RCA-Victor-Co-Inc-QU52C 电路原理图.pdf

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1、PAGE 51_6-C MODELS 0U52C and QU52M Chassis No. RC -507L RC -507N Six -Tube, Five -Band, A -C, Superheterodyne Radio -Phonograph Combinations Electrical and Mechanical Specifications FREQUENCY RANGES Standard Broadcast (A band) 540-1,720 kc (556-174 m) Medium Wave (B band) 3.0.9.5 me (100-31.6 nt) 31

2、 Meter Spread Band 9.5-11.7 me (31.6-25.6 m) 25 Meter Spread Band 11.7-15.1 me (25.6-19.9 m) 19-13 Meter Spread Band 15.1-22.5 me (19.9-13.3 m) INTERMEDIATE FREQUENCY 455 kc POWER SUPPLY RATING 105-125, 200-250 volts, 50-60 cycles 80 watts total 105-125 volts, 25 cycles 80 watts total TUBE COMPLEMEN

3、T (1) RCA-6SA7 1st Detector -Oscillator (2) RCA-6SK7 I -F Amplifier (3) RCA-6SQ7 2nd Detector, A -F Amplifier, A.V.C. (4) RCA-6AD7-G Phase -Inverter, Power Output (5) RCA -6F6 -G Power Output (6) RCA -5Y3 -G Rectifier POWER OUTPUT Undistorted 3 watts Maximum 3.5 watts PHONOGRAPH (Automatic) CRYSTAL

4、PICKUP (QU52C) Impedance 100,000 ohms at 1,000 c.p.s. Average Output. 1.5 volts at 1,000 c.p.s. across 500,000 ohm load MAGNETIC PICKUP (QU52M) Impedance 96 ohms at 1,000 c.p.s. Average Output 0.14 volts at 400 c.p.s. across open circuit LOUDSPEAKER (RL -70M1) Type 12 -inch Electrodynamic V -C imped

5、ance at 400 c.p.s 2.2 ohms Height Width Depth CABINET DIMENSIONS (inches) 32 29$ 17k Chassis Base Dimensions (inches) 2$ 15k 5 Overall Chassis Height 7 inches Weight (net) 71 pounds Tuning Drive Ratio -25 to 1 QU52C QU52M RED ZBRACKET TURNTABLE MOTOR BOARD CONTROLS PICKUP SPINDLE DIAL CHASSIS MOTOR

6、RED BRACKET AND TWO SCREWS TWO SHIPPING BOLTS WITH RED HEADS CHASSIS MOUNTING BOARD R-816 Phonograph Information For information on Automatic Mechanism refer to Service Notes For RP152 he Q (:323I SI is equipped with a magnetic pickup, the 171,52C with a -crystal pickup. The output of the crystal pi

7、ckup is fed into the audio end of the receiver through a switch anti compensating circuit. On instruments using a magnetic pickup, a transformer and compensating circuit are used between the pickup and the audio input (see schematic diagram). The transformer has two jacks, the larger one (primacy) f

8、or input from the pickup and the smaller one (secondary) for output to the compensating circuit. The components of the compensating circuit are mounted externally to the chassis on a terminal board in the cabinet. Schematic Showing Magnetic Pickup Connections (QU5231) Caution. - 1. This instrument i

9、s not recommended for playing 10.inch and 12 -inch records in mixed sequence. 2. Never use force to start or stop the motor or any part of the record -changing mechanism or pickup arm. 3. Warped or damaged records may cause the mechanism to jam. 4. Warped records may slide on one another when playin

10、g, result- ing in unsatisfactory reproduction. 5. Do not leave records on the record -holder posts as they may warp, particularly in warm climates. Warped records may be flat- tened by placing them on a flat surface with a .flat heavy article placed on top of them for a few days. 6. Do not leave pic

11、kup needle resting on a record or on the turn- table. Always place it on the pickup rest. 7. Do not insert a used needle in the pickup, and avoid turning a needle after it has been used. 8. If for any reason the phonograph stalls, turn off the turntable switch and remove the records from the record

12、holder shelves. Start the turntable and allow the pickup arm to complete its cycle. 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 517-C QU-52C, -M Alignment Procedure Cathode -Ray Alignment is the preferable method. Connections for the oscil

13、lograph are shown in the chassis drawing. Output Meter Alignment.-If this 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 testoscillator to the receiver chassis, and k

14、eep the output as low as possible to avoid a -v -c action. Calibration Scale on Indicator -Drive -Cord Drum.-The tuning dial is fastened in the cabinet and cannot be used for reference during align- ment, therefore a calibration scale is attached to the indicator -drive - cord drum which is mounted

15、on the shaft of the gang condenser. The setting of the gang condenser is read on this scale, which is calibrated in degrees. The correct setting of the gang in degrees, for each align- ment frequency, is given in the alignment table. As the first step in r -f alignment, check the position of the dru

16、m. The 180 mark on the drum scale must be vertical, and directly over the center of the gang -condenser shaft when the plates are fully meshed. The drum is held to the shaft by means of two set screws, which must be tightened securely when the drum is in the correct position. To determine the corres

17、ponding frequency for any setting of the calibration scales, refer to the accompanying drawing which shows the dial with 0-180 calibration scales drawn at top and bottom. Pointer for Calibration Scale.-Improvise a pointer for the calibra- tion scale by fastening a piece of wire to the gang -condense

18、r frame, and bend the wire so that it points to the 180 mark on the calibra- tion scale when the plates are fully meshed. Dial -Indicator Adjustment. - After fastening the chassis in the cabinet, attach the dial indicator to the drive cable with indicator at the 540 kc mark, and gang condenser fully

19、 meshed. The indicator has a spring clip for attachment to the cable. Spread -Band Alignment,-The most satisfactory method of aligning or checking the spread -band ranges is on actual reception of short. wave stations of known frequency, by adjusting the magnetite -core oscillator coil for each band

20、 so that these stations come in at the correct points on the dial. When a test oscillator is employed for spread -band alignment, a final check should be made on actual reception of short-wave stations of known frequency, and the magnetite -core oscillator coil for each band should be re -adjusted s

21、o that the stations come in at the correct points on the dial. For additional information, refer to booklet RCA Victor Receiver Alignment. n Dial -Indicator and Drive Mechanism Connect the highSteps side of the test-osc. to- Tune test- osc. to- Range switch Turn radio dial to- Adjust the fol- lowing

22、 for max. peak output 1 6SK7 I -F grid in series with .01 mfd. 455 kc A Quiet Point near 180 L3 and L4 2nd I -F Trans. 2 6SA7 1st Det. grid in series with .01 mfd. Ll and L2 1st I -F Trans. 3 Ant, lead in series with 300 ohms 11.8 me 25M 138.5 L5 (osc.) Cl (ant.) 4 15.2 me 17 C2 (osc.) 5 Repeat step

23、s 3 and 4 6 - 7 15.2 me 19-13M 156 L6 (osc.)* 9.5 me 31M 156 L7 (osc.) C3 (ant.) 8 9.5 me B 11.5 C4 (osc.) 9 Ant. lead in series with 200 mmf. 1,500 kc A 26 C5 (one.) CO (ant.) 10 600 kc 150 L8 (osc.) (Rock gang) 11 Repeat steps 9 and 10 * Use minimum capacity peak if two can be obtained. Check imag

24、e to determine that C2 has been adjustell to the correct peak by tuning receiver to approximately 14.29 me (29) where a weaker signal should be received. *Peak at minimu position of plunger if two peaks can be obtained. *Peak at minimum capacity if two peaks can be obtained. NOTE: Oscillator tracks

25、above signal on all bands. Z., -RANGE SWITCH -TUNING I L II.B MC 6C1 9.SMC. arcs KC MC 5 L71I / i 4 CS C 4 OOKC 9.SMC L 9LUe - ANT BUCK- GND n 27 DET. -OSC. -.2 Li TOP L2 BOTTOM ADJ. 455cc I., I tj I r TRANS. ZVOLLIPAZSWITCH TO Tome ASO PHONO COnTROL PDWER TRANS. L) SOTTOM L4 TOP ADJ. 455KC 20050T,A

26、r,4VC 6A07 PHASE I . OUTPUT RECT OUTPUT POWER AK O o Lt a5. Tube and Trimmer Location Precautionary Lead Dress. - 1. All leads between antenna coils and switch must be as short as possible and kept away from oscillator coil, leads and switches. 2. All oscillator coil leads must be kept apart from ea

27、ch other and other leads and parts. 3. Blue plate lead of 2nd I -F should be dressed under other leads and against chassis. 1!O 170 100 150 MO 130 120 Iq 100 40 SD 70 80 50 40 30 20 10 0 9.8 10.0 10.5 11.0 11.8 ac) 31 ISO 170 100 150 140 130 120 110 100 20 Calibration Scale Reduced Reproduction of R

28、eceiver Dial, and Corresponding 0-280 Calibration Scales The corresponding position of the dial indicator for any setting of the calibra- tion scale can be determined by drawing a line from this point on the bottom calibration scale to the same point on the top calibration scale. For- Example: 150 o

29、n the calibration scale corresponds to approximately 600 kc on A band, etc. Read instructions under Alignment Procedure. On actual Dial Scale the markings and calibration are rotated 90 收音机爱 好者资料库 RadioFans.CN PAGE 518-C QU-52C, -M z z 0 U Z a (f 0 f V - Z N 7_oI o o -1u 0r,z, OUTING, L.V. Record kn

30、ives strike edge of records. (This is generally due to warped records, and records with rough edges). It is essential that the spacing between the knife and the record shelf 27 be accurately maintained. The spacing for the 10 -inch record is ndminally .058 inch, and for the 12 -inch record is .075 i

31、nchs To adjust, rotate the knife to the point of minimum vertical separation from the record shelf and turn screw and locknut F to give .055-.061 inch separation. Screw G must not be de- P pressed during this adjustment. After setting screw F, adjust screw G so that when its tip is depressed flush w

32、ith top of record shelf, the vertical spacing between the knife, in its lowest rotational position, and the shelf, is .072-.078 inch. PO0 .ro1 LI ! - .0-. Ma .,U -.v=:_ G F .o u111 a eon 011. IN C -CL 1. 12-1N. .m,.q 0N WSKI, ADJUST C. .olo-m.cle.,.- mi , Records are not released properly, or do not

33、 fall flat. (If record shelves are bent, or not perfectly horizontal, improper operation and jam- piing of mechanism will result). Place a 12 -inch record on the turntable, rotate mechanism to point in cycle where the shelves have turned clockwise as far as the mechanism will turn them. Lift record

34、up so it is in contact with both knives and check clearance between record and edges of shelves. It should he 1/16 -inch as shown. If the clearance at either or both shelves is not correct, loosen set screws H and shift the shelves to obtain this clearance, with the backlash taken up by pressing the

35、 shelves toward the record. Tighten one set screw (the blunt -nose one), run mechanism through cycle several times to check action, then tighten the other (cone -pointed) set screw. 1 .1.,. .ww. Rotate , ,n a r., ., ,ra,., ,ai., I ,hr, ;( I _, Pickup arm support bent too low, or too high. Bend the s

36、upport (which is associated with the pickup arm bearing, so that with the mechanism out of cycle, the lower front edge of the pickup arm is 5/16 -inch above surface of motorboard. Roller on main -lever wont enter cant Bend the trip pawl stop pin so that the roller on end of main lever, when entering

37、 the cam, will definitely clear the cam outer guide plate as well as the nose of the cam plate. (Adjustment K.) Needle lands in 10 -inch position on 12 -inch record, or misses record when playing both types mixed. Increase pressure of flat spring M at bottom of record dis- criminating lever. Needle

38、fails to enter start- ing groove. Raise the right-hand side of cabinet by placing thin spacers under legs. Needle slides over a fett grooves in landing. Raise the left-hand side of cabinet by placing thin spacers under the legs. PAGE 733-C Replacement Parts Model RP -1 52 RP -15, Insist on genuine f

39、actory -lasted park, which are readily identified and may be purchased from authorized dealers. RP -155 RP 1 RP -157 -153, STOCK No. DESCRIPTION STOCK DESCRIPTION PICKUP AND ARM ASSEMBLIES (RP -152) 36725 36254 Motor -105.125 volts, 50 cycle, complete with capacitor Motor -105-125 volts, 60 cycle, c

40、omplete with 33906 Arm-Pickup arm only-less crystal, cable, and pivot arm capacitor 38320 Arm-Pickup pivot arm and shaft-less lift cable and rubber bushings MOTORBOARD ASSEMBLIES 34550 Bushing-Rubber bushing for pickup pivot arm. 32635 Cable-Pickup lift cable 36259 Base-Pickup arm mounting base-RP-1

41、52 only 35694 Cable-Pickup shielded cable (8) 38378 Base-Pickup arm mounting base-RP-152-A, 35171 Crystal-Pickup crystal cartridge and needle RP -152-B, and RP -152-J only screw . 36542 Base-Pickup arm mounting base-RP-152-C 33529 Screw-Pickup needle screw only (RP -152A) 36811 Base-Pickup arm mount

42、ing base-RP-152-D only, , 36321 Arm-Pickup arm only-less crystal, cable. and pivot arm 38257 Board-Motorboard complete with bearings and posts-less operating parts-RP-152 only. 38320 Arm-Pickup pivot arm and shaft-less lift cable and rubber bushings 38375 Board-Motorboard complete with bearings and

43、poets-leu operating parts-RP-152-A, RP - 34550 Bushing-Rubber bushing for pickup pivot arm. 152-8, and RP -162-J 32835 Cable-Pickup lift cable 36258 Board-Motorboard complete with bearings and 35694 Cable-Shielded pickup cable (8) posts-less operating mechanisms-RP-152-C 35171 Crystal-Pickup crystal

44、 cartridge and needle only screw 36813 Board-Motorboard with welded and riveted 33974 Screw-Pickup needle screw studs and bearing - less operating parts - RP -152-D only (RP -152-B) 32556 Cable-Shielded pickup cable and plug, connects to shorting switch 38322 Arm-Pickup arm only-less crystal, cable,

45、 and pivot arm and shaft 38282 Cup-Used needle (insert only for pickup rest) -RP -152, RP -162-A, RP -152-B, RP -152-C 30320 Arm-Pickup pivot arm and shaft - less lift cable and rubber bushings 36518 and RP -152-J) Cup-Used needle cup (insert for pickup rest) 34550 Bushing-Rubber bushing for pickup

46、pivot arm. -RP -152-D only 32635 Cable-Pickup lift cable 36258 Escutcheon-Index escutcheon - RP -162, RP - 35894 Cable-Pickup shielded cable 152-A, RP -152-B, RP -152-C and RP -152-J. 37158 Crystal-Pickup crystal cartridge and needle screw 36377 36260 Escutcheon-Index escutcheon-RP-152-D only Gauge-

47、Pickup needle gauge 33529 Screw-Pickup needle screw 34368 Grommet-Rubber grommet for motor mounting (RP -152-C) 36263 30870 Plate-Turntable shaft support and spring plate Plug -2 -contact male for motor leads 38591 Arm-Pickup arm shell only 31048 Plug-Plug for pickup leads-RP-152-D only. 38320 Arm-P

48、ickup pivot arm and shaft-less lift cable 36261 Rest-Pickup arm rest-RP-152 only and rubber bushings 36379 Rest-Pickup arm rest-RP-152-A, RP -152-B 34550 Bushing-Rubber bushing for pickup pivot arm. and RP -152-J 32635 Cable-Pickup lift cable 36812 Rest-Pickup arm rest-RP-152-D only 32556 Cable-Shielded pickup cable 36543 Rest-Pickup arm rest-RP-152-C only 35171 Crystal-Pickup unit crystal cartridge 36798 Spring-Index lever spring (riveted to motor - 33974 Screw-Needle screw board) (RP -152-D) 32875 Switch-Mot