RCA-Victor-Co-Inc-QU56M 电路原理图.pdf

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1、PAGE 526-C MODELS QU 56C, QU56M Chassis No. RC -566A Five -Tube, Three -Band, AC, Superheterodyne Radio -Phonograph Combinations Electrical and Mechanical Specifications FREQUENCY RANGES Standard Broadcast (A Band) 540.1,720 kc (555-174 ni) Medium Wave (B Band) 2.3-7.0 mc (130-42.9 in) Short Wave (C

2、 Band) 7.0-22.0 mc (42.9-13.6 m) INTERMEDIATE FREQUENCY 455 kc TusB COMPLEMENT (1) RCA 6SA7 1st Detector -Oscillator (2) RCA 6SK7 I -F Amplifier (3) RCA 6SQ7 2nd Detector AVC, and A.F. Amplifier (4) RCA 6K6GT Power Output (5) RCA 5Y3G Rectifier PILOT LAMP Mazda 44 POWER OUTPUT Undistorted 1.4 watts

3、Maximum 2.3 watts LOUDSPEAKER QU56M and C Speaker No. 92196-504 Type 6 -ht. x 9 -in. Elliptical PM V.C. Impedance at 400 cycles 3.7 ohms POWER SUPPLY RATING 105-125 volts, 50-60 cycles 65 watts 105-125, 210-250 volts, 50-60 cycles 65 watts 105-125 volts, 25 cycles 65 watts PHONOGRAPH CABINET DIMENSI

4、ONS Height 121 inches Width 171 inches QU56M QU56C Depth 141 inches Type of Pickups Magnetic Crystal Weight (net) 261 pounds Type of Mechanism Manual Chassis Base Dimensions 101 in. wide, 5 in. deep, 2 in. high Turntable Speed 78 r.p.m. Over-all Chassis Height 81 inches MAGNETIC PICKUP Phonograph In

5、formation The QUSGMI is equipped with a magnetic pickup, the O1 -56C with a crystal pickup. The output of the crystal pickup is fed into the audio end of the receiver through a switch and compensating circuit. On instruments using a magnetic pickup, a transformer and compensating circuit are used be

6、tween the pickup and the audio input (see schematic diagram). The transformer has two jacks, the larger 2ne (primary) for 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

7、a terminal board in the cabinet. lb DH ONO JACK R22 39 M R23 12 M T35C 0 S9 110 V. SUPPLY Sell( matit Shotrinv Magnetic Pickup Connections (QC5631I MOTOR PICKUP CRYSTAL CUP FOR NEEDLE PACKAGE SUPPORT PICKUP USED NEEDLES HOLDER QU56M 1111111 -1111I -_-_ NEEDLE SCREW MOTOR C a R RANGE ONTROL MOTOR SPI

8、NDLE DIAL TUNINGI ONT ROL o R Q U56C 304*-r TURNTABLE SPINDLE , Low IYLL PHONO -55010 TONE CONTROL il son TURNTABLE i15( PICK- UP 1 n Motor Schematic POWER -VOLUME CONTROL t_ 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 Ce a1/4r) C. ev N O F- tr

9、i J O ,i) N_ -il ot IH . -. 4 Q ._ I o II 4 Ulf) o 1/49 aN 4 u N W - CC IH S- 00 - - z o cc LL N o co a J)u 0 J J w o w 0J Lutu oo LPLI. W w o I Q U J to cow H 2 o rn 3 & ib N do C u e C V III. c+1 .o, .019/ ,00, -00 :3u r m Jln Q _J Ln ei PAGE 527-C QU-56C, -M N 收音机爱 好者资料库 RadioFans.CN PAGE 528-C Q

10、U-56C, -M Alignment Precautionary Lead Dress. 1. B -and C band antenna trimmer leads . - be dressed away from B and C band oscillator trimmer loads. 2. Excess power transformer leads to be dressed between power transformer bell and rear apron of chassis. 3. R9 1st Audio grid lead, dressed down to ch

11、assis. 4. B Band Antenna coil lead to he wired so that it is dressed around B band section in a clockwise direction to coil lug in order to obtain proper B band tracking. 5. C band oscillator cathode lead to be dressed around coil in clockwise direction as shown in sample. 6. Dress tone control capa

12、citor C23 up and away front A.C. switch leads. 7. Dress capacitor C25 from phono. socket to 6SQ7 socket up and away from all parts and leads. 8. Dress audio coupling C22 from volume control clear of A.C. wiring. 9. Red lead from A.C. switch to power switch to he dressed down against base. 10. Drive

13、front gang mounting screw first. 11. Green lead to phono. socket dress up from chassis. 12. Dress A.C. switch leads to side apron. 13. Dress R20, R21 close to front apron. C it r C oc 21.5S MC. I LJ C12 1 e-oSC .1 roc 1_1 r CI3 A-osc. 1500 KC. 7 i CS B. ANT. CANT PHONO. 6.1MC. 21.5 MC. JACK BLUE -AN

14、TENNA BLACK -GROUND 220V. 110V. L10 -BOTTOM 1.11 _TOD 455 KC. TO PHONO POWER CORD Procedure Cathode -Ray Alignment is the preferable method. Connections for the oscillograph are shown in the schematic drawing. Output Meter Alignment.-If this method is used, connect the meter across the voice coil, a

15、nd turn the receiver volume control to maximum. Test-Oscillator.-For all alignment operations, connect the low side of the test -oscillator to the receiver chassis, and keep the output as low as possible to avoid a -v -c action. Pre -Setting Dial.-With gang condenser in full mesh, the pointer should

16、 be 1/16 inch to the left of first mark on dial backing plate. Steps Range Switch Connect high side test osc. to- Tune test osc. to- Turn radio dial to Adjust follow - ring for ma:. peak output 1 I -F grid in series with .01 mfd. 455 kc A band quiet point at high freq. end. L10, L11 (2nd I -F trans.

17、) 2 1st det. grid, in series with .01 mfd. L9, L8t (1st I -F trans.) 3 Antenna lead in series with 200 mmf. 1,500 kc (200 m) 1,500 kc mark (5th mark) C13, C3 4 600 kc (500 m) 600 kc mark (2nd mark) L7* Rock gang 5 Repeat s eps 3 and 4. 6 B Antenna lead in series with 300 ohms 6.1 mc 6.1 me mark (5th

18、 mark) C12* (osc.) C5 (ant.) 7 C 21.5 me 21.5 me mark (6th mark) C11,* C4 * Use minimum capacity peak if two peaks can be obtained. * Rock gang slightly for peak output. t Do not readjust LI1 or L10 when test oscillator is applied to the 6SA7 Grid. NOTE: Oscillator tracks above signal on all bands.

19、o56 M&C Replacement Parts Insist on genuine Factory -tested pens, which are readily identified and may be purchased From authorized dealers STOCK No. DESCRIPTION STOCK No. DESCRIPTION 35761 32830 32829 12723 30949 30904 12724 12694 12952 12537 31403 31405 4838 33584 4870 4839 32821 38292 38287 38408

20、 32634 32713 36237 38331 CHASSIS ASSEMBLIES (RC 566-A) Capacitor-Electrolytic-comprising 1 section of 20 mfd., 350 volts, and 1 section of 10 mfd., 350 volts Capacitor-Mica trimmer-comprising 2 sections of 2-20 mmfd. each Capacitor-Mica trimmer-comprising 3 of 5-80 mmfd. each Capacitor -56 mmfd., mo

21、ulded Capacitor -56 mmfd., unmoulded Capacitor -100 mmfd. Capacitor -120 mmfd. Capacitor -220 mmfd. Capacitor -330 mmfd. Capacitor -560 mmfd. Capacitor -3,300 mmfd. Capacitor -6,000 mmfd. Capacitor-.005 mfd., 1,000 volts Capacitor-.005 mfd., 1,200 volts Capacitor-.025 mfd Capacitor -0.1 mfd. Coil-An

22、tenna coil-A, B, and C bands Coil-Oscillator coil-A, B, and C bands Condenser-Variable tuning condenser Control-Volume control and power switch Cord-Drive cord (approx. 42 in. overall lgth.) Core-Adjustable core and stud for oscillator coil Drum-Tuning condenser drive drum Indicator-Station selector

23、 indicator 38432 30868 5119 31373 32289 13988 32686 30152 43765 36714 12454 12412 13734 30648 13730 32809 30992 38433 35772 35709 36932 35787 31251 31418 38431 38434 32827 35636 35628 Plate-Dial back plate complete with pulleys- less dial Plug -2 -contact female plug for motor cable Plug -3 -contact

24、 female plug for speaker cable Pulley-Drive cord pulley (I -in. dia.) Pulley-Drive cord pulley (j -in. dia.) Resistor -10 ohms, watt Resistor -680 ohms, 1 watt Resistor -1,000 ohms, 1 watt Resistor -12,000 ohms, 2 watt Resistor -15,000 ohms, watt Resistor -33,000 ohms, watt Resistor -47,000 ohms, wa

25、tt Resistor -120,000 ohms, watt Resistor -470,000 ohms, watt Resistor -1 meg., watt Resistor -3.9 meg., watt Resistor -10 meg., watt Shaft-Tuning knob shaft Shield-Bottom end shield for power transformer Shield-Top end shield for power transformer Socket-Dial lamp socket Socket-Phono input socket So

26、cket-Tube socket Spring-Drive cord spring Switch-Range switch Switch-Tone control switch Switch-Voltage change switch Transformer-First I.F. transformer Transformer-Second I.F, transformer 收音机爱 好者资料库 RadioFans.CN PAGE 529-C QU-56C, -M Replacement Parts (Continued) ST OCK o. DESCRIPTION STOCK DESCRIP

27、TION 35758 Transformer-Power transformer - 105/125 volts, 25 cycle-less end shields 36985 Motor -105-125 volts, 50 cycle motor-less pul - leys, capacitor and cradle 35757 Transformer-Power transformer - 105/125 volts, 50/60 cycle-less end shields 36984 Motor -105-125 volts, 60 cycle motor-less pul -

28、 leys, capacitor and cradle 35759 Transformer-Power transformer - 105, 125- 210/225 volts, 50/60 cycle 36995 Plate-Motor support plate complete with turn - table bearing 33726 Washer-C washer for tuning shaft and pulley, 36997 Spring-Idler arm tensirin spring No. 31373 36996 Spindle-Turntable spindl

29、e 36994 Wheel-Rubber tired idler or drive wheel PICKUP AND ARM ASSEMBLY (CRYSTAL TYPE) AUTOMATIC SWITCH ASSEMBLIES 33591 Arm-Pickup arm shell only 34419 Base-Pickup arm mounting base 38435 Arm-Pivot arm and shaft complete 36772 Cam-Automatic switch cam 34758 Bushing-Rubber bushing and metal bushing

30、for 36771 Mounting-Pickup arm mounting pivot arm 36773 Plug -3 -prong male plug 33122 Crystal-Pickup crystal complete 36521 Spring-Cam tension spring 33529 Screw-Needle screw 38995 Switch-Automatic switch-less cam, base, and shaft PICKUP AND ARM ASSEMBLY (MAGNETIC TYPE) SPEAKER ASSEMBLIES 38420 Arm-

31、Pickup arm shell only-less mechanism, (92196-504) support arm, pins and shielded cable 37947 Cone-Cone complete with voice coil 38436 Arm-Pickup support arm complete-less rubber 5118 Plug -3 -prong male speaker plug bushings 37948 Transformer-Output transformer 14291 Armature-Pickup armature assembl

32、y 34550 32635 Bushing-Rubber bushing for support arm Cable-Pickup lift cable MISCELLANEOUS ASSEMBLIES 38215 Cable-Shielded pickup cable 38216 Catch-Pickup head catch 38996 Cam-Automatic switch cam 14672 38197 Coil-Pickup coil Cover-Insulating cover 4288 11315 Cap-Connector cap for pickup-Model QU56C

33、 Capacitor-.015 mfd. 38421 Head-Pickup head shell only 5196 Capacitor-.035 mfd. 37291 Mechanism-Pickup mechanism complete 38354 Clamp-Dial clamp 38198 Pin-Pin to attach head to arm (i -in. dia.) Pkg. 2 38437 36763 Cup-Used needle cup Decalcomania-Control panel decal 38199 Pin-Pin to attach support a

34、rm to shell (3/32 -in. dia.) 38441 Decalcomania-His Masters Voice decal- Pkg. 5 38196 Screw-Needle screw 35392 Decalcomania-RCA Victrola decal 38217 Screw-Pickup mechanism support screw-Pkg. 38440 4286 Dial-Glass dial scale Ferrule-Ferrule and bushing for pickup - 38213 38214 Spring-Needle point wei

35、ght adjustment spring Stud-Shouldered stud to hold tension spring and head catch 38334 37256 11891 Model QU56C Knob-Tone switch or range switch knob Knob-Tuning or volume control knob Lamp-Dial lamp MOTOR ASSEMBLIES 38439 30870 Mounting-Motor mounting hardware (1 set). Plug -2 -contact female plug f

36、or motor leads. 36986 Arm-Drive wheel or idler wheel support arm. 31572 Plug -3 -prong male plug for motor leads 36988 Armature-Armature complete for 105-125 volts, 33960 Plug-Phonograph output plug-Model QU56M 50 cycle motor 31048 Plug-Single prong male plug for phono input 36987 Armature-Armature

37、complete for 105-125 volts, cable or pickup cable 60 cycle motor 36246 Receptacle-Packaged needle receptacle. 36989 Bushing-Motor mounting rubber bushings 13714 Resistor -5,600 ohms, 4 watt 36991 Capacitor-Motor capacitor for 105-125 volts, 30436 Resistor -12,000 ohms, watt 50 cycle motor 12266 Resi

38、stor -39,000 ohms, watt 36990 Capacitor-Motor capacitor for 105-125 volts, 30900 Spring-Retaining spring for knobs 60 cycle motor 38870 Support-Pickup arm support for Model QU56C 36993 Cover-Bakelite top end. shell for 105-125 volts, 38871 Support-Pickup arm support for Model QU56M 50 cycle motor 14

39、609 Transformer-Input transformer for Model 38992 Cover-Bakelite top end shell for 105-125 volts, QU56M 60 cycle 38438 Turntable Instability : Development of appreciable RF impedance in the electrolytic filter capacitor creates com- mon coupling and may cause IF oscillation. To eliminate this possibility, an RC filter is connected in the +B lead of the 1st -detector plate circuit, as shown in accompanyng sketch. 1ST. I.F. TRANS aa P_ 65A7 U IST. DET.- OSC. ADD ADD 1000s- .05 MFD. I DUS6C,-M 4 In Q56 -C, -M, an RC filter is added in the 1st -detector plate circuit.