RCA-Victor-Co-Inc-94BT6 电路原理图.pdf

《RCA-Victor-Co-Inc-94BT6 电路原理图.pdf》由会员分享，可在线阅读，更多相关《RCA-Victor-Co-Inc-94BT6 电路原理图.pdf（5页珍藏版）》请在收音机爱好者资料库上搜索。

1、p L 586-C 94884 SERIES Alignment Procedure 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, keep the output as low as possible to avoid a -v -c action. Pre-setting

2、Dial.-With gang condenser in full mesh, the pointer should be horizontal. Precautionary Lead Dress. - 1. Dress speaker leads down to chassis. 2. The green lead from the loop to the antenna section of the gang should be dressed between the output and detector tube shields and pulled toward the far co

3、rner of the loop by means of the rubber band. 3, The spiral shield on the 1st -A.F. grid lead should he brought as close as possible to the grid cap. 4. Leads to the high side and tap of the volume control should he dressed down to the chassis and away from the output tube plate lead. Antenna.-An an

4、tenna and ground may he connected to A and G at bottom of cabinet. If total length of antenna and lead-in is more than t i0 feet, connect a 300 mini capacitor in series with lead-in. A ONE -TURN ANTENNA -COUPLING COILLOOP YELLOW CI 2.10 MMF. C2 1a430 MMF. c9 I A7 -G ISTDET. e,oo I1a z 1 1 I.Sa, OSC.

5、 TRANS. CB = .01 MFD. Note: Values with star (*) are operating voltages. Values not starred are actual measured voltages. Measurements are made to chassis unless otherwise indicated, with set tuned to quiet point. Values should hold within approximately 20% with rated battery voltage. Headphone Atta

6、chments: A jack for headphone operation can be in- stalled quickly and easily without removing the chassis. The method outlinea oelow permits operation with either headphones or loudspeaker, or both together. The set and loudspeaker func- tion in the normal manner when the headphones are not plugged

7、 in the jack. When the plug is inserted part way in the jack, the loudspeaker and headphones both operate. Pushing the plug all the way into the jack disconnects the loud- speaker but leaves the headphones in operation. (A 2.2 ohm resistor is automatically connected as a dummy voice -coil load when

8、the plug is inserted all the way.) MATERIAL REQUIRED: Stock No. Description (1) 12128 Jack-Telephone jack (1) 80935 Resistor -2.2 ohm flexible type (1) 4838 Capacitor-.005 mfd. Also one pair of radio headphones of standard 2,000 -ohm or 3,000 -ohm type (d -c resist- ance) complete with plug. 1N5 -G

9、I.F.AMPL. C4 2 56 MMF. 111:8 JACK F CS SG si MMF. 30935 77, 463A Steps Connect the high side of test- oscillator to- Tune test-osc. to- Turn radio dial to- Adjust the follow - ing for max. peak output - 1 1N5 -G grid cap, in series with .001 mfd. 455 kc Quiet point between 550-750 kc L5 and L6 (2nd

10、I -F transformer) 2 1A7 -G grid cap, in series with .001 mid. 455 kc L3 and L4 (1st I -F transformer) 3 Assemble chassis and batteries in correct pdsition in cabi- net, and fasten rear cover (loop) in place while making the following adjustments, which are accessible through holes in the bottom of t

11、he cabinet. 4 Antenna terminal, in series with 200 mfd. Connect low side of test- osc. to G term. 1500 kc 1500 kc* C17 (osc.) Cl (ant.) 5 600 kc 600 kc* L2 (osc.) Rock in 6 Repeat steps 4 and 5. * Use bottom of 1 in 150 for 1500 kc calibration point, and use center of 0 in 60 for G00 kc calibration

12、point. 2 I . F. TRANS, Io, 35C4, R3 R3 - 10 MEG. R4 3.4MEG. 1 1YtV. A BATTERY 1H 5-6 2 D D ET., A. F. (2) Tuning Maximum 0.7 watts Tuning Drive Ratio 8 to 1 Alignment Procedure Cathode-ray Alignment is the preferable method. Connections for the oscillograph are shown in the chassis drawing. Output M

13、eter 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 keep this output as low as possible to avoid a -v

14、 -c action. For additional details, refer to booklet RCA. Victor Receiver Alignment. Pro -setting Dial.-With gang condenser in full mesh, the pointer should be horizontal. Steps Connect the high side of test-oscil- lator to- Tune test-osc. to- Turn radio dial to- Adjust the follow - ing for max. pea

15、k output No. 1 6K7 -G I -F grid cap, in series with .001 mid. 455 kc Quiet point between 550-750 kc L7 and L8 (2nd I -F transformer) No. 2 6A8 -G 1st-det. grid cap, in series with .001 infd. 455 kc L5 and L6 (1st I -F transformer) No. 3 Antenna lead, in series with 200 mmfd. 1,500 kc 1,500 kc C5* (o

16、scillator) C2 (antenna) * Adjust C6 on gang condenser to one complete turn from tight, before adjusting C5. Replacement Parts Insist on genuine factory -tested parts, which are readily identified end may be purchased horn authorized dealers. STOCK DESCRIPTION STOCK N DESCRIPTION RECEIVER ASSEMBLIES

17、11353 Resistor -680 ohms, watt (R10) 5175 Resistor -6,600 ohms, watt (R17) 30959 Cable-Battery 12759 Resistor -15,000 ohms, watt (R3) cable complete Cable-Shielded volume control cable 30967 14284 Resistor -22,000 ohms, 1/10 watt (R15) 12723 Capacitor -56 Mmfd. (C8) 5029 Resistor -58,000 ohms, watt

18、(RI) 30904 Capacitor -100 Mmfd. (C9, C10, C12, C13). 11172 Resistor -470,000 ohms, watt (R7, Rll) 12724 Capacitor -120 Mmfd. (C17) 12879 Resistor -2.2 meg., 3 watt (R4, R6) 13003 Capacitor -180 Mmfd. (C14) 30271 Resistor -4.7 meg., watt (R2) 30984 Capacitor -330 Mmfd. (C4) 14887 Retainer-Retainer fo

19、r knob shaft 30986 Capacitor -1,000 Mmfd. (C22) 30952 Shaft-Station selector knob shaft 14393 Capacitor-.01 Mfd. (C15, C18, C19) 3682 Shield-Radiotron shield . 4937 Capacitor-.01 Mfd. (C27) 11198 Socket-Radiotron socket 4886 Capacitor-.05 Mfd. (C11) 30958 Socket-Speaker socket 4839 Capacitor -0.1 Mf

20、d. (C18) 14312 Socket-Vibrator socket 30899 Capacitor -0.1 Mfd. (Cl) 14191 Spring-Drive cord tension spring 30965 Capacitor -0.25 Mfd. (C20) 30957 Transformer-First I.F. transformer (L5, L6, 30961 Capacitor-Comprising 2 sections each 18 Mfd. C9, C10) (C23, C24) 30903 Transformer-Second I.F. transfor

21、mer (L7, LS, 30968 Coil-A filter choke coil (L10) C12, C13) 30950 Coil-Antenna coil (Ll, L2) 30960 Transformer -Vibrator transformer (Ti, C21, 30895 Coil-Oscillator coil (L3, L4) L11) 30945 Condenser -2 -gang variable tuning condenser 14309 Vibrator-Plug in vibrator (L12) (CZ C3, C5, C6, C7) 30958 V

22、olume control and on -off switch (R5, Si). 30877 Cord-Drive cord 30905 Core-Adjustable core for I.F. transformers REPRODUCER ASSEMBLIES (Speaker 84226-1) 14289 Clips-Battery clips -1 marked + and 1 un- marked 30970 Cone-Reproducer tone and voice coil (L9) . 30951 Dial-Dial scale and dial scale holde

23、r and bracket 30969 Reproducer complete assembly 30971 Transformer-Output transformer (T2) 30701 Drum-Tuning condenser drive cord drum with set screw MISCELLANEOUS ASSEMBLIES 5140 Fuse-Battery cable fuse (Fl) 14635 Indicator-Station selector indicator pointer 30975 Crystal-Station selector celluloid

24、 crystal 13220 Resistor -58 ohms, watt (R16) 14269 Knob-Station selector or volume control knob. 14074 Resistor -82 ohms, watt (R9) 30308 Screw-Chassis mounting screw and washer - 30498 Resistor -390 ohms, watt (R18) Package of 4 30681 Resistor -470 ohms, 1 watt (R12) 14270 Spring-Retaining spring f

25、or knob . . . - - a a . . _ . 8 11, 收音机爱 好者资料库 RadioFans.CN PAGE 588-C 94BT6 Precautionary Lead Dress 1. Leads on C16 and C20, and lead from R16 to terminal board, must be short. C22 and C4 are soldered direst (no leads). 2. Dress L10 away from chassis. Dress T1 secondary leads (brown and green) awa

26、y from base and free of other leads (same applies to R17 and C27). Dress T1 secondary midtap (brown - black) free of other leads and close to chassis. 3. Maintain original ground points. 4. Antenna and ground leads 36 inches long, twisted, and ar- ranged as shown in top view. 5. I.F. plate lead (blu

27、e) dressed close to and along edge of chassis. Battery Charger Connections.-The positive side of the 6 -volt A circuit is connected to the receiver chassis, and the chassis is nor- mally grounded. If the charger has a ground on the negative side, the ground should be removed, or changed to the posit

28、ive side. Do not change the length of leads from the receiver to the battery. TERM. eRD. 2 VOLUME CONTROL BATT. S W ITC H IIIIIIIIII L13 C20 Ill GANG COND. -3.75V. C2(NT.VTARaM.or,1 (-1.537 k, Cs(Ro ConRio CATHODE RAT O5CILLO6RAPR CONNECTIONS VERTICALHI TO THIS TERM. VERTICAL 0 TO CHASSIS CATHODE CU

29、RRENTS (II. 9.6 MA 131 D17M.A (21 9.2 MA 141 13.2 M,A BATTERY DRAIN 6.0 V., 2.8 AMPS. VIBRATOR R 4BT-A cArc co mc e4tu- C3(03C .TO.H.onT01Q C7(08eNC144 _G6 BLUE, GREEN uHSCREW C6 ONE e. LYT TURN FROM MOOT BEFORE AD.71./5TIM6 Cs 4 6A8 -G - P pET Q OSC. SPEAKER SOCKET D 43V. 37V 6K6-0 OUTPUT oi OSC CO

30、IL 143V. 0 0 LS PRI.ADS 455 N C. -143V. II; I.F TRANS. I - cG (-1.33V)I 6 6K7 -G I. F. 6Q7 -G 2. PET.-A.F.A AkC TRANS. BOTTOM VIEW - REAR OF CHASSIS Figure 2-Radiotron Socket Voltages, and Location of Parts Measurements made to chassis unless otherwise indicated. Measurements made with set tuned to

31、quiet point, volume control at minimum, using 1,000ohm-pervolt meter, having ranges of 10, 50, and 250 volts. (Use the nearest range above the specified measured voltage.) BLUE L 61n L2 /4.BA ANT. COI L BLACK TO ENT. ONO. C2 C3 10-388 MMF. .- T URNS CI 0.3 MFD. C5 2-10 MMF C6 2-10 MMF. 1 6A8 -G 15T

32、DET.$OSC. loo MME. CB 56 R1 MMF. 56,OOOn L31 .4 P -B4211-3 941376 BROWN FL 5 A.FUSE C4 330 MMF. R2 4. 7 MEG. L13 + 6V. BATT. Si (on VOL. BROWN CONTROLi 6K7 -G I. F. BOTTOM VIEW OF TUBE SOCKETS 2 I.F. C13 TRANS. 100 MMF. C12 ir 100 tp A L7 LBt 1 18n Isn 2 Ctl .05 MFD / R4 2.2MEG. /yv TO HEATERS Value

33、s should hold within approximately 20% with 6 volts A. * Note: Values with star (U) are operating voltages. Values not starred are actual measured voltages. 6K 6-G OUTPUT 6Q7 -G 2 DET., A. F., & A. V. C. R15 22.000n R7 470,000 - C14 / 180 MMF. VOL.CONTR. R5 I.CI5 O1 MFD. R 6 2.2 = MEG. YELLOW RED- r

34、 _- BLACK L10 L11 ,I .03A C2O j 0.25 MFD. I I o. C21 IMkD. I BROWN fi Aq 1O 860n BLUE I 250,000A R1 47,000 419, IC17 = Izo row F. C16 T 0.1 MFD. BR D W 11- BLACK C22 1000-r MMrm. /GREEN R12 470n T2 L9 27 Q 0.5., o C19 .01 MFO. R16 56A C2.3 CZ4 16 = 16 MFD. = MFG. C27 .01 R18 MFD. 390n R17 5600A. Figure 3-Schematic Circuit Diagram 收音机爱 好者资料库 RadioFans.CN