RCA-Victor-Co-Inc-85BT 电路原理图.pdf

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1、PAGE 319-B MODELS 85BK 8. 85BT Five -Tube, Three -Band, Battery Operated, Superheterodyne Receivers CII OSC. RNTC.7 RI 20,000 RC6000/5.C. 470 MPAR 470000s. v C. BATT. OUTPUT 4 C/PiVE /z a.oe Rvc It CH OSCCIS 05C. L10 OSC. * *p rma.6.10ve00KC .orour eOoKCo. le 10 W.1I5. Cor., LIZ SEC. RCLI. 45,015C.

2、TO L I 4 StC ROJ. 4G,OK.C. SN-719 -Radiotron, Coil, and Trimmer Locations Model 85BT Electrical Specifications FREQUENCY RANGES Standard Broadcast (A)530-1,720 kc Medium Wave (B)2,100-6,800 kc Short Wave (C)6,800-22,000 kc Intermediate Frequency RADIOTRON COMPLEMENT (1) RCA -1C6First Detector-Oscill

3、ator RCA -1A4Intermediate Amplifier Pilot Lamps (2) BATTERIES REQUIRED Model 85BK R -F ALIGNMENT FREQUENCIES Short Wave (C) 20,000 kc (osc.) Medium Wave (B)6,000 kc (osc., ant.) Standard Broadcast (A). 600 kc (osc.), 1,500 kc (osc.) 460 kc (3) RCA -1F6Second Det., A -F Amp., and A.V.C. (4) RCA -30Au

4、dio Driver (5) RCA -19Push -Pull Power Output Mazda 2.0 volts, .06 ampere A, one plug-in, 21/2 -volt Air Cell, or one 2 -volt storage battery; B, three 45 -volt, heavy-duty, plug-in type B batteries; C, one 71/2 -volt C battery tapped at -11/2, -3, and -41/2 CURRENT CONSUMPTION A at 2 volts (pilot l

5、amps off) 0.56 ampere A at 2 volts (pilot lamps on) 0.68 ampere B at 135 volts 19 milliamperes Fuse Rating 1/2 ampere POWER OUTPUT Undistorted 1.2 watts Maximum 2.2 watts Bias Cells.-Three bias cells are used only for the purpose ofsupplyingbiaspotential tothe106first -detector - oscillatortube.Thes

6、ecells shouldneverbemeasured with an ordinary voltmeter or other device which draws any current.A simple check on these cells may be made by connecting a milliammeter inthe platecircuit of the 106 tube andnotingtheplatecurrent reading.Then carefully remove the cells and substitute a battery potentia

7、l of 2.7 volts in their place and note the new reading on the milliammeter.If the first reading obtained (with bias cells) is more than 40% from the latter reading (with 2.7 -volt battery), the bias cells should be replaced. This 40% dif- ferenceisequivalent toa change of approximately 25% battery v

8、oltage. Operation With CV -8 Pak-O-Powr.-These receivers may readily be operated from anRCA CV -8 Pak-O-Powr, in which case,asix -volt storage battery replaces the A and B batterieslistedunderBatteriesrequired. When using the CV -8, one cell (2 volts) of the storage battery supplies filament voltage

9、tothetubes,while the other two cells (4 volts)supplies power for the CV -8. When installing, the seven prong CV -8 receptacle plugs into the seven prong volts, and three bias cells (Stock No. 12681). LOUDSPEAKER Type Permanent -Magnet Dynamic Voice Coil Impedance2.2 ohms at 400 cycles plug on the re

10、ar apron of the receiver chassis and the four battery leadsclip on terminals of the storage battery as follows: Red tot 6 V.; Blue to + 4 V.; Yellow to + 4 V.; and brown (fused lead) to -V. The two four -volt leads (Blue and Yellow)should make separateconnections to the same battery strap to avoid v

11、ibrator buzz which might otherwise resultifthese two leads are joined together or touch each other.Observe extreme care that proper con- nections are made to the battery, as a wrong connection will burn out the tubes.The green lead (originally connected to - 3 v. on the C battery) should be shifted

12、to the - 4.5 volttap.TheotherCbatteryconnectionsremain unchanged. The following changes underElectricalspecifications become effective when employing the CV -8; A battery currentdrainat6volts,1.65amperes.Fuserating,5 amperes.Undistorted output, 1.3 watts.Maximum output, 1.8watts.Under Service data,

13、the following voltages apply to the RCA -19 power -output tube.Either plate to chassis,180volts.Eithergrid tochassis, - 41/2volts. Plate current (either plate), 1.6 ma. When servicing,the CV -8chassis should be insulated from the receiver chassis to avoid vibrator buzz. RCA VICTOR DIVISION OF RADIO

14、CORPORATION OF AMERICA, CAMDEN N. J., U. S. A. 收音机爱 好者资料库 RadioFans.CN GO OR RANGE SELECTOR SHOWN IN -C- BAND POSIT ON. FOR -13SANDS ROTATE KNOB COUNTER CLOCKWISE LI 1.94555 MME _LL7MMF C4C7 -490 MMFT C5 170 MME 3-20 vonAB 470.000E 1ST 0E7_ OSC. LIE BeNINIE C FOI 1-490 C. MIME 30 MEAF 52 -SO WAR - t

15、iCI5 5-_SQ MN, IIIMOVABLE SEGMENTS (ROTOR) 1.9 MP - TT R2 56E0001 ID 0.1 I V SWITCH PROGRESSES IN THIS DIRECTION 03R4 AMP,MAW 1200A3300A. ANT COIL CONNECTIONS L.2 1M1id 21 ( 21- 110MF LET IR4 -2.7V R5 22002. LINE CLOSED FOR RADIO LIT L14 R7 2.2 MEG. 23 21-1090 ROIL 2.DET RVC AE- IF6 E 120 2, RD 22 0

16、00 E29 180 AWE 02549 0025T RDvOLUME 2MEG CONTROL RB 220000 C281 0.11450I 0035 MED DRIVER 50 CEO ,20 OP1 NAME RII 270 000 RIO IMEG. CI9 151AF-13. OSCCOIL CONNECTIONS -Schematic Circuit Diagram PRI AMAMI CEI M POT TOR TOP 1. I.F. TRANSF CONNECTIONS RGC22 EEE004 11201.4r DOI FU3L.6 2/02102).l In yOP Ro

17、y TORE rLFTRANSF. CONNECTIONS 7.5V 531 OUTPUT TI 19 T2 Efe 130 n)10F25 OE RE WHEN PAR -0 PoNR- IS USED CONNECT THIS LEAD TO -At VOLT TERMINAL 0.43E USED ONLY FOR- +26. RIR CELL OPERRTION GA, C3E BMFD. 6300 -01 33 0025 C3I .035 MED. FUNCTIONS IN CIRCUIT ONLv WREN PAR -0 PORK IS USED RI 2.2A -DIAL LRA

18、APS DIAL LAMP 53 J SWITCH (ON RANGE SELECTOR SHAFT) POWERMOUNTED ON SWITCHSAME SHAFT pow ER PLUG CONNECTIONS 7 05 RMP FUSE F I +452-900. BRTT. eL AEAYILLOR ! ,r PL- , Aryto, or YE ELIRE.1.1 411 93. BRTT. facmiTVIEW Of OAT TIE KY PLUG 1 BATTERY CONNECTIONS A FOR AIR CELL ORE RTIOni iNSHAT0-03 4,65 TE

19、A (R 11 foSE. OESWITH PoSlrivE (RA. F I35V 3-00186-0 TONE CONTROL SWiTIN 6 3 DRIVER TRANS. CONNECTIONS -YELLOW TI BLVE- 3740 - GREEN -Rao 2,)0. 3144 LUE-ELL UTE - SLUE - AL E - 0 IA n. REOALRE If - OUTPUT TRANS. CONNECTIONS TREBLE BASS CO Ul T CJ 90 co co 收音机爱 好者资料库 RadioFans.CN PAGE 321-B 85BK - 1S

20、T DET.- i 07.1.1 C.G. 0062V -,1,_ L _ _ - 135V - Z wad-rLL13 AC/J 4130 K.C. 2N I.F. TRANS. C.G OSC. COI L 2 DET, A.F. C._ 1 F6-I 2V. (ap v.) 0V. 35V.925V. t29V.it ANT. COIL DRIVER 302V.7 133V. ttt 1 BOTTOM VIEW- REAR OF CHASSIS PLATE CURRENT N* -11.0 Ma. N.1 OP 311T1A. N.24.1 Ma. No4 3.5MB. 14S RORP

21、f_. 1.2 ma. OUTPUT 19 r- SP- n-Sar I134V. -Radiotron Socket Voltages, Coil, and Trimmer Locations Measured with all batteries at normal voltage-Tuned to approximately 1,000 kc- No signal being received-Volume control minimum *CAUTION: Do not attempt to measure voltage on control grid of the 106 with

22、 any conventional voltmeter due to presence of bias cells. Note: Two voltage values are shown for some read- ings.The higher value shown in parenthesis with as- terisk(*)indicates operating conditions without volt- meter loading. Alignment Procedure Calibrate the tuning dial by adjusting main dial p

23、ointer to the low -frequency (end) calibration mark on dial with the gangtuning -condenserplatesinfull -meshposition;then adjustthesmall(vernier)pointertoO.Theseare friction adjustments. M- 81 8 1G-0 Order of Alignment Test Oscillator Receiver Dial Setting Circuit to Adjust Adjustment Symbols Adjust

24、 to Obtain Connection to Receiver Dummy Antenna Frequency Setting 1 1A4 I -F Grid Cap .001 Mfd.460 kc No Signal 550-750 kc 2nd I -F Trans. L13 ITN. .-1,C.G. 1 G :1 -1 74V.; 1; ,1 6.3V._i 1- (.1.3e) ,L A.C.r -4-01Y. I 1 -0.2V. I 11 9II 1 r FRI. ADJ. 85T2 VOLTAGES 5% HIGHER -Radiotron Socket Voltages,

25、 Coil, and Trimmer Locations Measured at 115 volts, 60 -cycle supply-Tuned to approximately 1,000 kc (Broadcast)- No signal being received-Volume control minimum Note: Two voltage values are shown forsome read- ings. The value shown in parentheses with asterisk () indicates operating conditions with

26、out voltmeter loading. MODEL 85T2 Model 85T2 is an upright table model employing a chassis similar to Model 85T. Either of two loudspeakers may be employed and are readily iden- tified by the numbers stamped on them -84128-1 or 84128-2. The speaker cable connects to the chassis as follows: Brown lea

27、d (L11) to F terminal of tube No. 5, RCA -80, to which the red lead from the capacitor pack connects.Black- brdwn lead (L1 -T2) to SG terminal of tube No. 4, RCA -41. Black lead (T2) to P terminal of tube No. 4, RCA -41. MOTTOMla. 14I I CONNECTIONS TRANS. CONNECTIONS SLACK a210/. CAP. PACK CONNECTIO

28、NS .?Tp.ort IOLA( M./ .TIRANE, CONNECTIONS PAGE 335-B 85T 8t 85T2 Resistance values for speaker 84128-1 are: Field coil(L11), 1,300 ohms; Voice coil (L9), 2.3 ohms; Hum neut. coil (L10), 0.15 ohm; Output trans- former (T2) primai-y, 470 ohms -secondary, 0.35 ohm; Voice -coil impedance, 2.6 ohms at 4

29、00 cycles. Resistance values for speaker 84128-2 are: Field coil (L11), 1,300 ohms; Voice coil (L9), 4.2 ohms; Hum neut. coil (L10), 0.23 ohm; Output trans- former (T2) primary, 610 ohms -secondary, 0.5 ohm; voice -coil impedance, 5 ohms at 400 cycles. REPLACEMENT PARTS Insist on genuine Factory tes

30、ted parts, which are readily identified and may be purchased horn authorized dealers STOCK No. DESCRIPTION STOCK o. DESCRIPTION RECEIVER ASSEMBLIES14638 Shaft-Station selector knob shaft and pulley 12008Shield-First I. F. transformer shield 14663Belt-Variable condenser drive belt12408Shield-Second I

31、. F. transformer shield 14632Bracket-Dial mounting bracket11266Shield-Radiotron shield 12118Cap-Grid contact cap14668Socket-Dial lamp socket 12405Capacitor -47 Mmfd. (C10)4794Socket -4 -contact 80 Radiotron socket 14262Capacitor -110 Mmfd. (C8 C9)4786 Socket -6 -contact GDP, 41 or 75 Radiotron socke

32、t 12724Capacitor -120 Mmfd. (C7)4787Socket -7 -contact 6A7 Radiotron socket 12406Capacitor -180 Mmfd. (C11)14697Spring-Idler pulley tension spring 12635Capacitor -1,000 Mmfd. (C13)12007 Spring-Retaining spring for core, Stock No. 12006 5005Capacitor-.0035 Mfd. (C14)14376 Transformer-First I. F. tran

33、sformer (L5, L6, C8, C9) 4838Capacitor-.005 Mfd. (C16)14642Transformer-Second I. F. transformer(L7, L8, C10, 4870Capacitor-.025 Mfd. (C12)C11) 4886Capacitor-.05 Mfd. (C15)14666 Transformer-Power transformer, 105-125 volts,50-80 4841Capacitor -0.1 Mfd. (C9)cycle (T1) 12484Capacitor -0.25 Mfd. (C17)14

34、667 Transformer-Power transformer, 105-125 volts,25-60 14669Capacitor Pack-Comprising one 8-Mfd. and two 5-Mfd.cycle (T1) sections (C18, C19, C20)14668 Transformer-Power transformer, 100-125/200-250 volts, 14670Coil-Antenna .coil (L1, L2) 50-60 cycle (Ti) 14257Coil-Oscillator coil (L3, L4)14645 Volu

35、me Control and power switch (R5, Si) 14662Condenser -2 -gang variable condenser (C1, C2, C4, C5, 12008Core- CO) Adjustable core and stud for I. F. transformer REPRODUCER ASSEMBLIES 14665Dial-Station selector dial 14635Indicator-Station selector indicator pointer 14678 Cone-Reproducer cone (L9) for s

36、peaker marked 84011-3 5228Lamp-Dial lamp 14939 Cone-Reproducer cone (L9) for speaker marked 84011-6 14638Pulley-Idler pulley-less spring14675 Reproducer complete (84011-3) 14664Pulley-Variable condenser drive pulley-located on con- denser shaft 14677Transformer - Outputtransformer (T2)forspeaker mar

37、ked 84011-3 14671Resistor -33 Ohms-Carbon type, i watt (R9)14940 Transformer-Outputtransformer (T2)forspeaker 11670Resistor -330 Ohms-Carbon type, 1 watt (R10) marked 84011-6 8067Resistor -39,000 Ohms-Carbon type,watt (R9)i:35:150Field coil for speaker marked N401 15 12333Resistor -68,000 Ohms-Carbo

38、n type,watt (121) 11172Resistor -470,000 Ohms-Carbon type, i watt (R8) MISCELLANEOUS ASSEMBLIES 5035Resistor -560,000 Ohms-Carbon type, / watt (R7) 11826Resistor2.2 Megohm-Carbon type, i watt (R2, R6) 14654 Escutcheon-Station selector escutcheon and crystal 13732Resistor -10 Megohm-Carbon type, * wa

39、tt (R4) 12673 Knob-Station selector or volume control knob 5129Ring-Radiotron shield ring14287 Screw-Chassis mounting screw and washer 4389Screw-No. 6-32z3/16 headless set screw for pulley, Stock No. 14639 4119Screw-No. 8-32 : ftheadless set screw for knob, Stock No. 12673 Stock No. SUBSTITUTE PARTS

40、 - MODEL 85T2 Description 30460Belt -Flat, phosphor -bronze drive belt for indicator pointer 30469Belt -Flat, endless drive belt for tuning condenser 5119Connector-3-contact female connector for speaker cable 30459Pulley-Indicator-pointer pulley and shaft 30465Pulley-Drive-belt intermediate pulley -

41、located on side of drive opposite idler pulley 30468Pulley-Variable-condenser drive pulley -located on condenser shaft 30340Retainer-Indicator-pulley or drive -belt intermediate pulley retainer 30463Screw -No. 4-40 x 3/16 in. binder -head screw to fasten indicator drive belt 30471Cone -Reproducer co

42、ne (L9) (for Spkr. 84128-2) 30687Cone -Reproducer cone (L9) (for Spkr. 84128-1) 5118Connector-3-contact male connector (for Spkr. 84128-2) 30470Reproducer complete (Marked 84128-2) 30472Transformer -Output transformer (T2) (for Spkr. 84128-2) 30686Transformer -Output transformer (T2) (for Spkr. 84128-1) Stock Nos. 14663, 14664, 14676, 14939, 14675, 14677, and 14940 are not used in Model 85T2.