Admiral-RC550GA 电路原理图.pdf

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1、MANUAL OF 1952 MOST-OFTEN-NEEDED RADIO DIAGRAMS Admiral RC550. RC550A. RC550GA RECORD CHANGERS Record Changers RC550, RC550A and RC550GA are identical, except for differences in length of connecting leads and color of plastic trim. Record Changers RC550X and RC550AX are used in export sets. REJECT K

2、NOB HEAD assembly 10-INCH CENTERPOST ARM FOR 7-INCH RECORDS RECORD SUPPORT RECORD SIZE AND SPEED SELECTDR KNOB Figur* 1. RC550 Record Changer, Top View. INCH EXTEXSION ARH feal OPERATING INSTRUCTIONS SETTING THE SIZE AND SPEED SELECTOR KNOB: The available record sizes (7, 10, 12) are engraved under

3、the three different speeds (33, STD, 45) on this knob. Rotate the knob until the size of record to be played (under the proper speed), lines up with the indicating dot on the changer pan. (Note that no size number is en graved under “45” since only 7-inch 45 RPM records are available.) SETTING PUSH-

4、OFF ASSEMBLY: Pivot the Push-off assembly toward the centerpost to play 10-inch records and away from the centerpost to play 12-inch records. For 7-inch records, place the Push-off assembly in the 10-inch position and move the extension arm toward the centerpost. LOADING AND STARTING: Place a stack

5、of records over the centerpost so that they rest on the record support (64) and the centerpost offset. Records must be the same size and speed. If 10 or 12-inch records are being played, place the re cord clip on the stack. The record changer is turned on by placing the function switch on the radio,

6、 in the “Phono” position. REJECTING A RECORD: If the record changer will not trip into change cycle at the end of a record, or if you wish to stop playing a record and start playing the next one, merely rotate the reject knob to the left momentarily. STOPPING AND UNLOADING: Do not turn the record ch

7、anger off during change cycle. Turn the phono motor off by turning the function switch on the radio to the center position. 45 RPM ADAPTER: An adapter must be inserted into the center hole of the 45 RPM records in order to play them with this changer. CHANGE CYCLE If at all possible, we recommend th

8、at you care fully observe the change cycle of a record changer which is operating properly. It is a good idea to rotate the turntable by hand and repeat the change cycle until the function of each part is understood. The changer operates as follows: The turn table is driven by the motor idler wheel

9、(48), rid ing against its inside rim. The speed of the turn table is determined by the diameter of the drive shaft (either 78 RPM, 45 RPM, or 33 RPM) which rides against the idler wheel rubber tire (48). The 78 RPM drive shaft is part of the motor armature. The 33 RPM drive shaft (44) and the 45 RPM

10、 drive shaft (45) are moved in and out of position mechanically by the motor shift link (84), which is controlled by the selector cam (89). See figure 4. Material on Admiral RC500 Changer continued on pages 12 to 18. 11 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1952 MOST-OFTEN-NEEDED RADIO DIAGRAMS Admiral

11、RC500, RC500A, RC500GA Record Changers, continued. TRIP SLIDER (36) LUG ON TURNTABLE HUB r-TRIP FRICTION WASHER (34) ENGAGES PAWL TO HOVE DRIVE GEAR j ENGAGEMENT . pawl (33) Figure 2A. Drive Gear Position Out of Change Cycle. The changer mechanism is driven during its change cycle by the drive gear

12、(30), which in turn is driven by the geared hub of the turntable. Dur ing normal record play, the “dead spot” on the drive gear is held next to the turntable hub by the gear indexing arm (41) and spring (39). This changer employs a velocity trip, which consists primarily of two parts: the trip motio

13、n arm (32), and the gear engagement pawl (33). These parts are mounted near the “dead spot” on the drive gear. See Figure 2A. During normal record play, the trip slider (36) is moved slowly by the stud on the arm control lever (23) which moves with the tone arm. The stud on the trip slider (36) ride

14、s against the trip motion arm (32), moving it very slightly. Since the gear engagement pawl (33) is held against the trip motion arm (32) by the trip friction washer (34), the gear engagement pawl (33) is also moved slightly toward the turntable hub. Since Figure 2B. Drive Gear Pawition During Chang

15、e Cycle. this movement is only slight, the vertical catch on the gear engagement pawl (33) is just touched and “kicked away” by the lug on the turntable hub. This occurs with each revolution of the turn table until the gear engagement pawl is moved in rapidly enough to be positioned in front of the

16、lug before the next turntable cycle. This rapid movement only occurs when the trip slider (36) is moved rapidly, by the tone arm, as the needle enters the trip grooves of the record. The gear engagement pawl (33) then moves in front of and engages the lug on the turntable hub. This causes the drive

17、gear (30) to be rotated far enough so that the teeth on the drive gear will engage the teeth on the turntable hub, starting the change cycle. See figure 2B. The changer can also be tripped by rotating the reject knob to the left momentarily. The stud on the end of the reject arm (88) moves the gear

18、engagement pawl (33) into position to engage the lug on turntable hub. Fig. 3. RC550 Record Chonger with Turntable Removed. For Individual parts detail, see Figure 9, RC550 Recard Changer, Expladed View. TRIP_FR1CTJ0N WASHER 34 收音机爱 好者资料库 RadioFans.CN MANUAL OF 19S2 MOST-OFTEN-NEEDED RADIO DIAGRAMS

19、Admiral RC500, RC500A, RC500GA Record Changers, continued. As the drive gear begins to rotate, the control cam (90) also rotates, since both parts are mounted on the same shaft. See fig. 4. As the control cam rotates clockwise, drive link roller (109) riding against the cam moves the drive link (107

20、), which in turn rotates the control plate (102). As the control plate rotates, the incline tab (102A) rides across the tone arm lift rod (12), lifting the tone arm from the record. The stud on the arm control lever (23) then is engaged by the safety arm (105) (which rotates with the con trol plate)

21、, moving the tone arm away from the centerpost. When the tone arm is almost clear of the record, the stud on the push-off link (86) (which is pivoted by the control cam), pivots the push-off arm (79) counterclockwise. Since the push-off arm is held to the push-off plate and shaft (60) by two Allen s

22、crews, the push-off plate is also pivoted. Just before the control cam reaches half rotation, the tone arm will be positioned as far as possible from the centerpost, and the push-off plate (60) will “push-off” the record to the turn table. SCREW Tl7/CONTOUR OF i VS- SUPPORT i MATCHES CONTOUR / RECOR

23、D OF RECORD. ff SUPPORT (64) / PUSH-OFF IN lO-IHCH POSITION- RECOHO SUPPORT(64)- CEHTERPOST OFFSET (24iI)t f Figura 7. Positioning Rcord Support with 10-ineh Rcord. SERVICE AND REPAIR LUBRICATION DO NOT apply grease or oil to the trip slider (36). Also, under normal operating conditions, the motor s

24、hould never require oiling. Friction can sometimes be increased between the gear engagement pawl (33) and the trip mo tion arm (32), by placing a small amount of Lubri- plate #110 between these two parts. Ordinary Vaseline can generally be used as a substitute for Lubriplate #110. The rest of the ch

25、anger should be lubricated with grease (such as Lubriplate #107) whenever it comes into the shop for repair or adjustment. A good automobile chassis grease can be used for this purpose. All pivot and friction points should be greased. The powdered iron roller (109) and oilite bear ings (used in the

26、turntable hub and tone arm base) may be lubricated with SAE No. 20 oil. REMOVING AND REPLACING TURNTABLE To remove the turntable, first remove the turn table retaining clip (51). Be sure that the chang er is not in change cycle, and then, grasp the turn table by its edges and lift up. Before replaci

27、ng the turntable, make sure that the changer is not in change cycle. The pickup arm should be posi tioned away from the turntable. In replacing the turntable, force is not needed to seat it. Make cer tain, however, that the idler wheel of the motor has been pushed in towards the centerpost and that

28、the idler wheel is making contact with the inner side of the turntable flange. The idler wheel should be pushed in with a screwdriver or similar flat tool. Do NOT push toward the rear of the changer. Figure 8. Checking Distance from Centerpost to Record Support. REPLACING THE PUSH-OFF INDEX PLATE (7

29、7) Position the push-off index plate (77) as shown in figure 10. Be sure that the Allen screw which is called out “falls into” the milled slot. Figur 10. Instolling Push-OfF lndx Plat. REPLACING SELECTOR CAM (89) When replacing the selector cam (89), place the size and speed selector knob (26) so “S

30、TO-IO” lines up with the indicating dot, hold the selector cam in the position shown in Figure 4, and install. REPLACING CONTROL CAM (90) Before replacing the control cam (90), be sure that the changer is out of change cycle. Place the control cam in the position shown in Figure 4, and install. REPL

31、ACING THE PUSH-OFF ARM (79) Place push-off arm (79) over the push-off shaft so that the Allen screw which is called out below fits against the “flat section” of shaft. Figure 11. Installing Push-OfF Arm. IS MANUAL OF 1952 MOST-OFTEN-NEEDED RADIO DIAGRAMS Admiral RC500, RC50QA, R( No. Part No. Descri

32、ption 1 /403C51 Tone Arm (Maroan) 403C51 G Tone Arm (Gold) /409A13-1 Pickup Cartridge with needle (push-in type) 409A13 Pickup Cartridge with needle and knurled nut Cortridges (with needle) are interchangeable 98A54-2 Knurled Nut (for 409A13 Cartridge) /98A15.18 Needle for 409A13-1 Cartridge 98A15-1

33、9 Needle far 409A13 Cartridge 4 1A72-1-20 Cartridge Mtg. Screw ShokeprooF type 25 (2 req.) 5 G400A529 Tone Arm Lead and Pin Jack Assembly 6 45-750-C2-47 Set-Down Adjusting Screw, ijf4-40 x% BH MS 7 405A137 Set-Dawn Adjusting Lock Spring 8 G400A526 Tone Arm Mtg. and Pivot Plate Assembly 9 2810-5-59 S

34、peed Nut (2 req.) 10 404A31 Tone Arm Counterweight n 1A70-6-20 Counterweight Retaining Screws, (2 req.) 12 G400A520 Lift Rod and Plate Assembly 13 405A120 Lift Adjusting Spring 14 402A245 Lift Adjusting Screw 15 414A43 Pivot Shaft 16 G40OA525 Tone Arm Support and Hub (includes set screws) 17 1A43-14

35、 Allen Set Screw, )|f8-32x3/l6 (3 req.) 18 402A247 Allen Set Screw, #8-32x/4 (3 req.) 19 401A355-3 Retaining Ring 20 /403A52 Tone Arm Plastic Base (Maroon) 403A52 G Tone Arm Plastic Base (Gald) 21 401 A3 58 Spocer Washer 22 401A284 Bronze Washer (.316 x 15/32 x ,005) 23 G400A542 Arm Control Lever an

36、d Shaft Assembly 24 G4008505-1 Centerpost 25 13A2-8-57 Snap-in Buttons 26 /403A59 Size ond Speed Selector Knob (Maroon) 403A59G Size and Speed Selector Knob (Gold) 27 /G400A582 Reject Knob (Maroon) G400A582G Reject Knob (God) 28 415A11 Thrust Bearing 29 401A355-1 Retaining Ring 30 G400A532 Drive Gea

37、r and Stud Assembly 31 402A229 Trip Pivat Stud 32 401A351-1 Trip Motion Arm 33 401A352 Gear Engogement Pawl 34 401A353 Trip Friction Washer 35 481-68-47 Washer (5 req.) 36 G400A575 Trip Slider 37 481-67-47 Wosher (.196 X 5/16 X l/32) 38 482-178-0 Washer (.196 x % x 1/64) 39 405A134 Gear Indexing Spr

38、ing 40 405A22 Spring Wosher 41 G400A549 Gear Indexing Arm and Stud Assembly 42 98A15-9 Oil Retaining Felt Washer (2 req.) 43 406A20 Drive Belt (2 req.) 44 98A15-11 45 RPM Drive Shaft (60 cycles) 45 98A15-10 33 RPM Drive Shaft (60 cycles) 46 405A15 Idler Wheel Retaining Clip 47 412A30 Fibre Washer (2

39、 req.) 48 G400A279 Idler Wheel Assembly 49 98A15-21 Idler Wheel Tie Lug 50 98A15-20 Idler Wheel Spring 51 414A36 Turntable Retaining Clip 52 G400B507 Turntable 53 /G400A511 Record Clamp and Shoft and Rubber Tips (Maraon) G400A51 1 G Record Clamp and Shaft and Rubber Tips (Gald) 54 406A25 Record Clam

40、p Rubber Tip (2 req.) 55 /403B53 Push-ofF Plastic Cap (Maroon) 403B53 G Push-ofF Plastic Cap (Gald) 56 402A249 Push-ofF Plate Nut 57 401A326 7* Record Support Detent Spring 58 G400A510 7 Record Support 59 415A28-1 Boll Bearing (Vk diameter) 60 G400A509 Push-ofF Plote and Shaft Assembly *407819 motor

41、 is not used on Canadian Admirar chong- UL For Conodion Admiral replocement motors order: lef. No. Part No. Description 61 402A250 Spocer Washer 63 402A262 Screw, #4-40 x5/16 BH MS (Includes lockwosher) 64 G400A508 Record Support and Tube Assembly 65 1A72-2-20 Screw, Shakeproof type 25 (#4x5/16) 66

42、405A136 Record Clamp Spring 67 481-158-47 Washer (.390 x9/10 x1/32) 68 /403C50 Push-ofF Housing (Maroon) 403C50G Push-ofF Housing (Gold) 69 401A346 Housing Bottom Plate 71 402A263 Plastiscrew, #6x5/8 R.H. (includes lock wosher) 72 402A258 Hold Dawn Screw, #10-32 x IA (for shipping only) 73 AA210 Mou

43、nting Screw ond Washer (table models only) 74 405A139 Floot Spring (3 req.) 75 G400A565 Push-ofF Positioning Arm Assembly 76 414A40 Push-ofF Indexing Spring 77 G400A514 Push-ofF Index Plate and Hub Assembly See Replocing The Push-OfF Index Plote (77) on page 8. 78 405A133 Push-ofF Return Spring 79 G

44、400A517 Push-ofF Arm and Hub Assembly (includes Allen screw) See Replacing The Push-OfF Arm (79) on page S. 80 *407819 *3-Speed Motor Complete, 60 cycle, 117 volts 81 406A19 Motor Mounting Grommet (3 req.) 82 401A355-4 Motor Mtg. Retaining Ring (3 req.) 83 88A8-1 Phono Motor Plug 84 G400A580 Motor S

45、hift Link (includes rubber grommet) 85 406A24 Speed Change Link Grommet 86 G400A562 Push-ofF Link and Stud Assembly 87 405A140 Reject Return Spring 88 G400A581 Reject Arm and Stud Assembly 89 4018359 Selector Cam, When replocing, see Replacing Selector Com (89) 90 G400A548 Control Cam and Stud Assem

46、bly See Replacing Control Com (90) on poge 15. 91 401A145 Control Cam Washer 93 402A265 Screw, #8/32x% BH (includes lock washer) 94 481-78-47 Washer (.196x1/2x1/16) 95 402A254 Selector Cam Stud 96 401A355-3 Centerpost Retaining Ring 97 G400A579 Set-Down Change Lever 98 405A130 Set-Dawn Spring 99 G40

47、0A546 Set-Down Change Plate and Arm Assembly 100 402A238 Spacer 101 1A70-11-20 Plastiscrew, # 6 x 7/16” 102 G400A537 Control plate Assembly 103 401A173 Washer 104 401A355-2 Retaining Ring 105 401A345 Safety Arm 106 405A131 Safety Spring 107 G400A538 Drive Link and Stud Assembly 108 405A132 Control P

48、late Return Spring 109 415A27 Drive Link Roller 110 403A38-1 plastic Trim (2 req.) 111 32A88 Antenna Lead Support 112 2810-10-59 Speed Nut (4 req.) 113 27A24 Bottom Caver Bushing (4 req.) 114 Bottom caver 115 413A11-1 Shielded Cable (includes plug, 15) 116 88A2-3 plug (far lead-in cable) 117 1081-18

49、 Terminal Board 118 Changer Pon 119 415A28-2 Ball Searing (5/32 diameter) 120 412A36 Fibre posher (.196 x % x .005) 121 414A45 Tone Arm Weight 122 481-19-47 Washer (.125 x 14 x 1 /32 Steel) 123 412A38 Motor Mounting Wosher 124 402A264 Screw, #6-32 x3/l6 BH PARTS FOR 45 RPM Drive Shaft 78 RPM Drive Shaft 33 RPM Drive Shaft CONVERTING 407B19 MOTOR TO SO CYCLE (50 cycles)