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National NN-V680W Service Manual

Manual is about: Inverter System Inside

Summary of NN-V680W

  • Page 1

    © 2001 matsushita electric industrial co., ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. Nn-v690p nn-v690ps nn-v680w nn-v680ws microwave oven order no. Mod0101240c3.

  • Page 2: Contents

    1 control panel 4 2 operation and digital programmer circuit test procedure 5 3 schematic diagram 7 4 description of operating sequence 9 5 cautions to be observed when troubleshooting 11 6 disassembly and parts replacement procedure 13 7 component test procedure 18 8 measurements and adjustments 21...

  • Page 3

    20 inverter circuit 43 21 ref. No. 35 inverter (u) 44 3 nn-v690p / nn-v690ps / nn-v680w / nn-v680w.

  • Page 4: 1 Control Panel

    1 control panel 4 nn-v690p / nn-v690ps / nn-v680w / nn-v680ws.

  • Page 5: Test Procedure

    2 operation and digital programmer circuit test procedure 5 nn-v690p / nn-v690ps / nn-v680w / nn-v680w.

  • Page 6

    6 nn-v690p / nn-v690ps / nn-v680w / nn-v680ws.

  • Page 7: 3 Schematic Diagram

    3 schematic diagram 3.1. Schematic diagram (hne, knq, kke, lnk, mnq, snm, tne, ynq) 7 nn-v690p / nn-v690ps / nn-v680w / nn-v680w.

  • Page 8

    3.2. Schematic diagram (xne, zpe) 8 nn-v690p / nn-v690ps / nn-v680w / nn-v680ws.

  • Page 9

    4.1. 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 percenta...

  • Page 10

    4.5. 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 cert...

  • Page 11: 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. 5.1. Check the grounding do not operate on a 2-wire extension cord. The microwave oven is designed to be used when gro...

  • Page 12

    5.3. When parts must be replaced, remove the power plug from the outlet. 5.4. 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. When replacing the fuse, confirm that it has the appropriate rating ...

  • Page 13: Procedure

    6.1. Magnetron 1. Discharge high voltage capacitors. 2. Remove a screw holding magnetron on bracket. 3. Remove 2 high voltage lead wires. 4. Remove circulation fan motor bracket and belt. (2 screws) 5. Remove air guide. (2 screws) 6. Remove 4 screws holding magnetron. Note: after replacement of the ...

  • Page 14

    6.3. 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 with door...

  • Page 15

    6.4. Door assembly 1. Remove door spring right side. Note: please hold door unless door become fall down. 2. Remove door arm lever by pushing tab and turn clock wise. 3. Remove door spring left. 4. Insert flat blade screw driver to release hinge pin from left hinge. 5. Slide out left hinge pin to re...

  • Page 16

    6.5. 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. 6....

  • Page 17

    17 nn-v690p / nn-v690ps / nn-v680w / nn-v680w.

  • Page 18

    7.1. 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. 3. Test the continuity of...

  • Page 19

    7.5. Inverter power supply (u) (new h.V.) 7.6. Inverter power supply (u) (new h,v,) danger high voltage test 1 1. Place 1 liter of water load into oven cavity. 2. Unplug 2 pin h. V. Lead wire connector cn703 from magnetron tube. 3. Program oven at high power for 1 minute and press start. A. After ap...

  • Page 20

    Connector (cn6) from the dpc otherwise a false reading may be indicated. Note 2: if checking an oven sensor thermistor just after the microwave oven has been operating, the sensor of course won't be room temperature. In this case the sensor must be removed and allowed to cool down to the 10°c to 30°...

  • Page 21

    8.1. 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 hook assembly as shown in...

  • Page 22

    9 troubleshooting guide (new h.V.) 22 nn-v690p / nn-v690ps / nn-v680w / nn-v680ws.

  • Page 23

    23 nn-v690p / nn-v690ps / nn-v680w / nn-v680w.

  • Page 24

    1. Discharge high voltage before touching inverter pcb. 1. Unplug oven and leave it for more than 30 seconds before removing outer cabinet. 2. Use insulated lead wire to short across d701 anode to d702 cathode or short across magnetron filament terminals to the chassis ground. Please refer to servic...

  • Page 25

    1. How to check power transistors (q701, q702). To measure, suck a solder from its legs completely unless faulse reading may observe and mislead a troubleshooting. Measure across pins between e-c, e-g, c-g, e-black lead, c-red lead of tester should be infinite and may have some reading in reverse, i...

  • Page 26

    7. Apply extra solder onto q701 and q702 legs and printed foil pattern to be able to hold main large current of more than 15a. Service hint: for easy removal of solder, apply some solder first than suck it all. 8. How to test repaired inverter pcb. Warning: 1. Do not test inverter pcb with using any...

  • Page 27: Ohm Meter

    10 how to check the semiconductors using an ohm meter 27 nn-v690p / nn-v690ps / nn-v680w / nn-v680w.

  • Page 28

    11 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 28 nn-v690p / nn-v690ps / nn-v680w / nn-v680ws.

  • Page 29

    2. Universal outlet 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 secon...

  • Page 30

    12 exploded view and parts list 30 nn-v690p / nn-v690ps / nn-v680w / nn-v680ws.

  • Page 31: 13 Parts List

    13 parts list when ordering replacement part(s), please use number(s) shown in this 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, (l. E. Hne etc.) indic...

  • Page 32

    Ref. No. Part no. Part name & description pcs/ set remarks 41 a62304210bp fuse 1 10a 42 a63268960jp turntable motor 1 43 a64504j00xn exhaust guide b 1 44 a65434x80mn exhaust guide c 1 45 a65854x80mn p. C. B. Holder a 1 46 a66264j00xn thermal cutout mount 1 47 a66624x80mn ground plate 1 48 a67634x80m...

  • Page 33: 14 Door Assembly

    14 door assembly ref. No. Part no. Part name & description pcs/ set remarks d1 a302k4j00xn door e (u) 1 d2 a302a4y60ghn door a (u) 1 nn-v690p hne/kke/knq/mnq/snm/tne/ynq/lnk nn-v690ps d2 a302a4y60gzp door a (u) 1 nn-v690p zpe d2 a302a4y70hhn door a (u) 1 nn-v680w nn-v680ws d3 a3044-1640 right door a...

  • Page 34

    15 escutcheon base assembly ref. No. Part no. Part name & description pcs/ set remarks e1 a83374y60gmn escutcheon sheet 1 nn-v690p hne/mnq/tne/ynq/lnk e1 a83374y60gkn escutcheon sheet 1 nn-v690p kke/knq/snm e1 a83374y60gxn escutcheon sheet 1 nn-v690ps e1 a83374y60gzp escutcheon sheet 1 nn-v690p zpe ...

  • Page 35

    Ref. No. Part no. Part name & description pcs/ set remarks e2 a603l4y60tn d.P.Circuit (u) 1 nn-v690p tne rtl(w/component) e2 a603l4y60yn d.P.Circuit (u) 1 nn-v690p ynq rtl(w/component) e2 a603l4y60xn d.P.Circuit (u) 1 nn-v690ps nn-v680ws rtl(w/component) e2 a603l4y60ln d.P.Circuit (u) 1 nn-v690p lnk...

  • Page 36: 16 Packing And Accesories

    16 packing and accesories ref. No. Part no. Part name & description pcs/ set remarks p1 a000b4y60mn cook book 1 nn-v690p hne/mnq/tne/ynq/lnk p1 a000b5820kn cook book 1 nn-v690p kke/knq/snm p1 a000b8240zp cook book 1 nn-v690p zpe p2 a00034y60hn instruction book 1 nn-v690p hne/mnq/tne/ynq/lnk p2 a0003...

  • Page 37

    Ref. No. Part no. Part name & description pcs/ set remarks p16 a01134j00xn tray styrol 1 p17 a0192-1100 packing 1 p18 a01174j00kn tray packing 1 nn-v690p knq/kke/snm p19 a01264j00xn reinforce material 1 nn-v690p knq/kke/snm/zpe nn-v690ps nn-v680ws 37 nn-v690p / nn-v690ps / nn-v680w / nn-v680w.

  • Page 38: 17 Wiring Material

    17 wiring material ref. No. Part no. Part name & description pcs/ set remarks w1 a030a4y60mn lead wire harness 1 nn-v690p hne/mnq/ynq/tne/knq/kke/snm/lnk w1 a030a4y60xn lead wire harness 1 nn-v690p zpe nn-v690ps nn-v680ws w2 a030e4x80mn lead wire 1 w2 a030e4x80mn lead wire 1 w3 a6901-1170 ferrite co...

  • Page 39

    18 digital programmer circuit schematic diagram 39 nn-v690p / nn-v690ps / nn-v680w / nn-v680w.

  • Page 40

    40 nn-v690p / nn-v690ps / nn-v680w / nn-v680ws.

  • Page 41

    19 digital programmer circuit parts list ref. No. Part no. Part name & description pcs/ set remarks bz210 aefb22ep20tl buzzer 1 2.0khz c10 eeufc1c471b electrolytic capacitor al 1 470mf/16v/fc c11 aecess1c220a electrolytic capacitor al 1 22mf/16v c12 14 484 220 aecu1f104z25 ceramic capacitor 4 0.1mf/...

  • Page 42

    Ref. No. Part no. Part name & description pcs/ set remarks q220 aesakta200y transistor si 0.6w 1 kta200y q221 aesa14eke transistor si 0.2w 1 dta114eka/14 r10 erds2tj821t carbon film resistor 1 820k Ω Ω Ω Ω 1/4w 5% r25 26 erds1fj393t carbon film resistor 2 39k Ω Ω Ω Ω 1/2w 5% r27 220 340 341 490 491 ...

  • Page 43: 20 Inverter Circuit

    20 inverter circuit schematic diagram 43 nn-v690p / nn-v690ps / nn-v680w / nn-v680w.

  • Page 44

    21 ref. No. 35 inverter (u) ref. No. Part no. Part name & description pcs/ set remarks a697x4v00gp 1 2sa1175tfk transistor si 0.25w 1 2sa1175tfek 2sc2785tfk transistor si 0.25w 2 2sc2785tfek c701 ecwf5104n300 film capacitor 1 0.1mf 500vdc c702 ecqe2405t847 polyester capacitor 1 4mf 250vdc c703 ecwf5...