RCA-Victor-Co-Inc-RC-418B 电路原理图.pdf

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1、MANUAL OF 1940 MOST POPULAR SERVICE DIAGRAMS 收音机爱 好者资料库 RadioFans.CN PAGE 299-C Five -Tube, Single -Band, A -C, Superheterodyne Victrola Electrical and Mechanical Specifications FREQUENCY RANGE Standard Broadcast and one Police Band 540-1,720 kc INTERMEDIATE FREQUENCY 455 kc NUMBER OF PUSH BUTTONS S

2、ix TUBE COMPLEMENT (1) RCA-6SA7. 1st Detector-Oscillator (2) RCA-6SK7 I -F Amplifier (3) RCA -6S07. 2nd Det., A.V.C., A.F. (4) RCA -6F6 -G Power Output (5) RCA -5Y3 -G Rectifier PILOT LAMP (1) Mazda No. 51, 7.5 volts, 0.2 amp. LOUDSPEAKER (RL -78-6) Type 5 -inch electrodynamic Voice Coil Impedance 3

3、.4 ohms at 400 cycles PICKUP Crystal Pickup Impedance. 0.1 meg. at 1,000 cycles PHONOGRAPH MECHANISM.- The phonograph motor is self-starting and operates the turntable through friction drive between the motor spindle and the: rubber tire on the underside of the turntable. The rubber driving tire on

4、the turntable should never be removed since it is grounded in to be concentric with the spindle. If replace- ment is required, the entire turntable should be replaced. The speed regulator raises and lowers the motor. This changes the driving ratio between the motor and the turntable due to the motor

5、 spindle being conical in shape. It is important to adjust this regulator for a turntable speed of 78 r.p.m. WHILE PLAYING A 10 -INCH RECORD WITH THE NEEDLE APPROXI- MATELY ONE INCH FROM THE OUTER EDGE OF THE RECORD. Lubrication.-The motor should he lubricated as follows: Place a SOFT OFF - tpAD101

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8、Cl O 3 c N. p 7 O C Bzzp . _m .t . in V ti O . w + O I-0- O O a Q ? O E W G p .d CD = 3 . s -I _J g $ M JQ = Q-r. - o a. Ca J LL r- ou_ u-1 m w iX i e LL F m v ov O . L ro, _ NO co U E c E o o -, .o r _ w 7 T * v, D .+ b -2 E C. p L ,b. C L a x I g k y E ., C W E ., C r4 L L) Y A A 2 E er A , 2 L VI

9、 t W E , W o R- a _.w v to .5 , -J c E c C vN.iQ -o qLK V- O C m, 5 3 u i. c _ ro D C: GC C: o al, U,:. 收音机爱 好者资料库 RadioFans.CN PAGE 301-C 51, 52 TONE u-10 TUNING CONTROL SW. R4. VOL. CONTROL CONTROL a RAD. -TEL.& II 53. POWER SW. Alignment rocdire I VICTROLA 2. C 2 C5 Cathode -Ray Alignment is the

10、preferable method. Connections for 1500 KC. 1500 KC. the oscillograph are shown on the chassis drawing. L1 - OSC. 600 KC C1 C4 3 6SQ7 2ND. DET. AF_AVG. Output Meter Alignment.-If this method is used, connect the output meter across the voice coil, and turn the receiver volume con - trol to maximum.

11、ANT. COIL CIO, C11 455 KC. OUTPUT Test Oscillator.-For all alignment operations, connect the low side of the test oscillator to the receiver chassis, and keep the oscillator ,-Th 6F6G output as low as possible to avoid a -v -c action. TRANS. TRANS L9 L10 1 1.F B 0 , TI POWER Calibration Marks.-The t

12、uning dial is fastened in the cabinet and can not be used for reference during alignment. Therefore calibration marks have been stamped in the plate on the front of the chassis as I IST. DET. 6SA7 B 2 5 6SK7 C IT 5Y3G TRANS. shown in the accompanying drawing. These marks are used for reference durin

13、g alignment. OSC. 0 C18 Dial Indicator Adjustment-With the gang condenser in full mesh, left frequency) the indicator should point to the extreme (low mark 7 L, on the dial scale. A G L 455 KC. rEL VICTROLA RECT.For additional details, refer to booklet RCA Victor Receiver JACK JACK RC 4185-Sri-952 A

14、lignment. PULLEY )-V-U- 1sec. MsooKC I ,.-15001I. Steps Connect the high side Of the g test-osc. to- Tune test to- Turn radio dial to- Adjust the follow - ing for maximum peak output MAX. / CAPACITY N N PULLEY N Antenna Quiet Point between C10 and C1l (2nd I -F trans.) PLATE N INDICATOR DRIVE CORD I

15、l 2 Terminal 455 kc 1,720-1,500 kc C6 and C7 (1st I -F trans.) N oaLT ) INDICATOR N u r . 3 Ant. terminal 1,500 kc 1,500 kc calibration mark C5 (osc.) C2 (ant.) N in series with 3TuANs DRUM SHOWN WITH GANG AT I 4 200 mmfd. 600 kc 000 kc calibration mark Ll (osc.)* I MAXIMUM CAPACITY. 5 Repeat step 3

16、 DRUM Note.-Oscillator tracks above s gnat. OIAL MECHANISM AND CALIBRATION MARKS. * Rock gang condenser slightly while adjusting I.A. Replacement Parts Insist factory Identified be how daslses. on genuine -tested parts, which are readily end may purchased authorised STOCK DESCRIPTION STOCK N DESCRIP

17、TION 33719 33718 12725 12694 32599 12537 30303 33584 4937 14393 11315 32787 4839 33724 33775 32342 33776 32634 33633 11785 33431 33727 30868 31388 14075 33489 12454 12412 12286 12285 12679 13601 33725 31319 31364 31365 33514 33720 33894 33722 33895 33619 33112 ASSEMBLIES (RC -418B) Belt-Tuning unit

18、push arm belt Board-Antenna-Ground terminal board Capacitor -150 mmfd. (C12) Capacitor -220 mmfd. (C14) Capacitor -430 mmfd. (CS) Capacitor -560 mmfd. (C20) Capacitor-.0035 mfd. (C19, C22) Capacitor-.005 mfd. (C16) Capacitor-.01 mfd. (C15) Capacitor-.01 mfd. (C13) Capacitor-.015 mfd. (C21) Capacitor

19、-.05 mfd. (C8) Capacitor -0.1 mfd. (C9) Coil-Oscillator coil Coil-Antenna coil (L9, L10) Condenser-Electrolytic, 2 sections 10 mfd. each Control-Volume control and power switch (R4, S3) Cord-Drive cord Indicator-Dial scale pointer Lamp-Dial lamp (Mazda 51) Link-Antenna link Plate-Dial plate assembly

20、 Plug -2 contact female plug for speaker cable Resistor -390 ohms, 1 watt (R8) Resistor -8,200 ohms, watt (R9) Resistor -15,000 ohms, 211 watts (R2) Resistor -33,000 ohms, watt (Rl) Resistor -47,000 ohms, watt (R10) Resistor -58,000 ohms, watt (R11) Resistor -470,000 ohms, 3 watt (R6, R7) Resistor -

21、2.2 megohms, watt (R3). . Resistor -10 megohms, watt (R5) Shaft-Tuning knob shaft Socket-Tube socket Socket-Dial lamp socket Socket-Lamp socket Socket-Phonograph input socket Spring-Push arm return spring Switch-Tone, Radio -Phono, or Television switch (Si, S2) Transformer-First i -f transformer Tra

22、nsformer-Second i -f transformer (L4, L5, C10, C11) Transformer-Power transformer 105-120 volts, 25-60 cycles (T1) Transformer-Power transformer 105-120 volts, 50-60 cycle (T1) 31575 33726 33897 33902 34496 33896 33591 33898 33122 32907 32906 33601 32904 32905 33731 31456 32625 33729 33637 33972 130

23、88 30883 33942 33973 33901 30870 31048 30900 31184 33900 33899 Transformer-Power transformer 110-220 volts, 80 cycle Washer-C washer for tuning shaft MOTOR ASSEMBLIES Base-Motor base and ball assembled Motor-Complete motor 105-125 volts, 60 cycle (M1) Motor-Complete motor 105-125 volts, 50 cycle (M1

24、) Mounting-Motor cradle mounting hardware and retainer PICKUP ASSEMBLIES Arm-Pickup arm-top shell only Base-Pivot arm and base assembly Crystal-Pickup crystal cartridge complete SPEAKER ASSEMBLIES (RL -78-6) Cap-Cone center dust cap Coil-Hum neutralizing coil (L6) Coil-Speaker field coil (L8) Cone-S

25、peaker cone and voice coil (L7) Transformer-Output transformer (T2) MISCELLANEOUS ASSEMBLIES Button-Push button complete Cover-Protective cover for push button markers Cup-Needle cup Dial-Glass dial scale Escutcheon-Glass dial escutcheon less scale and push buttons Escutcheon-Motor switch escutcheon

26、 Hinge-Lid hinge Knob-Tuning, volume control and power switch knob Knob-Tone control knob (white dot) Marker-Push button markers Mounting-Motor mounting hardware Plug -2 prong male plug for motor leads Plug -2 conductor pin plug for phonograph input Spring-Push button and knob retaining spring Support-Lid support Switch-Phono motor switch (S4) Turntable-Turntable complete with rubber tire and spindle