Page 7: ...4 3 Microwave Cooking 4 4 Auto Weight Defrost 4 5 Delay Stand 7 ...

Page 8: ...4 6 Delay Start 4 7 Child Lock 4 8 Grill Operation 4 9 Convection Operation 8 ...

Page 9: ...4 10 Turbo Bake Operation 4 11 Combination Cooking Convection and Microwave 4 12 Combination Cooking Grill and Microwave 9 ...

Page 10: ...4 13 Combination Cooking Turbo Bake and Microwave 4 14 Memory 10 ...

Page 11: ...4 15 Auto Weight Cook Programs NN A860WB 4 16 Auto Weight Cook Program NN A890WB 4 17 Auto Sensor and Sensor Combi Programs NN A890WB 5 Schematic Diagram 11 ...

Page 12: ... with the percentage of microwave power since approximately 2 seconds are required for heating the magnetron filament NOTE 2 If microwave cooking is over 8 minutes on HIGH power the fan motor rotates for 1 minute after cooking to cool the oven and electrical components Duty cycles for microwave cooking Output Duty ON OFF ON time OFF time High 1000W 22 0 Defrost 440W 16 6 Medium 600W 22 0 Low 440W ...

Page 13: ...play window has elapsed the oven turns off automatically via the control signal from the digital programmer circuit Note After auto cooking if the oven temperature is over the predetermined temperature the fan motor rotates to cool the oven and its components Auto Weight Defrost NN A890WB Category 1st Touch Weight Cooking Time 1 Reheat 300 4m 2 Frozen Reheat 300 8m Auto weight Cook NN A890WB Categ...

Page 14: ...igital programmer circuit operates the power relays RY3 RY5 and RY6 in the sequence as shown in the figure below 2 When the oven reaches a predetermined temperature the digital programmer circuit stops supplying power to relay RY5 resulting in the convection heater turning off 3 When the temperature drops below the predetermined temperature the digital programmer circuit supplies power to power re...

Page 15: ...erate relay RY1 so that microwave activity continues at the duty cycle selected The inverter control signal level is also maintained The microwave activity continues to cycle until the entire cooking program is completed When the oven temperature drops below the selected temperature the digital programmer circuit operates power relay RY5 switching on the heater elements In the case of grill combin...

Page 16: ...6 38 250W 360W 48 18 100W 360W 21 45 Grill Convection And Microwave Combination Duty Cycles Convection Heater Grill Heater Micropower 100 250 C ON OFF OUTPUTON OFF Grill 1 51 15 Grill 2 42 24 440W 360W 66 0 Grill 3 28 38 250W 360W 48 18 100W 360W 21 45 Figure 1 Convection and microwave duty cycles Figure 2 Grill and microwave duty cycles 16 ...

Page 17: ...gth of time it will take to cook the food NOTE Auto sensor cooking is successful with the foods and recipes found in the auto sensor cooking guide Because of the vast differences in food composition items not mentioned in the cooking guide should be prepared in the microwave oven using the power select and time features Please consult variable power microwave cook book for procedures Explanation o...

Page 18: ...e Example 1 If the t1 time is measured to be 2 minutes and 40 seconds and the auto sensor program is selected is sensor reheat Fish Program 6 T2 T1 x K 2 min and 40 sec X 0 3 48 sec Category P1 POWER P2 POWER K FACTOR STANDARD 1 Frozen reheat HIGH HIGH 0 3 2 Reheat MED HIGH 0 4 Figure 1 Auto sensor cooking 8 Cautions to Be Observed When Troubleshooting Unlike many other appliances the microwave ov...

Page 19: ...minium heat sink is also energized with high voltage HOT so do not touch when the AC input terminal is connected The power devices Collector is directly connected to the aluminium heat sink The aluminium heat sink may be HOT due to heat energy therefore extreme care should be taken during servicing Figure 1 HV Inverter warning WARNING FOR INVERTER POWER SUPPLY U GROUNDING Check the high voltage in...

Page 20: ...nal 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 Figure 3 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 sin...

Page 21: ...s 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 8 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 a...

Page 22: ...ed with care 9 SÄKERHETSÅTGÄRDER VID FELSÖKNING Till skillnad från många andra apparater förekommer det hög strömstyrka och höga spänningar i mikrovågsugnar Ugnen är helt säker vid vanligt bruk men vid reparation måste största försiktighet iakttagas FÖRSIKTIGHET Vid reparation i närheten av magnetronen eller vid byte av magnetron skall armbandsur avtagas 9 1 Kontrollera jordningen Använd inte förl...

Page 23: ...kortkrets måste vara ordentlig jordad i ytterchassit genom jordningsfästet mot chassits jord I annat fall står högspänningsomvandlaren under mycket hög spänning och utgör LIVSFARA Säkerställ ordentlig jordning med jordningsplattan och skruvar Fig 2 VARNING URLADDA HÖGSPÄNNINGSKONDENSATORERNA Var uppmärksam på att det finns elektrisk laddning i högspänningskondensatorerna När ugnen har stängts av f...

Page 24: ...NG Vidrör aldrig några strömförande delar med handen eller med ett icke isolerat verktyg under arbetet 9 3 Vid byte av delar måste kontakten dras ur vägguttaget 9 4 Om 10A säkringen gått genom att kortslutningsbrytaren har utlösts VARNING Om 10A säkringen gått genom att kortslutningsbrytaren har utlösts måste både spärrbrytaren och kortslutningsbrytaren bytas Byt också strömreläet RY1 om kontinuit...

Page 25: ...a att ingen mikrovågsenergi läcker ut Se förfarandet för mätning av läckage av mikrovågsenergi FÖRSIKTIGHET MIKROVÅGSSTRÅLNING UTSÄTT DIG INTE FÖR STRÅLNING FRÅN MIKROVÅGSGENERATORN ELLER ANDRA DELAR SOM LEDER MIKROVÅGSENERGI VIKTIGT Följande komponenter har spänningar på över 250V medan ugnen är i bruk Magnetronen Högspänningstransformatorn på omvandlaren U Högspänningsdioderna på omvandlaren U H...

Page 26: ...U KORKEAJÄNNITETTÄ JA KORKEAA LÄMPÖTILAA KUUMA JÄNNITTEINEN KOSKEVA VAROITUS Tämän korkeajännitemuuntimen teholähdekortti käsittelee magnetroniputken erittäin korkeaa jännitettä ja suurta virtaa Vaikka se onkin täysin turvallinen normaalikäytössä sen korjauksessa on noudatettava ehdotonta varovaisuutta Kuten kuva osoittaa muunnin näyttää television paluujuovan muuntimelta mutta virta on hyvin suur...

Page 27: ...ondensaattorien sähkövaraus säilyy noin 30 sekunnin ajan Kun vaihdat tai tarkistat uunin osia irrota sähköpistoke pistorasiasta ja pura varaus oikosulkemalla magnetronin hehkunapojen muuntimen lähtönavat rungon maahan ruuviavaimella jossa on eristyskahva Kosketa ensin rungon maata ja oikosulje sitten lähtönavat Fig 3 VAROITUS Muuntimen ensiö ja toisiokäämien kuristuskelan ja jäähdytyslevyn virtapi...

Page 28: ...sta sen tehon sopivuus näihin malleihin 3 Kun vaihdat viallista kytkintä varmista etteivät kiinnityskielekkeet ole taipuneet rikkoutuneet tai ettei niiden kyky pitää kytkimiä paikallaan ole muuten puutteellinen 10 5 Laitteen aukkoihin ei saa työntää nauloja johtoja eikä muita esineitä käytön aikana Älä koskaan työnnä johtoa naulaa tai muuta metalliesinettä laitteen lampulle tarkoitettuihin tai mui...

Page 29: ...rat laitetta pakkauksesta tai kun asennat tai siirrät sitä Jotkin laitteen ulkoreunat ovat teräviä ja voivat aiheuttaa vahinkoja jos laitetta ei käsitellä huolellisesti 11 SIKKERHETSTILTAK VED FEILSØKING I motsetning til mange andre husholdningsapparater er mikrobølgeovnen et apparat med høy spenning og sterk strøm Selv om den er ufarlig i normalt bruk må du være ytterst forsiktig ved reparasjonsa...

Page 30: ...rekte koplet til kjølelegemet av aluminium Kjølelegemet av aluminium kan være VARMT på grunn av varmeenergi og derfor må det utvises ekstrem forsiktighet ved service og utskiftning Fig 1 ADVARSEL OM JORDING PÅ STRØMFORSYNINGEN TIL INVERTEREN U Kontroller jordingen på kretsen for høyspentforsyning til vekselretteren Dette høyspentforsynings kretskortet til vekselretteren må ha skikkelig apparatjord...

Page 31: ...terminalene til apparatjordingen med et skrujern med isolert håndtak Pass på at du berører apparatjordingssiden først og så kortslutter til utgangsklemmene Fig 3 ADVARSEL Det er høy spenning til stede med sterkstrøm i kretsene på primær og sekundærviklingene spolesperren og kjølelegemet i inverteren Det er ytterst farlig å arbeide med eller i nærheten av disse kretsene mens ovnen er strømførende D...

Page 32: ...nnom noen av hullene i apparatet mens det er i bruk Sett aldri tråd spiker eller noe annen metallgjenstand gjennom lampehullene i hulrommet eller andre huller eller åpninger fordi slike gjenstander kan virke som en antenne og forårsake lekkasje av mikrobølger 11 6 Bekreft etter reparasjon 1 Etter reparasjon eller utskiftning av deler skal du passe på at skruene på ovnen osv ikke er løse eller mang...

Page 33: ... ved normal brug skal reparation foretages med største forsigtighed FORSIGTIG Montører bør tage deres armbåndsur af når de skal arbejde i nærheden af magnetronen eller udskifte denne 12 1 Kontrol af jordforbindelse Tilslut ikke ovnen ved hjælp af en 2 leder forlængerledning Mikrobølgeovnen er konstrueret til at arbejde med jordforbindelse Se derfor efter at ovnen er forsvarligt forbundet til jord ...

Page 34: ...orbindelsen hvis ikke vil denne printplade udsende stor højspænding og udgøre ekstrem FARE Sørg for at der er korrekt jording ved jordpladen og skruerne Fig 2 ADVARSEL ANG AFLADNING AF HØJSPÆNDINGSKONDENSATORER Advarsel om elektrisk strøm i højspændingskondensatoren I ca 30 sekunder efter at der er slukket for ovnen vil der stadig være elektrisk strøm i højspændingskondensatorerne i vekselretteren...

Page 35: ...en eller et isoleret værktøj mens ovnen er i gang 12 3 Når der skal skiftes komponenter skal stikket tages ud af stikkontakten 12 4 Når 10 A sikringen smelter som følge af betjening af afbryderkontakten ADVARSEL Når den 10 A 250 V sikring smelter som følge af betjening af afbryderkontakten skal du skifte den primære låsekontakt og afbryderkontakten ud Du skal også skifte strømrelæ 1 RY1 ud når kon...

Page 36: ... sættes i stikkontakten 3 Check om der er lækage af mikrobølgeenergi Se proceduren for måling af lækager af mikrobølgeenergi FORSIGTIG MIKROBØLGESTRÅLER PAS PÅ IKKE AT BLIVE UDSAT FOR BESTRÅLING FRA MIKROBØLGEGENERATOREN ELLER ANDRE KOMPONENTER DER LEDER MIKROBØLGEENERGI VIGTIGT NY HØJSPÆNDING Følgende komponenter bærer højspænding over 250 volt under drift Magnetron Højspændingstransformer sidder...

Page 37: ...high voltage leads from the magnetron 4 Remove the four screws holding the magnetron as shown in figure 2 NOTE After replacing the magnetron tighten the mounting screws making sure that there is no gap between the waveguide and the magnetron to prevent microwave leakage Caution When replacing the magnetron ensure that the antenna gasket is in place Note The magnetron used for this model is unique ...

Page 38: ...ven chassis 6 Carefully remove the inverter PCB and support base from the oven 7 Remove the air guide E by un clipping the catch hooks 8 Remove the four screws holding the PCB to the inverter support base Caution when replacing the inverter power supply U 1 Make sure that grounding plate is in place 2 Securely tighten the grounding screw through the side of the chassis Base 3 Securely connect the ...

Page 39: ...t all connectors from the DPC 2 Remove the four screws holding the escutcheon base and slide the escutcheon base upward slightly removal is easier with the door open 3 Release the flat cable 4 Remove the six screws holding the DPC DU assembly 5 Remove the door lever 6 Remove the nine screws holding the DPC AU assembly To remove escutcheon pad 1 Remove the escutcheon bracket from the escutcheon bas...

Page 40: ... so that problems such as shorted contacts and uneven surfaces can be avoided Figure 5 Removal of DPC DU and DPC AU 13 4 Low voltage transformer and or power relays Note Be sure to ground your body to discharge any static before handling the DPC 1 Using a solder wick or a de soldering tool and a 30W soldering iron carefully remove all solder from the terminal pins of the low voltage transformer an...

Page 41: ... fan motor assembly 6 Detach the orifice assembly and the fan motor assembly from the oven assembly 7 Remove the fan blade from the fan motor by pulling outward Figure 6 Removing the fan motor 13 6 Door disassembly 1 Remove door C from door E by carefully pulling outward starting from the upper right hand corner using a flat blade screwdriver 2 Remove four screws holding the door E to the door A a...

Page 42: ...assembly is not mounted properly microwave power may leak from the clearance between the door and oven 3 Perform the microwave leakage test Figure 7 Disassembly of the door 13 7 Turntable Motor 1 Remove the motor cover by breaking off at the 8 spots indicated by the arrows 2 Disconnect the two lead wires connected to the turntable motor 3 Remove the turntable motor by removing the two screws Note ...

Page 43: ...10 3 Disconnect the cables to the grill heater 4 Remove the grill cover by removing the 5 screws in figure 11 5 Remove the two screws holding the grill heater Figure12 6 Loosen the 2 screws holding the ceramic grill holders turn the holders to release the grill element 7 Remove the heater bracket D by using a flat blade screw driver to lever back the tabs 8 The grill element can now be removed fro...

Page 44: ...ter Figure 12 Removing the grill element 13 9 Convection Element And Circulation Fan Motor 1 Remove one screw to remove the the exhaust guide D Figure 13 2 Remove the rear heater cover by removing the three screws Figure 13 3 Remove the temperature sensor by removing the two screws Figure 14 44 ...

Page 45: ... from the oven base Figure 15 7 Carefully place hte oven onto its base and remove the backplate 8 Remove the nut holding the circulation fan Figure 16 9 Remove the circulation fan by removing the three screws Figure 16 10 Remove the convection element by removing the two screws Figure 16 Figure 13 Removing the rear heater cover Figure 14 45 ...

Page 46: ...Removing the oven back plate Figure 15 Removing the base plate Figure 16 46 ...

Page 47: ...tempt to measure this high voltage 3 Before touching any oven components or wiring always unplug the oven from its power source and discharge the high voltage capacitors 14 1 Primary Latch Switch Secondary Latch Switch and power relay B interlocks 1 Unplug the lead connectors to power relay B and verify the continuity of the power relay B 1 2 terminals 2 Unplug the lead connectors to the primary l...

Page 48: ... terminals 2 Connect the test probes of the ohm meter to these leads 3 Test the continuity of the short switch with the door open and the door closed using the lowest ohm scale Door Open Door Closed Monitor switch 0 infinte 14 3 Magnetron Continuity checks can only indicate an open filament or a shorted magnetron To diagnose an open filament or shorted magnetron 1 Isolate the magnetron from the ci...

Page 49: ...matrix is shown on Key Board Matrix 14 5 Inverter Power Supply Caution DO NOT try to repair this inverter power supply Replace as a whole H V Inverter Unit Figure 3 Inveter power supply diagram 14 6 Inverter Power Supply Unit Warning Do not attempt to make any measurements in the high voltage circuitry of the inverter or magnetron 49 ...

Page 50: ...ss the sensor heater terminals Normal cold resistance should read approximately 4 5 ohms 2 Check the volatge across the sensor heater terminals It should read approximately 2 5VDC 3 In order to determine if the auto cooking by humidity sensor is working perform the following test 1 Place a water load 150cc in the oven 2 Press the auto reheat panel 3 Press the start pad 4 The humidty sensor detects...

Page 51: ...ten the screws holding the door hook assembly to the oven assembly 3 Reconnect the short switch primary switch and secondary latch switches and check the continuity of the monitor circuit and latch switches by following the component test procedures on page 15 2 Measurement of microwave output The output power of the magnetron can be determined by performing the IEC standard test However due to th...

Page 52: ...mal temperature rise at the high power position for each model is shown in the table Figure 2 Figure 1 Adjustment of latch switch assembly RATED OUTPUT TEMPERATURE RISE 1000W 8 C 16 Troubleshooting Guide Fuses are not blown 52 ...

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Page 54: ...Fuses are not blown 54 ...

Page 55: ...55 ...

Page 56: ...56 ...

Page 57: ...Other problems Inverter circuit troubleshooting Alternative method for toubleshooting the inverter circuit 17 Digital Programmer Troubleshooting Guide 57 ...

Page 58: ...58 ...

Page 59: ...bers are indicated on most mechanical parts Please use these part numbers for part orders Do not use the description of the part Important safety notice 1 Components identified by mark have special characteristics important for safety When replacing any of these components 59 ...

Page 60: ...236750BP CAM A 1 22 E61425180AP SHUTTER SWITCH 1 23 E22439000BP ADIABATIC MATERIAL A 1 24 E40474V00BP AIR GUIDE E 1 25 E09020000AK CUSHION RUBBER 1 26 E40309000GP AIR GUIDE D 1 27 E030E4V20BP HV LEAD WIRE 1 28 E606Y4V20GP INVERTER 1 29 E66014V00BP INVERTER EARTH BRACKET 1 30 E65854V00BP INVERTER SUPPORT BRACKET 1 31 E01214V20BP ADAPTOR PLATE 1 32 E610T6700BP OVEN LAMP 1 33 E31374830AP HOOK SPACER ...

Page 61: ...EATER PANEL 1 61 E030H9000BP HUMIDITY SENSOR 1 NN A890WB 62 E40249000GP EXHAUST GUIDE A 1 63 E202N9000BP UPPER HEATER COVER 1 64 E64179000BP HEATER BRACKET A 1 65 E67579000BP HEATER BRKT D 1 66 E630H9000GP CONVECTION HEATER 1 67 E64189000BP HEATER BRACKET B 1 68 E607F9000BP HEATER COVER 1 69 E22429000BP ADIABATIC MATERIAL 1 70 E20339000BP HEATER COVER B 1 71 E41079000GP EXHAUST GUIDE B 1 72 E09230...

Page 62: ...M 1 D2 E30214000AP DOOR KEY SPRING 1 D3 E30188000BP DOOR KEY A 1 D4 E302K9000BP DOOR E 1 D5 E30859000BP DOOR C 1 D6 E30067300AP HINGE 1 When ordering any door component also order door C this part may become damaged during dissassembly of the door 21 Escutcheon Base Assembly 62 ...

Page 63: ...603L4V30SP P C B AU 1 NN A860WB SPG E6 E6629 1600 RIBBON CABLE 1 E7 E82564V20BP DOOR OPENING LEVER 1 E8 E603Y4V20BP P C B DU 1 NN A890WB E8 E603Y4V30BP P C B DU 1 NN A860WB E9 E83264V20BP DISPLAY SHEET 1 E10 E00074V30SP NAME PLATE 1 E11 E83374V20HSP ESCUTCHEON SHEET 1 NN A890WB SPG E11 E83374V30HSP ESCUTCHEON SHEET 1 NN A860WB SPG When ordering the escutchoen base also order the name plate 22 Pack...

Page 64: ...64 ...

Page 65: ... E060V8020BP WIRE RACK LOW 1 37mm P13 E06435870GS RUBBER FOOT RED 4 3mm P14 E01084V20EP TRAY PACKING 1 P15 E01024V20HSP CARTON BOX 1 NN A890WB P15 E01024V30HSP CARTON BOX 1 NN A860WB P16 E01059000BP LOWER FILLER 1 P17 E01069000BP COVER POLYTHENE 1 P18 E01079000BP DOOR SHEET 1 P19 E01049000BP UPPER FILLER 1 23 REF No 8 E607X4V20BP Noise Filter U Ref No Part No Part Name Description Qty Remarks R1 E...

Page 66: ...REF No 2 Set Microwave Oven Model Number NN TKA80W E1603A510HBP 1 E1601A540HBP 1 NN A890WB NN A860WB Instalation Guide A0003A810BP 25 Digital Programmer Circuit Schematic 26 Key Board Matrix 27 Digital Programmer Circuit Parts 27 1 E603L4V20SP E603L4V30SP DPCAU 66 ...

Page 67: ...41 AERJ3GSYJ331 330 Chip Resistor 5 0 R514 AERJ3GSYJ364 360K Chip Resistor 1 0 R331 AERJ3GSYJ471 470 Chip Resistor 1 1 R224 R225 AERJ3GSYJ472 4 7K Chip Resistor 2 2 R511 AERJ3GSYJ473 47K Chip Resistor 1 0 R516 AERJ3GSYJ514 510K Chip Resistor 1 0 R508 AERJ3GSYJ562 5 6K Chip Resistor 1 0 R40 R48 AERJ3GSYJ683 68K Chip Resistor 9 9 R515 AERJ3GSYJ754 750K Chip Resistor 1 0 R503 AERJ3GSYJ822 8 2K Chip R...

Page 68: ...9GR NPN Transistor 3 3 C10 EEUFC1C471B 470uF 16 V Elect Capa 1 1 C12 EEUFC1C471B 470uF 16 V Elect Capa 1 0 C12 ECEA1CKA100B 10uF 16V Electrolytic Capacitor 0 1 R27 ERX12SJ1R0E 1R 1 2 Watt Resistor 1 1 L12 ELEKN221KA 220uH 1 0 CN3 AEEMXF00703B 3 Pin Connector Inverter 1 1 CN8 AEEMMF00703W 3 Pin Connector Figaro Sensor 1 0 CN7 AEEMMF00703R 3 Pin Connector OvenThermistor 1 1 CN4 AEEMXF01D05W 5 Pin Co...

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