RCA-Victor-Co-Inc-7QB 电路原理图.pdf

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1、PAGE 142-C MODELS 7QB and 7QBK Chassis No. RC -496 Seven -Tube, Three -Band, Superheterodyne Receivers and Power Units CV -110 and MI -8122 TONE yam A FU LL OFT TONE A 8 C 11. POWER -TONE RANGE CONTROL SELECTOR TUNING CONTROL VOLUME CONTROL a PILOT LIGHT SWITCH At Lef t- Model 7QB At Right- Model 7Q

2、BK The pilot lights arc illuminated by pressing in the volume control knob. (The pilot lights are not controlled by this action when the receiver is operated with the CV -110 a -c power supply unit.) Electrical Specifications FREQUENCY RANGES Standard Broadcast (A Band). 540.1,720 kc (555.174 m) Med

3、ium Wave (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 455 kc RADIOTRON COMPLEMENT (1) RCA -6S7 -G R -F Amplifier (2) RCA-6SA7 1st -Detector -Oscillator (3) RCA -6S7 -G I -F Amplifier (4) RCA -6T7 -G 2nd-Det., A.V.C., and Audio (5) RCA -6W7 -G Dr

4、iver (6) RCA -6L5 -G Output (7) RCA -6L5 -G Output Note: An RCA -5)(3-G rectifier is used in the CV -110 A -C power supply unit. PILOT LAMPS (2) Mazda No. 47, 6.3 volts, 0.15 amp. POWER OUTPUT RATING Maximum 2.6 watts Undistorted 2.0 watts LOUDSPEAKERS (Permanent -Magnet Dynamics) 7QB (RL -90-2) 8 -

5、inch 7QBK (RL -71.5) 12 -inch Voice -coil impedance at 400 cycles 2.4 ohms POWER SUPPLY RATING D -C Rating (with vibrator -type power supply unit MI.8122) -6.3 volts, 3.2 amps. A -C Rating (with CV -110 A -C power supply unit) - 105.117, 117-130, 140.160, 200-225, 225-250 volts, 25- 60 cycles. nnlnn

6、nnlnnlnllnnlnlllnnllnrinnllnllnnlnnlnnnnpnllnnlnllrllllul Ilnnlnnlnlrinnlnnlnlllnnlnillrnlnnlnnllll lnnlnnllnllnll 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 ci EASTERN HEMISPHERE 40m HONG KONG - SPRINGFIELD - ROME LONDON - SCHENECTADY - MADRID RIO BERLIN - PHILADELPHIA 31m 8 9

7、 10 BERLIN - TOKYO - PITTSBURGH LONDON ROME - PARIS HUIZEN 25m PRAGUE LONDON - SCHENY BERLIN - LONDON BERLIN - PITTSBURGH BERLIN - PITTSBGH N. YORK - PARIS LONDON - SCHENY AMTR 19m PARIS 16m HUIZEN 13 m N. YORK _ 12 14 16 18 _20_ MC 550m 500m 450m 400m 350m 300m 250m 200m 175m A 550 600 700 800 1000

8、 1200 1400 110a Il 1I1lIl B 2.3 120m TROPICAL BROADCAST 2.5 2.7 3.0 AIRCRAFT 3.5 4.0 5.0 6.0 90m AMATEUR 60m AIRCRAFT TROPICAL BROADCAST TROPICAL BROADCAST MC 49m CINCINNATI - TORONTO MEXICO CITY - CHICAGO - N. YORK HAVANA - BERLIN - PITTSBURGH 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 3

9、0 20 10 0 I1u1111111uIIII11IluIInuIIIIlU11IlullulllulluuIIIIIIIuuullullulllullulhlllI I1111111IIIIIIIIIII111111II11111111II1111111IIIlIIIIl111111111I111111I1I Receiver Dial Seines, and Corresponding 0-180. Calibration Scales RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. A.

10、 收音机爱 好者资料库 RadioFans.CN Alignment Procedure Precautionary Lead Dress. - 1. Dress the blue lead from the antenna lug to the No. 1 terminal on the range switch (S-1) close to the chassis and away from the gang for its entire length across the top of the chassis base. 2. Dress the yellow lead from the

11、 detector coil to No. 8 terminal on the range switch (S2), directly away from the detector coil towards the rear apron. 3. Keep the blue lead from the detector coil to No. 9 terminal on the range switch (S-2), isolated from the other leads and parts. 4. Loop the bus wire from oscillator coil to. No.

12、 5 terminal on the range switch (S-3), directly away from these terminals and other parts as far as possible, bending the loop towards the center of the chassis. 5. Dress the 3,300 mmfd. capacitor (C8) from the oscillator coil to No. 4 terminal on the range switch (S-3), directly toward the center o

13、f the chassis, being sure to clear the bus wire loop mentioned above (4). 6. Pull in the slack on the long yellow wire which runs from the terminal board in the rear corner to the tone control, at the tone control end, making the portion of the lead lying outside the front apron taut, and close to t

14、he apron. Cathode -Ray Alignment is the preferable method. Connec- :ions for the oscillograph are shown in the chassis drawing. Output Meter Alignment.-If thin method is used, connect tht: meter across the voice coil, and turn the receiver volume control to maximum. Test-Oscillator.-For all alignmen

15、t operations, connect the low side of the test -oscillator to the receiver ground terminal (G), and keep the output as low as possible to avoid a -v -c action. TI t T2 AUDIO DRIVER 1, OUTPUT TRANS. OUTPUT OUTPUT 2ND. DST AF-AVC. PACE 3-2 7QB, 7QBK, CV -110, MI -8122 ANT COIL C40 DET C17 C6- 05C. OSC

16、. 20 MC. 2ND.I.F ,TRAN9. 2 C9. O5C. 1500 KC C7 -05C L7- O5C A G GOO RC Calibration 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

17、 on the front shaft of the gang condenser. Th, 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. Pointer for Calibration Scale.-Improvise a pointer for the c

18、alibration scale by fastening a piece of wire to the gang - condenser frame, and bend the wire so that it points to the 1800 mark on the calibration scale when the plates arc fully meshed. Dial -Indicator Adjustment.-After fastening the chassis in the cabinet, attach the dial indicator to the drive

19、cable with indicator at the left-hand end mark on the dial scales and gang condenser fully meshed. The indicator has a spring clip for attachment to the cable. DET COIL POWER CONNECTOR 1ST I.F O 10 TRANS. J 1 2 3 L13.5EC_ ADJ. 455 KC. Steps Connect the high side of test -ose. to- Tune test- osc. to-

20、 Turn radio dial to- Adjust the following for maximum peak output 1 0S7 -G I -F grid cap in series with .01 mfd. - 455 kc A band Quiet point between 550-750 kc L14 and L15 (2nd I -F trans.) 2 6SA7 1st det. grid cap in series with .01 mfd. L12 and L13 (1st I -F trans.) 3 Antenna terminal in series wi

21、th 300 ohms 20 me 20 mc (22) C band C6 (osc.)* C12 (det.) (Rock Cl (ant.) Gang) 4 6.1 me 6.1 me (27.9) B band C7 (osc.)* C13 (det.) C2 (ant.) 5 Antenna terminal in series with 200 mmfd. 600 kc 600 kc (143.5) A band L7 (osc.) Rock Gang 6 1,500 kc 1,500 kc (27.8) A band C9 (osc.) C14 (det.) C3 (ant.)

22、7 Repeat steps 5 and 6 * Use minimum capacity peak (plunger out) if two can he obtained. Check to determine that C6 has been adjusted to the correct peak by turning radio to approximately 19.09 me where a weaker signal should be received. * Use minimum capacity peak if two can he obtained. Check to

23、determine that C7 has been adjusted to the correct peak by turning radio to approximately 5.19 me where a weaker signal should be heard. Note: Oscillator tracks above signal on all bands. 收音机爱 好者资料库 RadioFans.CN PAGE 144-C 7QB, 7QBK, CV -110, MI -8122 CV -110 A -C Power Supply Unit CHECK PREVNUNG UN

24、E VOLTAGE AND MOVE JIM PER TO CORRESPONDING CONTACT (JUMPER CONTACTS NIE UNDER LID ON TOP OF POWER TRANSFORMER) 20j210 -GREEN ISO 0-RED- YELLOW p n 1B BLACK K S O RED BLACK CONVECT ThpR A V SUPlY FOR VICTROLA MOTOR Ti YELLOW ion TOTAL A SUPPLY PLUG =p1 PRI. ( L_ GREEN MOWN HI -VOLTAGE 30Sn SEC. TOTA

25、L S LACK BROWN B ROWN 5Y3-G RECTIFIER (BOTTo. VIEW OF SOCKET) REACTOR LI 410. 1111 YEL. YEL MFO ELECTROLYTIC 1612F9 16 LIFO NEC. TERMINAL OF ELECTROLYTIC MARKED WITH BLACK DOT BLUE BROWN HEATERS BLUE BLUE BROWN BLACK R1 ISO EL LOW 3 D O CON N23219MOl13A 92y 9 3 fU M C Zr 4 FZZV _O VN Wi s7 SICA NI-O

26、eNISDII ridr;rd e III NF1+ufJt- Iz re V 3 O u ti U a D 1 I- u O BLACK BLACK FRONT VIEW OF CONNECTOR POR CONNECTOR (WIRING SIDE) 0 0 M/17310 CV NO 收音机爱 好者资料库 RadioFans.CN r1 F oci UF _ Q lD W m UO -,AA,ti IL o mu. -N dd5 VN uzf 4r- s m 4 , UO r 4 d = WO 0 et VOF N N N l 4 001 H J l o JUL .AA .k9.rz w

27、 T, 9 =a 0 ni o - 14 W Qf PAGE 145-C 7Q8, 7QBK, CV -110, MI -8122 wV FI aa QJ r Z V hV J V 114 W 3 NOUp F Z PN a UN cc m mm d O F (f) U 0 8 li To f U10fT d4 aO (D4 N4 UmF I: gNF -11n- ,rii ur L UJ J J T u rD PACE i46-C 7QB, 7QBK, CV -110, MI -8122 Arrangement of Drive Cords for Tuning Condenser and

28、Dial Indicator DRUM SHOWN WITHCWNG At MAXIMUM CAPACITY REPLACEMENT PARTS 11-417298 Insist on genuine factory -tested parts, which are readily identified and may be purchased from authorized dealers. STOCK No. DESCRIPTION STOCK DESCRIPTION CHASSIS ASSEMBLIES 4669 Screw-No. 8-32 square head set screw

29、for drum (RC -486) Stock No. 31808 14374 Shield-Shield can for coils Stock Nos. 31780, 12806 Board-Antenna-Ground board 31781 12717 Board-Phonograph terminal board 31364 Socket-Dial lamp socket 12714 Capacitor-Air-trimmer medium -2-12 mmfd. 31251 Socket-Tube socket (C6, C7, C9) 14404 Socket -7 -pron

30、g male connector 34654 Capacitor-Mica trimmer comprising 2 sections 13638 Spring-Drive cord spring of 2.5-10 mmfd., and 1 section of 2.5-20 mmfd. 31775 Switch-Range switch (C12, C13, C14) 14261 Transformer-First i -f transformer 34653 Capacitor-Mica trimmer comprising 2 sections 14283 Transformer-Se

31、cond i -f transformer of 5-50 mmfd., and 1 section of 3-30 mmfd. (Cl, C2, C3) 32368 Transformer-Transformer pack including an audio and an output transformer (Replacement 12722 Capacitor -18 mmfd. (C18) transformer has one additional green lead not 12723 Capacitor -56 mmfd. (C19, C41) required for 7

32、QB or 7QBK-tape to prevent 30949 Capacitor -56 mmfd. (C21) shorts) 32238 Capacitor -110 mmfd. (C20) 31813 Capacitor -120 mmfd. (C26, C27) POWER SUPPLY UNIT ASSEMBLIES 14712 Capacitor -180 mmfd. (C28) (MI -8122) 12694 Capacitor -220 mmfd. (C5, Cil, C15) 31433 Capacitor -560 mmfd. (C10) 12720 Capacito

33、r -100 mmfd. 31403 Capacitor -3,300 mmfd. (C8) 31796 Capacitor-.02 mfd. (C3, C4) 35252 Capacitor -6,250 mmfd. (C18) 12484 Capacitor -0.25 mfd. (C3) 34459 Capacitor-.0025 mfd. (C31) 33879 Capacitor -10 mfd. 33554 Capacitor-.005 mfd. (C33) 14289 Clip-Battery clips-one marked + and one 4937 Capacitor-.

34、01 mfd. (C23) unmarked 30856 Capacitor-.015 mfd. (C29, C34) 31794 Coil-Choke coil 32787 Capacitor-.05 mfd. (C24) 12819 Coil-Vibrator coil and terminal board assembly 4839 Capacitor -0.1 mfd. (C22, C25, C39) 5140 Fuse -5 Amp. 12484 Capacitor -0.25 mfd. (C30, C32) 14409 Plug -7 -contact female plug fo

35、r power cable. 12741 Capacitor -0.5 mfd. (C35, C38). 12262 Resistor -680 ohms, t watt (Rl, R2) 32152 Capacitor-Electrolytic, 2 sections 15 mfd. each 31793 Transformer-Vibrator power transformer (C36, C37) 31795 Vibrator-Plug-in vibrator 31780 Coil-Antenna coil (L1, L2, L3, L4)-less shield CV -110 A

36、-C POWER SUPPLY UNIT 32824 Coil-Oscillator coil (L5, L6, L7) 32015 Capacitor -1 mfd. (C2) 31781 Coil-R.F coil (L8, L9, L10, L11)-leas shield 32013 Capacitor-Comprising 2 sections 16 mfd. each (C1, C3) 31774 Condenser -3 -gang variable tuning condenser. 14409 Plug -7 -contact plug for power output ca

37、ble 31777 Control-Tone control 32014 Reactor-Filter reactor (L1) 31776 Control-Volume control and power switch . 30880 Resistor-I50 ohms, watt (Rl) 34682 Cord-Drive cord 31251 Socket-Rectifier tube socket 32713 Core-Adjustable core and stud for oscillator coil 31998 Transformer-Power transformer, 10

38、5-130, 140- 31787 Drive-Two (2) speed drive with mounting bracket 160, 200-250 volts, 25-60 cycles (T1) 31808 Drum-Pointer cord drive drum SPEAKER ASSEMBLIES 31480 Lamp-Dial lamp Model 7QB 31373 Pulley-Drive cord pulley :mall (RL -90-2) 34854 Pulley-L.H. pulley and bracket assembly-less small pulley

39、 and retainer 31825 Cap-Dust cap 34855 Pulley-R.H. pulley and bracket assembly-less 35193 Cone-Cone complete with voice coil small pulley and retainer 35192 Speaker -8 -inch permanent magnet speaker com- 31788 Pulley-Two speed drive pulley plete with cone and voice coil-less plug 13988 Resistor -10

40、ohms, watt (R4) SPEAKER ASSEMBLIES 30546 Resistor -470 ohms, watt (R21) Model 7QBK 3153 3526 Resistor -1,500 ohms, 1 watt (R19) Resistor -2,200 ohms, watt (R20) (RL -71-5) 14559 Resistor -10,000 ohms, I watt (R2) 31275 Cone-Speaker cone and voice coil 5114 Resistor -15,000 ohms, 1 watt (R8) 5118 Plu

41、g -3 -contact male plug for speaker 14284 Resistor -22,000 ohms, 1/10 watt (R9) 31798 Speaker Complete 12738 Resistor -27.000 ohms, watt (R11) 11300 Resistor -33,000 ohms, 1/10 watt (R5) MISCELLANEOUS ASSEMBLIES 30660 Resistor -56,000 ohms, .1 watt (R6) 13715 Resistor -68,000 ohms, 4 watt (R16) 3485

42、9 Dial-Glass dial scale 11281 Resistor -100,000 ohms, 1/10 watt (R15) . 33833 Escutcheon-Station selector dial scale escutcheon 11398 Resistor -220,000 ohms, 1/10 watt (R10) 34858 Frame -Dial frame complete-less pointer guide 30983 Resistor -820,000 ohms, 4. watt (R12)rods,pointer 34860 and carriage

43、 and dialoscale Indicator-Stationcg selector indicator 12013 Resistor -1 meg., 1/10 watt (R3, R17) 34862 Knob-Range switch knob 13730 Resistor -1 meg., I watt (Rl) 34861 Knob-Tuning, tone control or volume control 31056 Resistor -1.2 meg., 1/10 watt (R13, R26) and power switch knob 35190 Resistor -1.8 meg., 1/10 watt (R22) 34491 Shaft-Pointer carriage guide rod 5131 Resistor -2.2 meg. 1/10 watt (R7) 14270 Spring -Retaining spring for knobs Stock Noe. 30340 34861 and 34862 Retainer-Drive cord pulley -small retainer.