RCA-Victor-Co-Inc-RAE-26 电路原理图.pdf

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1、PAGE 49-A MODELS R-11, RE -18, RE -18-A, R-21 A 2, 3 = 7 R.F. CHOKE 801t L-13 -INPUT TRANSFORMER OUTPUT TRANSFORMER GlOr TOTAL BLUE SECONDARY 7700TOTAL -AND-TELLOw- -YELLOWBLUE INTERNAL CONNECTIONS OF INTERSTAGE TRANSFORMER 收音机爱 好者资料库 RadioFans.CN PAGE 51-A REPRODUCER UN IT 1!OS100O R-17 190.000 44t

2、. INTERNALCONNECTIONS OF RESISTOR BOARD R-11, RE -18, RE -18-A, R-21 i tgept2 frcv : III A Ci15 C-114 810112tp to Ci.2p IT RFD MFO. MFO. MED. MED.Mk I.WO. INTERNAL CONNECTIONS OF CAPACITOR PACK N1. 1111WIMI II it gco -32 gw MFR. M. MM. MA. a00.Ob. 00.1 INTERNAL CONNECTIONS OF CAPACITOR PACK III/ TO

3、PICKUP, re iI LI p. ANT. Alignment Procedure REFER TO MODEL R-7 FOR TRIMMER LOCATION. Connect low side of test oscillator to chassis and ground lead during alignment. STEP CONNECT RICE SIDE OF TEST OSC. TO - TUNE TEST OSC TO - TURN RADIO DIAL TO ADJUST TEE FOLLOWING FOR MAX. OUTPUT 1 I -F Grid in se

4、ries with .01 mfd 175 kc Quiet Point near 00 kc S , INPUT TRANSFORMER moo 2 P4 1*)- PE -P acc Ego MODEL RAE -26 OWV cc REFER TO INDEX FOR DATA ON AUTOMATIC RECORD CHANGER III PAGE 53-A R-11, RE -18, RE -18-A, R-21 REPLACEMENTPARTS continuous playing ofone side of ten 10 -inch records, operation at e

5、ither 33% or 78 R.P.M. for playing standardor Program Transcription records manually or automatically, a special clutch 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 use

6、d 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 automatic 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 mach

7、ines as follows: 1. Concentric Groove Trip. A trip so that either Brunswickor Columbia records may be mixed with Victor 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

8、stop the motor when playing either 10- or 12 -inch records manually has been added. 4. An interlock has been provided 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 tur

9、ntable speed from 78 to 33Y3 R. P. M. This is simple in operation and gives a greater freedom from wows than the gear 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

10、the pickup as well as lower- ing the needle onto the record. Service in conjunction with this mechanism will therefore 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

11、 AUTOMATIC SWITCH The automatic switch should be adjusted so that the contacts are at least 0.025 inches apart when 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 automa

12、tic spiral groove trip lever should be adjusted bymeans of the screw assembled thereon. Proper adjustment is obtained 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 t

13、urntable spindle. (3) ADJUSTMENT OF 12 -INCH AUTOMATIC SPIRAL GROOVE SWITCH The 12 -inch automatic spiral groove switch 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 op

14、en the switch when the needle is between a 1 inch and a Ui inch radius from the center of the turntable spindle. RCA 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 Onl

15、y When the Mechanism is Not Changing Records Place a Home Recording needle into the pickup as far as it will go. Then 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 mean

16、s of a screw located under the tone arm. Lifting the arm provides accessibility to the screw. See Figure 2. If when 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

17、 level. (b) Weak tension in spring. A flat spring presses against the tone arm lever on the under side of the motor 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

18、 as excessive tension will cause the needle to skip several grooves. After the instrument has :ompleted one record changing 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 screwsth

19、at hold the pads in position. A pair of pliers heavily padded with cloth or other soft material should be used to hold 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 m

20、ethod of making this adjustment. Figure 2-Adjusting height of lone armFigure 3-Adjusting elevator pad umarnife mnoommel.=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

21、 Program Transcription records may be caused by any of the following: (a) Improper operation.It is very important when 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 mechani

22、sm. (b) Lack of proper lubrication.It is important that excessive grease on the gear reducing mechanism be avoided and 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 da

23、mper pads or the drive gear upon which it rests. Improper Adjustment of the Damper Pads. The damping pads with the necessary 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 reduce

24、s the possibility of a wow during operation at the slower speed. Adjust these pads by slipping each spring to one side 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 reduci

25、ng mech- anism and a leather washer directly over it, both washers being over the spindle.These washers must be in their 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 repla

26、cing it, may eliminate a wow caused by improper meshing of the gears. (c) (e) PAGE 2 5 2-A AUTOMATIC RECORD CHANGER (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 c

27、enter of the roller. The height should be adjusted so that it will just touch the magazine when it isempty. (3) FAILURE 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) Impr

28、oper Tone Arm Setting. Loosen the set screws as shown in Figure 5. With the mechanism out of its cycle, press the locating 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, Fi

29、gure 15, until the pin against which the flat spring presses, is making contact with the locating lever. Holding the 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) Fi

30、gure 5-Adjusting position of tone arm Figure 6-Adjusting tone arm locating screw Improper adjustment of tone arm locating 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

31、 that the needle will lower exactly 1/f6 from the first groove on a standard 10 -inch record. Loosen the lock nut on 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 loo

32、sening the locknut. Tighten the lock nut when the proper adjustment has been made. (4) FAILURE OF NEEDLE TO LOWER ONTO 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 pul

33、ley. (b) Shielded pickup wire improperly placed. Examine the shielded lead coming out of the tone arm base and make 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) Turnta

34、ble washer not in place. A leather washer is suppliedto fit under the turntable. If this part is not in place, the turntable 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 a

35、djusted that the needle will lower smoothly onto the record without dropping. When this adjustment is obtained, the 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 adjust

36、ment to make sure that the needle clears the record on the return of the tone arm. The needle should rise ;f6 from the 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 cau

37、sed by too loose adjustment of the cable tension. Adjust this tensionas described in Section 4, Paragraph (e). PAGE 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.

38、The height of the turntable spindle nose should be approximately 1,1 above the inside bottom surface of the record magazine. 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 heigh

39、t (b) Improper setting of magazine. The horizontal swing of the magazine should be so adjusted when the mechanism is 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

40、 the magazine to its correct position and retightening the screws. (c) Improper height of record transfer lever.The 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 a

41、djustment is made cor- rectly, the transfer lever will engage the bottom record in the magazine as the latter is swinging 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 -i

42、nch record is placed so that its edge touches both pins on the record transfer lever, a line drawn from the center of 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

43、 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 spri

44、ng in turntable spindle.The spring inside the turntable spindle which holds up the spindle nose will cause the records to align improperly with the turntable spindle if the spring tension is too weak or if the spindle nose is sticking inside the spindle. Access to the spring for stretching the coils

45、 or for replacement can be obtained by removing the turntable. (7) RECORDS DISCHARGED IMPROPERLY FROM TURNTABLE Failure of the Record on the turntable to be removed and placed in the magazine can be caused by: PAGE 254-A AUTOMATIC RECORD CHANGER (a) Improper horizontal adjustment of elevator pads. T

46、he elevator pads Figure 16, shouldbe so adjusted that the inside of the pad flange is 434 from the nearest side of the turntable spindle.See Figure 3. Loosen the screw on top of the elevator shaft, move the pad to its correct position, holding both the pad and the elevator shaft in position and tigh

47、ten the screw. Care should be observed that the ridge in the elevator shaft is not turned against the slot in the elevator shaft actuating leverso as to cut the latter. Grip the shaft with padded pliers while this adjustment is being made in orderto prevent the shaft from turning. If for any reason

48、the elevator pads have been removed, always place the one with the rubber surface toward the front of the mechanism when replacements are being made. (b) Improper adjustment of elevator shaft. The elevator shafts should rise to such a height as to give 14 clearance between the lowest surface of the

49、elevator pad bottom and the top of the empty magazine. This adjustment can be made by means of the screw and lock nut as shown in Figure 12. *. Note:RAE -68 only Change 4-,3/16 Change1/16 to5- 1 / 10 to3/32clearance= (8) FAILURE TO TRIP ON ECCENTRIC GROOVE Failure of the mechanism to change records when the eccentricgroove is reached may be caused by: Figure 11-Method of checking transfer lever lateral adjustment Figure 12-Adjusting height of elevator shaft (a) Improper setting of the latch plate. Adjust the latch plate, Figure 17, by means of a small offset screw driver such a