Panasonic NN-SN960S Service Manual
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Panasonic NN-SN960S Service Manual

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NN-SN960S
APH (USA)
© Panasonic Home Appliances Microwave Oven
(Shanghai) Co., Ltd. 2010.
ORDER NO.PHAMOS1006051C1

Microwave Oven

E1

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Summary of Contents for Panasonic NN-SN960S

  • Page 1: Microwave Oven

    ORDER NO.PHAMOS1006051C1 Microwave Oven NN-SN960S APH (USA) © Panasonic Home Appliances Microwave Oven (Shanghai) Co., Ltd. 2010.
  • Page 2 NN-SN960S...
  • Page 3 NN-SN960S...

  • Page 4: Table Of Contents

    NN-SN960S CONTENTS Page Page 1 SCHEMATIC DIAGRAM 5.4. Inverter power supply (U) 2 DESCRIPTION OF OPERATING SEQUENCE 5.5. Temperature thermistor 2.1. Variable power cooking control 6 MEASUREMENTS AND ADJUSTMENTS 2.2. Inverter power supply circuit 6.1. Adjustment of primary latch switch, secondary latch switch 2.3.

  • Page 5: Schematic Diagram

    NN-SN960S 1 SCHEMATIC DIAGRAM...

  • Page 6: Description Of Operating Sequence

    NN-SN960S 2 DESCRIPTION OF OPERATING SEQUENCE 2.1. Variable power cooking 2.3. Inverter defrost control When the Auto Control feature is selected and the Start button is tapped: High Voltage Inverter Power Supply (U) controls output power 1. The digital programer circuit determines the power level and by the signal from Digital Programmer Circuit (DPC).

  • Page 7: Sensor Reheat

    NN-SN960S 2.5. Sensor reheat Explanation of the Auto Sensor Cooking process 1. During the first 10 second period there is no microwave Auto Sensor Reheat is a quick and easy way to reheat activity. When calculating the T2 time by using the refrigerated and room temperature foods.

  • Page 8: Cautions To Be Observed When Troubleshooting

    NN-SN960S 3 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING Unlike many other appliances, the microwave oven is a high voltage, high current device. Though it is free from danger in ordinary use, extreme care should be taken during repair. CAUTION Servicemen should remove their watches and rings whenever working close to or replacing the magnetron.

  • Page 9: Part Replacement

    NN-SN960S 3.6. Verification after repair Discharging the high voltage capacitors WARNING 1. After repair or replacement of parts, make sure that the There is high voltage present with high current capabilities screws of the oven, etc. are neither loosen or missing.

  • Page 10: Disassembly And Parts Replacement Procedure

    NN-SN960S 4 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 4.1. Magnetron 4.2. Digital programmer circuit (D.P.C) 1. Discharge high voltage charge. 2. Remove 1 screw holding air guide A on the oven cavity. CAUTION: 3. Remove 1 screw holding air guide B.

  • Page 11: Low Voltage Transformer And/Or Power Relays (Ry1, Ry2)

    NN-SN960S 4.3. Low voltage transformer 4.5. Door assembly and/or power relays (RY1, 1. Remove door C from door E by carefully pulling outward, RY2) starting from upper right hand corner using a flat blade screwdriver. CAUTION: 2. Separate door E from tabs on door A and remove door A.

  • Page 12: Turntable Motor

    NN-SN960S 4.6. Turntable motor 4.7. Steam sensor 1. Remove the motor cover by breaking off at the 8 spots 1. Disconnect connector CN2 from digital programmer circuit indicated by arrows with a cutter or the like. board. 2. Disengage catch hooks on sensor cover C from orifice.

  • Page 13: Inverter Power Supply

    NN-SN960S 4.8. Inverter power supply 6. Press 1 encircled locking tab and then slide 4 locking tabs of Inverter bracket at the bottom of the base in direction of CAUTIONS arrows. 1. Always leave the grounding plate in place. 2. Always securely tighten the ground screw through the bottom of the chassis (base).

  • Page 14: Component Test Procedure

    NN-SN960S 5 COMPONENT TEST PROCEDURE 5.3. Magnetron WARNING 1. High voltage is present at the output terminals of the High Voltage Inverter (U) including aluminum heat sink during any cook cycle. Continuity checks can only indicate an open filament or a 2.

  • Page 15: Inverter Power Supply (U)

    NN-SN960S 5.4. Inverter power supply (U) 5. Program oven at High power for 1 minute and press [Start] button. DO NOT try to REPAIR H.V. Inverter power supply (U). a. After approximately 3 seconds, oven stops operating. Replace complete H.V. Inverter(U) Unit.

  • Page 16: Measurements And Adjustments

    NN-SN960S 6 MEASUREMENTS AND ADJUSTMENTS 6.1. Adjustment of primary latch switch, secondary latch switch and monitor interlock switch. 1. Mount the Primary latch switch, the Secondary latch switch and the Monitor interlock switch to the door hook assembly as shown in illustration.

  • Page 17: Procedure For Measuring Microwave Energy Leakage

    NN-SN960S 7 PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 7.2.1. Measurement with the outer panel removed. Whenever you replace the magnetron, measure for radiation leakage before the outer panel is installed and after all necessary components are replaced or adjusted. Special care should be taken in measuring around the magnetron.

  • Page 18: At Least Once A Year, Have The Radiation Monitor Checked For Calibration By Its Manufacturer

    NN-SN960S 7.4. At least once a year, have the radiation monitor checked for calibration by its manufacturer.

  • Page 19: Troubleshooting Guide

    NN-SN960S 8 TROUBLESHOOTING GUIDE DANGER: HIGH VOLTAGES 1. DO NOT RE-ADJUST PRESET CONTROL on the H.V.Inverter (U). It is very dangerous to repair or adjust without proper test equipment because this circuit generates very large current and high voltage. Operating a misaligned inverter circuit is dangerous.

  • Page 20: Troubleshooting) Other Problems

    NN-SN960S 8.2. (Troubleshooting) Other problems SYMPTOM CAUSE CORRECTIONS 1. Oven is dead. 1. Open or loose lead wire harness Fuse is OK. 2. Open thermal cutout / thermistor Check thermal cutout is defective. No display and no operation at all.

  • Page 21: Troubleshooting Of Inverter Circuit (U) And Magnetron

    NN-SN960S 8.3. Troubleshooting of inverter circuit (U) and magnetron This oven is programmed with a self diagnostics failure code system which will help for troubleshooting. H95, H97, H98 and H99 are the provided failure codes to indicate magnetron and inverter circuit problem areas. This section explains failure codes of H95, H97, H98 and H99.

  • Page 22: Trouble Related To Digital Programmer Circuit

    NN-SN960S 8.4. Trouble related to Digital Programmer Circuit SYMPTOM STEP CHECK RESULT CAUSE/CORRECTIONS No display when oven is first plugged Fuse pattern of D.P.C. Normal →Step2 Open Replace D.P.C. or Fuse Pattern Low voltage transforment (L.V.T.) Abnormal 0V L.V.T. secondary voltage →Step3...

  • Page 23: Simple Way Of H.v. Inverter/Magnetron Troubleshooting

    NN-SN960S 8.5. SIMPLE WAY OF H.V. INVERTER/MAGNETRON TROUBLESHOOTING Purpose: Simple way (3/37 seconds rule) of identifying whether it’s Magnetron, Inverter or others. Set-up: The unit under question is connected through the Ammeter as shown below. Procedure: Follow the matrix table below to identify the problem source.

  • Page 24: How To Check The Semiconductors Using An Ohm Meter

    NN-SN960S 8.7. How to check the semiconductors using an OHM meter...

  • Page 25: Exploded View And Parts List

    NN-SN960S 9 EXPLODED VIEW AND PARTS LIST 9.1. EXPLODED VIEW...

  • Page 26: Parts List

    NN-SN960S 9.2. PARTS LIST NOTE: 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.

  • Page 27: Escutcheon Base Assembly

    NN-SN960S 9.3. ESCUTCHEON BASE ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks F603L8W80AP D.P.CIRCUIT (AU) F800L9Q90SAP ESCUTCHEON BASE (U) F891P4M60SCP DOOR OPENING BUTTON (U) F82564M60AP DOOR OPENING LEVER F80375K00AP COOK BUTTON SPRING F630Y9Q90SAP MEMBRANE SWITCH (U) F81278D60AH...

  • Page 28: Door Assembly

    NN-SN960S 9.4. DOOR ASSEMBLY Ref. No. Part No. Part Name & Description Pcs/Set Remarks F30186P40AG DOOR KEY A F301A8P30SAP DOOR A (U) F302K4U00AP DOOR E (U) F30215G10XN DOOR KEY SPRING F30854U00AP DOOR C F31454U00AP DOOR SCREEN A F02459660AP DHHS LABEL...

  • Page 29: Wiring Materials

    NN-SN960S 9.5. WIRING MATERIALS Ref. No. Part No. Part Name & Description Pcs/Set Remarks F030A9R30AP LEAD WIRE HARNESS F030E8W50AP H.V.LEAD WIRE F03537B70AP LEAD WIRE HARNESS (U) (INCLUDING THERMISTOR)

  • Page 30: Packing And Accessories

    NN-SN960S 9.6. PACKING AND ACCESSORIES Ref. No. Part No. Part Name & Description Pcs/Set Remarks F00039Q90AP INSTRUCTION MANUAL F01029Q90SAP PACKING CASE,PAPER F01044W00AP UPPER FILLER F01054W00AP LOWER FILLER F01064W00AP P.E.BAG F01074U00AP DOOR SHEET F06014M00AP COOKING TRAY F01084M00AP TRAY PACKING F00065G40AP CAUTION LABEL...

  • Page 31: Digital Programmer Circuit

    NN-SN960S 10 DIGITAL PROGRAMMER CIRCUIT 10.1. SCHEMATIC DIAGRAM...
  • Page 32 NN-SN960S...

  • Page 33: Parts List

    NN-SN960S 10.2. PARTS LIST Ref. No. Part No. Part Name & Description Pcs/Set Remarks BZ210 L0DDEA000014 BUZZER 2.0KHz F2A1V471B281 AL CHEM CAPACITOR 470µF/35V C13,C16 F2A1C220B624 AL CHEM CAPACITOR 22µF/16V C482 F2A1H1R0B574 AL CHEM CAPACITOR 1µF/50V C483 F2A1HR47B574 AL CHEM CAPACITOR 0.47µF/50V...

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