RCA-Victor-Co-Inc-V-221 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN MANUAL OF 1942 MOST POPULAR SERVICE DIAGRAMS RCA Rode Is V-215, V-219, V-221, V-225 A o LOOP AND PHONO. MOTOR CONNS V 219 (RC5S4-A) Cathode-Ray Alignment is the preferable method. Connections for the oscillograph are shown in the schematic diagram. Output Meter Alignment.If t

2、his method is used, connect the meter across the voice coil, and turn the receiver volume control to maximum. Test-Oscillator.For all alignment operations, connect the low side of the test-oscillator to the receiver chassis, and keep the output as low as possible to avoid a-v-c action. Electronic Vo

3、ltmeter.The electronic voltmeter in the Chanalyst or VoltOhmyst provides an unexcelled output indicator. It should be connected to the AVC bus, and the test-oscillator output adjusted to produce several volts of AVC. Calibration Scale.The glass tuning dial may be easily removed from the cabinet and

4、temporarily attached to the chassis for quick reference during alignment. In the event that only the chassis is returned for service, and the cabinet with its tuning dial is left in the customers home, the full size calibration scale printed in this service note can be used as an accurate and conven

5、ient substitute for the regular dial. Using Tuning Dial. 1. Remove the dial glass from the cabinet. 2. With gang at full mesh move the pointer to a point (1/16) inch to the left of the reference mark at the left hand end of the dial backing plate. 3. Place the glass dial under the pointer so that th

6、e extreme left sale graduations coincide with the pointer. Use scotch tape to hold the glass dial in place. Using Dial Scale Printed In This Service Note. Follow the procedure above, substituting the dial scale printed in this service note for the glass dial in the cabinet. Steps Connect high side o

7、f test osc. to Tune test osc. to Turn radio dial to Adjust the follow ing for maximum peak output 1 I-F grid in series with .01 mfd. 455 kc “A” Band 540 kc L12, Lll (2nd I-F Trans.) 2 1st Det. grid in series with .01 mfd. L10, L9 (1st I-F Trans.) 3 Y ellow loop lead in series with 200 mmf. (link clo

8、sed) 1,600 kc “A” Band 1,600 kc C9 (osc.) 4 600 kc “A” Band 600 kc L8 (osc.) 5 Repeat steps 3 and 4 6 Ant. terminal in series with 47 mmf. (link closed) 6.1 me “B“ Band 6.1 me C8 (osc.) * C2 (ant.) 7 16.2 me “C” Band 15.2 me C7 (osc.)* C6 (ant.) 8 9.5 me “C” Band 9.5 me C4 (ant.) 9 Repeat steps 7 an

9、d 8 10 Install and connect chassis in cabinet, with link closed. Tune in a radiated oscillator signal at 1,600 kc and peak the “A band ant. trimmer C3 (on loop). Rock in L8 for peak out put at 600 kc. * Use minimum capacity peak if two peaks can be obtained. Oscillator tracks 456 kc above signal on

10、all bands. Critical Lead Dress 1. Push button, R.F. and oscillator leads should be separated as much as possible to reduce degeneration on push button reception. 2. R.F. choke in plate circuit of 6SG7 should be dressed towards the back apron. 3. Dress green push button lead under clamp and away from

11、 “C” band series capacitor. 4. Dress heater leads away from grids and diodes. 5. Dress phono, cables up and away from all wiring. 6. Dress all excess leads from transformer towards back towards transformer. 7. Keep output plate leads short and dressed close to chassis. 8. Dress green lead from 6SA7

12、screen to electrolytic down close to chassis. 9. Dress “C” band coil lead from oscillator coil to range switch down towards green lead. 10. Keep yellow loop lead clear of all wiring. 11. Dress ground bus of large electrolytic away from mounting lug. 12. Remove all excess slack from pilot light assem

13、bly and dress it close to chassis base away from volume control. 13. Dress oscillator grid capacitor (56 mmfd.) up and away from the screen and plate of 6SA7 socket. 14. A C leads to “off-on” switch should be kept away from tone control cable to reduce hum. 15. Peaking coil should he dressed away fr

14、om R-F grid resistor to reduce degeneration in R-F stage. 16. Dress oscillator push button lead in weld clamp on front apron away from 220 mmf. series condenser. 17. Keep all leads away from Phono. FM jack to prevent audio oscillation and hum. Dress undernealh the shield provided. COMPILED BY M. N.

15、BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN RP -16o IT-1Fr1 RP -162 PAGE 737-C RP -158 RP -160, RP -161 and RP -162 IDENTIFICATION Automatic Record Changers RP -158 - Tone arm lands on rest after playing last record but motor does_ not shut off. Uses Stock No. 38610 crystal pickup. Button

16、type reject. - Tone arm lands on rest after playing last record. Automatic switch shuts off motor. Uses low -noise crystal pickup Stock No. 38453 or 39950 Lever type reject. - Adapted to home recording. Uses Stock No. 38610 crystal pickup. Tone arm lands on rest after playing last record but motor d

17、oes not shut off. Lever type reject. - Repeats playing of last record. Button type reject. RP -158 V-175 V-209 V-210 RECORD SUPPORT RECORDS CUTTER ARM CUTTER HEAD CUTTER ARM- REST SPINDLE Uses Stock No. MODEL vs RP NUMBERS RP -160 RP -158, RP -162 SPINDLE V-215 V-219 V-221 RECORD SEPARATOR MOTOR BOA

18、RD PICKUP ARM 7 PICKUP PICKUP REST TURNTABLE SWITCH RECORD SUPPORT MOTOR BOARD PICKUP ARM PICKUP BRACKET PICKUP REST INDEX ESCUTCHEON RECORD SUPPORT TURNTABLE SWITCH START - REJECT LEVER RP -161 Lubrication The drive motor bearing is lubricated from felt washers at the bottom and top. A light machin

19、e oil should be used at these points. On all bearing surfaces except the motor bearings Hough- ton Stayput No. 320 should be used. On all other surfaces Lubriplate No. 110 is recommended. It is important that the drive motor spindle and the rubber tire on the idler wheel be kept clean and free from

20、oil, grease, dirt, or any foreign material at all times. Any quick drying naphtha is satisfactory for cleaning these parts. 38610 crystal pickup. RP -161 RP -162 VHR-212 V-135 V-140 R -566P RECORDS SPINDLE RECORD SUPPORT MOTOR BOARD PICKUP ARM PICKUP PICKUP REST STOP SWITCH RECORD SUPPORT / TURNTABL

21、E SWITCH START -REJECT LEVER R-801 RP -160 This mechanism is designed to play a series up to twelve 10 -inch, or ten 12 -inch records of the 78 r.p.m. type. It will also play single records of any diameter up to 12 inches. Cautions Before servicing the automatic changer, inspect the assem- bly to se

22、e that all gears, cams, springs, levers, etc., are cor- rectly assembled and in good working order. 1. Never use force to start or stop the motor or any part of the record changing mechanism. 2. Warped or damaged records may cause the mechanism to jam. When jamming occurs, the safety clutch slips, c

23、ausing a clicking sound. 3. A cracked or chipped record may damage the sapphire. 4. Warped records may slide on one another while play- ing and result in unsatisfactory reproduction. .5. Do not leave the records on the record posts or on the turntable as they may warp, particularly in warm climates.

24、 Warped records may be flattened by placing them on a flat surface with a heavy flat article placed on top of them for a few days. 6. If, for any reason, the mechanism stalls, turn off the turntable switch and remove the records from the posts. Start the turntable by turning the switch on and allow

25、the pickup arm to complete its cycle. 7. Do not tighten copper plated, cone -pointed screws until final adjustment has been made. RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. A. 收音机爱 好者资料库 RadioFans.CN PAGE 738-C RP -I58, RP -I60, RP -I61, RP -I62 RECORD SEPARATOR MAIN CA

26、M LEVER LINK CRAN K E RECORD SEPARATOR SHAFT TONE ARM SEGMENT- CAM RECORD SEPARATOR BELT DRUM RECORD SEPARATOR SWIVEL SHAFT TONE ARM ELEVATING ROD _- - TRIP LEVER 16 AND GEAR TONE ARM LEVER STUD TONE DRIVE CAM / (. TIMING , DRIVE CAM PAWL u, :. =- ,- n Turntable does not turn freely. (Turntable Bott

27、oni Bearing Position) Loosen the bottom bearing screws B and position the bottom bearing plate until the turntable 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.

28、 Bin iiCii POSITION / /ADJUSTMENT OF 10, RECORD AT 1a _ i 2 Records strike sea -22 rotor post or fail to stay on record 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 m

29、otorbtiard and turn the belt drum to take up any slack it the belt. Tighten the zinc -plated, blunt- nosed screw and 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, b

30、y changing the support post to take the twelve -inch record, and turning the eccentric stop until the edge of the 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

31、 12 SHELF Records do not dropthe at proper time. (Record Shelf Tim- ing) SIDS Place a ten -inch record on the posts. 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

32、circumference of the knife should be resting in the bottom of their slots at the time the adjustment is made. Tighten 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 sh

33、aft spring. RECORD SEPARATOR di9-= AND SWIVEL I , rf F=t 7 ; ; ;i W SEGMENT 1 ;e,= E +i INDE% FINGER ON TONE ARM RETURN 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. Loo

34、sen the set screw E. Set the record separator segment so that the index finger of the pickup arm return lever rides 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

35、over top of the cam when the record shelf is depressed by the weight of one record. Tighten the set screw. INDEX FINGER 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

36、 dimension from outside edge of s i n d l e to sapphire 416 inches. Place a ten -inch record on the turntable and 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 t

37、he tone arm trip lever stud is held firmly against the return lever. Loosen the set screws F and move the pickup arm 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 thr

38、ough cycle several times as a check, then tighten the copper -plated screw. The twelve -inch landing position is automatically 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 cl

39、ear the records on the turntable. iv. (Pickup Arm Height WhileIn Cycle) Rotate the changer through cycle until the 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

40、is one and three -sixteenths inch. Tighten the locknut. PAWL STUD ,/TRIP MAINTAIN Y32 LEVER CLEARANCE i,=. -_ IN 23 ,(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

41、 in automatic po- sition. H (Control Cam Position) RP -180 Set the control lever to automatic. Loosen set screw H 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

42、 Shorting Switch) RP -180 Loosen screws J. Position the switch to obtain Y32 -inch clearance between the switch blades 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 ch

43、eck adjustment F. Do not tighten screws F too tightly or the hollow pivot shaft will be distorted. ARM TWISTED-, EXCESSIVE 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 CR

44、EWS LOOSE RATCHET LEVER TOO STRONG ROUGH OR BURRED DRII,E CAM P/WL BINDS ON DRIVE CAM BURRS LATCHET LEVER BINDS TONE 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

45、MISSING FEED IN SPRING BENT OUT TOO FAR BURRS OR BINDS BETWEEN LEVER ADJUSTMENT FEED - IN I_E VF R O iflMllllMlllllr0 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 -i

46、n tension can be adjusted by hooking the spring in a different hole on the bracket, and by bending the bracket. Bakelite 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 r

47、egular die -castings: Stock No. Stock No. Description Die -Cast Bakelite Record Separator Assembly: Separator cap 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,

48、 -161) 38652 39767 Separator shelf and shaft (RP -162) 39035 39770 Main Cant 38641 :39760 Record Support and Shaft (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 39763 and :19764 require a drive pin, stock number 39765, to fasten cam to shaft. (A drive pin is included wi