RCA-Victor-Co-Inc-U-123 电路原理图.pdf

《RCA-Victor-Co-Inc-U-123 电路原理图.pdf》由会员分享，可在线阅读，更多相关《RCA-Victor-Co-Inc-U-123 电路原理图.pdf（25页珍藏版）》请在收音机爱好者资料库上搜索。

1、收音机爱 好者资料库 RadioFans.CN PAGE 687-0 MODELS U-121, U-123, and U -127E CHASSIS No. RC -348J RC -348H (Single -Band) RC -348L Models U-121 and U -127E have a non -automatic Victrola mecha- nism, with crystal pickup, automatic stop, and self-starting constant - speed motor. Model U-123 has an automatic V

2、ictrola mechanism which permits playing seven 12 -inch or eight 10 -inch records in succession. It has a crystal pickup and constant -speed self-starting motor. Model U-121 (Manual) RC -421 (Two -Band) Six -Tube, Electric -Tuning, A -C, Victrolas Model U -127E (Manual) Electrical and Mechanical Spec

3、ifications Frequency Range 540-1,720 kc POWER OUTPUT (RC -348J, 348H, and 348L) RC -421 also has a short-wave band of 5.8-18.0 me Undistorted 2 watts, Maximum 4 watts PUSH BUTTON RANGES (RC -348J, 348H, and 348L) Two stations between approximately 550- 980 kc One station between approximately 690-1,

4、225 kc Two stations between approximately 850-1,500 kc PUSH BUTTON RANGES (RC -421) One station between approximately 550- 980 kc One station between approximately 590-1,020 kc One station between approximately 690-1,225 kc Two stations between approximately 890-1,500 kc TUBE COMPLEMENT (1) RCA -6A8

5、 -G (6SA7 in RC -421) First -Detector, Oscillator (2) RCA -6K7 Intermediate -Frequency Amp. (3) RCA -6H6 Second -Detector, A.V.C. (4) RCA -6F5 (6SF5 in RC -421) Audio Voltage Amplifier (5) RCA -6K6 -G (6F6 -G in RC -421) Power Output (6) RCA -5Y3 -G Full -Wave Rectifier Loudspeaker (electrodynamic)

6、Diameter Voice -Coil Impedance at 400 cycles Push -Button Ranges in RC -348J, 348H, and 348L (Single -Band Receivers) No. 1 and 2 Approximately 650- 980 kc No. 3 Approximately 690-1,225 kc No. 4 and 5. Approximately 850-1,500 kc Model U-123 (Automatic) POWER OUTPUT (RC -421) Undistorted 2.5 watts, M

7、aximum 4.5 watts POWER SUPPLY RATINGS A-6 105-125 A-5 105-125 B-2 105-125 C-6 105-125/210-250 C-5 105-125/210-250 U-121 U-123 (RC -348H) RL -70F-3 RL -70F-3 12 -inch 12 -inch 2.2 ohms 2.2 ohms Adjustments for Electric Tuning s a s 2 i d) te -.- ANT. TRIMMERS OSC. CORES These -modela have six push bu

8、ttons. The right-hand button con- necta the gang condenser for dial tuning. The other five buttons are for electric tuning of five different stations in the standard -broadcast range. The station buttons connect to separate magnetite -core oscil- lator coils and separate antenna trimmers which must

9、be adjusted for the desired stations. Use an insulated screwdriver or alignment tool such as RCA Stock No. 81031. Allow at least five minutes warm-up period before making adjustments. Use a regular antenna for the preliminary adjustments. The procedure is as follows: 1. Make a list of the five desir

10、ed stations, arranged in order from low to high frequencies. 2. Push in the dial -tuning butta., and manually tune in the first station on the list. U-123 (RC -421) RL -70H-6 RL -63H-5 12 -inch 8 -inch 2.2 ohms 2.2 ohms volts, 60 cycles, 100 watts total volts, 50 cycles, 100 watts total volts, 25 cy

11、cles, 100 watts total volts, 60 cycles, 100 watts total volts, 50 cycles, 100 watts total U -127E Push -Button Ranges in RC -421 (Two -Band Model U-123) No. 1 Approximately 550- 980 kc No. 2 Approximately 590-1,020 kc No. 3 Approximately 690-1,225 kc Nos. 4, 5 Approximately 890-1,500 kc 3. Push in s

12、tation -button No. 1 and adjust No. 1 oscillator core to receive this station. Screw the core all the way in, to lowest frequency, and then unscrew slowly until the station is received: 4. Adjust No. 1 antenna trimmer for- maximum output on this station. 5. Adjust for each of the remaining four stat

13、ions in the same manner. (Clockwise adjustment of oscillator cores and antenna trimmers tunes the circuits to lower frequencies.) 8. Make a final careful adjustment of the oscillator cores using one or two feet of wire as an antenna. The phonograph motor is a self-starting constant -speed induction

14、type. Motor Lubrication (Models U-121 and U-127E).-Apply a few drops of light machine oil to the spindle bearing and oil hole every six months. The oil hole is located in the motor casting, adjacent to the spindle bearing, and has a screw plug. The automatic stop (Models U-121 and U -127E) should be

15、 adjusted so that the lever will snap to the off position when the pickup needle is 11 inches from the center line of the spindle. REFER TO INDEX FOR DATA ON AUTOMATIC RECORD CHANGER 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 688-C U- 121

16、, U-123, U- 127 E Alignment Procedure Cathode -Ray Alignment is the preferable method. Connections for the oscillograph are shown in the chassis drawing. Turn the receiver volume control to maximum. Output Meter Alignment.-If this method is used, connect the meter across the voice coil, and turn the

17、 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. Calibration Marks.-The tuning dial is fastened in the cabinet and can not be used

18、for reference during alignment. Therefore calibration marks corresponding to dial readings of 600 kc and 1,500 kc have been stamped in the plate on the front of the chassis, as shown in the accompanying drawing. These marks are used for reference dur- ing alignment. RC -348J, RC -348H, and RC -348L

19、Steps Connect the high side of test-osc. to- Tune test- osc. to- Turn radio dial to- Adjust the following for max. peak output 1 6K7 I -F grid cap, in series with .01 mfd. 455 kc Quiet point between 550-750 kc L7 and L8 (2nd I -F Trans.) 2 6A8 -G grid cap, in series with .01 mfd. 455 kc L5 and L8 (1

20、st I -F Trans.) 3 Antenna lead (blue) in series with 200 mmf. 1,500 kc 1,500 kc calibration mark C8 (osc.) * C3 (ant.) 4 Follow Adjustments for Electric Tuning. * The oscillator section of the gang condenser has two trimmers, one on top, accessible through a hole in the chassis, and the other on bot

21、tom. It may be necessary to adjust both of these trimmers to secure a peak on 1,500 kc. C33-OSC. rsooHL Zwo DET. if it is not, move the pointer the required distance along the cord. For additional details, refer to booklet, RCA Victor Receiver Alignment. RC -421 (Two -band Model U-123) Steps Connect

22、 the high side of test.-osc. to- Tune test- osc. to- Turn radio dial to- Adjust the following for max. peak output 1 6K7 I -F grid cap, in series with .01 mfd. 455 kc Quiet point between 550-750 kc L8 and L10 (2nd I -F trans.) 2 Stator of ant. section of gang 455 kc L7 and L8 (1st I -F trans.) 3 Ant

23、enna lead, in series with 200 mmf. 600 kc 600 kc calibration mark L6 (osc.) 4 1,500 kc 1,500 kc calibration mark Cll (osc.) C3 (ant.) 5 Repeat steps 3 and 4. 6 Antenna lead, in series with 400 ohms 15.2 me 15.2 me calibration mark C10 (osc.)* 7 Follow Adjustments for Electric Tuning. * Rock gang for

24、 maximum output while adjusting C10. Note.-The oscillator tracks above the signal on both bands. At left-Tube and trimmer location for single -band chas- sis, RC -348J, RC -348H, and RC -348L. At right-Tube and trim- mer location for double -band i O chassis RC -421. 1 m m RA.NO2:-TUNING CONTROL BRO

25、ADCAST SNORT WAVE PUSH RANGE BUTTON TUNING PHONO PHOND-RACO SWITCH s 4 3 2 1 POWER -TON. SOFT-OUD POWER -TONE -VOLUME CONTROL U-123 (RC -421). Model U-121 U-123 (RC -348H). RATE 3419 OIRL INp,CRTOR 9PRING - SI4E0 SHB SISTSrT N.IDewroet DlNr COCO 1 DMi19SMRNNO q pN M/-pp(tK p 427f.r rNrTp b0 DRUM BRO

26、WN WITH CANC. RT MRXIM1:M1 CRPEICITY LOUD FULL TONE - POWERT r4e 2 3 4 . 5 DIAL TUNING CS -ANT. 1500 KC C26 C27,C24 C8 sr DET. o. 200v. 8 I.60CT. C OSC. C4 56 MM LS T OTC. COIL /260V. c 7 7t Ca Igo 16, IF Kiwi 6K 7 1.1F. 41 Cto 4 MfD. 6M6 2-R pET. A.ut. BOTTOM VIEW OF I TUBE SOCKETS RI7 C34 140000 .

27、02S644tD. I c10 I C12 .L IOC I0 MMF 6 /MMFi + LT LB ARIO I VOWME 2 I.F TRMat 2NN CONTROL 1 t50,000.n PAGE 689-C U-121, U-123, U -127E 6F5 AUDIO 6K6-0 OUTPUT E (13 IAI MFG K 3 Q Cl 5 V 3-G REGT. GREENS FIELD LU 1250n C -U s 0.1 MFD- PLUG AUTOMATIC SWITCH .1 4 I Y 70 MMF 09 16V. s1I5 V. C14 I1 D TY C6

28、I L S rc8 OOs2 5 t MFD. PICKUP 526 U-121, U-123 (Single -Band), and U -127E Precautionary Lead Dress.-(1) Dress green lead from antenna coil to switch away from the chassis and gang. (2) Ground bus from 6H6 socket must he close to chassis. (3) Dress leads away from 6 S A7 l? DET.-OSC. .215V. 6K7 A A

29、 AP c CTPFI - cKF. 17 1- R4 44 97N 4s 1101O MM, MMF. MME RANGE SWITCH SHOWN FROM FRONT IN PUSH-BUTTON POSITION (0000718 -CLOCKWISE) I. F. I MOTOR BLUE BLACK C15 .005 245Y/vD 260v. 375. TONE CONTROL R14 500,00C n RC-54014IJ.L cT I RIB 7 ? 820.000n/21 yr 9- PHONO 7 RADIOm R 30-I.O ME05. (I .127E ONEv)

30、 RADIO -PHONO SW. 527 (REAR VIEW) SHOWN IN PHONO. POSITION oscillator coil adjustment screws. (4) Dress power transformer primary leads toward left-hand end of chassis. (5) Dres plate lead from out- put tube close to chassis. 61-16 2N3 PET. A.V.0 BOTTOM VIEW OF TUBE SOCKETS MI.Q76.V5. i f- AI T MT 1

31、 r 1V NKFT 20,000 BLACK VOL. BLUE COIT6OLC b,cT0lw00 sa RODIO -PH0N0. SWITCH Rt ss 1.5 MES HOWN IN -PHONO POSIT -ION C15 VAMP CRYSTAL YAPICK UP PLUG) T1 GO Pt A.F. Rio IO M20. 6 FO -G OUTPUT e t4 20H20 R12 fD- - I7 RE 021 Cu .005 HFO 5 easy. 275 V, t-69743-0 SY3-6 La RECT PI -LP B TOMf IOMFD 10. Lia

32、i IN AN+. COIL LS L6 -TAP OSO. COIL C26 9 sQ _C21 A C24-s.0 .7 C0 ELECTROLYTIC CATHODE CURRENTS (1165A7 12.6131A )6K7 14.5MA 9)6H6 _- MA BIBQF d2d MA TOTAL RECTIFIED 15 10. FLA 88743 RC -421 (Two -Band Model U-123) 41iIAl i55 Note the following additional Il -c resistances: Voice -coil, 2 ohms; prim

33、ary of output transformer 375 ohms. KU -cycle power transformer, primary 9 ohms, secondary 735 ohms. Precautionary Lead Draa.-Dress the oscillator grid condenser (CT) away from chassis. Leads along back of chassis must be dressed in corner of chassis and away from contact E of 2nd i -f transformer.

34、Keep a -c leads against end of chassis. Dial drum must he 5/32 -inch from front apron. TAP L6 PAGE 690-C U-121, U-123, U -127E Replacement Parts Models U-121, U-123 (Single -Band), and U -127E Insist on genuine Factory -tested parts, which ars readily identified and may be purchased from authorized

35、dealers. STOCK No. DESCRIPTION STOCK No. DESCRIPTION CHASSIS ASSEMBLIES 32610 Rest -Rubber rest for pickup arm (U121-RC348J) (U123-RC348H, Single -Band) 30100 32743 Springs -One set of springs for automatic brake Switch -Radio -Record switch (S27) (U127E-RC348L) 14804 Switch -Switch only for automat

36、ic brake (S26). 32339 Capacitor -Capacitor bank for push button switch 31463 Turntable-Rec,rni Turntable. assembly (C20, C21, C22, C23, C24) 11865 Cup -Used needle cup. 12723 30904 13003 Capacitor -56 mmfd. (C4) Capacitor -100 mmfd. (C7, C8, C9, C10) Capacitor -180 mmfd. (C12) MOTOR ASSEMBLIES Model

37、 U-121 and U -127E 12488 Capacitor -270 mmfd. (C32) 31464 Damper -Comprising 1 rubber spindle sleeve and 31435 Capacitor -750 mmfd. (C25) 1 metal damper plate 4838 Capacitor -.005 mfd., 1,000 volts (C15, C29, C30) 32852 Field -Motor coils a n d laminations, 105-120 volts, 25 -cycle 14393 Capacitor -

38、.01 mfd. (C13, C14) 32650 Field -Motor coils a n d laminations, 105-120 4870 Capacitor -.025 mid., 400 volts (C34) volts, 50 -cycle 30882 Capacitor -.05 mfd., 200 volts (C11) 32336 Field -Motor coils a n d laminations, 105-120 30899 Capacitor -0.1 mfd., 200 volts (Cl, C31) volts, 80 -cycle 32342 313

39、82 32338 31098 31415 32340 Capacitor -10-10 mfd. electrolytic capacitor (C16, C17) Clip -Coil and core clip for push button oscil- lator coils Coil -Antenna coil (L1, L2) Coil -Oscillator coil (L3, L4) Coil -Push button oscillator coil, 550 to 980 KC. (L12, L13) Coil -Push button oscillator coil, 69

40、0 to 1,225 KC. (L14). 32638 32837 32558 30870 32653 32651 32337 Motor -105-120 volts, 25 -cycle Motor -105-120 volts, 50 -cycle Motor -105-120 volts, 60 -cycle Plug -2 -contact male for motor leads Shaft -Turntable shaft and gear for 25 -cycle motor Shaft -Turntable shaft and gear for 50 -cycle moto

41、r Shaft -Turntable shaft and gear for 60 -cycle motor 31383 Coil -Push button oscillator coil, 850 to 1,500 SPEAKER ASSEMBLIES (RL -70F3) KC. (L15, L16) Models U-121 and U-123 (Single -Band) 31422 Condenser -2 -gang variable tuning condenser (C2, C3, C5, CO, C33) 13866 Cap -Dust cap for cone center

42、32355 Control -Volume and tone control and power 12012 Coil -Field coil (L16) switch (R5, R14, S1) 11469 Coil -Hum neutralizing coil (L15) 32634 Cord -Drive cord 31275 Cone -Speaker cone and voice coil (L14) 31386 Core -Core and stud assembly tor push button 31302 31300 Plug -4 -contact male plug Sp

43、eaker -Speaker complete 31421 oscillator coils Drum -Tuning drive drum and hub 14358 Screw -Screw, washer, and lockwasher to hold core in yoke 11891 32136 Lamp -Dial lamp Lead -Phonograph input shielded lead and con- nector (U-121 and U-123) 31301 14357 Transformer -Output transformer (T2) Washer -S

44、pring washer to bold field coil 32908 Lead -Phonograph input shielded lead a n d socket (U -127E only) SPEAKER ASSEMBLIES (RL -63H5) Model U -127E 31419 30868 Plate -Dial color plate Plug -2 -contact female for motor leads 14356 13866 Board -3 -contact speaker terminal board Cap -Cone center dust ca

45、p 31420 Pointer -Dial indicator pointer 12012 Coil -Field coil. 31373 Pulley -Tuning indicator drive pulley 11469 Coil -Hum neutralizing coil 31388 Resistor -390 ohms, 1 watt (R9) 31310 Cone -Speaker cone and voice coil 14559 Resistor -10,000 ohms, watt (R17). 31302 Plug -4 -contact male plug for sp

46、eaker 12738 Resistor -27,000 ohms, watt (R10) 14358 Screw -Screw, washer, and lockwasher to hold 12286 Resistor -56,000 ohms, watt (R2) core in yoke 13734 Resistor -120,000 ohms, watt (R16) 31453 Speaker complete 12199 Resistor -270,000 ohms, watt (R7) 14355 Transformer -Output transformer 30963 Res

47、istor -820,000 ohms, watt (R18) 14357 Washer -Spring washer to hold field coil 30208 12679 Resistor -1.2 meg., watt (R30) (U127E only) Resistor -2.2 meg., watt (R4) MISCELLANEOUS ASSEMBLIES 13601 Resistor -10 meg., watt (R6) 32798 Button -Push button 31425 Resistor -Voltage divider resistor tapped a

48、t 22 ohms, 18,000 ohms, 8,200 ohms, and 3,900 13103 Cap -Pilot lamp cap (bullseye) (For Model U-123 only) ohms (R15, R12, R3, R11) 31487 Clip -Spring clip to mount dial scale 14887 Retainer -Indicator drive pulley retainer 31095 Cover -One set protective discs for call letter 31482 Screw -No. 8 square head set screw for drive markers drum 32742