RCA-Victor-Co-Inc-RAE-84 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN PAGE 207-A MODELS R78 8. RAE84 Twelve -Tube, AC, Superheterodyne Receivers and Radio -Phonograph MODEL R78MODEL RAE 84 ELECTRICAL SPECIFICATIONS Voltage Rating 105-125 Volts Frequency Rating 50-60 Cycles Power Consumption -R 78

2、- 110 Watts Average (The kaput wattage may vary from70to 130 watts depending on the output volume being used) Power Consumption - RAE84- 130 Watts Average (The input wattage may vary from 90 to 150 watts, depending on the output volume being used) R 78 WITHOUT NOISE SUPPRESSION Type of Circuit. .Sup

3、er -Heterodyne with A.V.C., CompensatedA.F. systemand Class B output stage Type and number of Radiotrons4 RCA -58, 5 RCA -56, 2 RCA -46, and 1 RCA -82, Total 12 R78 L RAE 84 WITHNOISE SUPPRESSION Type of CircuitSuper -Heterodyne with A. V. C., Compensated A. F. System, Class B Output Stage and Noise

4、 Suppressor Type arid Number of Radiotrons. .1 RCA -55, 4 RCA -58, 4 RCA -56, 2 RCA -46, 1 RCA-82-Total 12 Undistorted OutputApproximately 20 Watts Maximum Type of Record ChangerPerfected RCA Victor Ten 10 -Inch Record Continuous Type Type of Pickup and Tone ArmLow Impedance Pickup with Inertia Tone

5、 Arm Type of MicrophoneTwo Button Carbon MAGNETIC PICKUP RECORD 40 T01 RATIO SUCH AS STOCK No.7445 -Connections for Attaching Magnetic Pickup Note: The above connections are for models not having noise suppressor.Identical connections are used for models having noise suppressor, except connections s

6、hown to terminal No. 5 are made to No. 4. RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. A. CD 16-325 1 wan I 241. 4801/14 TO newt air 600 .C.N1124C710401. _Lft a .1Wei O.;400400. 04 , 403340. Tr- -_Jn leotteie_s , via.% /to V ACINPUT tive. CT 4-50 MUD 1113 Intl RCA 26 ea C

7、11C10 15-75COO Mum 1214711 CI6 I40-720 Pallmr0. CID 1500Ru want 22424. C TT CID Jura13110.1300. C21 U. 1.3int 1335. 53 75C1200 27 1.4141rD.UNTO 2%P.DV1. I RCA 36 140-2 C24 O 20 l C20 4WD. Ps r 713 4-3 C22 Sum. Increased sensitivity on weak stations can be had by shorting out the 400 ohm section of t

8、he volume control. RCA 82 latent110.20,12. RECT.CDS RESISTOR BOARD COINIECTIONS I C35 .005 Pwit. AMP13. 07 RCA 46 51, -Schematic Circuit Diagram models without noise suppressor C-111 24 1111/0. ,INTERNAL CONNECTIONS OF 1sr LF.TRANSFORMER 40.MA INTERNAL CONNECTIONS OF Eno LE TRANSFORMER .-17-.HUM SUP

9、PLY rountstus -C10-1113C. irot, 111 I.F. MP I. F. TRANSFORMER TRA NSFOR 0 MER e e e SP SP 0 :1: ,r Jr, 2357 0 -Location of I. F. Tuning Capacitors Co Po rnco L -I OLL WOUNDS TOMMIE MI UT WOUND 0111115111111. ILIUM t41 C-7C- 11-414-5410 NIL AMR. IC -542,v 5-2 4040004 11-3 100004 P-2 C- - e .411.01*At

10、- P-I A.0 3.1/ O -I 17004 I-7 t1004 TO Pal ILATTic, AMO01A1uc.3. C -T 4-51 TO 011 5444. FILAMFAIS C 10 11510141115. C-4 t,73 INTERNAL CONNECTIONS OF 113TLF. TRANSFORMER C-40-10 IS -1500 lelfl c-ff FM1 -II 04 POPO. M. 4011 C-4 140 III C-15 13751001t-ff OIWO 11-11 M 000I11 4500. CMFD025. - .015 MFD. 1

11、9g R-26R-29 Ec 0 0 -20000.-15, RESISTOR BOARD - CONNECTIONS ; ; V 77; .4 A. C. INPUT PLUG YELLOW WITH RED TR.- RED continuous playing ofone side of ten 10 -inch records, operation at either 33% or 78 R.P.M. for playing standardor Program Transcription records manually or automatically, a special clu

12、tch to prevent jamming incase of failure of a part and a heavy duty motor operating at synchronous speed thereby eliminatingany need for regulating devices. The automatic mechanism used in the RAE -6b is similar to that used in RAE -26, RAE -59 and RAE -79. However it is 76 r.p.m. only. The automati

13、c mechanism used in the RAE -84 is similarto that used in other RCA Victor auto- matic combinations such as Models RAE -26, 59,or 79. Several minor changes have been made in these machines as follows: 1. Concentric Groove Trip. A trip so that either Brunswickor Columbia records may be mixed with Vic

14、tor records in the automatic magazine has been provided. 2. An automatic starting switch, operated by pulling thetone arm to the right, has been added for manual playing. 3. A trip to stop the motor when playing either 10- or 12 -inch records manually has been added. 4. An interlock has been provide

15、d so that the manual lever cannot be moved while the mech- anism is in cycle. This prevents jamming due to improper operation. 5. A ball race speed reducer is used for changing the turntable speed from 78 to 33Y3 R. P. M. This is simple in operation and gives a greater freedom from wows than the gea

16、r type reducers. 6. Needle Lamp. A small electric lamp is provided so that proper illumination of the record and pickup is obtained. This assists in properly inserting the needle into the pickup as well as lower- ing the needle onto the record. Service in conjunction with this mechanism will therefo

17、re be practically thesame as that of the older type automatic record changing mechanims. However, dueto the new trips several additional adjustments are now included. (1) ADJUSTMENT OF AUTOMATIC SWITCH The automatic switch should be adjusted so that the contacts are at least 0.025 inches apart when

18、the switch mechanism has been tripped. This is important, as otherwise arcing at the switch may occur. (2) ADJUSTMENT OF 10 -INCH AUTOMATIC SPIRAL GROOVE TRIP LEVER The 10 -inch automatic spiral groove trip lever should be adjusted bymeans of the screw assembled thereon. Proper adjustment is obtaine

19、d when it forces the four finger lever out of contact with the clutch pawl, which trips the mechanism, when the needle is betweena 1% inch and a Ui inch radius from the center of the turntable spindle. (3) ADJUSTMENT OF 12 -INCH AUTOMATIC SPIRAL GROOVE SWITCH The 12 -inch automatic spiral groove swi

20、tch should be adjusted bymeans of the adjusting screw assembled in the trip lever so that it forces the switch lever out of contact with the switch trip lever, causing the latter to open the switch when the needle is between a 1 inch and a Ui inch radius from the center of the turntable spindle. RCA

21、 VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. A. PAGE 251-A AUTOMATIC RECORD CHANGER Remember That the Control Lever Can Be Changed from Automatic to Manual Only When the Mechanism is Not Changing Records Place a Home Recording needle into the pickup as far as it will go. The

22、n lower the pickup on the side of the turntable. The needle shouldextend from to I.6 below the top of the metal edge of the turntable. If it does not, an adjustment can be made by means of a screw located under the tone arm. Lifting the arm provides accessibility to the screw. See Figure 2. If when

23、starting the automatic mechanism, the needle lowers onto the smooth outer rim of the record but fails to swing into the first groove, it may be caused by the following: (a) Cabinet not level. (b) Weak tension in spring. A flat spring presses against the tone arm lever on the under side of the motor

24、board. See Figure 17 Bending it so as to increase its tension against the tone arm lever will cause the needle to swing into the first record groove. Be careful not to bend it too much as excessive tension will cause the needle to skip several grooves. After the instrument has :ompleted one record c

25、hanging operation, a ten inch record should extend about three-quarters way over each elevator pad. If this condition does not exist, an adjustment can be made by means of the screwsthat hold the pads in position. A pair of pliers heavily padded with cloth or other soft material should be used to ho

26、ld the elevator shafts while loosening and tightening the screws. The distance from the closest part of either pad to the edge of the spindle is approximately 434. Figure 3 shows the method of making this adjustment. Figure 2-Adjusting height of lone armFigure 3-Adjusting elevator pad umarnife mnoom

27、mel.=lw 11111111 PAL Figure -Adjustment of damper pads (1) SPEED VARIATIONS (WOW) A variation in the speed of the turntable evidenced by distortion on long sustained notes when playing Program Transcription records may be caused by any of the following: (a) Improper operation.It is very important wh

28、en changing the speed shift lever from 78 R.P.M. operation to 33N R.P.M. operation, to place the hand on the turntable and hold it until it is positively engaged by the driving mechanism. (b) Lack of proper lubrication.It is important that excessive grease on the gear reducing mechanism be avoided a

29、nd that sufficient oil is present between the ratchet and the surface upon which it rests. Also clean and oil the spindle bearing and wipe off any excesslubricant that may be on the damper pads or the drive gear upon which it rests. Improper Adjustment of the Damper Pads. The damping pads with the n

30、ecessary springs are provided to place a load on the 33N R.P.M. driving gear atall times while it is in operation. Placing such a load on the gear takes up any possible play and reduces the possibility of a wow during operation at the slower speed. Adjust these pads by slipping each spring to one si

31、de and bend them until they are life beyond the opposite surface upon which they rest.(See Figure 4). (d) Washers Not in Place. A metal washer is placed directly under the speed reducing mech- anism and a leather washer directly over it, both washers being over the spindle.These washers must be in t

32、heir proper position.Also if the leather washer has become hard it must be replaced. In some cases, removing the speed reducing mechanism and turning it approximately 90 and then replacing it, may eliminate a wow caused by improper meshing of the gears. (c) (e) PAGE 2 5 2-A AUTOMATIC RECORD CHANGER

33、(2) ADJUSTMENT OF MAGAZINE ROLLER The magazine roller should be set in sucha position that the plane of the roller is 90 to a line drawn from the center of the magazine bearingto the center of the roller. The height should be adjusted so that it will just touch the magazine when it isempty. (3) FAIL

34、URE OF NEEDLE TO LOWERPROPERLY Failure of the needle to lower onto the smoothouter rim of the 10 -inch records when the instru- ment is playing automatically may be caused by: (a) Improper Tone Arm Setting. Loosen the set screws as shown in Figure 5. With the mechanism out of its cycle, press the lo

35、cating leverat a point near the flat spring until the lever strikes the stopscrew. Holding the locating lever, Figure 17, in this position, move the front portion of the trip lever, Figure 15, until the pin against which the flat spring presses, is making contact with the locating lever. Holding the

36、 two levers in this position, move the pickup arm until the needle is if6 from the firstgroove of a standard 10 -inch record. Now retighten the two set screws shown in Figure 5. (b) Figure 5-Adjusting position of tone arm Figure 6-Adjusting tone arm locating screw Improper adjustment of tone arm loc

37、ating screw. This adjustment, shown in Figure 6, can be used to make a substitute adjustment for that described in (a), when the mechanism is out of the cabinet. Make the adjustment so that the needle will lower exactly 1/f6 from the first groove on a standard 10 -inch record. Loosen the lock nut on

38、 the adjusting screw by means of a No. 4 Spintite wrench on which the shoulder has been ground sufficiently thin for clearance. Do not attempt to make this adjustment without first loosening the locknut. Tighten the lock nut when the proper adjustment has been made. (4) FAILURE OF NEEDLE TO LOWER ON

39、TO RECORD SURFACE Failure of the needle to lower onto the record surfacemay be caused by: (a) Cable out of pulley. Examine the tone arm cable and ascertain that it is seated in the pulley. (b) Shielded pickup wire improperly placed. Examine the shielded lead coming out of the tone arm base and make

40、sure that it is free from the moving parts of the mechanism. (c)Incorrect setting of tone arm lowering screw. Check the position of the tone arm as described in Paragraph 5, (d) Turntable washer not in place. A leather washer is suppliedto fit under the turntable. If this part is not in place, the t

41、urntable will be too low, andmay cause the needle not to lower onto the record. (e)Incorrect adjustment of cable tension screw. The cable tension screw shown in Figure 7 should be so adjusted that the needle will lower smoothly onto the record without dropping. When this adjustment is obtained, the

42、cable will be slightly loose when the needle is lowered onto a record. Loosen the lock nuts, turn thescrew to the right or left as required and retighten the lock nut. Check the adjustment to make sure that the needle clears the record on the return of the tone arm. The needle should rise ;f6 from t

43、he record before any horizontal motion takes place. (5) NEEDLE FAILS TO CLEAR RECORD AFTER PLAYING Failure of the needle to clear the record surface on the return of the tonearm is caused by too loose adjustment of the cable tension. Adjust this tensionas described in Section 4, Paragraph (e). PAGE

44、253-A AUTOMATIC RECORD CHANGER (6) FAILURE OF RECORD TO DEPOSIT ON TURNTABLE Incorrect lowering of the record onto the turntable may be caused by (a) Improper turntable spindle height.The height of the turntable spindle nose should be approximately 1,1 above the inside bottom surface of the record m

45、agazine. Adjustment of this height made by means of the screw at the bottom of the motor.(See Figure 8). Figure 7-Adjusting lone arm cable tension screwFigure 8-Adjusting spindle height (b) Improper setting of magazine. The horizontal swing of the magazine should be so adjusted when the mechanism is

46、 out of cycle that the outer surface at its nearest point to the nearest side of the turntable spindle is 5142.This can be done by loosening the two screws as shown in Figure 9, moving the magazine to its correct position and retightening the screws. (c) Improper height of record transfer lever.The

47、small plate on top of the motor board at the left side of the turntable should be so adjusted that it will depress approximately when the magazine swings over the turntable.When this adjustment is made cor- rectly, the transfer lever will engage the bottom record in the magazine as the latter is swi

48、nging back into the playing position. A small adjusting screw and lock nut are provided for this adjustment.See Figure 10. (d) Improper Position of Record Transfer Lever. When a ten -inch record is placed so that its edge touches both pins on the record transfer lever, a line drawn from the center o

49、f the hole of the lever to the center of the record hole should pass directly over the center of the spindle.See Figure 11.The two record transfer lever mounting screws can be loosened and the lever shifted until this condition exists.Also when a record is on the turntable it should just clear this lever.Unless this adjustment is properly made the record may not center properly over the spindle. (e) Figure 9-Magazine adjustmentsFigure 10-Record transfer lever adjustment Weak spring in turntable spindle.The spring inside the turntable spindle which holds up the spindle nose w