RCA-Victor-Co-Inc-8QU5C 电路原理图.pdf

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1、PACE 196-C MODELS 802, 8QU5C and 8QU5M Chassis No. RC -443 RC -443-B Eight Tubes, Three Bands RC -443-B Left-Model 8Q2 Right-Model 8Q US (8QU5C has crystal pickup; 8QU5M has magnetic pickup) Electrical Specifications FREQUENCY RANGES Standard Broadcast (A Band) 540.1,720 kc (555.174 m) Medium Wave (

2、B Band) 2.3-7.0 me (130.42.8 m) Short Wave (C Band) 7.0.22 me (42.8-13.6 m) INTERMEDIATE FREQUENCY TUBE COMPLEMENT (1) RCA-6SK7 R -F Amplifier (2) RCA-6SA7 1st Detector -Oscillator (3) RCA -6B8 I -F Amplifier, 2nd Det., A.V.C. (4) RCA-6SC7 A -F Amplifier, Phase Inverter (5) RCA -6F6 -G Power Output

3、(6) RCA -6F6 -G Power Output (7) RCA -5Y3 -G Rectifier (8) RCA-6U5/6G5 Tuning Indicator PILOT LAMPS (3) t 2 -Mazda No. 44, 6.3 volts, 0.25 amp.; 1 -Mazda No. 47, 6.3 volts, 0.15 amp. POWER OUTPUT RATING Undistorted 4.5 watts Maximum 5.5 watts LOUDSPEAKER .(RL -63J-6) Type 8 -inch electrodynamic V.0

4、Impedance 2.2 ohms at 400 c.p.s. PHONOGRAPH MOTOR )self-starting, constant -speed, induction type Victrola Data The 8QU5M is equipped with a magnetic pickup, and the 8QU5C with a crystal pickup. The output of the crystal pickup is ted directly into the Victrola jack at the rear of the chassis. On in

5、stru- ments using a magnetic pickup, a transformer and compensating _ircuit are used between the pickup and the Victrola jack (see Ichematic diagram). The transformer has two jacks, the larger one (primary) for input from the pickup and the smaller one (secondary) ir output to the compensating circu

6、it. The components of the compensating circuit are mounted externally to the chassis on a terminal board in the rear of the cabinet. The phonograph motor is a self-starting, constant -speed induction type. It should be lubricated every six months by applying a few drops of light machine oil to the .

7、spindle bearing and oil hole. The motor spindle is tapered, and a conical rubber piece fits snugly on the spindle. The hole in the turntable bushing is tapered to fit the rubber. This provides an excellent self -centering floating mounting. A metal washer is placed on the spindle under the rubber pi

8、ece. The washer has ears on the under side which fit over a pin that projects through the spindle. The motor switch is automatic for both starting and stopping, and when properly adjusted, will turn the motor on as the pickup is moved from the pickup rest toward the turntable. The switch should be a

9、djusted so that it will snap into the off position when the pickup needle is 12 inzhes from the center line of the spindle shaft. The motor may be shut off at any time by placing the pickup on the pickup rest. ,. 455 kc CRYSTAL PICKUP Impedance 100,000 ohms at 1,000 c.p.s. Average Output . 1.5 volts

10、 at 1,000 c.p.s. across 500,000 ohms load MAGNETIC PICKUP Impedance 96 ohms at 1,000 c.p.s. Average Output . 0.14 volts at 400 c.p.s. across open circuit POWER SUPPLY RATINGS 8Q2: Rating A 105.125 volts 50-60 cycles, 75 watts Rating B - 105-125 volts, 25-60 cycles, 75 watts Rating C 100-130, 140.160

11、, 195-250 volts, 40-60 cycles, 75 watts 8QU5C and 8QU5M Rating A5 105-125 volts, 50 cycles, 105 watts Rating A6 105.125 volts, 60 cycles, 105 watts Rating C5 105.125; 200.250 volts, 50 cycles, 105 watts Rating C6 105-125; 200-250 volts, 60 cycles, 105 watts RADIO PHONO FULL-. ,LOW MEDIUM ,MEDIUM LOW

12、 .-j FULL SOFT OFF. - LOUD MAGIC EYE .-:c_- - -.71A: _As SSC 6CC 7CC tit la 12tt 146E ITC POWER -VOLUME -TONE CONTROL AND MONO- RADIO SWITCH PULLEY RANE INDICATOR TUNING COMO. DRIVE CORD (FRONT OROovE) INDICATOR DRIVE CORD (REAR GROOVE) DRIVE A S C .RANGE TUNING RANGE -TUNING CONTROL TUNING cehoENse

13、s DRIVe PULLEY CORD ARRANGEMENT PULLEY 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 197-C M uo 6 -7 F r000CYb la 4 I- o l0 mg U Q SzoO tZ p n 4 ug - a r52i _ , UN Ake .N NE AN ,. A-V m i II e01 NE, 111 u 0 nE (-1/11z Ui Q. d8 crV V_S U 00, 0

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17、 .- N a , r. N = 1/1N mW = jU aF a ; - owt m FI aL j i.x G OJ m 1 1. O 4 I = .1 W Z 1 N 4J- r . O 7 O /.j y -. z2 Z Z 1 O N Oo ;O ; W C u T g 2 o Y u L O w o, j- W3 D N do s , ! d zY a O M,O us y l99 t_ _ , , NJ7,9 ,v a a O p Un W U Q Q 1 N ,nz . i a, Fp N 6 I 0 u1 mm J U V a Na J+ v 3 h , = QL 1.-

18、r za ame / ,fss, aaaQw W 9 t. aJ1 N a OO _ Y a O a Q 1-emmao ztioidmci I a G rl W W J U. u 0 0 9 O u 9ya Fl O N W ,1 F - - -113), W ,ni: u MO yi 0cG ml19 Lib . N4 E N o o 0321 u- O l9 QNu1NLLuJ ,:M90,919,9a O /F z -,ltiuil9tlih ? a 1 0 0 m (i m- m u p a A d o m -ur Qo ., O o I , ti w OO , a I 3me a

19、,- Ebp m 6EJ yj 2 au r Y .- QF 1- H $ : m W GN HOO a d m - ZZO y G I J o L 0r D - O mu r -NJV,9 o . o 0 0 summit _ N OO U ; 6 T Z WW miIII. r i a2 L 3 m 10 ra ra Ni i -1= a I I C p a L :.1. _ , 1 17 I z N %,., ;, aN Sit! 1H FN = i , N O J a e -ZfJ . J I . Q . L lj O 1 a0D t 3 a mZ i O W na f a W Fu

20、f 30 r OR m M ._ pi aa Z II.jI F j. F F NZa 4 011 C I uO O ,O 2 Y T Y W K N a Z ul7 U0 Z L 1 11-CM17;1.- -I 9171 收音机爱 好者资料库 RadioFans.CN PAGE 199-C Alignment Cathode -Ray Alignment is the preferable method. Connections for the oscillograph are shown in the chassis drawing. Output Meter Alignment. -I

21、f 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 test -oscillator to the receiver chassis, and keep the output as low as possible to avoid a -v -c action. Cali

22、bration Scale on Indicator -Drive -Cord Drum.-The tuning dial is fastened in the cabinet and cannot be used for reference during alignment; therefore, a calibration scale is attached to the rear of the drum which is mounted on the front shaft of the gang condenser. The setting of the gang condenser

23、is read on this scale, which is calibrated in degrees. The correct setting of the gang in degrees, for each alignment frequency, is given in the alignment table. C, -ANT. C2 -ANT. C3 -ANT 20 MC. 6 MC. 1500 KC. C5 ANT IST DET C13 o9C. C17 DET. C10 OSC. CII U 1ST.I.F. TRANS., I i 3. L13 SEC. ADJ. 455

24、KC. TUNING IND. IST. AF PH. INVER. C 20 C 34 C 35 LIS. SEC. ADJ. 455 KC. -blfh 2ND LE U TRANS RECT 2ND. DET_ AVC. C9-DET. C5-DET. CT. DEL LILOSC. C 15. 05C. 1500 KC. 6 MC. 20 MC. 600 KC. 1500 KC. OUTPUT T1 POWER TRANS. VICTROLA JACK Procedure Dial -Indicator Adjustment. -After fastening the chassis

25、in the cabi- net, attach the dial indicator to the drive cable with indicator at the kc mark, and gang condenser fully meshed. The indicator has a spring clip for attachment to the cable. For additional details, refer to booklet RCA Victor Receiver Alignment. 8Q2, 8QU5 Steps Connect the high side of

26、 test- ose to Tune teat- ose. to Turn radio dial to Adjust the follow - ing for maximum peak output 1 6B8 -I -F grid in series with .01 mfd. 455 kc Quiet point on C Band L14 and L15 (2nd I -F Trans.) 2 Stator of middle section of gang C 17 j in series with .01 mfd. L12 and L13 (1st I -F Trans.) 3 An

27、t. terminal in 200seriemmd. s with 600 kc 600 kc (248) A; Band L11 (osc.) Rock gang 4 1,500 kc 1,500 kc (28) A Band C15 (osc.) C9 (det.)t C3 (ant.) 5 Ant. terminal in series with 300 ohms 6.1 me 6.1 me (29) B Band C13 e CB (det.)t C2 (ant.) 6 20 me 20 me (23) C Band C11 (osc.)* C7 (det.)t C2 (ant.)

28、* Use minimum capaci y peak if two peaks can be obtained. t Use maximum capac ty peak if two peaks can be obtained. NOTE: Oscillator tracks 455 kc above signal on all bands. Pointer for Calibration Scale.-Improvise a pointer for the calibra- tion scale by fastening a piece of wire to the gang -conde

29、nser frame, and bend the wire so that it points to the 180 mark on the calibration scale when the plates are fully meshed 180 170 160 50 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 ROY. ;. .,., mw, .111. 1.041004 .,., 8 9 10 12 14 16 18 20 22 .r 550m 500m 3.50,6 3.00.6 350m 300,6 250,6 200m A 5

30、50 600 100 800 1000 1200 1400 1100 .= A . r . . . . r .r.r . . . r r.,r r r.r.r.a.r.r. . B 2.3 2.5 2.7 30 35 4.0 5.0 6.0 10 .o. -,.R 111: . w : .R - .,. - = B Calibration Scale Reduced Reproduction of Receiver Dial, and Corresponding 0-180 Calibration Scales The corresponding position el the dial in

31、dicator for any setting of the calibration 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: 33 on the calibration scale corresponds to approximately 7.9 me on C hand, and.600 kc on A band, etc. Read

32、 instructions under Align- ment Procedure. 00 170 160 50 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 Replacement Parts Insist on genuine factory -tested parts, which are readily identified and may be purchased from authorized dealers. STOCK No. DESCRIPTION STOCK No. DESCRIPTION CHASSIS ASSEMBLI

33、ES 31405 Capacitor -6,000 mmfd. (C37) (RC -443 and RC -443B) 5107 Capacitor-.0025 mid. (C27, CS2) 4838. Capacitor-.005 mfd. (C33, C42) 34133 Arm-Band indicator arm-located on range 13033 Capacitor-.007 mfd. (C31) switch shaft 4858 Capacitor-.01 mfd. (C28, C30) 34502 Arm-Operating arm on range switch

34、 shaft. r. 32787 Capacitor-.05 mfd. (C36, C38) 10194 Ball-Steel ball 32786 Capacitor -0.1 mfd. (C29, C40) 31767 Board-Antenna ground terminal board 12484 Capacitor -0.25 mfd. (C41) 34131 Bracket-Drive cord pulley and brackets 33014 Capacitor-Comprising 3 sections of 10 nid., 33819 Capacitor-Trimmer

35、capacitor -3 sections of 2-10 mmfd. each 450 volts, and 1 section of 20 mfd., 25 volta (C20, C28, C34, C35) 12714 Capacitor-Air trimmer capacitor -2-12 mmfd. (C11, C13) 33762 Coil-Antenna coil-A-B-C bands (Li, L2, LS, L4) 33817 Capacitor-Trimmer capacitor -1 section of 2-20 tumid. (C15) 33763 Coil-D

36、etector coil-A-B-C bands (L5, L6, L7, L8) 33820 Capacitor-Trimmer capacitor -S sections of 3-30 mmfd. each (Cl. C2, C3) 32824 Coil-Oscillator coil-A-B-C bands (L9, L10, L11) 31868 Capacitor -22 mmfd. (C44) 33758 Condenser-Variable tuning condenser (C5, C10, 12723 Capacitor -56 mmfd. (C19) C17) 30949

37、 Capacitor -56 mmfd. (C21, C22) 33814 Control-Volume control and switch (R10, S8). 12729 Capacitor -100 mmfd. (C39) 32635 Cord-Indicator drive cord 12404 Capacitor -120 mmfd. (C23, C24) 32634 Cord-Tuning condenser drive cord 14712 Capacitor -180 mmfd. (C25) 32713 Core-Adjustable core and stud for os

38、cillator 12694 Capacitor -220 mmfd. (C4, C8, C18, C43) coils - - 33235 Capacitor -580 mmfd. (C14) 33770 Drive-Planetary tuning drive-less shafts and 12811 Capacitor -3,800 mmfd. (C12) balls, and shaft _retainer PAGE 200-C 8Q2, 8905 Replacement Parts (Continued) STOCK DESCRIPTION O K STOCK DESCRIPTIO

39、N 33773 Drum-Variable tuning condenser drum and hub AUTOMATIC SWITCH ASSEMBLIES 33185 Gear-Shaft and gear for volume control (Model 8QU5-C) 34132 Gear-Shaft and gear for tone control (Model 8QU5-M) 11891 Lamp-Pilot lamp 34315 Base-Pickup arm base for crystal pickup - 33767 Link-Operating link and ar

40、m on range switch Model 8QU5-C knob shaft 34312 Base-Pickup arm base for magnetic pickup - 5040 34130 Plug -4 -contact female plug for speaker cable Pulley-Drive pulley and brackets Model 8QU5-M 14281 Resistor -68 ohms, watt (RI) 32865 Bracket-Switch bracket and terminal board. 17214 Resistor -560 o

41、hms, 2 watt (R16) 34308 Cam-Switch cam assembly with spring 12955 Resistor -3,900 ohms, watt (R9) 32864 Lever-Switch actuating lever, roller, and clip. 14559 Resistor -10,000 ohms, watt (R15) 34309 Mounting-Pickup arm base mounting (rubber 33489 Resistor -15,000 ohms, 4 watt (R5) grommet, washers, a

42、nd nut) 14284 Resistor -22,000 ohms, 1/10 watt (R7) 34311 Ring-Retaining ring for pickup arm pivot shaft 12454 Resistor -33,000 ohms, I. watt (R19) 14195 Screw-No. 10-32 x 5/18 set screw for switch 3252 Resistor -100,000 ohms, d watt (R6) cam hub 12285 Resistor -470,000 ohms, watt (R13, R14, R17, R1

43、8) 34314 Shaft-Pickup arm pivot shaft-for crystal pick - up-Model 8QU5-C 13730 Resistor -1 megohm, watt (R2, RI, R8). 34313 Shaft-Pickup arm pivot shaft-for magnetic 12679 Resistor -2.2 megohnis., watt (R4) pickup-Model 8QU5-M 13601 Resistor -10 megohrns, I watt (RU, R12). 34310 Spool-Insulating spo

44、ol for switch leads 14350 Screw-No. 8-32 x 11/32 square head set screw 32868 Spring-Switch lever spring for gear and drum 32867 Spring -Tension spring for switch cam 34134 Shaft-Range switch shaft 32866 Switch-Mercury tube and leads 34135 Shaft-Tuning knob shaft 31608 Washer-Retaining washer for swi

45、tch lever. 33829 Socket -Magic Eye bracket and socket SPEAKER ASSEMBLIES 14278 31364 Socket-Phonograph input socket Socket-Plot lamp socket (RL -63-J6) 31251 Socket-Tube socket 31825 Cap-Dust cap 13638 Spring-Indicator drive cord spring 12079 Coil-Field coil (L18) 33769 Spring-Planetary tuning drive

46、 spring 11469 Coil-Neutralizing coil (L17) 31418 Spring-Tuning condenser drive cord spring. 34274 Cone-Cone, complete with voice coil and dust 33757 Switch-Range switch (51, S2, S3, S4, S5). cap (L16) 34602 Switch-Tone control (S6) 5039 Plug -4 -prong male for speaker 32263 Transformer -1st I.F transformer (L12, L13, C21, C22) 14534 Transformer-Output transformer (T2) 14308 Transformer -2nd I.F. transformer (L14, L15, MISCELLANEOUS ASSEMBLIES C23, C24, C25, R