Ferguson-403RG-rec-维修说明书手册含电器原理图

Teguson4PRELIMINARY SERVICEDATASCHEDULE A PRODUCTIONREMOVING UNITS FORSERVICERECEIVER CHASSISRemove the rear panel and dis.connect all inter-connecting plugsand sockets.Loosen and turn asidethe clamps securing the sideflanges and draw the chassis outof the cabinet.RECORD CHANGERRemove both rear panels andwithdraw the motor mains supplyplug from the receiver chassis andpick-up connector from the tapeamplifier.The mains supply tothe motor feeds the neon indicatorlamp.and this lead must also bedisconnected at the connectingblock at the base of the cabinet.Release the spring clips securingthe rocord changer and lift theunit out of the cabinet.TAPE DECKRemove the rear panel and dis-connect the 12-way and 4-wayGENERAL NOTESconnectors from the amplifierchassis.The mechanical couplingRECEIVER CHASSISsections of V6B (EABC80)as thelever from the Speed Selector todetector.The D.C.component ofthe compensation switch on theA.M.Reception:The mediumand long wave ferrite-rod aerial isthe rectified signal developedamplifier should then be discon-across R16 and R17 is boosted bynected.The tape deck is securedelectrostatically screened to im-prove its directional propertiesa voltage doubling network em-at the sides and rear by threeploying a crystal diode W22 BA screws ond nuts,the nutsand is rotatable.When the aerialbeing accessible from underneathcontrol knob is turned fully clock-OA7I)and used as A.G.C.biasusing a box spanner.When thesewise,the rod aerial is switched outfor V2 and V3.W2 and R65are withdrawn,the unit may beof circuit and a coupling and tun-shunted by C84 are connected ining coil for an external aerial isseries across the I.F.T.secondarylifted out of the cabinet.switched in.The external aerialL28.The D.C.voltage developedTAPE AMPLIFIERsocket is connected through twoacross R65 therefore adds to theFirst,remove the tape deck assimilar inductances (LI and L2)tovoltage developed across R16 anddescribed above and withdraw thethe V.H.F./F.M.aerial sockets soRI7,the A.G.C.line being fedinter-connecting plugs and socketsthat the V.H.F.dipole,internal orthough R15.from the receiver chassis,pick-upexternal,functions also as an A.M.V.H.F./F.M.Reception:Theand microphone input jack.Loosenaerial.V.H.F.tuner unit employs aand turn aside the clamps securingV2 (ECH8I)and V3 (EF89)double triode VI (ECC85)operat-the side flanges and draw theoperate as frequency changer anding as an earthed grid R.F.ampli-chassis out of the cabinet.I.F.amplifier and one of the diodefier and mixer/oscillator.V2 andINITIAL COPY ISSUED FREE TO FERGUSON ACCREDITED DEALERSADDITIONAL COPIES 1/-