RCA-Victor-Co-Inc-QU52M 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 ab N 7 IH n 收音机爱 好者资料库 Radio

30、Fans.CN PAGE 5i 9-C QU-52C, -N Replacement Parts Insist on genuine factory -tested parts, which are readily identified end may be purchased from authorized dealen. STOCK DESCRIPTION STOCK DESCRIPTION CHASSIS ASSEMBLIES 30651 Resistor -270,000 ohms, watt (for crystal type (RC 507L) For Crystal Type P

31、ickup Oly) (RC 507N) For Magnetic Type Pickup 14983 30648 Resistor -330,000 ohms, watt Resistor -470,000 ohms, watt 38923 Bracket-L. H. pulley support bracket complete 30848 Resistor -470,000 ohms, 3 watt with pulley 13730 Resistor -1 meg., watt 38924 Bracket-R. H. pulley support bracket complete 30

32、649 Resistor -2.2 meg., watt with pulley Cable-Phono input 30992 Resistor -10 meg., watt 32556 14350 Screw-No. 8-32 sq. head set screw for drive cable (for magnetic type) . Cable-Shielded for 38398 drum cable radio -phono connector Capacitor-Electrolytic, comprising 3 sections of 33014 38925 Shaft-F

33、lywheel and tuning knob shaft 10 mfd., 450 volts, and 1 section of 20 mfd., 31364 Socket-Dial lamp socket 25 volts 31251 Socket-Tube socket 12714 Capacitor-Air trimmer-medium-2-12 mmfd. 31418 Spring-Pointer cord or drive cord spring 34654 Capacitor-Mica trimmer, comprising 3 sections of 2.5-10 mmfd.

34、 each 31261 Spring-Retaining spring for adjustable core and studs 35646 Capacitor -6 mmfd., ceramic 35622 Support-Tuning knob shaft and flywheel sup - 38012 Capacitor -15 mmfd., ceramic port 12898 Capacitor -15 mmfd., moulded mica 38927 Switch-Phono switch 35644 Capacitor -47 mmfd., ceramic 38926 Sw

35、itch-Range switch 13141 Capacitor -47 mmfd., moulded 32827 Switch-Voltage switch 12723 Capacitor -56 mmfd., moulded 35636 Transformer-First I.F. transformer 30949 Capacitor -56 mmfd., unmoulded 35628 Transformer-Second I.F. transformer 35645 Capacitor -68 mmfd., ceramic 35588 Transformer-Power trans

36、former -105-120 volts, 13057 Capacitor -88 mmfd., moulded 25 cycle 12720 Capacitor -100 tumid., moulded 32911 Transformer-Power transformer -105.120 volts, 30904 Capacitor -100 mmfd., unmoulded 50-60 cycle 12694 Capacitor -220 mmfd 32852 Transformer - Power trans - 12537 Capacitor -560 mmfd. former,

37、 105-125/200-240 35643 Capacitor -3,000 mmfd. volts, 50.60 cycle 4838 Capacitor-.005 mfd., 1,000 volts 33584 Capacitor-.005 mfd., 1,200 volts SPEAKER ASSEMBLIES 4937 Capacitor-.01 mfd., 1,000 volts 4870 Capacitor-.025 mfd (RL 70M-1) 5198 Capacitor-.035 mfd. (for magnetic type) 4886 Capacitor-.05 mfd

38、 13867 Cap-Dust cap 35632 Coil-Antenna coil-A band 12079 Coil-Field coil 35631 Coil-Antenna coil-spread band 11469 Coil-Neutralizing coil 35623 Coil-Oscillator coil-A and B bands 36145 Cone-Cone complete with voice coil 35624 Coil-Oscillator coil -19-13 meter .band 5039 Plug -4 -prong male plug for

39、speaker 35625 Coil-Oscillator coil -25 meter band 37899 Transformer-Output transformer 356.28 35619 Coil-Oscillator coil -31 meter band Condenser-Variable tuning condenser MISCELLANEOUS ASSEMBLIES 38409 Control-Tone control 38412 Control-Volume control and power switch 36461 36328 Button-Plugbutton

40、Cover- -Compartment lamp lead cover 32634 Cord-Drive cord (approx. 27 in. overall lgth.). 33680 Cup-Used needle cup 32834 35788 31259 Cord-Pointer cord (approx. 47 in. overall lgth.) Core-Adjustable core and stud for A and B band oscillator coil Core-Adjustable core and stud for 19-13 meter bind, 25

41、 meter band, and 31 meter band oscillator coils 36074 37839 35388 38388 Decalcomania-Radio-Phono switch decal Decalcomania-Range switch decal. Decalcomania-Tone controldecal. Decalcomania-Trade mark decal. (His Masters Voice) 3564235627 Dial-Drive drum calibrator dial - 35392 Decalcomania-Trade mark

42、 decal. (RCA Vic - trola) 35638 Drum-Drive drum-less calibrator dial Flywheel-Tuning shaft flywheel 35391 Decalcomania Tuningdecal. 30868 Plug -2 -contact female plug for motor cable 35387 Volume -power switch decal. Decalcomania-Volume-power 5040 Plug -4 -contact female plug for speaker cable 38982

43、 30698 Dial-Glass dial scale s lid hinge 35630 Pulley-Drive cord pulley-between tuning knob and range switch shafts 36039 IHndicator-Station selector fndicatr 30735 Resistor -560 ohms, 1 watt 13103 38334 Knob-Range Jewel-Compartmentswitchlamporp cap switch 30436 36714 35595 Resistor -12,000 ohms, wa

44、tt Resistor -15,000 ohms, only) watt (for crystal type Resistor -15,000 ohms, 3 watt 37256 11765 controlo tone control Knob-Tuning, volume or control knob Lamp-Dial lamp 3219 Resistor -18,000 ohms, i watt (for magnetic g type) 5470 31470 Lamp-Compartment lamp Mounting-Motorboard spring mounting hard

45、 - ware 30492 Resistor -22,000 ohms, I watt 33774 Mounting-Speaker mounting hardware 12454 Resistor -33,000 ohms, watt 38246 Receptacle-Packaged needle receptacle 14138 Resistor -68,000 ohms, watt (for magnetic 37800 Shade-Compartment lamp shade type only) 35575 Spring-Lid support spring 13734 Resis

46、tor -120,000 ohms, watt 30900 Spring-Retaining spring for knobs 30.493 Resistor -150,000 ohms, watt 36414 Support-Lid support 14020 Resistor -150,000 ohms, watt (for magnetic type) 14609 Transformer-Input transformer (for magnetic type only) FOR RECORD CHANGER REPLACEMENT PARTS SEE SERVICE NOTES ON RP -152