Panasonic NN-J993 Service Manual
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Panasonic NN-J993 Service Manual

Panasonic NN-J993 Service Manual

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Order No. MOD0311270C3
Microwave Oven
NN-J993
SPECIFICATIONS
1

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Summary of Contents for Panasonic NN-J993

  • Page 1 Order No. MOD0311270C3 Microwave Oven NN-J993 SPECIFICATIONS...

  • Page 3: Feature Chart

    1. FEATURE CHART 2. CONTROL PANEL 3. OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST 4. SCHEMATIC DIAGRAM 5. DESCRIOTION OF OPERATING SEQUENCE 6. STEAM FUNCTION (STEAM & MICRO POWER AND Reheat with STEAM.) 7. CAUTIONS TO BE OBSERVED WHENCAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 8.
  • Page 4 NN-J993 4 SCHEMATIC DIAGRAM...

  • Page 5: Description Of Operating Sequence

    NN-J993 5 DESCRIPTION OF OPERATING SEQUENCE 5.1. Variable power cooking control HIGH VOLTAGE INVERTER POWER SUPPLY (U) controls output power by the signal from Digital programmer Circuit (DPC). Power relay 2 stays on while 1000W to 300W selection but the inverter drive signal to control it‘s output power 150 W and 100 W will be ON-OFF controlled.
  • Page 6 NN-J993 5.4. Combination cooking control the heater will only be on when it is needed and off when it is not needed. Combination cooking is accomplished by microwave and NOTE 2: As for temperatures of combination cooking for convection cooking being done alternately during one convection, the temperatures by each program are combination cooking cycle.
  • Page 7 NN-J993 6 STEAM FUNCTION (STEAM & MICRO POWER AND Reheat with STEAM.) 6.1. Water supply 6.2. Operation As showing in figure, water in water tank will be pumped up and When pushing start bottom, oven preheat will start and then supply to the steam generation heater located inside back water supply begins.

  • Page 8: Cautions To Be Observed When Troubleshooting

    NN-J993 7 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING Unlike many other appliances, the microwave oven is high- voltage, high-current equipment. Though it is free from danger in ordinary use, extreme care should be taken during repair. 7.1. Check the grounding Do not operate on a 2-wire extension cord.
  • Page 9 NN-J993 rating for these models. 3. When replacing faulty switches, be sure mounting tabs are not bent, broken or therwise deficient in their ability to hold the switches. 7.5. Avoid inserting nails, wire, etc. through any holes in the unit during operation.
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  • Page 11 NN-J993...

  • Page 12: Disassembly And Parts Replacement Procedure

    NN-J993 8 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE...
  • Page 13 NN-J993 8.1. Inverter PCB 6. Remove ceramic cover from oven cavity. 7. Remove back panel (3 screws). * When removing cabinet, unplug and wait for 30 seconds then discharge high voltage remaining in high voltage capactior. 1. Remove frame (Remove 2 screws to slide out.).
  • Page 14 NN-J993 14. Carefully pull up base plate from front side, bent holding tab as shown in figure. 15. Stand base plate by holding tabs Warning: Any lead wire should not be caught by base. 18. Inverter PCB 1. Release CN701/CN702/CN703 connectors 2.
  • Page 15 NN-J993 8.2. Steam heater 3. Remove fan motor unit. a. Remove 2 screws. 1. Follow inverter PCB removing steps 1-16. b. Release holding tabs. 2. Release 2 lead wire from thermal cutout. 3. Relese steam heater terminal lead wire (2).
  • Page 16 NN-J993 8.7. Upper heater 8.8. Back Heater 8.7.1. Remove upper heater 1. Remove frame. 2. Remove outer cabinet. 1. Remove frame (2 screws). 3. Remove back cover. 2. Remove outer cabinet (9+3 screws). Slide left to remove. 3. Remove lead wire terminal.
  • Page 17 NN-J993 8.9. Antenna motor 1. Follow inverter PCB removing steps 1-16 first. 2. Unplug connector. 5. Remove fan blade (M4 nut + spring washer). 3. Remove screws. 8.10. Convection fan motor 1. Remove frame. 2. Remove cabinet. 6. Remove IR sensor.
  • Page 18 NN-J993 8.11. Oven thermistor 8.12. Shelf NOTE: If you are doubt about following pocedures please 1. Remove frame replace by whole lead wire harness. 2. Remove outer cabinet Replace thermister. 3. Locate oven just off the table and insert screw driver to push 1.
  • Page 19 NN-J993 8.13. Door Parts 1. Remove 2 knobs (E2). 2. Remove knob trim (E5 & E6) by releasing 3 hooks inside hole. 3. Use cutter blade or like to pick up escutchen sheet edge to start peel off where you can find gap between door and escutchen sheet.

  • Page 20: Component Test Procedure

    NN-J993 9 COMPONENT TEST PROCEDURE 9.3. Magnetron (NEW H.V.) Continuity checks can only indicate an open filament or a shorted magnetron. To diagnose for an open filament or shorted magnetron. 1. Isolate magnetron from the circuit by disconnecting the leads.
  • Page 21 NN-J993 9.4. Inverter Power supply (U) (NEW H.V.) Replace as whole H.V. Inverter (U) Unit. DO NOT try to REPAIR this H.V. Inverter power supply (U). Refer to warning on page 2. 9.6. Temperature thermistor Those sensor monitors the heat produced by the heater circuit 9.5.
  • Page 22 NN-J993 9.7. How to Set Test Mode 9.9. Microwave Oscillation Test 9.8. IR Sensor...
  • Page 23 NN-J993 9.10. Heater Test 9.11. AC Line Voltage Standard Adjust You Must Conduct This Procedure When Replacing IR Sensor.

  • Page 24: Measurements And Adjustments

    NN-J993 10 MEASUREMENTS AND ADJUSTMENTS 10.1. Adjustment of Primary latch switch, Secondary latch switch and short switch 1. When mounting primary latch switch, secondary latch switch and short switch to door hook assembly, mount the primary latch switch, the Secondary latch switch and the short switch to the door assembly as shown in table.

  • Page 25: Troubleshooting Guide (New H.v.)

    NN-J993 11 TROUBLESHOOTING GUIDE (NEW H.V.)
  • Page 26 NN-J993...
  • Page 27 NN-J993...

  • Page 28: How To Check The Semiconductors Using An Ohm Meter

    NN-J993 12 HOW TO CHECK THE SEMICONDUCTORS USING AN OHM METER...

  • Page 29: Exploded View And Parts List

    NN-J993 13 EXPLODED VIEW AND PARTS LIST...
  • Page 30 NN-J993 13.1. Parts List Do not use description of the part. Important safety notice: Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufactures’s specified parts. Alphabet marks in Remarks colums (l. e. HPE etc.) indicate parts applicable to only specified country models as follows.
  • Page 31 NN-J993 Ref. No. Part No. Part Name & Description Pcs\Set Remarks ANE0926000AC Cushion Rubber A202K-1F30 Antenna (U) A2236-1F30 Right Heater Panel A2237-1F30 Left Heater Panel A2239-1E20 Circulation Fan A2241-1E20 Back Heater Panel A2260-1E20 Adiabatic Material E A300B-1E20 Hinge (Left) A300U-1E20...
  • Page 32 NN-J993 13.2. Door Assembly Ref. No. Part No. Part Name & Description Pcs/Set Remarks A302C6E10MP Door U HPE/LPK/MPQ/TPE/YPQ A302C6E10WT Door U A302C6E10XP Door U A3044-1E10 Door Arm (Right) A390C-1F30 Door C (U)
  • Page 33 NN-J993 13.3. Escutcheon Base Assembly Ref. No. Part No. Part Name & Description Pcs/Set Remarks A605Q6E10MP PCB F (U) TPE/HPE/LPK/XPE A605Q6E10WT PCB F (U) A605Q6E10XP PCB F (U) A800D-1F30G Knob A8034-1F50 Escutcheon Base A83376E10MP Escutcheon sheet All expect XPE A83376E10XP...
  • Page 34 NN-J993 13.4. Packing and Accessories Ref. No. Part No. Part Name & Description Pcs/Set Remarks A01026E10MP Packing case Paper TPE/HPE/LPK/XPE A01026E10WT Packing case Paper A01026E10XP Packing case Paper A01046E10MP Upper filler A01056E10MP Lower filler A0106-1450 Vinyl Cover A000B6E10MP Cook book...
  • Page 35 NN-J993 13.5. Wiring Material Ref. No. Part No. Part Name & Description Pcs/set Remarks A030A6E10MP Lead Wire Harness A030E6E10MP Lead Wire All except WTT A030E6E10WT Lead Wire A030H6E10MP Lead Wire A03956E10MP Lead Wire A03576E10MP Lead Wire A03566E10MP Lead Wire...
  • Page 36 NN-J993 13.6. Water Tank Assembly Ref. No. Part No. Part Name & Description Pcs/Set Remarks A0213-1E10 Pipe holder A0606-1E10 Water filter A060Q6E10MP Water tank U A060Q6E10XP Water tank U A06116E10MP Tank Lid A0639-1E10 Bracket A0655-1E10 Door A2342-1E10 Bracket A3239-1E10 Spring...
  • Page 37 Order No. MOD0311270C3 Microwave Oven NN-J993 © 2003 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying distribution is a violation of law.
  • Page 38 NN-J993...

  • Page 39: Table Of Contents

    NN-J993 CONTENTS Page Page 1 FEATURE CHART 7 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 15 2 CONTROL PANEL 8 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 19 3 OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST 9 COMPONENT TEST PROCEDURE PROCEDURE 10 MEASUREMENTS AND ADJUSTMENTS 4 SCHEMATIC DIAGRAM 11 TROUBLESHOOTING GUIDE (NEW H.V.)
  • Page 40 NN-J993 1 FEATURE CHART...
  • Page 41 NN-J993 2 CONTROL PANEL...
  • Page 42 NN-J993...
  • Page 43 NN-J993...
  • Page 44 NN-J993 3 OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE...
  • Page 45 NN-J993...
  • Page 46 NN-J993...

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