RCA-Victor-Co-Inc-HF-8 电路原理图.pdf

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1、PAGE 425-C HF -6, HF -8, U-132, U-131$ Model U-132 ALIGNMENT Alignment using the Cathode Ray Oscillograph is much the preferable method because of the variable selectivity features of these instruments. The curves shown below, illustrate the general shape of the i -f selectivity curves for different

2、 settings of the Fidelity control, when i -f channel is properly aligned. Connections for the oscillograph are shown in the top view of the receiver chassis. Use short, unshielded leads to oscillograph, and well -shielded leads from test oscil- lator. If possible, use 30 or 40 kc sweep frequency for

3、 i -f alignment. Output Meter Alignment.-If this method is used, corinect meter across voice coil, and turn receiver volume control to maximum. Disregard steps 4 and 7 of alignment table given below. However, a listening check should be made to check operation of Fidelity control, after receiver has

4、 been aligned. Test-Oscillator.-For all alignment operations, connect the low side of the test -oscillator to the ground terminal, and keep 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 b

5、e used for reference during alignment, therefore a calibration scale is attached to the rear of the drum which is mounted on the shaft of the gang condenser. The set- ting of the gang condenser is read on this scale, which is calibrated in degrees. The correct setting of the gang in degrees, for eac

6、h align- ment frequency is given in the alignment table. Pointer for Calibration Scale.-Improvise a pointer for the calibra- tion scale by fastening a piece of wire to the gang -condenser frame, and bend the wire so that it points to the 0 mark on the calibration scale when the plates are fully mesh

7、ed. Dial -Indicator Adjustment.-After fastening the chassis in the cabi- net, attach the dial indicator to the drive cable with indicator at the 530 kc mark, and gang condenser fully meshed. The indicator has a spring clip for atta iment to the cable. Spread -Band Alignment.-The most satisfactory me

8、thod 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 so that these stations come in at the correct points on the dial. PROCEDURE When a test oscillator is employed for spr

9、ead -band align- ment, 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 so that the stations come in at the correct points on the dial. For additional information, refer to bookle

10、t RCA Victor Receiver Alignment. Precautionary Lead Dress 1. C-31, C-32, C-33, C-35, C-36, C-40 should be con- nected with as short leads as possible. 2. Osc. Control grid lead should be dressed away from the high side of A Band Oscillator trimmer. 3. The lead from A Band R -F Coil to the R -F Tube

11、should be dressed away from chassis and shield. 4. Lead from A to C Band Antenna Coils should be dressed away from the shield. 5. The antenna leads inside the chassis should go directly to the terminals to which they connect. 6. The lead from the rectifier tube to the first filter ca- pacitor should

12、 be dressed away from the Victrola connection. 7. The leads to the push-button switches should be dressed away from the Victrola switch, and its associated parts. 8. The output transformer primary leads should be dressed down to the chassis. 9. The 2nd Detector Diode lead should be dressed away from

13、 the lead to the discriminator diode. This latter lead should be dressed down to the chassis. Additional Critical Leads-Models HF -6, U-132 10. Dress Pilot Light leads away from 6R7 grid cap. Additional Critical Leads-Models U-132, U-134 11. R-103 and R-102 should be dressed away from each other. 收音

14、机爱 好者资料库 RadioFans.CN PAGE i 26-C HF -6, HF -8, U-132, U-134 A. F. C. Alignment. -After receiver has been fully aligned, turn Fidelity control to No. 1 position, tune in a station of medium signal strength in the neighborhood of 550.650 kc, or, if it is necessary to use a local station for this sign

15、al, cut down length of antenna so that signal is about medium strength. Carefully tune in the station using the Magic Eye as an indicator. Tune test oscillator to 455 kc, turn output to maximum, and Modulation off. Connect Gnd side of test oscillator to chassis, and bring the lead from the high side

16、 of test oscillator near the grid lead of 1st detector, 6L7 tube, until a beat note can be heard in the loudspeaker. Do not bring lead any closer than 1 inch to grid lead of 6L7, or detuning of circuit will result, and the adjustment will not be accurate. Adjust frequency of test oscillator till bea

17、t -note heard in loudspeaker is at zero -beat. Turn Fidelity control to No. 3 position, and a beat note will again be heard. Adjust trim- mer, L32, bottom of 4th i -f transformer, till beat note heard is again at zero -beat Turn Fidelity control to No. 1 posi- tion, and check for zero -beat. When pr

18、operly adjusted turn- ing Fidelity control from No. 1 to No. 3 position should not affect zero -beat. With Fidelity control in No. 1 position, tune receiver off resonance. Turn Fidelity control to No. 3 position -station should fall into resonance due to A. F. C. action. Push in Tuning Control Shaft

19、 without turning it -station should again be off resonance as originally tuned. 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 27599 POLICE AIRCRAFT AMATEUR 62M AIRCRAFT 49M wp s B, , , , 2.5 . , . , . , 1 . . . 3.0 4.0 5.0 6.0 7.0 . MOSCOW v ATICAN CITY M N ITTS. PRAGUE ROSTON N.O

20、R ANO, A SCNl NY 110104 LONDON MIAKO LONDON IIRIN NUIIIN 1ARIS LONDON AR R. LONDON RARIw VOA 1l S, I I 1 15.10 15.15 15.20 15.25 15.30 15.35 15.40 25 CITY W-. TIMl CIT. -70.:,-7.:.,.,-.7;,. MI,- CITY LONDON ,FRAA Of10N .ARTS 25 I 1 , , 11.70 11.75 11.80 11.85 11.90 A. . . 55 STANDARD BROADCAST POLIC

21、E . A .,.I . 60 70 90 110 130 150 170 31 -,CO CITY COP.G. IIRSIN IERIN LONDON MOSCOW CnGINA NUID MADRID LONDON vuACRU2 SINE D 1114( ,.NAM. CITY ROMI AIRlS 31 1 , 9.50 9.55 9.60 9.65 9.70 49 GU.TIMAL CIT. ROSTON ORON,O N.ORR NM41EO MER. CIT. MARUIIO Ai1UN OTY mix CITY .RAN UNONNAO WCGO :O,.G11 CARACA

22、S CITY L. 49 1 I , 1 5.95 6.00 6.05 6.10 6.15 6.20 6.25 31M 25M ANTE 19M 16M 13M - - - - C C. . 7 . I I I 8 9 10 12 14 16 18 20 22 . IIII111ifilII111111f111111IlIlI111lITjifTTPIIlIIililllIII111IlI1111 IIIIII1111IIII11111IIIII11111II1I111111i1 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160

23、170 180 Reduced Reproduction of Receiver Dial, and Corresponding 0-180 Scale ADJUSTMENTS FOR ELECTRIC TUNING MAGIC EYE OFF ll 11111111111111111111111 .19 RANGE INDICATOR FULL TONE SOFT LOUD B ZS FUR TI0N , .E e ONLY DISMGZFi9 POWER -BASS VOLUME RANGE CONTROL CONTROL SELECTOR Location of Controls The

24、 left-hand push-button is a Victrola-Attachment switch. The right-hand push-button is for dial tuning. FULL RANOc FIDELITY TUNING CONTROL CONTROL 1. Make a list of the desired eight stations, arranged in order from low to high frequencies. 2. Turn range selector to A band, turn power on, and allow a

25、 few minutes for warming up. 3. Turn Fidelity Control maximum counter -clockwise. 4. Press down the dialtuning (right hand) button. 5. Manually tune in the first station on the list, using the Magic Eye for accurate tuning. 6. Hold down the dial -tuning button, and press down station button No. 1 (s

26、econd from left). Both buttons will stay down, central dial lamp will light brightly or dully, depending on which side of disc, the contact is. Move station -setting contact No. 1 to the insulating line on the disc at rear of gang. When the contact is correctly centered on the insulating line, the c

27、entral dial lamp will go out. 7. Press down any other button in order to release the dial -tuning button and station button No. 1. Then press down station button No. 1 again. The electric tuning mechanism will function to tune in the station, and the central dial lamp will stay on. 8. Repeat this pr

28、ocess for the remaining stations. 收音机爱 好者资料库 RadioFans.CN Alignment Table PAGE i27-C HF -6, HF -8, U -I32, U -I34 Step Connect High Side of Test Oscillator to- Tune Test Oscillator to- Range Selector Set Tuning Gang to- Adjust following for maximum peak output Check for Selectivity Curve No. 1 Turn

29、fidelity switch to maximum counter -clockwise (No. 1) position. 2 6K7 2nd I -F Grid. Cap in series with .01 mfd. 455 KC A Quiet Point Between 550 and 750 KC L21 3rd I -F Trans. L31 -L32 4th I -F Trans. 1 3 6K7 1st I -F Grid Cap in series with .01 mfd. 455 KC A L18, L19 2nd I -F Trans. 2 4 6K7 1st I

30、-F Grid Cap in series with .01 mfd. 455 KC A Turn Fidelity Control Clockwise to No. 6 position 3 Turn Fidelity Control Clockwise to No. 7 position 4 5 Turn Fidelity Control to maximum counter -clockwise (No. 1) position. 6 6L7 1st Det. Grid in series with 300 ohms Remove Grid Lead 455 KC A Quiet Poi

31、nt Between 550 and 750 KC L15, L16, 1st I -F Trans. 5 7 6L7 1st Det. Grid in series with 300 ohms 455 KC A Turn Fidelity Control Clockwise to No. 5 position 6 Turn Fidelity Switch Clockwise to position No. 6 7 Turn Fidelity Switch Clockwise to position No. 7 8 8 Turn Fidelity Control to maximum coun

32、ter -clockwise (No. 1) position. * NOTE: In Step 19 o n 1 y , oscillator tracks on low side of signal; use maximum inductance peak plungec in) if two peaks can be ob - tamed. All other os - cillator trimmers use minimum, inductance or capacity peak (plunger out), if two peaks can be ob - tained. 9 A

33、2 in series with 100 mmf, Al to Gnd. 600 KC A 600 KC 29 .L30, osc. 10 A2 in series with 100 mmf, Al to Gnd. 1,500 KC A 1,500 KC 152.5 C30, osc.; C5, ant.; C9, det. 11 A2 in series with 100 mmf, Al to Grid. 455 KC A 600 KC 29 L14, wave trap Minimum output 12 A2 in series with 100 mmf, Al to Gnd. 6,10

34、0 KC B 6,100 KC 147 C42, osc.; C2, ant. 13 A2 in series with 100 mmf, Al to Grid. 2,440 KC B 2,440 KC 15 L27, osc. 14 A2 in series with 100 mmf, Al to Grid. 6,100 KC B 6,100 KC 147 C42 15 A2 in series with 47 ohms, A3 to Gnd. 20,004 KC C 20,000 KC 156 C27, osc.; Cl, ant. 16 A2 in series with 47 ohms

35、, A3 to Gnd. 9,600 KC C 9,600 KC 57 L28, osc. 17 A2 in series with 47 ohms, A3 to Gnd. 20,000 KC C 20,000 KC 156 C27, osc. 18 A2 in series with 47 ohms, A3 to Grid. 9,600 KC 31M 9,600 KC 99 L26, osc.; C7, ant.; C13, det. 19* A2 in series with 47 ohms, A3 to Gnd. 6,100 KC 49M 6,100 KC 103 C41, osc. 2

36、0 A2 in series with 47 ohms, A3 to Gnd. 11,800 KC 25M 11,800 KC 90 L25, osc. 21 A2 in series with 47 ohms, A3 to Gnd. 15,200 KC 19M 15,200 KC 79 L24, osc. 22 Proceed to A.F.C. discriminator adjustments. RETURN TRACE RETURN TRACE 2 3 4 5 I -F Selectivity Curves 6 7 8 收音机爱 好者资料库 RadioFans.CN PAGE 128-

37、C HF -6, HF -8, U-132, U-134 G AI A2 A3 CAPACITORS C75. C-18 E. C77 ARE MOUNTED V 1125 05C. HORIZONTALLY IN MODEL U-132 25M 11,BOOK.C. 126 05C. 128 05C. ND 9600KC. / 96011.C. -lL:OSC.c 9M 13,200/4.0 YELLOW 6J7 OSC: T1 5T4 REGT TO VICTROLA JACK 1/4 1 TO TO VOL CONI C52 510 ROD4 7 BROWN -BLACK LOI 05c

38、 TO TUMNG/ 2440OC MOTOR - 1 WAVE TRAP / L14 455 N.C. co o 6 NOISE TRIMMER L30 W BAND 600 K.C. C30 05C. W BAND 1500 K.0 8LAC 88owN 5 4Z3 z t 6J7 B T B T e OSC.CONTROL c42 ox. B- BAND 610014 C e5C41 OSC 4. 6100119M C. T2 OUT PUT TRANSFORMER 6U5 TUNING INDICATOR .5ANT C BAND 20,000 N.0 bd C27 SSC. C BA

39、ND . 2000 K.C. 0 C9 OCT iX BAND 1300K C CS ANT. BAND 150 K C C2 ANT B BAND 6100 KC 6F6 6JS OUTPUT INVERTER 6F6 6J5 OUTPUT 2 A.F. SEC. ADJ L19 455 N.0 6L7 15r I.F. 2I.E 1sT DET TRANS. 6K7 TRANS. s 12 0 C13 DET 31M 9600K.0 C7 ANT SIM 9600K C TO PILOT LAMP- BLACK SEC ADJ. LIb 455 K.0 6K7 R.F, 5 6R-1 2M

40、0. DET. 4 MUTING 4 C 1sT A.F. GREEN Z- 5 IO 15 Y. 55 Y6 5; rcr fy 1 1 1 1 1 1 BLACK BROWN BLUE GREEN RED RED -BLACK RED -YELLOW BROWN- BLACK YELLOW 16H6 61(7 DISCRIMINATOR.ZI.F SEC ADJ L31 - 455 K.C. 1 3 LE TRANS. l / , c KKK AFC OFF MANUAL TUNING SWITCH / II OSCILLOGRAPH Hi TO THIS TERM SELECTOR DI

41、SC LOW TO CHASSIS CAPACITORS C75 C76, -C78. C/7 ARE MOUNTED HORIZONTALLY IN MODEL U-134 5T4 REGT YELLOW 6J7 OSG. . 514 RECT. RECT. To VICTROLA JACK G AI A2 A3 124 05C. 19M. 15,200 K.C. 0.E048LK. BROWN L25 O5C. 25M II,B00KC B T B T - BLACK 5 S WAVE TRAP / 114 1455 N.C. C8 DET. NOISE TRIMMER 6U5 TUNIN

42、G INDICATOR .0SIANBANDT 205000 KC TO VOL CONI BLACK AF.C. 8,L SEL. SWITCH ON TUNING SHAFT 6K7 2NOIF FRONT *56 ZO LLL W 01 SELECTIVITY AND A EC SW. R15 R14 .C46 1000n T0.1 MFD. 4 i2 RII 22,00041 R13 1 MEG. BLACK STATION SELECTOR SW * NOTE 55 2.2MEG1- PICKUP I II T- -+- -71ISWITCH 1 r -4- _i_ ,: R 101

43、 1I 5107./ 1 T i_j 1.2 MEG. X-L-JC104 i Bz L_ _ MMF. r CRYSTAL T PICKUP C 105 .0025 MFD. DOTTED LINES INDICATE i PORTION OF SCHEMATIC DIAGRAM APPLYING TO . R102 MODEL U-132 1.2 MEG. ONLY. _1_ vv 6r lJ I MOTOR M2 I 5102 L_- 96n 609 72.3.9 50-609 105.9 259 - C70 .05 MFD. n d a a BLACK BROWN STATION SE

44、LECTOR IL DIAL LAMP FIELD L 36 1800 n o C77 d 16 MED. C75 25_ aa 2f 7C B MED. T T16 O a m MFD BROWN -BLACK-, V Q m w m O L37 HUM NEUT COIL L38 GREEN TI GREEN Oj BROWN 195 A 26O qqQ 259 9 BROWN, TO HEATERS C; AND SPREAD BANDS. VIEWED FROM FRONT OF CHASSIS. C31 C32 C33 25 155 62 FRONT MMF MMF. MME 53

45、L27 L29 28 B 49 M. L 28 1C27 2-8 MME CC o/ o C35 10 MMF. C36 C37 C38 8000 2500 5- MMF MME MME e C 41 2-20 MMF C40 I 120 MME. THRU CONNECTION / 042 - 2-20 MME C34 120 = MME R27 /33,000n ! C43 - am) MMF. C39 II -536 0 MMF . C44 .05 MFD. 6J7 05C e 3 0 22,000AL R12 1320A R 13 1 MEG. C45 15 MMF. G J 7 05

46、C. CONTROL. A -I C29 470 L30 _ MMF 4.6+ 1000nIC287- C30 = .05 Mr 2-8 MFD. MMF. VNM. 56.000lL * NOTE 55 - b. - i; v m d L M O iF N y cd 3, w 7 d y 7O. L Fd O z * .,b L 8 135-C HF -6, HF -8, U- 132, U-134 cr 0 ._. X .b O Q C . d ._ N,t L3 3 .ti v y L tf - . b = C N N 3 ,._ L O g, E * c E ti a C N-2.2,

47、- roi L cd fy u d ro u E E E 73 E L v -o 3 q o n. +l w v1 II_d CC y G b v Ln tip d L i o 3 N N d0 % 7 c V y C d -0 3 / L . g d %- CI) a o m v . . . * .b v N N tE N 01 ro x .F E+oi Oo1 z= * r s PAGE 136-C HF -6, HF -8, U-132, U- 134 MODELS HF -8 AND U-134 REPLACEMENT PARTS Additional Replacement Part: Stock No. 31566 Pull -Cabinet door pull Insist on genuine factory -tested parts, which are readily identified and may be purchased from authorized dealers. STOCKI o. DESCRIPTION ST1OoCK DESCRIPTION RECEIVER ASSEMBLIE