Zenith-Radio-Corp-S-14053 电路原理图.pdf

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1、MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS ZENITH RADIO CORPORATION COBRA-MATIC RECORD CHANGERS MODELS S-14053, S-14054, S-14056, and S-14057 RECORD CHANGER MOUNTING BOLTS RECORD PRESSURE BAR TURNTABLE SPINDLE - RECORD CHANGE BUTTON SPEED SHIFT- LEVER .TONE ARM RECORD CHANGER MOUNTING BOLT STRO

2、BOSCOPE SIZE SELECTOR LEVER GENERAL DESCRIPTION The Zenith Models S-14053, S-14054, S-14056 and S-14057 Record Changers are designed to play standard 78. 45, 33-1 3 and 16-2/3 RPM records of standard commercial dimensions. With few minor exceptions these four changers are alike electrically. The S-1

3、4054 is the basic record changer. S-14053 is practically identical to S-14054 except that it has added parts for the stroboscope feature. The S-14057 is very similar to S-14054 except that it is the export version, it has a 50/60 cycle motor and minor electrical changes. The S-14056 is similar to th

4、e S-14053 except that it is the export version, it has a 50/60 cycle motor and minor electrical changes. The S-14053 deluxe domestic changer as well as the S- 14056, a deluxe export changer have an added feature incorporated in their mechanism in that they have a stroboscope built in, this enables t

5、he most discriminating user to adjust the record speed to an extremely precise point. Features of these changers include playing and automatic ally changing as many as ten 12 or ten 10 records. Ten inch and twelve inch records of the same type cannot be intermixed. A full stack of 7 33-1 3 RPM, or a

6、 full stack of 7 45 RPM records (with adapter inserted in the records) can also be played on this changer. These changers do not shut off after the last record, however, all that is required to turn the changer off is to move the speed change lever (24) to OFF position. Connect this changer only to

7、an outlet supplying 117 volt 60 cycle A.C. unless specified otherwise. Power consump tion is 20 watts. LOADING THE RECORD CHANGER 1. Pull straight up on the record pressure arm until the record pressure arm clears the spindle. Swing the record pressure arm towards the front of the changer until pins

8、 in pressure arm shaft (1) drop into locating slot on record pressure arm housing. 2. Changer will automatically play ten 12 either stand ard or Long Play, ten 10 either standard or Long Play or I ten 7 Long Play or Fine Groove records. NOTE: Standard, Fine Groove and Long Play records cannot be pla

9、yed in the same stack of records. Speed change lever (24) must be re-set for each type of record ing. (Continued on the next seven pages) 171 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS ZENITH Record Changers Models S-14053 to S-14057, continued 3. Place records on spindl

10、e and lower them to offset To play 33-1/3 RPM records: shelf. Level records and replace record pressure arm (1) over spindle and lower this until it rests on the top of the Motor speed change lever (24) must be in 33-1 3 record stack. position. To play standard 78 RPM recordings: 1. Motor speed cont

11、rol lever (24) must be set to 78 posi tion. This will set the record changer to proper speed posi tion and cause the turntable to rotate. 2. Set-up lever (33) must be moved to the size records being played. 3. Place the changer in cycle by depressing record change switch knob (37). The changer will

12、play the remaining records automatically. The changer will continue to play the last record until speed change lever (24) is moved to OFF position. 2. Set-un lever (33) should then be moved to either 12, 10 or 7 position depending on the size record being played. To play Fine Groove (45 RPM) records

13、: 1. Speed change lever (24) should be moved to 45 posi tion and set-up lever (33) should be in 7 position. It must be remembered that these records are manufactured with a IV2 spindle hole so it is essential that a record adapter be inserted into each 45 RPM record to be played. This is necessary t

14、o reduce the spindle hole to conventional size. 172 7777-777T V (S3) Q4) Q5) (l6) (n8) (T7) ) (2l) (22) (23) W S-14054Record Changer Top View with Turntable Removed 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS ZENITH Record Changers Models S-14053, etc., continued REJECTIN

15、G STOPPING To turn off the record chang r all that is required is to move the speed shift lever (24) to OFF position. UNLOADING To reiect a record anytime, while the changer is operating, _ . , J j , J j . T.L- Lift the record pressure arm (1) and swing it to the front deoress record change switch b

16、utton (37) and release. Inis . , r. . UT , * * ) . ._ . until the pin on the shaft drops into the locating groove will automatically cause the record changer to go through . “i v . , , . . on record pressure arm shaft housing. Lift stack of records cycle and begin playing the next record. straight u

17、p oij spindle. ) (go) (79) (p) (77) 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS ZENITH Record Changers Models S-14053 to S-14057, continued MANUAL OPERATION To play single records or home recordings, lift up the rec ord pr ssure arm and turn it toward the front of the cha

18、nger. Place record on spindle and lower to the spindle shelf. Gently push record towards record pressure arm shaft and lower to turntable. Move speed change lever (24) to proper speed for type of record being played and move set up lever (33) to manual position Pick up tone arm and place the needle

19、on the lead-in groove of the record. DESCRIPTION OF CYCLING The motor shaft contacts drive wheel assembly (38) and causes it to rotate by friction contact with its rubber sur face. Drive wheel assembly (38) drives idler wheel (10). The underside of the turntable is in contact with idler wheel (10) a

20、nd is driven in this manner. Speed of the turntable is controlled by changing the position of the idler wheel (10) on drive wheel (38). When idler wheel is moved to the center of drive wheel (38) it will rotate more slowly than when moved to the outer edge. In this manner the turntable can be driven

21、 at any speed from 10 to 85 RPM. Minor adjustments for proper tonal pitch can be made by simply moving speed change lever (24) back and forth to compensate for turntable speed which may vary due to line voltage changes. When record change button (37) is depressed it energizes solenoid (78) which the

22、n attracts trip pawl assembly (74). The same thing occurs when the forward movement of the tone arm c auses friction lever and weight assembly (68) to contact the silver plated contact on trip switch assembly (69). When gear segment (119) is released, gear pawl spring (42) causes the gear segment (1

23、19) to engage the rotating pinion gear under the turntable thus causing clutch as sembly (47) to rotate. As clutch assembly (47) rotates, tone arm lift lever (56) swings in such a manner that it contacts tone arm lift pin and raises the tone arm. Simultaneously, tone arm link and stud assembly (66)

24、slides towards, and contacts one finger of tone arm lever assembly (59) forcing the tone arm to wards the outer edge of the turntable and then on its re turn swing contacts the other finger of tone arm lever as sembly (59) swinging the tone arm back over the records. The position to which it swings

25、the tone arm over the rec ords is determined by the position of record size- discrim inator (64). There are three steps on the record size dis criminator (64) which determines set-down position for 7, 10 and 12 records. The tone arm lift lever (56) re turns and releases brake lever assembly (60) whi

26、ch keeps the ton arm from moving erratically during cycle. Simul- tan ously, ejector lever and link assembly (42) rotates and this in turn causes the spindle shaft to rotate and the ejector cam to push the record off the spindle shelf. Oper ation of the tone arm set-down adjustment can be ob served

27、by raising the tone arm so the adjustment mech anism can be viewed. VELOCITY TRIP This changer is provided with what is commonly known as a velocity trip rather than a ratchet and positive trip mechanism. A velocity trip depends for the tripping ac tion on the rate of forward motion of the pickup ar

28、m with respect to the turntable rotation. The changer will trip only when the tone arm advances more in one revolution SPEED INDICATOR ADJUSTMENT MODELS S-14054 & S-14057 It is possible that the speed of the record changer may not conform to the speed stop on escutcheon (23). Proper ad justments can

29、 be made in the following manner. Put a stroboscopic disc on the turntable, adjust speed change lever (24) until the turntable is turning at exactly 78 RPM. Stop the record changer by pulling the AC plug, remove the turntable, loosen the two adjusting screws (18) , (19) and move speed change lever (

30、24) so that the point on the control knob indexes exactly at the 78 mark on the escutcheon. Then re-tighten adjusting screws (18), (19) and replace the turntable. The turntable should now rotate at exactly 78 RPM, however, as a precaution, again check with the stroboscope disc. On models equipped wi

31、th the built in stroboscope disc mechanism, it can be used instead of a disc placed on the turntable. Tone Arm Friction Lever Detail SET DOWN ADJUSTMENT When adjusting the tone arm for proper set-down on the edge of the record, move set-up change lever to 7 posi tion, place a 7 record on the turntab

32、le, turn the record changer through cycle by rotating the turntable by hand. Watch closely where the needle point of the Cobra cart ridge lands on the record and adjust tone arm set-down adjustment screw (10$) until proper landing position is obtained. 174 Tone Arm Set-Down and Height Adjustments MA

33、NUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS ZENITH Record Changers Models S-14053 to S-14057, continued TONE ARM HEIGHT ADJUSTMENT SPINDLE The tone arm height adjustment determines vertical rise The spindle on this record changer is composed of five of the tone arm. If the tone arm does not rise s

34、ufficiently separate parts. Spindle shaft and ejector cam are pressure- it will not play a full stack of twelve records. On the other fit together and if either breaks, they cannot be replaced hand, if the tone arm raises too high it may hit the rec- since their assembly is a machine operation. The

35、spindle ords resting on the record shelf. Set the tone arm height housing is composed of two separate portions which once adjustment screw (105) so that the needle clears twelve again are pressure-fit together and require a machine oper- unwarped records on the turntable. The tone arm housing ation

36、for assembly. It is possible that spindle cap (101) must not hit the wider side of the records on the record may be pulled off spindle assembly (102) and if this does shelf when the changer is cycled after adjustment. occur, it can easily be replaced by sliding a new spindle cap down over the spindl

37、e and then pressing in on the detent portion, which acts as a stop to keep the spindle cap from sliding off. If breakage occurs other than loss of the spindle cap (101), the entire spindle assembly (102) must be replaced. TRIP CONTACT ASSEMBLY For proper automatic rejecting, silver contact No. 2 on

38、trip switch assembly (69) should be in proper relation to silver contact No. 1 on friction lever (68). The adjustment should be made with the record changer resting on the side nearest to the idler wheel and trip assembly (38). The turntable should be rotated sufficiently to move oscillat ing lever

39、(3) and stud to its maximum upward travel. The distance between the silver contact No. 1 on the friction lever (68) and silver contact No. 2 on trip switch (69) should be 1/16. If the distance is greater or less than 1/16, the support for the silver contact on trip switch as sembly (69) should be be

40、nt until this 1/16 gap is at tained. SILVER CONTACT SILVER CONTACT ()-_ SUPPORT FOR SILVER CONTACT STUD ON OSCILLATING LEVER ASSEMBLY Trip Contact Adjustment Spindle S-19926 LEVELING THE RECORD CHANGER It is essential to have the record changer absolutely level. Use either a torpedo or similar type

41、level on the record changer base plate. Use adequate shims to level the rec ord changer pan or the combination cabinet to achieve perfect level. DIAG. PART No. No. DESCRIPTION Tone Arm NOTE! R2 ft PL I NOT USED IN MODELS S-14054ft S-14057 141-129 Phono Motor_ 141-131 Phono Motor (Exp. 50-60Cyc.) 141

42、-132 Phono Motor (Alt. for 141-129) 22-829 .05 Mfd 200V 22-829 .05 Mfd 200V 22-1775 .047 Mfd 400V 58-213 2 Prong Plug 58-212 Connector Plug 100-160 Neon Lamp - GE No. NE54 63-1774 100 Ohm /iW 63-1849 33K Ohm /jW 63-1849 33K Ohm /jW 85-527 S.P.S.T. Switch 85-482 S.P.S.T. Switch PLUG WIRING FOR S-140

43、56 S-X3913 Electro Magnet Assembly 65-483 Phono Reject Switch_ S-16933 Trip Switch Assembly PLUG WIRING FOR 3- 14054 ft S-14057 C2 OR C3 05 .047 Wiring Diagram 175 MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS ZENITH Record Changers Models S-14053 to S-14057, continued MOTOR AND MOUNTING MECHANISM

44、 The motor (83) is shock mounted by the means of rubber drive shaft and dnve wheel (38) The drive wheel (38) is grommets (89) and fibre washers (90) to mounting plate firmly mounted in drive wheel bracket and bearing as- and stud assembly (92). The entire motor (83) and motor sembly and is pivoted o

45、n bearings at two points eliminat- mounting plate (92) revolve about motor mounting stud ing possible lateral motion. This reduces the possibility of (88). The point at which motor mounting stud (88) passes WOWS. When the record changer is in shipment, the through motor mounting plate should be well

46、 lubricated entire motor and bracket assembly (92), (83) is fastened to allow free action of the motor. The motor drive shaft is to a second point by motor mounting screw (118). This kept in contact and in onstant pr ssure with drive wheel eliminates the possibility of indentations forming in drive

47、assembly (38) by the means of motor tension spring (84). wheel (38) as a result of constant pressure and pounding This insures the proper friction contact between the motor of the motor drive shaft during shipment. TURNTABLE S-19920 There is little possibility of any damage occurring to the There is

48、 a possibility that the rubber turntable pad (99) turntable through normal usage. However it is possible may become damaged, if this occurs it can be replaced by that the turntable may be removed and dropped thus removing the defective pad and glueing the new one on damaging the gear so that it will

49、 have to be replaced, in the turntable plate, this case the entire turntable (100) should be replaced. 176 MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS ZENITH Record Changers Models S-14053 to S-14057, continued TROUBLE SHOOTING | c. Impression on idler wheel. NEEDLE DOES NOT TRACK ACROSS RECORD PROPERLY a. Clean foreign material from around needle. b. Check needle to see if the tip is bent or broken. Replace needle. c. Hinge bearing binds. Check lateral movement