Admiral-RC600 电路原理图.pdf

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1、SPEED SELECTOR Adi RC600 RECORD CHANGER CENTER POST LEVELING ARM TORE ARM Figure 1. RC600 Record Changer, Top View. This Admiral record changer will automatically play- twelve of the 10-inch, 78 or 33 RPM records, or ten of the 12-inch, 78 RPM records, or twelve of the 12-inch, 33 RPM records, or fo

2、urteen of the 7-inch, 45 RPM records, or ten of the 7-inch 33 RPM records. The push-off is built into the record changer center- post and operates automatically during the regular change cycle. The tone arm set-down point is automatically selected during change cycle immediately after the first reco

3、rd drops to the turntable. The set-down index finger at the edge of the turntable rises momentarily to determine the correct set-down position for the tone arm. SETTING THE SPEED SELECTOR KNOB: Correct turntable speed may be selected by sliding the speed selector pointer to the position indicated fo

4、r 33, 78 or 45 RPM. See figure 2. SPEED SELECTOR POINTER LOADING AND STARTING: Remove needle guard which protects phonograph needle during shipment. Se lect a stack of records of same size and speed. Grasp the leveling arm at the shaft end and lift it to clear the top of the centerpost. Swing the le

5、veling arm toward the tone arm where it is out of the way of records. Figure 2. RC600 Record Changer Control Panel. Figure 3. Loading Records. Place the stack of records on the centerpost. Then, swing the leveling arm back over the centerpost and lower it on the record stack with the centerpost exte

6、nd ing up through the opening. See figure 3. 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 slide the reject pointer to the “REJ” position momentarily. STOPPING AND UNLOA

7、DING: Do not switch off the record changer or handle the tone arm during the change cycle. This record changer may be stopped manually only after the changer is out of change cycle and has begun playing a record. The tone arm may be carefully lifted off the playing surface of the record and placed o

8、n the tone arm rest at the side of the changer pan. Slide the reject pointer to the “OFF” position to stop the turntable. To restart, repeat procedure described for starting and operating the record changer. This record changer will automatically switch off power to the turntable motor after the las

9、t record has played and the tone arm returned to the tone arm rest. Grasp the leveling arm at the shaft end and lift it to clear the top of the centerpost. Swing the leveling arm toward the tone arm where it is out of the way of rec ords. Lift the stack of records off the centerpost. (Continued on t

10、he next 7 pages.) | 收音机爱 好者资料库 RadioFans.CN MANUAL OF 19S3 MOST-OFTEN-NEEDED RADIO DIAGRAMS ADMIRAL, Continued CHANGE CTCLE Model RC600 When following this change cycle, keep in mind that a velocity type trip is used, which depends upon a rapid movement of the tone arm toward the centerpost. Note th

11、at the Push-off, Trip, and Set-Down mechanisms function independently. If. at all possible, 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 chang

12、er operates as follows: The turntable is driven by the motor idler wheel (56), riding against its inside rim. The speed of the turntable is determined by the diameter of the shaft (either 78 RPM, 45 RPM, or 33 RPM) driving the idler wheel rubber tire (56). The 78 RPM drive shaft is part of the motor

13、 armature. The 33 RPM drive shaft (51) and the 45 RPM drive shaft (52) are moved in and out of position mechanically by the speed selector link (34). See figure 6. The changer mechanism is driven during its change cycle by the drive gear (42), which in turn is driven by the geared hub of the turntab

14、le. During normal record play, the “dead spot” on the drive gear is held next tp the turntable hub by the gear indexing arm (39) and spring (40). VELOCITY TRIP This changer employs a velocity trip, consisting pri marily of two parts: the trip motion arm (44), and the gear engagement pawl (46). These

15、 parts are mounted near the “dead spot” on the drive gear. See figure 4A. During normal record play, the trip slider (49) is moved slowly by the stud on the tone arm control lever (64) which moves with the tone arm. The stud on the trip slider (49) rides against the trip motion arm (44), moving it v

16、ery slightly. Since the gear engagement pawl (46) is held against the trip motion arm (44) by the trip friction washer (47), the gear engagement pawl (46) is also moved slightly toward the turntable hub. Since this movement is only slight, the vertical catch on the gear engagement pawl (46) is just

17、touched and “kicked away” by the lug on the turntable hub. This occurs with each revolution of the turntable until the gear engagement pawl is moved in rapidly enough to position in front of the lug for the next turntable cycle. This rapid movement only occurs when the trip slider (49) is moved rapi

18、dly, by the tone arm, as the needle enters the trip grooves of the record. The gear engage ment pawl (46) then moves in front of and engages the lug on the turntable hub. This causes the drive gear (42) to be rotated far enough so that the teeth on the drive gear will engage the teeth on the turntab

19、le hub, starting the change cycle. See figure 4B. The changer can also be tripped by sliding the reject pointer to the “REJ” position momentarily. The stud on the end of the reject arm (35) moves the gear en gagement pawl (46) into position to engage the lug on turntable hub. ia As the drive gear be

20、gins to rotate, the drive eccentric (82) also rotates, since both parts are mounted on the same shaft. See figure 6. As the drive eccentric rotates clockwise, the drive link (75) pivots the control plate (71). As the control plate pivots, the inclined cut-out moves from beneath the tone arm lift rod

21、 (65), raising the tone arm from the record. The safety arm (73) travels with the control plate (71). The stud on the safety arm engages the tone arm control lever (64) and moves the tone arm away from the centerpost. PUSH-OFF When the tone arm is clear of the turntable, the roller on the drive ecce

22、ntric (82) engages the push-off link (84). The push-off link moves the push-off lever (85) which engages the push-off adjustment nut (92) on the end of the push-off shaft in the centerpost. As the push- off link is moved by the drive eccentric, the push-off lever moves the push-off shaft up into the

23、 centerpost. The push-off shaft engages the ejector and pushes it up and out at the shelf of the centerpost. See figure 9. As the ejector moves up, it engages the center hole of the record at the bottom of the stack on the shelf. As the ejector moves out of the centerpost, the record moves with it u

24、ntil the center hole is clear of the shelf of the centerpost. The record drops down the centerpost to the turntable. The balance of the stack of records is held on the shelf by the centerpost slide above the ejector. As the drive eccentric starts into the second half of the change cycle, the push-of

25、f return spring (93) re turns the push-off lever (85) and the push-off link (84) to proper position and permits the push-off ejector to return into position for push-off for the next record on the shelf of the centerpost. SET-DOWN After push-off and during the second half of the change cycle, the to

26、ne arm is returned to the edge of the record on the turntable. The tone arm is mounted to the tone arm control lever (64). The engagement spring (66) presses the tone arm control lever against the cork friction washer on the set-down arm (63). As the set-down arm return spring (68) draws the set- do

27、wn arm toward the centerpost, -the cork friction washer returns the tone arm control lever with the set- down arm. As the contrpl plate (71) is returned by the drive link (75), the inclined cut-out moves beneath the tone arm lift rod (65). As the tone arm lift rod descends into the inclined cut-out,

28、 the tone arm is lowered to the record. The SET-DOWN INDEX (69) automatically deter mines the correct set-down position of the tone arm for each record size. An index finger with a stepped rubber cap extends above the changer pan momentarily to de- 收音机爱 好者资料库 RadioFans.CN fTRIP FRICTION WASHER (41)

29、xym r* ENGAGES PAWL TO MOVE DRIVE GEAR J MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS w . , ADMIRAL, Continued . . , , , , , A AUTOMATIC SHUT-OFF termine the size of the first record to be played. An , , fl index pin on the set-down arm (63) Engages with the After the last record of the stack on

30、the shelf has been set-down index (69). As the long stud on the safety ejected to the turntable, the leveling arm (26) drops arm (73) moves the set-down arm (63), the index pin about 3/16 of an inch beneath the shelf. The bottom en on the set-down arm releases the set-down index and of the leveling

31、arm shaft extends beneath the changer permits it to pivot of its own weight and lift the index pan and will lower the shut-off delay stop (80). The finger to the edge of the turntable. shut-off link control arm on the shut-off link (76) is 6 . then permitted to pivot with the shut-off arm spring (77

32、) A 7-inch record cannot obstruct the index finger. fastened at its other end to the control plate (71). The Therefore, the set-down index will pivot its full distance shut-off link control arm will draw the shut-off link and to the position which will permit the index pin on the engage its cam that

33、 positions the shut-off link in line set-down arm to enter the proper index slot for 7-inch WQ1 the stud on the reject arm (35). set-down. The set-down arm return spring (68) draws , the set-down arm toward the centerpost and the index As the shut-off link (,6) is drawn toward the control pin on the

34、 set-down arm travels in to the end of the plate (71), the stop on the shut-off link moves into the index slot. Since the index pin is held in the index slot path of the stud on the tone arm control lever (64). against moving further toward the cen terpost, the index slot will determine _. where set

35、-down occurs. -TURNTABLE (33) A 10-inch record will extend past the edge of the turntable approximately l/z inch; the lower step of the index finger TURNTABLE*NUB cap momentarily “feels” the edge of the record. The index finger cannot rise as -J high as it was when no record obstructed its rise, thu

36、s the set-down index is posi- O tioned to permit the index pin on the set-down arm to enter the index slot for S 10-inch set-down. A 12-inch record extends approxi mately 1*4 inches beyond the edge of the turntable. Thus, the index finger iii* , , Figure 4A rises just slightly since the top step mo-

37、 Gear Out mentarily “feels” the record and the set- down index cannot lower enough to permit the index pin in either the slot for 7-inch or 10-inch set-down. As the set-down arm returns, the set- down index will hold the index pin in the proper posi tion for 12-inch set-down for the tone arm. TRIP S

38、LIDER (49) / TRIP MOTION f ARM (44) CEAR ENCACEMENT PAUL (16) . Position of Drive of Chonge Cycle. Figure 4B. Position of Drive Gear During Change Cycle. When the control plate (71) begins to return in the second half of the change cycle, a stud on the control plate moves the shut-off link (76) to s

39、nap off the phono graph motor switch (99) and return the control knob lever (23) to “OFF”. FOR INDIVIDUAL PARTS DETAIL, SEE FIGURE 11,“RC600 RECORD CHANGER, EXPLODED VIEW” KU SPOT 39 TRIP FBICTIOI USHER 47 35 IDLER HEEL SUM S7 S5 14 41 S3 71 11 44 / 69 14 IS5 5 71 4TRIP SLIDER RETSRR SPRIRt Figure 5

40、. RC600 Record Chonger with Turntable Removed. Figure 6. Bottom View, Changer Out of Cycle. 收音机爱 好者资料库 RadioFans.CN MANUAL OF 19S3 MOST-OFTEN-NEEDED RADIO DIAGRAMS ADMIRAL, Continued The tone arm control lever (64) is held by the tone arm stop on the shut-off link (76) while the control plate (71) i

41、s going through the second half of the Model RC600 change cycle; the tone arm is held suspended above the tone arm rest (29). As the inclined cut-out moves under the tone arm lift rod (65), the tone arm is lowered onto the tone arm rest. ADJUSTMENTS When making the following adjustments, keep in min

42、d that the Push-off, Trip, and Set-Down mechanisms function independently. VELOCITY TRIP MECHANISM This record changer uses a velocity type trip, which depends upon a rapid movement of the tone arm toward the centerpost in any area between 2% to % from the center of the record. This trip requires no

43、 ad justment. However, in order for the changer to trip properly, there must be sufficient friction between the trip motion arm (44) and the gear engagement pawl (46). Friction may be increased by placing a very slight amount of a silicone lubricanton the fibre washer (45). If necessary, replace the

44、 trip friction washer (47). See Figure 4A. SET-DOWN ADJUSTMENT The set-down adjustment may be made while the changer is in its compartment or cabinet. Adjustment of the set-down point is made by adjusting the set-down adjusting screw (6). See Figure 7. The tone arm will automatically set-down proper

45、ly on 7-inch or 12- inch records if the set-down adjustment is made properly-on a 10-inch record. The set-down adjust ing screw is accessible through the hole in the left side of the tonearm. Turning this screw out (counterclock wise) moves the set-down point of the tone arm closer to the centerpost

46、, and turning this screw in (clockwise) moves it away from the centerpost. Be sure the record changer is level. Make the set-down adjustment as follows: 1. Grasp the leveling arm at the shaft end and swing the arm from the centerpost to its stop above the tone arm rest. 2. Place a standard 10-inch,

47、78 RPM record on the turntable. 3. When operating the record changer out of its cabi net, the television line cord with the interlock socket (Admiral part number 89A22-1) may be used as an adapter for power at the phonograph motor plug. 4. Slide the reject pointer to the “REJ” position mo mentarily

48、and let it return to “ON”. The changer will begin its automatic cycle. Slide the reject pointer to the “OFF” position so that the turntable will stop after set-down has begun, but before the needle has touched the record. 5. Place a ruler against the centerpost and measure the distance between the n

49、ear side of the centerpost and the needle. This distance should be between 4-10/16 and 4-11/16. 14 6. When the 10-inch adjustment is correct, the needle should set-down between 5-19/32 and 5-22/32 from the near side of the centerpost on 12-inch rec ords, and between 34 to 3-5/32 on 7-inch records. 7. Check the set-down point with each size of record. “Touch-up” set-down adjustment until the set-down has been optimized for all record sizes. LIFT Figure 7. Set-Down ond Lift Adjustments. ADJUSTING THE TONE A