RCA-Victor-Co-Inc-R-93 电路原理图.pdf

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1、MODELSR-93, R -93-A, R-93-2, R -93-S,anPCIGER3-8,94. RECORD PLAYERS -1r MODEL R-93 Elie. ALEUT 5CMENIAT,C C,C6,1 tt- if(IV 3 Figure 3-firing Diagram and Equivalent Schematic Circuit Models R -93-A(lot and 2nd prod.) and R-94 Deluxe (1st prod.) MODELS R-93, R -93-A, and R-94 - VOLD= AM FIDELITY INCRE

2、ASE The pickup unit of these Duo JunioriIIt11.101.141is designed to be adaptable to great variety of receiver inputs, and to provide the best average of output and fidelity that may be obtained over such a wide range of application.On soma installations, where the ultimate in output and fidelity is

3、desired, it is possible to gain oonsiderable improve- ment in performance by installation of a Stock f9652 transformer between the Radio-Fhoup ohangeover switch and the Duo output.This transformer gives a decided stepop in voltage. and enable. the Duo volume control to be operated at a lower point s

4、o that the full benefit is derived from the tone compensation.The t9632 transformer should be connected as shown in the diagram above, and its placement shouldbesuch that it is not in an interfering magnetic field frog a power transformer, reactor, wiring or motor. All other *connections are to be m

5、ade per standard instructions. Shielding should be placed over the primary and seoondary leads if such is found neeessary.It the bias of the receiver audio input stage is affected by the transformararinding, a .06 dd. in series with the blue lead will correct the conditionsThe .green and red leads o

6、f the transformer should be taped up separately and not used. =CUBICAL VIBRATION AND HUN - *Idols R -93-A Hun produced by the drive motor of the R -93-A may occasion- ally be amplified by mechanics remonanoe of the table or radio cabinet used for supporting the instrument. Ware this condition camas

7、interferon. to proper reproduction, the motor should be carefully lubricated and adjusted in acoordanoe with Service Note instructions.A felt or sponge -rubber pad beneath the instrument will also effeotively reduce the hum.Whenever the hum is of abnormal intensity due to the combination or aecumula

8、tion of causes, such as high lime voltage, resonant support, excessive amplifier gain, and unueual low -frequency responeef the addition of a 500 -ohm, 5-eatt resistor in series with themotorcoils is recommended for the 106-125 volt, 60cyclemotors.A 600-ohn, 5 -matt resistor in series with the motor

9、 oils is recommended for the106-125volt.2.5cycle motors. MODEL R-93 (Third Production) (Walnut, Red, White, Black) The Model R93 (third production) in colors of Walnut, Red, White, or Black are similar electrically to the original R-93(first and second production) but may be identified mechanically

10、by the curved tone arm.The original Model R-93 had a straight tone arm MODEL R -93-A (First and Second Production) (Walnut) The cabinet of the Model R -93-A is similar to that of the Model R-93 Walnutfinish.Thismodel incorporates an acoustic compensated volume control, seefigure3. Model R93A (first

11、production) and Model R -93-A (second pro- duction) differ only in the pickup construction, the essential difference being in the armature centerini, spring and spring clamps. The motor differs slightly in construction and mounting details from that used in the Model 1293(second produc- tion ). MODE

12、L R-93-2 DE LUXE (Walnut) Model R93.2 Deluxe isfinished in walnut and iselec- crically identicalto Model R-93 (third production), how ever, the cabinet is larger in size and has a hinged lid which may be closed while playing the records.The turntableis 10 inches indiameter.The motor differs slightly

13、 in con- struction from that used in the Model R-93 (second produc- tion). MODEL R -93-S (Walnut) Model R9 3-S has a spring wound motor and is primarily intended foruse withbatteryreceivers. The pickup and tonearm are identicaltothose described inModel R-93 (third production). MODEL R-94 DE LUXE (Wa

14、lnut) The Model R-94 Deluxe cabinet is finished in walnut and has a hinged lid which may be closed while playing the records. Note 1.(Applies to Model R -93-S only).Itis necessary to short the0.1mfd. blocking capacitor Clin Model R -93-S(see figure 6)for casesin which the control grid dc bias, or ca

15、thode current flow, would he removed or prevented by this capacitor when the record player switch is thrown to Phono position.Cl isprovided to permit operation on battery receivers without short- ing bias batteries. etc. 2.(RecordPlayerSwitchJumpers) - Some record player switches do not have jumpers

16、 JI and J2 (see figure 3) attached. When the switch is so connected and turned to phonograph position, the voltage developed by the pickup is fed into the radio receiver through the green wire and shield, and at the same time the yellow wire is connected to shield. The jumpers J1 and J2 permit the y

17、ellow lead to kill radio by connection toshield. The jumpers should be removed where the yellow lead connects in such a position as to short bias batteries, etc. 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 PAGE 386-B R93, R93A, R93-2, R93S BALL

18、 BEARING TURNTABLE SHAFT AND BEARING C WASHER RUBBER SPACERS DAMPER ASSEMBLY -J STATOR t .00,5 AIR GAP STEEL ASHER LEATHER WASHER 1.rl CHECK FOR CLEARANCE BETWEEN ROTOR AND MOTOR BOARD OIL TURNTABLE SHAFT IFMOTOR BECOMES NOISY RUBBER SLEEVE TO REMOVE TURNTABLE ASSEMBLY- LOOSEN NUT, PUSH STOP UP OUT

19、OF SLOT AND ROTATE .50 - CORRECT POSITION OF TURNTABLE STOP WHEN ASSEMBLED. TURNTABLE n MOTOR BOARD 15N -54o I N.,1 1 ROTOR TURNTABLE STOP REMOVE BURRS FROM POLES OF STATOR MID ROTOR WITH FINE EMERY CLOTH IF HUM IS PRODUCED BY SAME. 0 RUBBER SPACER RUBBER SPACER WASHER SPACERS WASHER MOTOR SUPPORT S

20、CREW MODEL R 93Details of Motor (Second Production) PICK -IIP LI 40011. VOLUME CONTROL CI E0000s. RI OUTPUT SPRING MOTOR SPEED ADJUSTMENT (SCREW) TO DECREASE SPEED TURN CLOCKWISE 0 SHIELD RED BLUE SI YELLOW GREEN LE 1,81350-. -Schematic Circuit Diagram Model R -03-S (1st prod.) RUBBE SPEED ADJUSTMEN

21、T LOCK NUT TURN SPEED ADJUSTER .50 THE FEL WILL PROTRUDE 06WHEN ALL THE WAY IN. ADJUST GOVERNOR SO AS TO LEAVE )16 BETWEEN FELT AND DISC, THEN SECURE BY MEANS OF GOVERNOR SCREW. ADJUST SO THAT SHAFT IS FREE TO ROTATE WITHOUT ENO PLAYS REMOVE TO TAKE OFF GOVERNOR -4:;triP 41, OIL KEEP FILLED WITH / L

22、IGHT OIL TO INSURE SMOOTH OPERATION .11111111 DO NOT CHANGE THIS ADJUSTMENT P-1-8147+ -Details of Motor Model R-04 Deluxe (1st prod.) 收音机爱 好者资料库 RadioFans.CN PAGE 388-B R93, R93A, R93-2, R93S . c 2 ! 1. :. 8 c 1,1 .3 ,:. ! . . c; E 5= .C.Z ; S E. c .f: c .3 ; 7 : . 4 77: e . A g i 1.1 t -c : t IT. .

23、2. 0- AV 1 .% A. i -, 5 z o v -.;. .1 DImenalons Inehem e: 7.0 gl . C i?Ft Weights .c .-t .0 . :; A ., P, I. 105-605200Synchronous R-93WalnutThirdCurved (Manual 781,40020.00051187810 505200125 Starting) 105-605200 125 105-505200 Red 125 - Synchronous R-93WhiteThirdCurved(Manual 781,40020,00051187810

24、 105-255660 Black Starting) 125 200-5051,040 250 105-605200 125 R-93WalnutSecondStraight5 200 Synchronous (Manual781,40020,00051187810 110255- Starting) 105-255660 125 105-605218 125 105-505218 125Synchronous R-93Walnut FirstStraight (Manual781,40020,0005118784 10 105-255960 125 Starting) 200-5051,2

25、70 250 105-605160 125 R -93-AWalnut First andCurved 105- 125 505160 Synchronous 781,400 40,000 Tapped(Manual for51iii971012 105-255 420 Second Starting)Compen- 125 sation 200-50 5700 250 105-605200 125 105-505200 R-93-2 WalnutFirstCurved 125Synchronous (Manual781,40020,0005137/16134101418 105- 125 2

26、55 660 Deluxe Starting) 200-5051,040 250 78 R -93-SWalnutFirstCurved- Spring Wound Adjust- able 1,40020,000512)io101191013 105-6025100 R-94 WalnutFirst Curved 125 Governor Induction 78 Adjust-1,400 40,000 Tapped for741513491418 105-50-2570 Deluxe 12560(Self- ableCompen- 200-50-25230 Starting) sation

27、 25060 PAGE 3 8 9-B R93, R93A, R93-2, R93S replace sockets with octal type (Stock No. 31251). (b) Connect octal socketsinaccordance with socket connections onthe accompanying diagram. Note that the following circuit changes are necessary: All symbols refer to designations in 84BT Service Notes. (c)

28、Replace oscillator grid resistor (R-1) with a 220,000 ohm resistor (Stock No. 12264). (d) Replace the screen dropping resistor (R-2) with a 56,000 ohm resistor(Stock No. 12286). (e)Connect I -F screen grid to terminal F on firstI -F transformer (B+) instead of to first detector screen grid. (1)Remov

29、e R-9 and C-15; connect R-8(1 megohm) to 2nd detector plate terminal. (g)Replace output grid resistor (R-10) with a 2.2 megohm resistor (Stock No. 12679). (h) Remove R-6,all C batteryleads, and yellow lead from R-8 to R-5. (i)Connect a1 megohm resistor (Stock No. 13730) from terminal A on the first

30、I -F transformer to chassis. (j)Remove the first B battery plug and the blue lead and fuse which connect it to the negative A terminal. (k) Add a fourth wire to the battery cable, connecting to the yellow lead on the second B batteryplug,and through an 820 ohm resistor (Stock No. 14076) to chassis.

31、Thisresistor may be mounted on the terminal board formerly used for R-6. The low end of the 2.2 megohm output grid resistor should connect to the battery side of the 820 ohm resistor. (1)Remove dial lamp and brown connecting lead. (m) Insert new tubes as follows: 1A7 -G 1st detector -oscillator 1N5

32、-G I -F amplifier 1H5 -G 2nd detector, A -F, A -V -C 1C5 -G Output (n) Replace tube shields. (o) Realign according to instructions in 84BT Service Notes. (p) Make alterations on rating label andin- struction sheet to indicate the change of battery supply and tube complement. (q) Use 1.5 volt dry cel

33、l or 1.4 volt Aircell for A supply ;and two 45 volt batteries forB supply. No C batteries are required. MODIFIED84BT CHASSIS Miscellaneous Data MODELS R-93 and R -93A Replacement Pickup Mechanism No. 32205: Thispickupmechanismisavailablefor replacement on record players R-93 and R -93A. Itisidentica

34、linconstructiontoStockNo. 31100, described below, except that the magnet is chrome instead of cobalt, and the output is approximately 0.4 volts. R-93, R -93A, R-93-2, R-94, R-96, D7-7, 7U, 7U-2, U-101, U -102E, U-103 Replacement Pickup Mechanism No. 31100: Replacement Pickup Mechanism Stock No. 3110

35、0 and 32205. A service replacement pickup mechanism for the midget type tone arm can now be ob- tained by ordering Stock No. 31100-Pickup Unit,less Tone Arm. This unitis usable in the models listed above. Latest design features, including a simple and substantialcentering adjustment,areincorpo- rate

36、d in this unit. The cobalt magnet employed assuressufficientoutput(0.6voltsaverage) and correct impedance (1,400 ohms) for all of the specified applications. To adjust, loosen the screws A -A, move theneedle sothatthe armature iscentrally aligned between the pole pieces, and then re -tighten the scr

37、ews. Check to see that the armature blade is not striking the coilformandthatthecentering springis securely attached to the armature. MAGNETIC PICKUP MARKINGS Inordertosimplifytheidentificationof ?ickups and proper stock numbersfortheir .:omponents, the various pickup mechanisms to be manufactured f

38、or replacement in the future will have stampings similar to the following: PU 32205The first group of numerals in- dicates the stock number of the pickup assembly. A14295The secondgroupofnumerals gives the stock number ofthe armature. C 11732Thethirdgroupofnumerals identifiesthe stock. number of the

39、 coil. This marking systemisbeingeffectedat once on pickups No. 32205, No. 31100, No. $2228 and No. 12598. It will be continued on anyadditionalreplacementpickupstobe produced. STOCK NO. 14335 Volume Control Connections: The Stock No. 14335, volume control, as used in several models of the 1937-38 l

40、ine may have any one offour constructional arrange. ments. The differentcontrolsare,however, inter- changeable,both electricallyandmechan- ically.Terminallocationsare showninthe diagram. Terminal No.1isthe low potential end of unit; terminal No. 2is the wiper arm; terminal No. 3 is the high potentia

41、l end of the unit; and terminal No. 4 isthe tone -compen- sationtap.The illustrationsareasviewed from the front of the control. 123123 123 1Z3 Terminal Arrangement, Stock No. 14335 Volume Control. 1937-38 RECEIVERS Vernier Tuning Drives: Three typesofvernier drives(StockNo. 31641,31640,14514)wereemp

42、loyedon tuning condensers of the 6-10 tube receivers. These drives are not interchangeable and itis thereforeessential,where replacementisre- quired, to order the correct part. Identification may beestablishedbycomparisonwiththe illustrations. These drives are used on the fol- lowing models: 86E86T8

43、6K 87T 87K87X87E88K 810T810T4810K 810K1 812XU105 U-107 STOCK 31643 11100 STOCK * 30741 STOCK .14514 4=M2 0 STOCK* 31640 lernier Tuning Drives for 1937-38 Receivers. NotethatStockNo.14514 supersedes Stock No. 14364. Two typesofvernierdrives (StockNo. 31643,30741)are tobe found on Models 37K1, 87T2, 8

44、7K2 and U-106. When order- ingreplacements,thecorrect partmaybe identified by comparison with the drawings. G-8 REMOTE CONTROL Adapting G-8 Control to 1938-39 Models: The assembly of the G-8 Remote Control Unit can be revised readily, so that itis equivalent to the newer model G-8 A, and may be used

45、 with 1938-39 electric tuning receivers.Itis only necessary to voidthflatching feature ofthe push buttons,by either removing the latch plates entirely or securing them in the open position.Details of the required changes are as follows: (a) Remove contact and latch assembly from case of G-8 by takin

46、g out six screws hold- ing base. (b) Disconnect link bar between the two latch plates. (c) Grind or file off outer ends of studs holding the latch plates to support bracket. (d) Removelatchplatesanddiscard. Re- assemble control box. (e) Strip additional 5 inches of braiding from receiver end of remo

47、te cable, and shellac braid ends to prevent fraying. As an alternative for operations (b), (c), and (d),the latchplates may be securedinthe complete open position by tying the lower leverofthe latch plate nearest cable to the support bracket. POPPING INTERFERENCE ReductionofStaticDischarges, AC -DC

48、Receivers: Where AC/DC receivers are used with an external antenna whichisexposedtosteam, smoke,snow,orotherinfluencesofsimilar nature, a static accumulation may occur on the antenna andwillproduce objectionableinter- ference by discharge to ground, chassis or other nearby objects.This condition can be obviated by connecting a1 megohm resistor in parallel with the isolating capacitor which is normally usedinserieswiththe antennainput,thus maintaining the antenna at ground d -c potential at all times.