RCA-Victor-Co-Inc-V-140 电路原理图.pdf

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1、PAGE 70-C MODEL V-140 Chassis No. RC -572A Six -Tube, Single -Band, A -C, Superheterodyne Radio / (. TIMING , DRIVE CAM PAWL u, :. =- ,- n Turntable does not turn freely. (Turntable Bottoni Bearing Position) Loosen the bottom bearing screws B and position the bottom bearing plate until the turntable

2、 revolves freely: Tighten the screws and check by applying a.c. to the turn- table motor then shutting it off and noting that the turntable continues to make at least twelve revolutions. Bin iiCii POSITION / /ADJUSTMENT OF 10, RECORD AT 1a _ i 2 Records strike sea -22 rotor post or fail to stay on r

3、ecord shelf. (Spacing Between Record Posts) isci Turn the record support post to the ten -inch position. Loosen set screws C, hold the separator post against the end of its slot in the motorbtiard and turn the belt drum to take up any slack it the belt. Tighten the zinc -plated, blunt- nosed screw a

4、nd check to see that a ten -inch record fits the posts as shown. Then tighten the copper -plated, cone -pointed screw. The twelve -inch position is adjusted after that of the ten inch, by changing the support post to take the twelve -inch record, and turning the eccentric stop until the edge of the

5、record is halfway up on the record support bevel while the other edge is against the record separator post. - 7,-is B BOTTOM T RECORDKZPTAK D. iiDIs e RECORD SEPARATOR KNIFE e DJuSTAAENT 12 SHELF Records do not dropthe at proper time. (Record Shelf Tim- ing) SIDS Place a ten -inch record on the post

6、s. Loosen the set screws D and turn the record separator shaft until the edge of record -separating knife is one -sixteenth inch away from the edge of the record. The teeth on the inner circumference of the knife should be resting in the bottom of their slots at the time the adjustment is made. Tigh

7、ten the zinc -plated screw first, run through cycle several times as a check, then the copper -plated screw. Do not tighten set screws D enough to distort the housing of the separator shaft spring. RECORD SEPARATOR di9-= AND SWIVEL I , rf F=t 7 ; ; ;i W SEGMENT 1 ;e,= E +i INDE% FINGER ON TONE ARM R

8、ETURN LEVER ie .rr ie v Tone.arm continues to repeat playing of top record or jams when part way in on record. (Segment height or radial position) / E Take all records off the posts. Loosen the set screw E. Set the record separator segment so that the index finger of the pickup arm return lever ride

9、s on the middle of the segment, as shown. Rotate the cam until it is in such a position that the index finger will never ride off either end. Check to see that the index finger rides in over top of the cam when the record shelf is depressed by the weight of one record. Tighten the set screw. INDEX F

10、INGER SEGMENT E 24 TONE ARM RETURN 0411 Q FEED -IN osm.G LEVER Sapphire does not land at correct point on 10- inch record. ;F (Tone Arm Position With Respect To Trip Lever) C o r r e c t dimension from outside edge of s i n d l e to sapphire 416 inches. Place a ten -inch record on the turntable and

11、rotate the changer through cycle until the sapphire is just ready to land. Make sure that the index finger of the pickup arm return lever is against the record separator shaft and that the tone arm trip lever stud is held firmly against the return lever. Loosen the set screws F and move the pickup a

12、rm to the correct landing position. See that there is a 1/32 inch clear- ance between the pickup arm bearing and the set screw collar. Tighten the zinc -plated screw, run the changer through cycle several times as a check, then tighten the copper -plated screw. The twelve -inch landing position is a

13、utomatically main- tanned. rv,0 RATCHET LEVER 23 STUD (. LTRIP EVER TRIP F G. i t PSU; O ;M, BRACKET I 1 T niiiii y 1 Top of pickup arm strikes stack of rec- ords or sapphire fails to clear the records on the turntable. iv. (Pickup Arm Height WhileIn Cycle) Rotate the changer through cycle until the

14、 pickup arm has risen to its maximum height above the turntable but has not begun to move out. At this point adjust the screw G until the distance between the turntable and the sapphire is one and three -sixteenths inch. Tighten the locknut. PAWL STUD ,/TRIP MAINTAIN Y32 LEVER CLEARANCE i,=. -_ IN 2

15、3 ,(TONE MANON DAM ARM GEAR LIFT ROD Ytlit -/i ARM LIFT LEVER BOTTOM BRACKET PAGE 741-C RP-I58, RP-I60, RP-I61, RP-I62 Mechanism fails to start, or automatic stop switch is inopera- tive in automatic po- sition. H (Control Cam Position) RP -180 Set the control lever to automatic. Loosen set screw H

16、and move the control cam until the stud on stop switch is centrally located as shown. Tighten set screw H. CONTROL CAM STOP SWITCH No output, or noise during cycle. J (Position of Pickup Shorting Switch) RP -180 Loosen screws J. Position the switch to obtain Y32 -inch clearance between the switch bl

17、ades when the tone arm is in playing position. Tighten screws J. Make certain that the pawl is on the correct side of the long leaf spring in the shorting switch. Fails to Trip: First check adjustment F. Do not tighten screws F too tightly or the hollow pivot shaft will be distorted. ARM TWISTED-, E

18、XCESSIVE PLAY IN BEARING Ccl TOO STRONG USE VASELINE TRIP LEVER IP wiejA O G TOO , TRIP BLUNT PAWL TRI P LEVER LOOSE OR MISSING_ TIMING NOTCH LOOSE OR MISSING BINDS MAINTAIN CLEARANCE CREWS LOOSE RATCHET LEVER TOO STRONG ROUGH OR BURRED DRII,E CAM P/WL BINDS ON DRIVE CAM BURRS LATCHET LEVER BINDS TO

19、NE ARM LEVER SMORTI NO PAWLH Lands Incorrectly. Fi=st check adjustments F, C, M, E. TONE ARM RETURN LEVER TRIP LEVER STUD USE VASELINE STUD /l BENT BINDS PICKUP SNORTING SWITCH LOOSE OR MISSING FEED IN SPRING BENT OUT TOO FAR BURRS OR BINDS BETWEEN LEVER ADJUSTMENT FEED - IN I_E VF R O iflMllllMllll

20、lr0 O FEED- IN SPRING TONE ARM RE-ruRet LEVER Stock No. 39751 tone arm return lever has a cam to adjust 12 -inch landing position, and a positive acting feed -in mecha- nism. The feed -in tension can be adjusted by hooking the spring in a different hole on the bracket, and by bending the bracket. Ba

21、kelite Alternate Replacement Parts: file following shows a comparison of replace- ment part stock numbers for the above record changers when Bakelite parts are used as alter- nates for regular die -castings: Stock No. Stock No. Description Die -Cast Bakelite Record Separator Assembly: Separator cap

22、384711 3847(1 Separator knife :18467 39768 Separator spring (upper) :184118 :19769 Separator spring (bot- tom) (RP -158, -160, -161) 38621 39968 Separator shelf and shaft (RP -158, -160, -161) 38652 39767 Separator shelf and shaft (RP -162) 39035 39770 Main Cant 38641 :39760 Record Support and Shaft

23、 (Left hand front post): (RP -158, -160, -161) 38645 39762 Record Support Cam: . (RP -158, -160, -161) 38646* 39763t Tone Ann Segment Cam: - (RP -158, -160, -161) 38619* 39764f *The die-cast cams 38646 and 38619 require a 10-32 set screw, stock number 32869, to fasten cam to shaft. The hakelite cams

24、 39763 and :19764 require a drive pin, stock number 39765, to fasten cam to shaft. (A drive pin is included with 39763 and 39764). RP -158, RP -160 Eccentric. Stop, No. 39569: In Replacement Parts, add Stock No. 39569 eccentric stop for record separator support. Slow Speed: In cases of slow speed, a

25、djust the bottom bearing of turntable spindle to remove binding and to obtain free rotation. Refer to adjustment B in Service Data. Check by applying power to the turntable motor, allowing turntable to reach full speed, then pull motor away from turntable drive disc. The turntable should coast for a

26、t least twelve revolutions. (In RP -162, dis- engage motor from turntable by pulling idler away from turntable to observe coast.) RP -160 Spring For use with Zinc Crystal: On RP -160 with aluminum pickup arm, and aluminum -cased crystal, the spring that governs pickup pressure is No. 30585: with zin

27、c pickup arm and aluminum -cased crystal, the spring is No. 39673. When installing a zinc -cased cry- stal in a zinc arm, cut 11 turns off the spring, or install a No. 39754 spring. RP -160 Sapphire Pressure: The correct sapphire pressure in RP -160 is approximately 1 ounces. The pressure is governe

28、d by a spring inside the end of the pickup arm. Owing to the fact that both aluminum and zinc castings (with difference in weight) have been used for the arm and the crystal, and also that only the zinc crystal (Stock No. 39550) is supplied for replacement, In order to reduce idler wheel noise, the

29、two metal washers have been replaced by two fiber washers in the Idler Wheel Assembly, Stock No. :36274, for the above record changers. The new fiber washers are Stock No. 39996, Tone Arm Stop Bracket: On 2nd production RP -158 and RP -160, a stop bracket has been added to the top of the motorboard

30、to restrain the ton arm. It is mounted by means of the same screw, lock - washer, and nut used to mount the pickup shorting switch. Where difficulty is experi- enced with excessive movement of the tone arm on 1st production mechanisms, this bracket may be added as shown. The bracket is Stock No. 398

31、32. SHORTING SW MOUNTING SCREWS BRACKET AUTOMATIC STOP Sw. no MANUAL OFF Tone -arm stop bracket (No. 39832) position on RP -158, -160. Change in Reject Lever and Button: 2nd production of RP -158 and RP -162 auto- matic record changers have a reject lever ar- rangement as shown in accompanying sketc

32、h. Stock No. Description 39755 39758 39757 Button-Reject button Lever-Reject lever and stud Lever-Reject button right angle lever REJECT BUTTON STK NO. 39755 MOTOR BOARD STK NO. 39757 STK NO. 99756 REJ EC T LEVER Revised reject button and lever in RP -158, -162. it is necessary to check the sapphire

33、 pressure whenever either the crystal or the arm is re- placed. The zinc arm is identified by the letters ZN after the drawing number inside the arm. The zinc crystal is identified by the letters ZN moulded at the rear end of the cartridge. The various combinations are tabulated be- low, along with

34、the Stock Numbers of pivot anus and springs involved. ARM AND CRYSTAL COMBINATIONS CORRECT ARM AND SPRING Aluminum arm Stock 38650 Aluminum crystal Stock 38453 Pivot arm Stock 38603 Pivot arm spring Stock 30585 Aluminum arm Stock 38650 Zinc crystal Stock 39550 + lt Pivot arm Stock 38603 Pivot arm sp

35、ring Stock 30585 Zinc arm Stock 39671 Zinc crystal Stock 39550 Pivot arm Stock 39672 Rivet for arm and spring Stock Pivot arm spring Stock 39754 39674 Zinc arm Stock 39671 Aluminum crystal Stock 38453 Pivot arm Stock 39672 Rivet for arm and spring Stock Pivot arm spring Stock 39673 39674 REVISED RAT

36、CHET LEVER PAGE 745-C RP -I58, RP -160, RP -161, RP -162 In RP -158, -160, and -162, continuous trip- ping can be caused by failure of the ratchet lever to block the drive cam pawl at comple- tion of a change cycle. This has been corrected by doubling the thickness of the end of the ratchet lever so

37、 that it presents a broader face to the edge of the drive cam pawl. The lever with double thick- ness is carried under the same Stock Number (38656) as the original lever, which it super- sedes. ORIGINAL RATCHET LEVER DRIVE CAM PAWL REVISED RATCHET LEVER DRIVE CAM PAW L Continuous tripping in RP -15

38、8, -160, and -162 can be caused by failure of the racket lever to block the drive cam pawl. The replacement lever has double thickness at end to pre- sent a broader face to the drive cam pawl. DINE /ELI Trip Lever and Trip Pawl Spring: The original bronze trip -pawl spring, Stock No. 38562, is no lo

39、nger available. When this spring requires replacement, due to loss or irreparable damage, it is necessary to install either a new steel spring, Stock No. 39961, in accordance with instructions given below, or else install a complete new trip lever assembly which employs the steel spring. In RP -151,

40、 the new trip lever, trip pawl, and steel spring assembly is Stock No. 38561. In RP -158, -160, and -162, the new trip lever, trip pawl, and steel spring assembly is Stock No. 38632. The new lever and spring assemblies will be supplied on orders for the original assemblies. Installing Steel Spring N

41、o. 39961 on Trip Lever: 1. Drill a 3/32 -inch hole in lever as shown. 2. Cut off the tab that was used to anchor the original bronze spring. 3. Install steel spring as shown. Recorder Mechanism Data CUTTER READ TENSION PULLET DRIVE BELT DOE TENYDwYRi4 CARE SPOOL_ CARLE WEIGHT CUTTER READ NEIORT ADJ.

42、 A.5 .CR IVE BELT PULLET AND GEAR NTERNTDiAT GE R D I l1DRrvc ALAR ND ,STYLUSI . SHHOLE GLOCN GDNIROL RNOS NLL DELI L A Cutler :fro: Drive: The cutter head is belt driven from the turntable spindle through the train of gears at the spindle end of the cutter arm. Tension on the drive belt is maintain

43、ed by a tension pulley at the pivot rend of the cutter arm. Two fixed pulleys and one tension pulley guide the cutter head on the recorder arm track. The cutter arm pivot shaft bearing should be so positioned BELT DRIVE LOCKING CUTTER TENSION CONTROL GUIDE PULLEY CAM - _ 1= CUTTER BELT TUD CONTROL K

44、NOB RECORDER i ARM TRACK I GUIDE 11 PULLEYS . m 11WU1PVIWa1 j.,. ,.111111111 WWII _ IlallllllllNl;g111I :Il i_CUTTER CRYSTAL PIVOT ADJ. SCREW IIINIIIIIIII GUIDE PULLEY TENSION IN SPRING , PRESSURE /1 111111 WO RANGE A DJ STYLUS SCREW STYLUS ( / e CAM FLAT SPRING STYLUS ADJ. CONTROL KNOB CUTTER PIVOT

45、 STYLUS PRESSURE RECORDER HEAD ADJ. SPRING CAM SPRING Cutter Head VHS-tla Lubrication: Lubriplate No. 110 should be used on all gear and pulley studs, pivots, sliding and bearing surfaces of the recorder arm and cutter head. However, do not lubricate: the gear teeth, the wooden pulley bearing, the c

46、lamping surface of the belt locking stud, or the recorder arm track. STEEL SPRING 39961 TRIP LEVER TAB PIN REMOVED REMOVED Trip lever with new steel spring. This steel spring can be installed on original lever in place of bronze spring by drilling a 3/32 inch hole and cutting off the tab on original

47、 lever. (RP -161) Recorder No. AMP 110 with reference to the spindle that the spindle clutch fits easily on the spindle and does not bind as the turntable revolves. Leads from the cutter crystal pass over a wooden pulley and down through the cutter arm pivot shaft, slack being taken up by a cable we

48、ight within the pivot shaft. The knot in the leads below the weight should be enclosed by the cavity in the weight so it will not rub or hind against the sides of the pivot shaft. This knot should he so positioned as to allow full movement of the cutter head without allowing the weight to come entirely out of the pivot shaft. Within the cutter head, the leads in the vicinity of the cutter crystal should be free and floating to prevent reaction on the crystal su