RCA-Victor-Co-Inc-RP-151 电路原理图.pdf

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1、Automatic Record Changer PAGE 713-C RP -151 RECORD SUPPORT RECORDS RECORD SEPARATOR Introduction The RP -151 is an automatic record changer of revolu- tionary design. It will play a series of fifteen 10 -inch or twelve 12 -inch records on both sides, or one side, at will. The pickup arm has two ligh

2、t -pressure, sapphire permanent - point, crystal pickups mounted on one arm. One pickup plays the top side of each record; the other pickup plays the bottom side. The turntable rotates in reverse while the bottom side of a record is being played. The mechanism has two motors. One motor is used solel

3、y to rotate the turntable; the cycling motor drives the mech- anism during the automatic record -changing cycle. There are three simple controls. 1. A Record Support-Turn it one way to load a stack of 10 -inch records, the reverse way to load 12 -inch records. 2. A Control Lever-Push the lever to lo

4、ad position, then back to the two -side position to play both sides of each record; pull it forward to play only the top side of each record. 3. A Start -Reject Button-Push the button to start the mechanism or to reject a record when the mechanism is operating. The mechanism uses a low -noise crysta

5、l pickup. Objection, able needle chatter has been removed by utilizing a low mass wire, suitably damped, to hold the sapphire point. Service Procedure To remove the bottom plate assembly from the motorboard: 1. Disconnect pickup leads from terminal board. 2. Remove the motor lead plugs from their so

6、ckets. 3. Loosen the set screws C and lift the tone arm out. Be careful not to lose the two ball bearings at the top and bottom of the tone arm pivot shaft. 4. Remove the four bottom plate mounting screws. To remove the tone arm, turn out the slotted -head bearing through the side of the arm. Then s

7、imply lift the arm off. When replacing the arm, do not tighten the bearing enough to cause a bind in vertical motion. Lubrication 1. Apply Houghton Stayput at all bearing surfaces. 2. Apply graphite grease at cam and gear surfaces on the main cam and gear, pinion gear (1), and segment gear, pivot an

8、d cam surfaces on the slide, and the spring pin on the counterweight. 3. Apply Lubriplate No. 110 at all other points. RECORD SEPARATOR PICKUP ARM MOTOR BOARD PICKUP CONTROL LEVER TURNTABLE SWITCH START -REJECT BUTTON R-818 Cautions 1 Do not oil the tone arm pivot shaft. 2. Never use force to start

9、or stop the motor or any part of the record -changing mechanism or pickup arm. 3. Warped or damaged records may cause the mechanism to jam. 4. Do not leave records on the record -holder posts as they may warp, particularly in warm climates. Warped records may be flattened by placing them on a flat s

10、urface with a flat heavy article placed on top of them for a few days. 5. If for any reason the phonograph stalls, turn off the turn- table switch and remove the records from the record holder shelves. Start the turntable and allow the pickup arm to complete its cycle. 6. Packing material and specia

11、l shipping brackets should be given to the customer at the time of installation. Advice as to their use may save service calls should the customer later move the instrument any considerable distance. 7. Do not interfere with the motion of the tone arm at any time. 4. The rubber tires must be kept cl

12、ean and free from oil, grease, dirt, etc., at all times. Any quick -drying naphtha is satisfactory for cleaning the rubber. Two -Side Operation Turn Record Sup- port to 10 or 12 position as desired. Place Records on Turn Control to Load position and return to Two - Side position. Push Start -Reject

13、button. Slide Cycle 1. Record Separator posts position them- selves in unison by means of belt drive. Posts. 1. Star wheel stud is rotated away from slide throw -out lever, thus insuring a Slide cycle. Motion is transferred from control to the index lever and the star wheel lever. Star wheel lever s

14、tud rides in the index lever slot. 1. Through button lever the reject lever is made to push on ratchet lever stud. RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. 1., U. S. A. 收音机爱 好者资料库 RadioFans.CN PAGE 714-C RP -151 2. The ratchet lever moves out of the way of the cycling switch tr

15、ip lever. 3. Switch trip lever moves the cycling switch pivot lever, thus tilt- ing the switch and closing the circuit to the cycle motor. 4. Cycle motor starts. 5. Main cam is driven by cycle motor through a chain of gears. Tone Arm Rises. 1. The elevating control lever is rotated because its stud

16、rides on the outer guide on the bottom side of the main cam. 2. Elevating control lever closes shorting switch. 3. Elevating control lever pushes reversing lever. 4. Reversing lever rotates. 5. Elevating control lever pushes elevating lever roller. 6. Elevating lever roller moves in allowing elevati

17、ng lever to rise, thus pushing up on elevating rod and tone arm. Tone Arm Swings Out. 1. Reversing lever throws reversing switch. Then it latches and holds the switch button in position. 2. Turntable rotates counter -clockwise. 3. Tone arm lever swings outward from motion of its stud against outer g

18、uide on top of main cam. 4. It pushes against stud on trip lever. 5. Trip lever moves out and latches to return lever carrying it along. 6. Feed -in spring is depressed. 7. Cycling switch trip lever is reset by protrusion on main cam, and thus moves out of way of ratchet lever stud. 8. Ratchet lever

19、 returns to its original position. Turntable Discards 1. Eccentric track on top of main cam moves slide roller lever. 2. Slide roller lever pushes slide throw - out lever. 3. Slide throwout lever moves slide control lever. 4. Slide control lever moves slide. Played Record. 5. Underneath stud on slid

20、e moves along edge of turntable locating lever and finally rotates it. 6. Locating lever releases turntable assembly to control of counter- balance and spring, leaving sector gear free to move. 7. Slide strikes sector gear finger and rotates sector gear. 8. Sector gear rotates segment gear. 9. Segme

21、nt gear, being fastened to turntable pivot shaft, turns this shaft and tilts the turntable. 10. Reversing lever is unlatched by slide at end of its travel. Turn- table motor returns to clockwise rotation. Record Drops from Stack to M otor- board. 1. Stud on top of slide moves into claw cam of the se

22、parator lever. 2. Lever rotates, thus moving link and crank. 3. Crank rotates separator assembly. 4. Record knife separates bottom record from stack. 5. Shelf rotates out from under bottom record and allows it to drop to motorboard. Turntable picks up 1. Slide reverses direction of travel. next reco

23、rd. 2. Shelf and knife return to original posi- tion as top stud on slide releases separator lever. 3 Spring and counterbalance return turntable past its original posi- tion as slide recedes from sector gear finger. 4. Turntable spindle finds hole in record and picks record up. S. Underneath stud on

24、 slide finally rotates locatine lever 6 Locating lever takes control and returns turntable to exact orig- inal position. 7. Turntable drive wheel again contacts drive disc and rotates it. 8. Off -center stud on the main cam and gear pushes star wheel stud. 9. Star wheel rotates 90. 10. Stud on star

25、wheel unlatches slide throw out lever. TURNTABLE DRIVE MOTOR 23 3 4 5 6 REVERSING SWITCH ELEVATING CONTROL LEVER PAWL COUNTERBALANCE REVERSING SWITCH SPRING LEVER CYCLE MOTOR 21 17 CYCLI NG LEVER SWITCH REVERSING SWITCH MOUNTING SCREWS 收音机爱 好者资料库 RadioFans.CN Tone Arm Returns. 1. Main cam allows ton

26、e arm lever to recede. 2. This allows return lever to follow. PAGE 71.5-C RP -151 3. Ratchet lever stud moves away trom carryingcycling switch trip lever. trip lever along. 4. Cycling switch trip lever moves cycling switch pivot lever. Switch 3. Return lever stops when its index finger reaches rear

27、separator tilts, dosing circuit. shaft. 5. Cycle motor starts. Torse Arm Rises re and Swings Out. 4. Thus the trip lever and tone arm are stopped at the correct landing position. Tone Arm Lowers. 1. Lower outside face on main cam cedes. 2. Elevating control lever returns to original position. 3. Rev

28、ersing lever reaches original position. 4. Elevating lever is lowered, elevating rod follows and tone arm lowers. 5. Elevating control lever releases shorting switch. 6. Release stud on the tone arm lever pushes back the latch on the return lever. 7. Release of the latch frees the return lever from

29、the trip lever and the tone arm. 8. Cycling switch pivot lever drops off the end of the main cam face. 9. Cycling switch returns to original position. 10. Cycle motor stops. Sapphire is pushed into music grooves. 1. Feed -in spring returns to original posi- tion pushing stud on trip lever. 2. Trip l

30、ever carries tone arm slightly in. Top side of Record Plays. Non -Slide Cycle Sapphire Reaches Eccentric Groove. Mechanism Trips. MAI N CAM AND GEAR 13 1. Trip lever receives backward motion from tone arm. 2. Trip pawl pushes ratchet lever. TURNTABLE 15 TONE ARM LEVER Turntable Remains in Playing Po

31、sition and Turntable Ro- tation Reverses. versing lever remains I revolve counterclockwis 4. Off -center stud on 5. Star wheel rotates 6. Star wheel latches Same as previous cycle. 1. Eccentric track on top of main cam moves the slide roller lever. 2. Slide throw -out lever is not picked up by star

32、wheel since this lever was un- latched during previous cycle. 3. Thus the slide does not move,the re- atched and the turntable motor continues to e. main cam pushes stud on star wheel. 90. slide throw -out lever. Tone Arm Returns. Tone Arm Lowers. Same as previous cycle. Same as previous cycle excep

33、t: 1. Revers- ing lever remains latched and does not return. Bottom Side of Rec- ord Plays. Slide and non -slide cycles continue alternately until entire stack of records has been played. After last record is played, mechanism trips, goes through cycle, and tone arm conies to rest on Stop button, th

34、us opening the a.c. circuit. In the One -Side position, the star wheel is pushed out of the path of the main cam stud and all cycles are slide cycles. SLIDE THROWOUT LEVER SLIDE CONTROL LEVER SLIDE ROLLER LEVER SECTOR LEVER NOTE.-TURNTABLE LOCAI/NG LEVER /S UNDERMEAT/? SL/DE TONE ARM RETURN LEVER 16

35、 14 ELEVATING LEVER ROLLER RETURN LEVER LATCH RATCHET LEVER 收音机爱 好者资料库 RadioFans.CN PAGE 716-0 RP -151 1 SEPARATOR LEVER SEPARATOR LINK BUTTON LEVER MAIN CAM AND GEAR REJECT LEVER ELEVATING ROD ELEVATING LEVER 10 .r_ :,M,. ii1,; t 7.7F 3f. . CYCLING MOTOR 21 CYCLING SWITCH PIVOT LEVER COUNTERBALANCE

36、 LEVER AND WEIGHT CYCL1 NG SWITCH TRIP LEVER FEED -IN SPRING f % RtP LEVER ,ELEVATI NG ROD F 22 TRIIF PAWL TONE ARM LEVER -7:7 RATCHET LEVER STUD TRIMMERS TURNTABLE PIVOT SEGMENT LEVER GEAR PAGE 717-C RECORD REAR SEPARATOR POST SUPPORT REAR SWIVEL TURNTABLE RP -151 FRONT SEPARATOR POST KNIFE SHELF R

37、EJECT BUTTON 11 BUTTON LEVER B FRONT SEPARATOR SHAFT 1 2 COUNTERBALANCE TURNTABLE SLIDE CONTROL CYCLING LEVER AND WEi311T PIVOT SHAFT LEVER MOTOR BELT 19 RECORD SUPPORT BELT DRUM TURNTABLE BOTTOM BEARING SCREW STAR WHEEL LEVER STAR WHEEL . . -,.+w 41, q SEPARATOR BELT SEPARATO R CRANK DRUM *-*N9;* .

38、 ( + _,(1 CONTROL SHAFT INDEX LEVER SEPARATOR LEVER AUTOMATIC STOP SWITCH PICKUP 20 -TRIP LEVER SEPARATOR LEVER RECORD SUPPORT BELT SEPARATOR CAM CRAN K SEPARATOR LINK PAGE 718-C RP -151 Records will not fit properly on the three record posts. (Record Post Spacing) Records fail to drop at proper tim

39、e. (Record Shelf Timing) Sapphire fails to land at proper point. (Tone Arm Position with Respect to Trip Lever) Spindle fails to pick up the record or turntable fails to drop the record. Turntable does not re- turn to proper posi- tion. (Turntable Vertical Position) Sapphire fails to clear record on

40、 turntable. (Tone Arm Height While in Cycle) . Top sapphire jumps grooves or pushes too hard against record. (Top Sapphire Pres- sure) Bottom sapphire jumps grooves or pushes too hard against record. (Bottoni Sapphire Pressure) Sapphire lands prop- erly but fails to feed into music grooves or feeds

41、in too fast and jumps several grooves. (Feed -in Spring) Turntable too high or too low. Quick Reference Chart of RP -151 Adjustments Turn the record support to the 10 -inch position. Loosen the set screws A. Move the front record separator post until its shaft is 1/64 from the end of the motorboard

42、slot. Turn the belt drum to take up the slack in the belt and tighten the zinc -plated screw being certain to maintain the 1/64 -inch spacing. Repeat the adjustment on the rear separator post. Check by placing a 10 -inch record on the shelves posts and then tighten the copper -plated screws. Care sh

43、ould be taken to leave a small vertical clearance between the belt drum and the motorboard. The 12 -inch position is automatically main- tained. Place a 10 -inch record on the shelves so that it contacts the front and rear record separator posts. With the changer out - of -cycle loosen the set screw

44、s (B) and turn the record sep- arator shaft until the record separating knife is 3/32 -inch away from the record edge. Position set screw collar bottom edge 1.3/32 above the bottom plate. Tighten the zinc -plated screw, run through cycle several times as a check, then tighten the copper -plated scre

45、w. Repeat the adjustment on the rear separating knife. Place a 10 -inch record on the turntable and rotate the changer through cycle until the sapphire is just ready to land. Place a .005 feeler between the shoulder on the tone arm pivot shaft and its ball bearing as shown. Loosen the set screws (C)

46、. Make certain that the tone arm return lever is against the record separator shaft and the pin on the trip lever is against the tone arm return lever. Move the tone arm to the point of proper landing, be sure the set screw collar is up against the tone arm pivot shaft bushing, then tighten the zinc

47、 -plated screw. Run through cycle several times as a check, then tighten the copper -plated screw. Remove feeler. The 12 -inch landing is then automatically correct. Remove the counterbalance spring. Loosen set screws (D). (See photograph for screw location.) Centrally locate the turntable with resp

48、ect to the front and rear edges of the motorboard slot by sliding the turntable pivot shaft in its bearings. Mesh the sector and segment gears as shown. Hold- ing them in this position, move the turntable assembly until the turntable is level. Tighten screws (D). Loosen set screws (E). (See photogra

49、ph for screw location.) Set the counterweight as shown. Check to see that there is clearance between the two set screw collars (D -E) and the turntable pivot shaft bearing. Tighten the zinc -plated screw (E), run through cycle several times as a check, then tighten the copper -plated screw (E). Replace the