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Matsushita Electric NN-V688W Service Manual

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ORDER NO. MOD9812220C3
Microwave Oven
NN-V688W / NN-V688WS / NN-V698J / NN-V698JS / NN-
V668W / NN-V668WS
SPECIFICATIONS
1998 Matsushita Electric Industrial Co., Ltd. All rights reserved.
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  • Page 1 ORDER NO. MOD9812220C3 Microwave Oven NN-V688W / NN-V688WS / NN-V698J / NN-V698JS / NN- V668W / NN-V668WS SPECIFICATIONS 1998 Matsushita Electric Industrial Co., Ltd. All rights reserved.

  • Page 2: Control Panel

    Unauthorized copying and distribution is a violation of law. 1. CONTROL PANEL...

  • Page 3: Operation And Digital Programmer Circuit Test Procedure

    2. OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE...
  • Page 5 3. SCHEMATIC DIAGRAM (KNQ, MNQ, SNM, YNQ)
  • Page 6 4. SCHEMATIC DIAGRAM (HNE, LNK, TNE)
  • Page 7 5. SCHEMATIC DIAGRAM (XNE)
  • Page 8 6. SCHEMATIC DIAGRAM (WNT)

  • Page 9: Description Of Operating Sequence

    7. DESCRIPTION OF OPERATING SEQUENCE 7.1. Variable power cooking control HIGH VOLTAGE INVERTER POWER SUPPLY (U) controls output power by the signal from Digital Programmer Circuit (DPC). Power relay 1 stays on but the inverter drive signal to control it's output power. NOTE 1: The ON/OFF time ratio does not correspond with the percentage of microwave power since approximately 2 seconds are required for heating of magnetron filament.

  • Page 10: Grill Cooking

    7.2. Grill cooking The digital programmer circuit generates the power relay 4 control signal at ON time during grill cooking. 7.3. Combination cooking Combination cooking is accomplished by microwave and grill cooking. The digital programmer circuit controls ON-OFF time of power relay 1 and 4 as shown in the table. NOTE: After grill and combination cooking, fan motor rotates for 1 minute to cool oven and electric components.
  • Page 11 7.5. One touch cooking (Auto sensor cooking) Auto sensor cooking is a revolutionary way to cook by microwave without setting a power level or selecting a time. All that is necessary is to select an Auto Sensor Program before starting to cook. Understanding Auto Sensor Cooking As a food cooks, a certain amount of steam is produced.

  • Page 12: Auto Sensor Reheat

    make sure this 10 seconds is subtracted from the T1 time. In other words T1 time starts at the end of the 10 second period. 2. T1 time The total amount of time it takes the microwave oven to switch to T2 time after the 10 second period. 3.

  • Page 13: Cautions To Be Observed When Troubleshooting

    8. 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. 8.1. Check the grounding Do not operate on a 2-wire extension cord. The microwave oven is designed to be used when grounded.

  • Page 16: Avoid Inserting Nails, Wire, Etc. Through Any Holes In The Unit During Operation

    8.3. When parts must be replaced, remove the power plug from the outlet. 8.4. When the 10A 250V fuse is blown due to the operation of short switch: 1. This is mandatory. Refer to "Adjustments and Measurement" for these switches. 2.

  • Page 17: Disassembly And Parts Replacement Procedure

    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.
  • Page 18 NOTE: Magnetron used for this modes is unique type for inverter power supply system. Make sure to use the one as listed in the part list. 9.2. High Voltage Inverter Power Supply (U) (NEW H.V.) 1. Release 2 clips of air guide 1, 2. 2.

  • Page 21: Digital Programmer Circuit (Dpc) And Membrane Key Board

    9.3. Digital programmer circuit (DPC) and membrane key board. NOTE: Be sure to ground any static electric charge built up on your body, before handling the DPC. 1. Disconnect all connectors from D.P.C. 2. Remove 2 screws holding escutcheon base and slide the escutcheon base upward slightly.
  • Page 22 9.4. Door assembly 1. Remove H. V. Inverter (U) refer to previous column 2. 2. Remove door spring right side. NOTE: Please hold door unless door become fall down. 3. Remove door arm lever by pushing tab and turn clock wise. 4.

  • Page 24: Turntable Motor

    9.5. Turntable motor 1. Breaking off at 5 spots indicated by allow with a cutter or like. 2. Remove 2 screws holding motor cover. 3. Disconnect 2 lead wires from turntable motor. 4. Remove 2 screws holding turntable motor. NOTE: Make sure to remove sharp barrs at 5 spots to avoid possible injury. 9.6.

  • Page 25: Component Test Procedure

    10. COMPONENT TEST PROCEDURE 10.1. Primary Latch Switch, Secondary (Secondary Latch Switch and Power Relay 1) Interlocks. 1. Unplug the lead connectors to Power Relay 1 and verify continuity of the power relay 1 1-2 terminals. 2. Unplug lead connectors to Primary Latch Switch and Secondary Latch Switch.

  • Page 26: Membrane Key Board (Membrane Switch Assembly)

    2. Connect test probes of ohm meter to the disconnected leads which were connected to H. V. Inverter. 3. Test the continuity of short switch with door opened and closed positions using lowest scale of the ohm meter. Normal continuity readings should be as follows. 10.3.
  • Page 27 10.6. Inverter Power Supply (U) (NEW H,V,) DANGER HIGH VOLTAGE Test if failufe codes of H97 or H98 appears by doing the following procedure. It is recommended to used an AC line input current Ampare meter for testing. Test 1 1.

  • Page 28: Steam Sensor And Digital Programmer Circuit

    If both 1 and 2 are OK, the Inverter Power Supply (U) can be determined OK. 10.7. Steam Sensor and Digital Programmer Circuit In order to determine if the steam sensor function of the digital programmer circuit is in working order or not, do the following test.

  • Page 29: Measurement Of Microwave Output

    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 components test procedures. 11.2. Measurement of microwave output The output power of magnetron can be determined by performing IEC standard test procedures. However, due to the complexity of IEC test procedures, it is recommended to test the magnetron using the simple method outlined below.
  • Page 30 12. TROUBLESHOOTING GUIDE (NEW H.V.)
  • Page 31 Fig. TROUBLESHOOTING GUIDE 1...
  • Page 32 Fig. TROUBLESHOOTING GUIDE 2 Fig. TROUBLESHOOTING GUIDE 3...

  • Page 34: How To Check The Semiconductors Using An Ohm Meter

    13. HOW TO CHECK THE SEMICONDUCTORS USING AN OHM METER...

  • Page 35: Introducing Of Test Jigs

    14. INTRODUCING OF TEST JIGS 1. "Power Check" (Microwave Oven Tester) This tester can be measure both line voltage and ampares at a time for easy and quick testing microwave oven. Part number/Plug and Outlet type 2. Universal outlet...

  • Page 36: Exploded View And Parts List

    3. Stainless steel ruler (150mm) Part No. A130005-150 It is convenient to use for adjustment of door. Also it is convenient to use for removing door C. 4. Flourescent light bulb (4W) Part No. A600Z-FL4W This is convenient for check whether microwave is oscillate or not in a second. WARNING: Use it with full one litter of water load and make sure less than 10 seconds oscillation on each time.
  • Page 37 A3105-1830 LATCH BRACKET XTWANE4+8SW SCREW (4X8) FOR FAN MOTOR A3249-1830 LATCH SWITCH LEVER B A400A4760JP FAN MOTOR NN-V668W KNQ NN-V668WS NN-V688W NN-V688WS NN-V698J HNE KNQ/MNQ/TNE/YNQ NN-V698JS (26W) A400A9760JP FAN MOTOR NN-V668W SNM NN-V698J LNK/SNM A400A5180AP FAN MOTOR NN-V698J WNT (27W)
  • Page 38 A40314J00XN AIR GUIDE C (U) A41074J00XN EXHAUST GUIDE B A41444J00XN ORIFICE A60304080BP INCANDESCENT LAMP NN-V668W NN-V668WS NN-V688W NN-V688WS NN-V698J HNE/KNQ LNK/MNQ/SNM/TNE/YNQ NN-V698JS (20W/240V) ANE6030540AP INCANDESCENT LAMP NN-V698J WNT (125V/20W) A606Y4J20QP H.V.INVERTER (U) NN-V668W KNQ NN-V688W MNQ/YNQ NN-V698J KNQ/MNQ/YNQ A606Y4J00XN H.V.INVERTER (U)

  • Page 39: Door Assembly

    A01574J10HN NAME LABEL NN-V688W HNE A01574J10MN NAME LABEL NN-V688W MNQ A01574J10XN NAME LABEL NN-V688WS A01574J10TN NAME LABEL NN-V688W TNE (THAI & ENGLISH) A01574J10YN NAME LABEL NN-V688W YNQ A01574J00HN NAME LABEL NN-V698J HNE A01574J00KN NAME LABEL NN-V698J KNQ A01574J00LN NAME LABEL...

  • Page 40: Escutcheon Base Assembly

    Ref. No. Part No. Part Name & Description Pcs/Set Remarks A302K4J00XN DOOR E (U) A302A4J10HXN DOOR A (U) NN-V668W NN-V668WS NN-V688W NN-V688WS A302A4J00NXN DOOR A (U) NN-V698J NN-V698JS A3044-1640 RIGHT DOOR ARM A3054-1640 LEFT DOOR ARM A30854J00XN DOOR C A3252-1450...

  • Page 41: Packing And Accesories

    NN-V668W KNQ RTL (W/COMPONENT) A603L4J20SN D.P.CIRCUIT (U) NN-V668W SNM RTL (W/COMPONENT) A603L4J20XN D.P.CIRCUIT (U) NN-V668WS RTL (W/COMPONENT) A603L4J10HN D.P.CIRCUIT (U) NN-V688W HNE RTL (W/COMPONENT) A603L4J10MN D.P.CIRCUIT (U) NN-V688W MNQ RTL (W/COMPONENT) A603L4J10XN D.P.CIRCUIT (U) NN-V688WS RTL (W/COMPONENT) A603L4J10TN D.P.CIRCUIT (U)
  • Page 42 NN-V688W NN-V698J HNE/LNK/MNQ/TNE/YNQ A00034J00XN INSTRUCTION BOOK NN-V698J WNT NN-V698JS A00147530XN PL CAUTION LABEL NN-V668WS NN-V688WS NN-V698JS A91644000XN EARTH LEAD NN-V698J TNE/WNT NN-V688W TNE A00324040XN EARTH CAUTION LABEL NN-V688W TNE NN-V698J TNE A01024J20KN PACKING CASE PAPER NN-V668W KNQ A01024J20SN PACKING CASE PAPER...

  • Page 43: Wiring Material

    20. WIRING MATERIAL WIRING MATERIAL Ref. No. Part No. Part Name & Description Pcs/Set Remarks A030A4J00XN LEAD WIRE HARNESS NN-V668W SNM NN-V668WS NN-V688W HNE/TNE NN-V688WS NN- HNE/LNK/SNM/TNE NN-V698JS A030A4J00MN LEAD WIRE HARNESS NN-V668W KNQ NN-V688W MNQ/YNQ NN-V698J KNQ/MNQ/YNQ A030A4J00WN LEAD WIRE HARNESS...
  • Page 44 21. REF NO. 41 NOISE FILTER (U) Ref. No. Part No. Part Name & Description Pcs/Set Remarks C1 2 AECQJ5225KX1 CERAMIC CAPACITOR 2.2MF A62316010BP FUSE HOLDER 22. DIGITAL PROGRAMMER CIRCUIT(NN-V698J,NN- V698JS) SCHEMATIC DIAGRAM...
  • Page 45 23. DIGITAL PROGRAMMER CIRCUIT (NN-V688W,NN- V688WS)

  • Page 47: Digital Programmer Circuit

    24. DIGITAL PROGRAMMER CIRCUIT PARTS LIST...
  • Page 48 4PIN CN5 6 AEEM09FDZBTM CONNECTOR NN-V698J NN-V698JS AEEM09FDZBTM CONNECTOR NN-V668W NN-V668WS NN-V688W NN-V688WS CX320 AEFOT8R00TWT RESONATOR NN-V668W KNQ/SNM NN-V688W HNE/ MNQ/YNQ NN-V698J HNE/KNQ/LNK/ MNQ/SNM/WNT/YNQ 8MHZ CX320 AEYXAT49-8MA RESONATOR NN-V668WS NN-V688W TNE NN-V688WS NN-V698J TNE NN-V698JS 8MHZ AEDNERA1502 DIODE SI 1.0A ERA1502 AESTS1WBA60B DIODE SI 1.0A...
  • Page 49 NN-V668W SNM NN-V698J KNQ 1/4W 5% JPR2 ERD25VJ683T CARBON FILM RESISTOR NN-V668W ZPE NN-V698J SNM 1/4W 5% JPR2 ERD25VJ152T CARBON FILM RESISTOR NN-V688W HNE NN-V698J HNE 1.5K 1/4W 5% JPR2 ERD25VJ622T CARBON FILM RESISTOR NN-V688W MNQ NN-V698J MNQ 6.2K 1/4W 5% JPR2...
  • Page 50 NN-V698J NN-V698JS 10K 1/16W 5% 193 194 195 196 197 198 199 226 229 340 R12 226 ERJ3GSYJ103V RESISTOR NN-V668W NN-V668WS NN-V688W 229 340 NN-V688WS 10K 1/16W 5% ERX12SJ1R0E RESISTOR 1/2W 5% R14 39 ERJ3GSYJ102V RESISTOR NN-V698J NN-V698JS 1K 1/16W 5%...
  • Page 51 Ref. No. Part No. Part Name & Description Pcs/Set Remarks ZD10 AESZMTZJ24C ZENER DIODE MTZJ24C...

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