RCA-Victor-Co-Inc-94BK 电路原理图.pdf

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1、PAGE 574-C MODELS 94BK and 94BT Four -Tube, Single -Band, Battery -Operated Superheterodyne Receivers Electrical and Mechanical Specifications Frequency Range 411 t,l 1. 5u ke It -F :lignn ent Frequency 1,300 kc (use., ant.) Intermediarte Frequency 435 kc I(Ai tITHON (I TI ILEM ENT (1) I2CA-1(7 (; F

2、irst Det.-Osc. (2) R(.-1I).1G Intermediate Amp. (:t) RCA-IF7-); tiecond Det., A -F Amp., A.V.C. (4) RC: ltS U Power Output ItArrEINES ItE(1tI!WI, A, one 2 volt air cell, or one 2 -volt storage battery, or one 3 -volt dry A battery. (With latter, use No. 30935, 2.2-olun resistor in series with positi

3、ve A lead.) B, two or three 43 -volt heavy-duty B batteries. IthtENT (ONSI: PTION A at 2 volts, 0.36 amperes. B. 90 volts l 1 ma (h Cueu on) positi. 17.92.2 ma (swswitctch atat Fullrr PntoweCr ptterosition). B, 135 volts, 17.0 nta. (switch left in Current Cutter position). Model 94BT Model 94BK IVRE

4、R OUTPUT 90 -volts B MUndistorted 1 Switch at Current Cutter 0.02 watts 0.23 watts Switch at Full Power 0.16 watts 0.29 watts 135 -volts B Undistorted . .0.30 watts Maximum . 0.70 watts LOUDSPEAKER Type Permanent -magnet Dynamic Diameter (94BT) 5in., (94BK) 6; In. Voice -coil Impedance 3 ohms at 400

5、 cycles Precautionary Lead Dress 1. I.F. plate lead should be dressed close to and along edge of chassis. 2. Lead from antenna terminal should be wrapped (9 turns) around lead from ant. coil secondary to gang condenser (see schematic). 3. Antenna and ground leads should be arranged as shown in trip

6、view. VOL. CONTROL and connect the I -F screen grid Ito terminal A on first I -F transformer, Disconnect ungrounded end of C-10 from I -F screen grid and connect to the first detector screen -grid. Disconnect the green battery cable lead from the +6714 volt plug pin and connect it to the black lead

7、on the same plug (+45 volts). Replace 1C7 -G 1st detector with 1A7 -G. Replace 1D5 -G I -F with 1N5 -G. Replace 1F7 -G 2nd detector with 1H5 -G. Replace 1G5 -G output with 105-G. Use standard l, volt dry battery or Air Cell for filament supply and two 45 volt B batteries for plate supply. The Curren

8、t Cutter switch label should be removed or covered, and instructions corrected, as this switch no longer has effect. RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. A. 收音机爱 好者资料库 RadioFans.CN Alignment Cathode-ray Alignment is the preferable method. Connections for the oscil

9、lograph are shown in the chassis drawing. Output Meter Alignment.-If this method is used, connect the meter across the voice coil, and turn the receiver volume control to maximum. Test-oscillator.-For all alignment operations, connect the low side of the test -oscillator to the receiver chassis, and

10、 keep the output as low as possible to avoid a -v -c action. For additional details, refer to booklet RCA Victor Receiver Alignment. Pre-setting Dial. -With gang condenser in full mesh, the pointer should be horizontal. Re -sealing I.F. Adjustment Screws.-After completion of align- ment, seal the I.

11、F. magnetite -core adjustment screws with a few drops of household cement. 13? DET. 8 OSC. IC 7-G i W ANT. COIL - Le 9TURNs t 4e- -.b tour,. t s.4.11 cwuau CI -111,C3/ 0.1 10 388 it u MEP MMF- Y E i C7 9-189 MMF. RI 56,000 C4 56 BOTTOM VIEWS OF SOCKETS C8 l 1F. C9 100 TRAhIs 56 MMF,8(, dMMF.I I. x -

12、6 A LS LA e o i o OIGA D I. F. 1D5 -G c10 0-I MF C1-1- O L3 C6 2-10 MMF L4 0 05C. COIL 5 2.10 MMF Procedure PAGE 575-C 94BK, 94BT Steps Connect the high side of test-oscil- lator to- Tune test-osc. to- Turn radio dial to- Adjust the follow - ing for max. peak output No. 1 1D5 -G I -F grid cap, in se

13、ries with .001 mfd. 455 kc Quiet point between 550-750 kc L7 and LA (2nd I -F transformer) No. 2 1C7 -G 1st-det. grid cap, in series with -001 mid. 455 kc L5 and 1.6 (1st I -F transformer) No. 3 Antenna lead, in series with 200 mmfd. 1,500 kc 1,500 kc C5* (oscillator) C2 (antenna) * Trimmer C6 on ga

14、ng condenser should be unscrewed one com- plete turn from tight, before adjusting C5. 2N-ROET, A.F.-A.V.C. IF7-G CII 29 I -F. C12 100 TRANS IOo MMF )1f - MMF. 0 1 O 00 o L7 Le R2 2.2 MEG. C13 180 MMF RS 250,000 VOL. CON1ROL C14 .01MFD RL 820,000- C17 .01 MFO OUTPUT 1G 5-G GREEN 4 R12 h WHEN WING 3V.

15、 BATT RI3 3 REPLACE Rig WITH 0.82 Ne 30933 RESISTOR(EK) USE ONLY FOR AIR CELL OPERATION 52 is WITCH R. 2V ) ON VOL. CONTROL) BROWN GREEN RED t9oV +67v. CABLE CONNECTIONS 7C I TOB- BATT BATT. ! PLUGS IN ,MODEL 94BK N BLACK C19 8MFD 90 V. -RED- n BA_TT 45V-+ 671V. -GREEN -I BATTSV.+ -H-YELLOW- YELLOW

16、RIO R9 2.2 MEG. R12 82 330 RII WITH 135RE V. -8, S WITCH 220, 83 CURRENTLCUT TER - FOSITIOH. CURRENT CUTTER FULL POWER FOR PERMANENT USE ON ISST. B DISCONNECT JUNCTION Or ftBARR MROM SWITCH 94 bT 94 BK P- 84-505-4 ti 470 C18 007 AMR M21-1 Lila 4.1 CD 0 CD a Replacement Parts Insist on genuine factor

17、y -tested parts, which are readily identified and may be purchased from authorized dealers. Yf Si. 1.9 STOCK No. DESCRIPTION STOCK No. DESCRIPTION 30954 30949 12723 30904 12724 13003 5148 14393 4870 30899 13810 30950 30895 30945 30877 30905 30951 30701 14635 30955 14074 14561 30538 5029 12199 11172

18、30963 12679 30962 14887 RECEIVER ASSEMBLIES Cable-Battery cable complete Capacitor -56 Mmfd. (C9) Capacitor -56 Mmfd. (C4) Capacitor -100 Mmfd. (C8, C11, C12) Capacitor -120 Mmfd. (C16) Capacitor -180 Mmfd. (C13) Capacitor-.007 Mfd. (C18) Capacitor-.01 Mfd. (C14, C17) Capacitr-.025 Mfd. (C15) Capaci

19、tor -0.1 Mfd. (Cl, C10) Capacitor -8 Mfd. (C19) Coil-Antenna coil (L1, L2) Coil-Oscillator coil (L3, L4) Condenser -2 - gang variable tuning condenser (C2, C3, C5, C6, C7) Cord-Drive cord Core-Adjustable core for I.F transformers. Dial-Dial scale and dial scale holder and bracket assembly Drum-Tunin

20、g condenser drive cord drum with set screw Indicator-Station selector indicator pointer. Resistor -0.82 ohm, flexible type (R13) Resistor -82 ohms, watt (R9) Resistor -220 ohms, watt (R11) Resistor -330 ohms, watt (R12) Resistor -56,000 ohms, watt (Rl) Resistor -270,000 ohms, watt .(R7) Resistor -47

21、0,000 ohms, watt (R8) - . . Resistor -820,000 ohms, watt (R6) Resistor -2.2 meg., J. watt (R2, R10) Resistor-B.2 meg., watt (R3) Retainer-Retainer for knob shaft 30952 3682 11196 30956 14191 30953 30948 30903 30947 30970 30969 30971 30973 30972 30974 30975 14269 12827 30935 30308 30467 14270 Shaft-S

22、tation selector knob shaft Shield-Radiotron shield Socket-Radiotron socket Socket-Speaker socket Spring-Drive cord tension spring Switch-Current-cutter switch (S3). Transformer-First I.F. (L5, L6, CS, C9). - Transformer-Second I.F. (L7, LB, C11, C12) . Volume control and on -off switch (R5, SI, S2)

23、REPRODUCER ASSEMBLIES Model 94BT (Speaker 84226-1) Cone-Reproducer cone and voice coil (L9). Reproducer complete Transformer-Output transformer (T1) Model 94BK (Speaker 84145-2) Cone-Reproducer cone and voice coil (L9) Reproducer complete Transformer-Output transformer (Ti.) MISCELLANEOUS ASSEMBLIES

24、 Crystal-Station selector celluloid crystal Knob-Station selector or volume control knob Plug -3 -contact male plug for battery cable- 94BK only Resistor -2.2 ohms, flexible type to replace Stock No. 30955 when using 3 -volt battery. - Screw-Chassik mounting screw and washer- 94BT only-Package of 4 Screw-Chassis mounting screw and washer- 94BK only-Package of 4 Spring-Retaining spring for knob 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN