Philco-Radio-and-Television-Corp-M-24 电路原理图.pdf

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1、MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS PHILCO RECORD CHANGER MODEL M-24 DESCR PT ON OF OPERATING CYCLE At the completion changer trips, and allows the dog latch to engage the spur of the W 1 WtTVWWUL turntable hub gear. This rotates the cam gear, allowing f W the teeth of the cam gear and h

2、ub gear to engage. As the cam rotates, it forces the lifter lever down, raising ITfc. , . r TAW the tone arm from the record. As the tone arm reaches “Pi t Sf J | X maximum height, the tone-arm actuator, motivated by Ih V /W the cam gear, contacts the trip-arm stud and swings the 4w tone arm against

3、 the rest post. After the tone arm -J reaches the rest post, the push-off lever rotates, nodding the spindle and dropping the next record onto the turn- I table. After the record has dropped, the return lever contacts the stud of the trip arm, and starts the tone arm inward. The tone arm is now cont

4、rolled by the actuator and return levers, in contact with the stud _- of the trip arm. The return lever continues swinging tj,e trip-plate finger supporting the dog latch begins the tone arm inward until it is stopped by the set-down to move lessening the engagement of the trip-plate lever, whose po

5、sition is dependent upon the setting of finger and dog latch, preparatory to releasing the the record shelf. This stoppage of the inward travel o latch. This engagement is slowly lessened while the the tone arm by the established position of the return needle is in the playing grooves, giving the re

6、set cam lever accomplishes the set-down indexing. The tone an opportunity (once each revolution of the turn- arm is thus held above the set-down point. The lifter table) to reset the trip plate into full engagement and lever now moves upward, slowly dropping the tone sj.p tjl frjctjon finger into th

7、e friction clutch. As the arm to the record surface. As the cam gear continues to needle rides in the lead-out or eccentric groove of the rotate, the actuator lever is moved outward and away record, the velocity of the friction finger is increased, from the strip-arm stud. The tone-arm return lever

8、The speed of the disengagement of the trip-plate sup- then moves away from the trip-arm stud, but the porting finger and the dog latch is also increased suf- spring portion of the actuator momentarily remains in ficiently to allow complete disengagement of the dog ontact with the stud, preventing a

9、sudden release of iatch before it has been restored by the reset cam. the tone arm, which could cause the needle to jump ?“S SSrES adjustments locks the cam gear in a neutral position. The tone arm |Nm_e is now free to play the record. sriNULt As the tone arm advances toward the spindle, the The spi

10、ndle should be checked for perpendicularity friction-clutch trip finger engages the end of the trip (use square on turntable surface) when the changer is plate. Through the applied pressure of the friction out cf cycle. To adjust, bend the ear on the push-off- finger (approximately 2 grams) against

11、the trip plate, lever assembly; bending the lever toward the spindle the trip-plate finger supporting the dog latch begins to move, lessening the engagement of the trip-plate finger and dog latch, preparatory to releasing the latch. This engagement is slowly lessened while the needle is in the playi

12、ng grooves, giving the reset cam an opportunity (once each revolution of the turn table) to reset the trip plate into full engagement and slip the friction finger into the friction clutch. As the needle rides in the lead-out or eccentric groove of the record, the velocity of the friction finger is i

13、ncreased. The speed of the disengagement of the trip-plate sup porting finger and the dog latch is also increased suf ficiently to allow complete disengagement of the dog latch before it has been restored by the reset cam. ADJUSTMENTS SPINDLE The spindle should be checked for perpendicularity (use s

14、quare on turntable surface) when the changer is out of cycle. To adjust, bend the ear on the push-off- lever assembly; bending the lever toward the spindle spring, throws the top of the spindle away from the record shelf. This is shown in figures 3 and 6. RECORD SHELF POSITIONING AND /MOUNTING SCREW

15、S -SET-DOWN cam CLAMP SCREW - 12 EAR OF SET-DOWN CAM ECCENTRIC STUD 10*EAR OF CUPPED WASHER SET-DOWN CAM 8089 Figure 1. Record-Shelf Adjustment and 10-Inch, 12-Inch, and Fine Set-Down RECORD SHELF CAUTION: This adjustment must be made im mediately after a change cycle is completed. With the changer

16、turned to the OFF position, place a record-shelf gauge, Part No. 45-6647, on the record shelf. The edge of the gauge should fit snugly against the edge of the raised portion of the shelf. Remove all play without flexing the spindle. If the gauge does not fit properly, loosen the two saddle mounting

17、screws which hold the record shelf to the base plate (figure 1), and adjust the position of the record shelf. Then tighten the screws. (Continued on pages 90 to 96, inclusive) Reproduced through the courtesy of the Philco Corporation. CSC 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1953 MOST-OFTEN-NEEDED RADI

18、O DIAGRAMS Philco Model M-24, continued. record. Loosen the hex-head clamp screw on the trip TONE-ARM HEIGHT AND LIFT With the changer out of cycle, and the tone arm over the base plate, the needle point should be Vg inch % e inch above the base plate.- To adjust the clearance, bend the protruding e

19、ar of the swivel post, at the rear of the tone-arm heel. See figure 2. Bending the ear upward decreases the clearance, bending it downward increases the clearance Raise the tone arm to its maximum height, ant place it against the rest post. There should be approximately %2 inch clear ance between th

20、e lower edge of the tone arm and the top of the rest-post hook. Bend the ear of the swivel to obtain the most satisfactory adjustment of both the rest-post clearance and the base-plate clearance. VERTICAL TIMING Adjust the vertical timing by bending the end of the lifter lever (shown in figure 2), w

21、hich attaches to the pull-cord, so that there is approximately yS2 inch to record. Loosen the hex-head clamp screw on the trip arm (see figure 3), and swing the tone arm until the needle is Vg inch in from the edge of the record. Tight en the clamp screw, and check the adjustment by put ting the cha

22、nger through another cycle. If the set-down point is slightly incorrect, it may be corrected by means of the eccentric stud mentioned above. Recheck the needle set-down. The trip arm should be positioned vertically so that the friction finger is midway between the base plate and the lifter lever. Re

23、move the 7-inch record. Set the record shelf to the 10-inch position, and place a 10-inch record on the turntable. Rotate the turntable until the needle is just above the record. If the needle is not Vg inch in from the edge of the rec ord, an adjustment may be made by bending the ear of the set-dow

24、n cam which is in contact with the eccentric stud. See figure 1. Bending the ear outward moves the set-down point away from the spindle; bending the ear in toward the shelf shaft moves the set-down point toward the spindle. Recheck the needle set-down. Us ing a 12-inch record, with the shelf set to

25、the 12-inch position, repeat the adjustment, bending the corre sponding ear of the set-down cam (figure 1). The eccentric stud mentioned above (shown in fig ures 1 and 5) provides a fine adjustment of the set- down position. This adjustment varies the set-down position of all size records over a tot

26、al range of 31 r inch. Do not use this adjustment unless it is desired to change all three set-down positions by an equal amount. W EAR OF SWIVE POST TONE ARM SHAFT SPRING 56-07 73 l END OF LIFTER LEVER CAUTION: Do not adjust the friction clutch un til the trip-plate engagement is properly set, as e

27、xplained below. FRICTION CLUTCH ADJUSTMENT SCREW NE 56-8 09 SP TRIP ARM CLAMP RETURN LEVER 76-5893 NEEDLE PRCSSURE SPRNG 56 8124 Figure 2. Tone-Arm Height and Lift Adjustments and Vertical Timing Adjustments Yi B inch slack in the pull-cord for all tone-arm posi tions between the tone-arm rest post

28、and the spindle, when the changer is out of cycle. Check by cycling the changer and note that the lifter lever and pull-cord will raise the tone arm straight up to its maximum height, and then move horizontally to the tone-arm rest post after the slack adjustment has been made. SET-DOWN Set the reco

29、rd shelf to the 12-inch position. Set the eccentric stud to its center position toward the corner of the base plate. This stud is accessible through a hole in the base plate near the tone-arm stanchion (see figure 5). Place a 7-inch record on the turntable, set the record shelf to the 7-inch positio

30、n, and cycle the changer by hand until the tone arm is just above the 30 LIFTER LEVER SPRING 56 then loosen one turn. Check the adjustment by playing several records. If the changer pre-trips, loosen the screw (turn clockwise) a bit more. This trip arm and clutch assembly is shown in figure 15. UNEV

31、EN TURNTABLE SPEED (WOWS) Uneven turntable speed may be caused by any of the following conditions: 1. Dirt under and around the idler-wheel assembly. 2. Idler-wheel spring loose or missing. 3. Flat spot on idler-wheel tire or turntable. 4. Loose, worn, or distorted pulley belt. 5. Oil or grease on i

32、dler-wheel tire, pulley, pulley belt, or drive shaft. 6. Speed-control knob not in proper position. DETENT SPRING 56-9758 OFF-ON SWITCH 42-1867 GREASE SPRING WASHER PICKUP SWITCH 42- GREASE OIL REJECT SPRING 56-9757 REJECT LEVER 56-8079 GEAR SPINDLE SCREW AND OCKWASHER 6-52X1/4 SET DOWN STUD Figure

33、5. Top View, Showing Lubrication Points 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS Philco Record Changer Model M-24, continued. SET DOWN LEVER GREASE 76 5 894 SET-DOWN LEVER SPRING 56 8093 GREASE OIL PUSH-OFF LEVER STUD SPINDLE LEVER 56-8130 PUSH-OFF LEVER ASSEMBLY 76 59

34、08 SPINDLE SPRING 56 8131 ADJUSTABLE- EAR OF PUSH-OFF LEVER ASSEMBLY &M FUNCTION CONTROL KNOB BUSHING TL ms -ADJUSTABLE EAR OF TRIP PLATE TONE ARM SHAFT TONE ARM ACTUATOR ACTUATOR SPRING ASSEMBLY 56-8095 76- 6502 Figure 6. Bottom View, Showing Lubrication Points SPEED SHIFT LINK- 56 8091 REJECT LINK

35、 56-9761 _ MOTOR SPEED SHIFT PLATE 56 8083 CUP WASHER RECORD SHELF SHAFT FRICTION TRIP FINGER 56 8112 TRIP ARM CLAMP SCREW m I tmti- m BRIDGE SUPPORT STUD SPRING ANCHOR STUD TONE ARM ACTUATOR MOTOR SPEED ASSEM8LY SUPPORT SHIFT LEVER STUD TONE ARM ACTUATOR ASSEM8LY 76-6502 CAM GEAR INDEX LEVER 76 589

36、5 - LIFTER LEVER 56-8132 BRIDGE ASSEMBLY TRIP-RESET cam 54-8139 CAM GEAR ASSEMBLY 76-5905 TURNTA8LE SPINDLE TRIP PLATE ASSEMBLY 76-5906 Figure 7. Bottom View, Bridge Removed, Showing Lubrication Points MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS KNOB , FUNCTION CONTROL 54-4971 crank AND SHAFT AS

37、SY 76 769 B FLAT WASHER_ IW5290IFA3 KNOB , SPEED CONTROL ASS Y 76-7700 E WASHER IW60977FE7 Philco Automatic Record Changer MODEL M-24 (Continued) FLAT WASHER IW52200FA3 SPRING WASHER IW56309FE7 SPEED SHIFT LCVER E WASHER W60983FE7 SPEED SHIFT LINK 56-8091 OFF-ON SWITCH LEVER 56-9762 A MTG SCREW 6X56

38、 IW2I56IFA3 .WASHER SHOCK MOUNT . 54-4501 MTG. SPACER 56 4926-1FA3 MTG- SPACER 56-4826-IFA3 r MTG SCREW 6X56 IW2I56IFA3 q -HAIRPIN I CLOTH WASHER IDLER WHEEL 76-5267 DRIVE BELT 54 7959 Hairpin fastener REJECT LINK 56-9761 Figure 11. Motor AssemblyPart No. 35-1451 Figure 10. Control Assembly LARGE SP

39、ACER WASHER RETURN LEVER 76-5693 -RETURN LEVER SPRING 56-8092 SPACER SET-DOWN LEVER SPRING 56-8093 COMPRESSION SPRING 56-6087 WASHER -TONE ARM ACTUATOR ASSEMBLY 76-6502 SET-DOWN LEVER 76-5894 E WASHER 1W6O9B0FE5 WASHER E WASHER 1W60977FE7 ACTUATOR SPRING 56-8095 Figure 8. Actuator Assembly MANUAL OF

40、 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS Philco Automatic Record Changer Model M-24, continued. DAMPER 54-7923 cartridge retaining spring 56- B 796 BP DAMPER /54-8222 FRONT RETAINER PLATE 56-6795 MOUNTING. SCREW contact plate 76-4647 *0* BOTH CARTRIDGE 45-9612 NEEDLE - 45-95BB REAR RETAINER PLATE 56-8

41、415 SHAFT and SWIVEL PIN 56 7011 SHOCK MOUNT 54 4729 w MOUNTING SCREW _TONE ARM SHELL 35-2707 DAMPER 54-8221 SHAFT AND SWIVEL A MTG BRACKET 56-9763 VERTICAL TIMING - - 7- PULL-CORD & 76 - 2 982 -4 7 SWIVEL MOUNTING V-SHOULDER SCREW NEEDLE PRESSURE SPRING 56 0124 SHAFT AND SWIVEL ASSEMBLY 76 59M WASH

42、ER IW52005FA3 EYELET 56-9764 SCREW IWI0582FA3 FRICTION WASHER 54 B103 JTONE ARM SHAFT SPRING 56 B 7 73 Figure 14. Tone-Arm Assembly FRICTION TRIP ADJUSTMENT SPRING 56-BIII CLAMP SCREW NUT 56*7042 CLAMP SCREW_ 10-32 * I I 13 PLUNGER 56-8110 6 FRICTION SCREW “ LOCK SPRING 5B- BIOS FRICTION TRIP ADJUSTMENT SCREW 5B-BI09 LEAD WASHER (4) - B W 52 297 TRIP-ARM ASSEMBLY 76-5910 FRICTION CLUTCH WASHER 54-8142 F R ICTION TRIP FINGER 56-BII2 WASHER 56 B1I3 E WASHER Figure 15. Trip-Arm Assembly