Panasonic NN-K593MF Service Manual

5.1. Magnetron1. Discharge high voltage charge.2. Remove 1 screw holding air guide A.3. Remove 1 screw holding air guide F.4. Remove 1 screw holding themistor.5. Disconnect 2 high voltage lead wires from magnetronfilament terminals.6. Remove 4 screws holding the magnetron.NOTE:After replacement of the magnetron, tighten mountingscrews properly making sure there is no gap betweenthe waveguide and the magnetron to preventmicrowave leakage.CAUTIONWhen replacing the magnetron, be sure the antenna gasket is inplace.5.2. Digital programmer circuit(D.P.C) and membrane keyboard.NOTE:Before handing the D.P.C ensure that your body isconnected to ground to discharge any electric charge.1. Disconnect all connectors from D.P.C.2. Remove 1 screw holding escutcheon base and slide theescutcheon base upward slightly.3. Remove 1 screw holding D.P.C.4. Release lock of connector CN6 by pushing both levels toinside and pull them upward, and remove flat cable ofmembrane keyboard.5. Separate D.P.C board from tabs on the escutcheon baseand remove D.P.C board.To replace membrane key board6. Push the upper part of key board (display window portion)from back of escutcheon base and peel off escutcheonsheet and membrane key board completely fromescutcheon base.NOTE:1. The membrane key board is attached to theescutcheon base with double faced adhesive tape.Therefore, applying hot air such as using a hair dryer isrecommended for smoother removal.2. When installing new membrane key board, makesure that the surface of escutcheon base is cleanedsufficiently so that any problems (shorted contacts oruneven surface) can be avoided.3. Alignment position of membrane key board is asfollows;Membrane key board: Right and upper edgesEscutcheon sheet: Right and upper edges5 DISASSEMBLY AND PARTS REPLACEMENTPROCEDURE10NN-S453WF