RCA-Victor-Co-Inc-6Q4 电路原理图.pdf

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1、MANUAL OF 1939 MOST POPULAR SERVICE DIAGRAMS Models 7Q4 and 7QIC4 are similar to ModeL6Q4 except for the addition of a tuning indicator (RCA6U5/6G5). The 7QIC4 chassis uses an RCA6F6 output tube, whereas the 7Q4 uses an RCA6F6G output tube. 收音机爱 好者资料库 RadioFans.CN PAGE iii-C Six MODEL 7QK4 MODELS 60

2、4, 704 and 7QK4 Chassis No. RC -441-A RC -478A RC -478B and Seven -Tube, Four -Band, A -C, Superheterodyne Receivers MODEL 7Q 4 Electrical SpeciFications MODEL 6Q4 FREQUENCY RANGES Long Wave (X Band) 145.405 kc (2,069-740 m) Standard Broadcast (A Band) 540.1,720 kc (555.174 m) Medium Wave (B Band) 2

3、.3.7.0 me (130.42.8 m) Short Wave (C Band) 7.0.22.0 me (42.8.13.6 m) INTERMEDIATE FREQUENCY 455 kc TUBE COMPLEMENT (1) RCA-6SK7 R -F Amplifier (2) RCA-6SA7 1st Detector -Oscillator (3) RCA-6SK7 I -F Amplifier (4) RCA-6SQ7. 2nd Detector, A.V.C., and A -F Amplifier (5) RCA -6F6 -G (7Q4) Output RCA -6F

4、6 (7QK4) (6) RCA -5Y3 -G Rectifier (7) RCA-6U5/6G5 Tuning Indicator LOUDSPEAKERS 7Q4 (RL -63K-2) 8 -inch electrodynamic 7QK4 (RL -70J-4) 12 -inch electrodynamic V. C. Impedance 2.2 ohms at 400 cycles POWER OUTPUT RATING Undistorted 2.5 watts Maximum 4.5 watts LOUDSPEAKER (RL -79A-2) 6Q4 Type 6 -inch

5、 electrodynamic V.C. Impedance 3.4 ohms at 400 cycles POWER SUPPLY RATINGS Rating A 105.125 volts, 50-60 cycles, 75 watts Rating B 105-125 volts, 25.60 cycles, 75 watts Rating C. 105.130, 140.160, 200.250 volts, 40-60 cycles, 75 watts Models 7Q4 and 7QK4 are similar to Model 6Q4 except for the addit

6、ion of a tuning indicator (RCA-6U5/6G5). The 7QK4 chassis uses an RCA -6F6 output tube, whereas the 7Q4 uses an RCA -6F6 -G output tube. RADIO PHONO FIDE LOW FIDELITY , MEDIUM FULL FULL MEDIUM/ EDIU / LOWS RADIO -PHONO TONE CONTROL Below-Controls MODELS 7Q4 therefore, a calibration scale is attached

7、 to the rear of the drum which is mounted on the front 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

8、in r -f alignment, check the position of the drum. 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

9、in the correct position. Pointer for Calibration Scale.-Improvise a pointer for the calibration scale by fastening a piece of wire to the gang- condenserframe, and bend the wire so that it points to the 180 mark on the calibration scale when the plates are fully meshed. C2 CS C44 6ANT. AANT xANT 6 M

10、C. 1300 KC 360 ; Kc. CI CANT. 20 MC. C 11 *6OSC. 6 MC. R. F Cd czSp Czl -X DCT. 360 KC. 1 4o C L 10 xoSC. ST.DET. 175 KC. 15TI.F TRANS. 7 2ND.! F1 TRANS. SEC. ADJ. 455 KC. ( t3Yl! JY3f i LIT SEC. AD.; / KC. 16 / C 20 , CCC12 CtS A Der CI, C-017.CbIC. L9 AOSC. xOSC. 1500 KC. 13- Dar 20 MC. 20 MC, A 0

11、5C. 150o KC. 560 KC. 6 MC. 600 KC. cv ru vICT RO CA JACK Dial -Indicator Adjustment.-After fastening the chassis it the cabinet, attach the dial indicator to the drive cable with indicator at the 530 kc mark, and gang condenser fully meshed. For additional details, refer to booklet RCA Victor Re, ce

12、iver Alignment. Steps Connect the high side of test-osc. to- Tune test- osc. to- Turn radio dial to- Adjust the following for maximum peak output 1 Turn tone control to 3rd position (sharp) from maximum counter -clockwise. 2 6SK7 I -F grid in series with .01 mfd. 455 kc A Band Quiet point between 55

13、0-750 kc L18 and L19 (2nd I -F trans.) 3 6SA7 grid in series with .01 mfd. L16 and L17 (1st I -F trans.) 4 Turn tone control to 4th position (broad) from maximum counter -clockwise and check I -F response which should be a slightly double -peaked curve. Leave tone control n 3rd position (sharp) for

14、the fol- lowing steps. 6Q 4 7Q4 5 Ant. terminal in series with 200 mmfd. 360 kc 360 kc (31.5) X Band 360 kc C15 (osc.)t (149 ) C21 (det.) C44 (ant.) 6 175 kc 175 kc (127.2) X Band 175 kc L10. (osc.) ) Rock gang 7 1,500 kc 1,500 kc (28) A Band 1,500 kc C12 (osc.)ff (152) C18 (det.) C3 (ant.) 8 600 kc

15、 600 kc (148) A Band 600 kc L9 (ose.) (32) Rock gang 9 Repeat steps 5, 6, 7. and 8. 10 Ant. terminal in series with 300 ohms 6 mc 6 me (30) B Band 6 mc CU (osa)* (149) C19 (det.) C2 (ant.) 11 20 mc 20 me (23) C Band 20 mc C9 (osc.)* (157) C20 (det.) Cl (ant.) * Use minimum capacity peak if two can b

16、e obtained. Check to determine that C11 has been by tuning receiver to approximately 5.09 me where a weaker signal should be received. * Use minimum capacity peak if two can be obtained. Check to determine that C9 has been by tuning receiver to approximately 19.09 me where a weaker signal should be

17、received. t Preset L10 core approximately 1/2 -inch out before adjusting C15. if Preset L9 core screw flush with apron before adjusting C12. Note.-Oscillator tracks above signal on all bands. adjusted to the correct peak adjusted to the correct peak 收音机爱 好者资料库 RadioFans.CN PAGE 113-C 694, 7Q4, 7QK4

18、Calibration Scale 1111111,1IIIIlIIIIIIIllf211IIIIIIIIIIIIIIIIIIIIII111tI11111IIIlII1Ii111If11111IlIIlIIIIIIIIIl11II1111111i111 IIIII111i11111IIi1111111111I1111u11iIl11IIl11IIlI1I11I11I1rIII1IIII 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 IO 0 .OP.CAI TROPICAL 51.040CAS, BROADCAST B

19、2.3 120m 90 2.5 2.7 3.0 3.5 TROPICAL MEXICO CITY - CHICAGO N. YORK BROADCAST vNA - BERLIN - PITTSBURGH 60m 49M CINCINNATI TORONTO p 4.0 5.0 6.0 7.0 MC B . R .Ii 1 .11.1.1rE11 A 550 600 700 800 1000 1200 1400 1700 550m 530m 450m 400m 350m 300m 250m 200m K C X 2000m 1800m 1600m 150 170 200 . I 1 1 1 1

20、 1400m 1200m 1000m 900m 800m 250 300 350 400 1 1 1 . . 1 K C X C 40m EASTERN HEMISPHERE RIO BERLIN PHILADELPHIA 31 m HONG KONG - SPEINGNELD ROME LONDON - SCHENECTADY MADRID 12 14 16 HUTZEN 25m PRAGUE RERAN - TOKYO PITTSBURGH LONDON ROME PARIS TOKYO 19m PAINS LONDON . SCMENY BERLIN - PITTS7;N 18 20 2

21、2 MC 16m MAIDEN 13m NEW YORK BERLIN LONDON BERLIN PITTSBURGH N YORK PARIS LONDON SCMENY 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 IO 0 1111111IIIIu111111111111IIII11111I1111IIIIII111iIIIIIIIIIIIIIIlIl1IIIll11I;!,i I1I1111I1I1tIlii!IL. i ;I1111I11IIIIIIIII111IIIIIIIIIII1111I2111I111

22、1IIIIIII11111111111111 Receiver Dial Scales, and Corresponding 0-180 Calibration Scales 6 Q 4 The corresponding position of the dial indicator 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 to cali

23、bration scale. For example, 28 on the calibration scale corresponds to 1,500 kc on A band. Read instructions under Alignment Procedure. O 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 150 110 200 250 300 350 400 Lll AY .P. . E. P. . . .P Inc.,.m oo 1000 coom eoom Inc. 1300n . 50 550

24、1n 500m 350m 000m 350m 300m 250m 200m 120myr AIRCRAE O.Om MTEU H40Lm 2.3 2.5 3. T 3.5 A4.0 . o. .lm 25m . v AM IYm . m 8 9 I 12 14 16 18 5.0 aern 6.0 ,H.,.,/ 13m (I 20 22 EHT.E. O 10 20 30 40 50 60 70 80 90 100 110 .20 130 140 150 160 170 180 1,iJ,i,l,i,l,i,l, ,1,i,l,i,l,(,1,i,l,i,l;,(.,1.,L,.,l.,i,

25、.,l,.1,.(.,1.,.i.,l.,(.,.,1 TUNING COmo. DRIVE CORO (FRONT GROOVE) INDICATOR DRIVE CORD (REAR GROOVE) PULLEY TUNING CONDENSER DRI E PULLEY CORD ARRANGEMENT PULLEY 27884 7Q4 70K4 Calibration Scale Frequency Calibration Degrees 175 kc 52.8 360 kc 148.5 600 kc 32.0 1,500 kc 152.0 6.0 me 150.0 20.0 me 1

26、57.0 TENSION SPRING BAND INDICATOR- BAND INDICATOR SHOWN IN SNORT WAVE -I BAND POSITION. lo PULLEY O BAND INDICATOR TENSION ADJUSTMENT DRIVE CORD DRUM - 0 0 PULLEY TENSION SPRING 6Q4 SN 1006 SHOWN WITH GANG AT MAXIMUM CAPACITY. 704 7QK4 PAGE 144-C 6Q4, Tou, 7Q01 U a J CO t/ ai. AlMOM9 M0113, E5 9g)

27、- .2 I- z o z N o w d V T O U V nrS en )I Jd18 - arng M u u32a9 /. i? MO113J, z 111 tt W ZJ cnJ oV x U 62D P 4 4 -r- -o N -vvY vooc.a O U: a toN ON UN f r- uw 000Zz.12i UQQ OYaH9 J PAGE .4.15-L: 64, 7Q4, 7QK14 .H V ds cr , a W - H m Z N tt u) -c012,- V F L(1 W L L N NQ e F wQ r rJ ZErv v3 Z WJw O J

28、p l9 m m m O m J l 4o2oJ LL - Uf E s p Eid Imp, p, J $,00 +, 000 ml -i TQO)Q N li O (- - m N, o. J tJ2 J J = rv J n X V i PAGE 446-C 60 7Q1 7Q104 MODEL 6Q4 Additional Replacement Parts: Stock No. 34662 Cord -Condenser drive cord 11761 Lamp -Mazda No. 51 35441 Cone -Cone complete with voice coil, sus

29、pension, and dust cap 34571 Knob -Range switch knob (brown) 34570 Knob -Tone control knob (brown) 34136 Knob -Tuning or volume control (brown) 34964 Knob -Range switch knob (black) 34983 Knob -Tone control knob (black) 34982 Knob -Tuning or volume control (black) :14296 Dial -Marked in kc (6Q4) VOL.

30、 CONTROL GEARS VOLUME CONTROL RANGE SWITCH SHOWN IN X RAMC) POSITION SET SCREW c WASHER RANGE SELECTOR SHAFT TUNING SHAFT TUNING DRIVE SPRING -+-m LINK AND ARM RANGE 5W BOTTOM Yaw OF CONTROLS REPLACEMENT PARTS MODEL 6Q4 WASHER Insist on genuine factory -tested parts, which are readily identified and

31、 may be purchased from authorized dealers. STOCK No. DESCRIPTION STOCK No. DESCRIPTION CHASSIS ASSEMBLIES 14281 Resistor -68 ohms, watt (R1, R17) (RC 441-A) 31388 Resistor -390 ohms, 1 watt (R10) 13716 Resistor -2,200 ohms, watt (R8) 34502 Arm -Operating arm between knob shaft and 33489 Resistor -15

32、,000 ohms 21 watt (R5) range switch shaft 13998 Resistor -22,000 ohms, watt (R7) 10194 Ball -Steel ball 12454 Resistor -33,000 ohms, watt (R3) 31767 33821 Board -Antenna -Ground board Capacitor -Trimmer capacitor -4 sections, 3 of 2-10 mmfd. and 1 of 3-30 mmfd. (C18, C19, 17440 12285 12679 12679 Res

33、istor -56,000 ohms, 1 watt (R16) Resistor -470,000 ohms, watt (R12, R13) Resistor -2 watt ( (RS) R4) Resistor-2.2eg.,watt 12714 C20, C21) Capacitor -Adjustable trimmer -2-12 mmfd. (C9, P l C11) 136017 34037 Resistor -10 meg., watt 1o) Retainer -Retaining washer for range switch shaft 33818 Capacitor

34、 -Trimmer capacitor -2 sections of 2-20 33772 Shaft -Range switch shaft mmfd. each (C12, C15) 33768 Shaft -Shaft and gear for tone control 33822 Capacitor -Trimmer capacitor -4 sections, of 3-30 33771 Shaft -Tuning shaft mmfd. each (Cl. C2, C3, C44) 14278 Socket -Single contact socket and plate for

35、12896 Capacitor -15 mmfd. (C43) phonograph input 13545 Capacitor -39 mmfd. (C16) 31251 Socket -Tube socket 12723 Capacitor -56 mmfd. (C24) 31418 Spring -Condenser drive cord spring 12720 Capacitor -100 mmfd. (C42) 13638 Spring -Indicator drive cord spring 32239 Capacitor -110 mmfd. (C26) 33769 Sprin

36、g -Planetary tuning drive spring 30232 Capacitor -200 mmfd. (C6) 33758 Switch -Range switch (S1, S2, S3, S4, S5, S6) 12694 Capacitor -220 mmfd. (C5, C17, C22, C32) 53759 Transformer -First i -f transformer (L16, L17, 33760 Capacitor -220 mmfd. (C25, C27, C28) C25, C26) 33235 Capacitor -580 mmfd. (C1

37、3) 33761 Transformer -Second i -f transformer (L18, L19, 12611 Capacitor -3,600 mmfd. (C10) C27, C28, R7) 31405 Capacitor -6,000 mmfd. (C7) 31734 Transformer -Power transformer 110 volts, 25 5107 Capacitor -.0025 mfd. (C34, C38) cycle (T1) 33584 Capacitor -.005 mfd. (C35, C38, C39) 31733 Transformer

38、 -Power transformer 110 volts, 60 32787 Capacitor -.05 mfd. (C30) cycle (T1) 4839 Capacitor -0.1 mfd. (C29, C33, C45) 31735 Transformer- Power transformer 105/130- 33014 Capacitor -Comprising 3 sections of 10 mfd, and 140/160-200/250 volts, 50/60 cycle (T1). 1 section of 20 mfd. (C37, C40, C41, C46)

39、 33762 Coil -Antenna coil A -B -C Band (L1, L2, L3, L4) SPEAKER ASSEMBLIES (RL 79A-2) 32823 Coil -Antenna coil X Band (L5, L6) 33763 Coil -Detector coil A -B -C Band (L11, L12, L13, 32907 Cap -Dust cap L14) 33966 Coil -Field coil (L23) 33765 Coil -Detector coil X Band (L15) 32906 Coil -Neutralizing

40、coil (L22) 33764 Coil -Oscillator coil A -B -C Band (L7, L8, L9). 32931 Coil -Oscillator coil X Band (L10) 33756 Condenser -Variable tuning condenser (C4, C8, 5118 Plug -3 prong male speaker plug C23) 32905 Transformer -Output transformer (T2) 33816 Control -Tone control (S7, 58) 33814 Control -Volu

41、me control and power switch (R9, S9) MISCELLANEOUS ASSEMBLIES 32635 Cord -Indicator drive cord 33799 Dial -Dial scale 32713 Core -Core and stud for oscillator coils 34295 Dial -Glass dial scale (Greek) Frame frame complete less dial 33770 Drive -Planetary tuning drive less balls, shafts, and shaft r

42、etainer 33797 -Dial assembly scale 33773 Drum -Variable tuning condenser drum and hub 33185 Gear -Gear and hub for volume control and switch 33774 Mounting -Speaker mounting hardware 33767 Link -Operating link between knob shaft and range switch 4982 Spring -Retaining spring for knob Stock No. 34136

43、 12471 Plate -Cushion socket mounting plate assembly less socket 14270 Spring -Retaining spring for knob Stock No. 34570 34138 Spring -Retaining spring for knob Stock No. 34571 PAGE 147-C 6Q4, 7Q4, 7QK4 MODELS 7Q4 & 7QK4 Replacement Parts Insist on genuine factory -tested parts, which are readily Id

44、entified and may be purchased from authorized dealers. STOCK DESCRIPTION STOCK O K DESCRIPTION ASSEMBLIES 17440 Resistor -56,000 ohms, 1 watt (R16) RC 478 A & B 12285 12013 Resistor -470,000 ohms, watt (R12, R13) Resistor -1 megohm, 1/10 watt 13730 Resistor -1 megohm, watt (R2, R4) 34401 Arm -Arm an

45、d hub for band indicator less cable 12679 Resistor -2.2 megohm, watt (R6) -fastens on range switch shaft 13601 Resistor -10 megohm, 1 watt (R11) 34400 Belt -Drive belt 30340 Retainer -Retaining clip for pulley Stock No. 31767 Board-Ant-Gnd terminal board 31373 32635 Cable -Cable and clips for band i

46、ndicator 34396 Shaft -Intermediate tuning drive shaft, and 33821 Capacitor -Mica trimmer -3 seections 2-10 mmfd. and 1 section 3-30 mmfd. (C18, C19, C20, C21) 34397 drive cord pulley less drive belt, pulley and set screws Shaft -Intermediate tuning drive shaft, and fly - 12714 Capacitor -Air trimmer

47、, 2-12 mmfd. (C9, C11) wheel -less drive belt pulley and set screws 33818 Capacitor -Mica trimmer, 2 sections 2-20 mmfd. 31364 Socket -Dial lamp socket each (C12, C15) 34864 Socket -Magic Eye socket 12896 Capacitor -15 mmfd. (C43) 11278 Socket -Phono. input socket 33822 Capacitor -Mica trimmer, 4 sections 3-30 mmfd. 31251 Socket -Tube socket each (C1, C2, C3, C44) 31418 Spring -Pointer drive cord tension spring 13545 Capacitor -39 mmfd. (C18) 34390 Switch -Range switch (Si, S2, S3, S4, S5, S8) 12723 Capacitor -