RCA-Victor-Co-Inc-85BT6 电路原理图.pdf

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1、PAGE 3 2 3-B MODEL 85BT6 Five -Tube, Two -Band, A -C / Battery -Operated, Superheterodyne Receiver esT OET 40SC. CI -ANT - 15,000 K C CE-OSC. -r 15,000sc -0 L9 I 45014 C SN-777 0 P.CA rvirG CO.,INC 2X0 OET., C23 CII,C21 3 OUTPUT 4 RECT TOP VIEW -REAR OF CHASSIS/O Cr- OSC._,-10 POWER SUPPLY f Coa 600

2、KC- CONNECTOR- BOTTOM -Radiotron andTrimmer Locations Electrical SpeciAcations FREQUENCY RANGES Broadcast (A) 540.1,720 Short Wave (C) 5,800.18,000 Intermediate Frequency Model 85BT6 R -F ALIGNMENT FREQUENCIES kcShort Wave (C)15,000 kc (osc., ant.) kcBroadcast (A)600 kc(osc.), 1,500 kc (osc.) 460 kc

3、 RADIOTRON COMPLEMENT (1) RCA -6A8 -G First Detector-Oscillator (2) RCA -6K7 -G Intermediate Amplifier (3) RCA -6Q7 -G. Second Det , A -F Amp. and A.V.C. (4) RCA -6K6 -GAudio Power Amplifier (5) RCA -5Y3 -GFull -Wave Rectifier Pilot Lamp (1) Mazda No. 40, 6.3 volts, 0.15 ampere POWER SUPPLY RATINGS

4、Rating A 105.125 volts, 50.60 cycles, 45 watts Storage Battery 6 volts, 2.95 amperes Fuse Rating (Vibrator) 5 amperes POWER OUTPUT BATTERY POWER Undistorted0.85 watt Mazimuin1.5watts A -C POWERLOUDSPEAKER 1.2 wattsType6 -inch Permanent -magnet Dynamic 2.0 wattsVoice coil impedance2.6 ohms at 400 cyc

5、les 19W. OUTPUT 6KGG -182 V. - RECT. 5Y 3G _210V. A.C.0 210V. 202V. 1A.C. 5V. A.C. OV _J 6.4V. A.C. IOV. 11 V.19IV. Csl ELECT. CAP. ELECT. CAP C24 202V. CIICif Cal ;C23 er# C23 2- 6 Q7 G 6.4V. G. A.C. (00 NOT MEASURE SEE TEXT) (eay.*) 57V, OV.) -0.IV. i II BOTTOM VIEW -REAR OF CHASSIS C26 A- 0 SC. 1

6、,500K C CATHODE CURRENTS 5.9 MS N. 25.4 ma N 30.3 ma. N. 424ms N.5.36 may a CANNOT BE MEASURED AT SOCKET I.6V,- OV. - - -C.G. 6.4V.F A.C.-191V.- 60- - osc-a v.- - 6AEIGL_ 1ST.I. F.TRANS. LB PRI. ADJ. -0 460 KC I F 6K7G 8145 CELL CI8 560 FAME R9 410,000A 270,000rt R8 4-10IL C22 .01 MFD. C21 10 1,4F0

7、RED 18.5 cc T GREEN -1. O p GRETNI BROVVNI 950 - BROWN - BLACK BROWN RECT. 51.3G P1 BLUE BLUE 54 7 3 A.C. 6 YEL LO P2 111 L13277- C24 8M FO. 10 HEATERS 4 DIAL LAMP -YELLOW C23 MED. R10 2.2 MEG JUMPERCONNECTOR IN A.C.PLUGSOCKET TERMINALS I T2 CO (.1 LI 2. / 1 co ( 315 R14 R5 RIO C20 - GREEN -YELLOW O

8、r -or- BLUE RED L_ _J CAUTION.-Disconnect plug from a -c power source, or batteryclips from storage battery, before attaching either cable -connector to the male connector on the rear of the chassis. VIBRATOR POWER -SUPPLY UNIT 5 AMP 1 FUSE C7 560 MME 0 LI_3A77 -Schematic Circuit Diagram BROWN Cl 0.

9、25 025 C6-560,4NIE RR; 0351110W GREEN, BROWN BLACK C5 PLUG CONNECTION ,RED 2 10E01,0E0 ITO BASE VOIR BLACK 0.1 INFO WRITE 3 BEAco, 4 RED-%ROWN 5 REAR VIEW OF PLUG 0 0 7 DUMMY TERM GOT TOM VIEW OF VIBRATOR SOCKET 0 G-) 01 收音机爱 好者资料库 RadioFans.CN PAGE 3 2 5-B Precautionary Lead Dress.-(1) Dress brown

10、twisted leads to power switch away from bias cell and a -f leads to volume control.(2)Dress light -blue lead, connected from 6A8 -G socket to oscillator coil, away from all other leads and chassis. (3) Dress 6A8 -G grid -cap lead (R12) to prevent shorts and keep flexible. (4) Dress all leads to ante

11、nna coil away from trimming capacitor C26 and from bus lead, connected from oscillator coilto gang condenser.(5) Dress blue antenna lead through the loop of C4 which is mounted on end of antenna coil. Do not change length of the following leads: (6) C9 to chassis; (7) Blue lead from L3 to range sele

12、ctor; (8) Bus lead from oscillator coil to gang condenser. Keep the following as short as possible: (9) Leads to C26; (10) Bus lead from oscillatqr coil to range selector.In the vibrator power -supply unit: (11) Dress small leads from transformer to vibrator socket terminals 3 and 4 close to base an

13、d twist twice. (12) Twist large leads from transformer to vibrator socket terminals 2 and 5. (13) Dress C2 as near to bottom cover as possible. Bias Cell.-The bias cell is used only for the purpose of supplying bias potential to the triode section of the 6Q7 -G tube. This cell should never be measur

14、ed with an ordinary voltmeter, or other device, which draws any current. A simple check on this cell may be made by temporarily shunt, ing the: 270,000 -ohm plate resistor R7 (mounted on 6Q7 -G socket) with a 20,000 -ohm resistor, connecting a milliam- meter in the plate circuit of the 6Q7 -G tube,

15、and noting the plate current reading. Then carefully remove the bias cell and substitute a battery potential of 0.9 -volt in its place and note the new reading of the milliammeter. If the first reading obtained (with bias cell) differs from the latter reading (with 0.9 -volt battery supply) by more

16、than 20% of the latter reading,thebiascellshould be replaced.This 20% is equivalent to a change of approximately 25% battery voltage. 85BT6 Alignment Procedure Calibrate the tuning dial by adjusting dial pointer to the center horizontal line with the gang tuning -condenser plates in full -mesh posit

17、ion.This is a screw -driver adjustment. STEP COMNECT MICE SIDE OF TEST OSC. TO - TUNE TEST OSC TO - TURN RADIO DIAL TO ADJUST THE FOLLOWING FOR MAX. OUTPUT 1 I-F Grid In series with 0.01 mf1 460 Kc Quiet point near 600 Kc itAl Band L10 2nd I-F Trans. 2 1st Det. Grid in series with 0.0 imrd L9L8 1st

18、I-F Trans. 3 Antenna in series with 300 ohms 15000 Kc 15000 Kc C Band , fClA Osc.Ant. 4 Antenna In series with 200 ramfd 1500 Kc 1500 Kc A Band C26H-F Osc. 5600 Kc 600 Kc A Band L7L-F Osc. ROCK GANG 6 Repeat Step 4 Osc. tracks 460 Xc below signal 460 Xc above on A Band. Use maxim capacity peak. Use

19、minimum capacity peak - ROCK GANG. on CBand and REPLACEMENT PARTS Insist on genuine Factory tested parts which are readily identified and may be purchased from authorized dealers. STOCK No. DESCRIPTION STOCK No. DESCRIPTION RECEIVER ASSEMBLIES12879Resistor -2.2 megohms, insulated, X watt (R6, R10) 6

20、129Ring-Radiotron shield ring 14634Belt-Variable condenser drive belt4389Screw-No. 6-32 x 3/16 -inch headless set -screw for drive 14632Bracket-Dial mounting bracketpulley, Stock No. 14639 5237Bushing-Variable condenser rubber mounting bushing14638Shaft-Station selector knob shaft and pulley 11350Ca

21、p-Grid contact cap5037Shield-Radiotron shield 30661Capacitor-Adjustable trimmer (3-30 Mmfd.) (C26)14658Socket-Dial lamp socket 14392Capacitor -4.7 Mmfd. (C4)11196Socket-Radiotron socket 12405Capacitor -47 Mmfd. (C1.5)14837Spring-Idler pulley tension spring 14282Capacitor -110 Mmfd. (C12, C13)30655Sw

22、itch-Range switch (S1, S2, S3) 12724Capacitor -120 Mmfd. (C8)14376Transformer-First I.F. transformer (L8, L9, C12, C13) 12812Capacitor -450 Mmfd. (C9)14842Transformer-Second I.F. transformer (L10, L11, C15, 13699Capacitor -470 Mmfd. (C17)C17) 12537Capacitor -560 Mmfd. (C18)30856Transformer-Power tra

23、nsformer,105-125 volts,50-80 12728Capacitor -4,500 Mmfd. (C3)cycles (T1) 14393Capacitor-.01 Mfd. (C10, C19, C2C, C22) 30658Volume control and power switch (R25, S4) 4839Capacitor -0.1 Mfd. (C5, C14, C25) 11203Capacitor -8 Mfd. (C11) REPRODUCER ASSEMBLIES 30657Capacitor Pack-Comprising two sections e

24、ach 8 Mfd. and one section 10 Mfd. (C21, C23, C24) (84140-1) 12681Cell-Bias cell 30864Cone-Reproducer cone and voice coil mounted and cen- 4358Clamp-Capacitor pack mounting clamp for Stock No. tered in metal housing (L12) 30857 30662Reproducer, complete 30859Coil-Antenna coil (Li, L2, L3, L4) 30663T

25、ransformer-Output transformer (T2) 14647Coil-Oscillator coil (L5, L8, L7) 14633Condenser -2 -gang variable tuning condenser (C1, C2, C6, C7) VIBRATOR POWER UNIT ASSEMBLIES 14631Dial-Station selector dial and holder14724Capacitor -560 Mmfd. (C7, C8) 14851Drive-Variable condenser vernier drive and pin

26、ion gear11654Capacitor-.01 Mfd. (C3, C4) 30860Holder-Bias cell holder4839Capacitor -0.1 Mfd. (C5, C8) 14835Indicator-Station selector indicator pointer12484Capacitor -0.25 Mid. (C1, C2) 4340Lamp-Dial lamp 14289Clip-Battery clips for vibrator battery cable 14404Plug -7 -contact male plug for rear apr

27、on of chassis12179Coil-Choke coil (L1, L3) 14838Pulley-Idler pulley-less spring12819Coil-Choke coil and terminal board assembly (L4) 14839Pulley-Variable condenser drive pulley-located on con-5140Fuse -5 -amp. (F1) denser shaft 13220Resistor -56 ohms, carbon type,1. watt (R1, R2) 12818Reactor-Filter

28、 reactor (L13)30667Socket -7 -contact female socket for vibrator to chassis 14653Resistor -60 ohms, flexible type (R12)power cable 13454Resistor -270 ohms, carbon type, i. watt (R13)30685Transformer-Vibrator power transformer (T1) 30499Resistor -470 oluits, insulated, i watt (R8)30866Vibrator (L5) 6

29、175Resistor -5,600 ohms, carbon type, I watt (R11) 12265Resistor -6,800 ohms, insulated, X watt (R3)MISCELLANEOUS ASSEMBLIES 13998Resistor -22,000 ohms, insulated, 1 watt (R14) 14664Escutcheon-Station selector escutcheon and crystal 8072Resistor -33,000 ohms, carbon type, 4 watt (R4) 30668Cord-A.C.

30、power cord and plug for 110 -volt operation 12454Resistor -33,000 ohms, insulated, X watt (R2) 12673Knob-Station selector, range switch, or volume control 12199Resistor -270,000 ohms, insulated, i. watt (R7) knob 13733Resistor -330,000 ohms, carbon type, 1. watt (R1) 4119Screw-No. 8-32 a *-inch headless cup -pointed set -screw 12285 Resistor -470,000 ohms, insulated, X watt (R9)for knob, Stock No. 12873 收音机爱 好者资料库 RadioFans.CN