RCA-Victor-Co-Inc-RC-404A 电路原理图.pdf

《RCA-Victor-Co-Inc-RC-404A 电路原理图.pdf》由会员分享，可在线阅读，更多相关《RCA-Victor-Co-Inc-RC-404A 电路原理图.pdf（3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 215-C MODEL U-8 Five -Tube, Electrical Specifications Chassis No. RC -404A Single -Band, A -C, Superheterodyne Victrola FREQUENCY RANGE 540-1,720 kc INTERMEDIATE FREQUENCY 455 kc TUBE COMPLEMENT (1) RCA -I 2 SA7 1st -Detector -Oscillator (2) RCA-12SK7 I -F Amplifier (3)

2、RCA-12SQ7 2nd -Detector, 1st A -F, and A.V.C. (4) RCA-35L6GT Power Output (5) RCA-35Z5GT Half -Wave Rectifier Dial Lamp (1) Mazda 51, 7.5 volts, 0.2 amp. POWER SUPPLY RATINGS A-5 105-125 volts, 50 cycles, 40 watts A-6 105-125 volts, 60 cycles, 40 watts POWER OUTPUT (125 Volt, 60 cycle supply) Undist

3、orted 75 watts Maximum 1.3 watts LOUDSPEAKER Type 5 -inch Electrodynamic Voice -Coil Impedance 3.4 ohms at 400 cycles PHONOGRAPH Synchronous (manual starting) Records 10 -inch and 12 -inch, 78 r.p.m. Pickup Crystal, 100,000 ohms at 1,000 c.p.s. Average Output of Pickup Ils volts at 1,000 c.p.s. acro

4、ss meg. load Replacement Parts Insist on genuine factory -tested parts, which are readily identified and may be purchased from authorized dealers. Model U -8W Walnut Finish Model U -8M Blonde Mahogany Finish Additional Replacement Parts: Stock No. 34758 Bushing -1 rubber, and 1 metal, for pickup arm

5、 34374 Cone-Speaker cone and voice coil STOCK DESCRIPTION STOCK N DESCRIPTION ASSEMBLIES MOTOR ASSEMBLIES 12488 Capacitor -250 mmfd. 31045 Base-Motor support, damper, and bearing cup 12952 Capacitor -300 mmfd. assembly 4838 Capacitor-.005 mfd. 31046 Bearing-Rotor bearing 4937 Capacitor-.01 mfd. 3335

6、3 Cap-Turntable spindle cap (rubber) 33736 Coil-Antenna coil 33357 Coil-Motor field coil -105-120 volts, 25 cycle. 32962 Coil-Oscillator coil 31918 Coil-Motor field coil -105-120 volts, 50 cycle. 13057 Condenser -60 mmfd. 31917 Coil-Motor field coil -105-120 volts, 60 cycle 30433 Condenser -400 mmfd

7、. 31040 Cushion-One set rubber cushion for turntable 30303 Conderser-.0035 mfd. mounting 33584 Condenser-.005 mfd. 31047 Cushion-Rubber cushion for rotor bearing. 4870 Condenser-.025 mfd. 33941 Frame-Motor frame and spindle -60 cycle. Lamination-Rotor lamination -60 cycle 4839 Condenser -0.1 mfd. 33

8、641 12536 Condenser -820 mfd. 33358 Lamination-Stator laminations -25 cycle 32576 Condenser-Electrolytic, one section 20 mfd., one section 12 mfd. 33354 Lamination-Stator laminations-less coil 50 cycle 32968 Condenser -2 -gang variable tuning 33355 Motor -105-120 volta, 25 cycle 32634 Cord-Drive cor

9、d 33351 Motor -105-120 volts, 50 cycle 33289 Dial-Glass dial scale 33940 Motor -105-120 volt, 60 cycle 33297 Drive-Dial drive mechanism-comprising drive 32075 Rang-Lead ring for turntable -25 cycle drum, corn, shaft, dial color plate, back plate and pulleys assembled 33041 Ring-Retaining ring and wa

10、sher for spindle cap 33006 Feet-Rubber feet 33356 Rotor-Rotor frame, laminations, and spindle 33295 Indicator-Dial pointer shaft assembled -25 cycle 32571 Knob-Tan knob (tuning or volume) 33352 Rotor-Rotor frame, laminations, and spindle 11765 Lamp-Dial lamp-Mazda 51 shaft assembled -50 cycle 31193

11、Lead-Antenna lead 31036 Rotor-Turntable and rotor lamination for 60 33292 Plate-Dial color plate cycle operation 33294 Pulley-Drive cord pulley 31042 Stattor-Stator assembly comprising coila and 33558 Resistor -86 ohms laminations for 60 cycle operation 13428 Resistor -150 ohms, watt 32076 Turntable

12、-Finished turntable plate only -25 30538 Resistor -330 ohms, watt cycle 13998 Resistor -22,000 ohms, i watt 31039 Turntable-Finished turntable plate only -50 12266 Resistor -39,000 ohms, * watt cycle 12412 Resistor -47,000 ohms, watt 4083 Washer-Leather Washer 12264 Resistor -220,000 ohms, watt 3334

13、8 Washers-Leather and metal washers for stator 12285 Resistor -470,000 ohms, watt bearing 12679 Resistor -2.2 meg., watt 14231 Washer-Metal spacing washer 13601 Resistor -10 meg., 4. watt 32074 Weight-One upper and one lower weight for 33464 32969 Shaft-Tuning knob shaft and bearing Socket-Dial lamp

14、 socket stator -25 cycle (2 each required) 32537 Socket-Tube socket 32803 Spring-Dial knob spring SPEAKER ASSEMBLIES 31615 Spring-Drive cord tension spring (RL -78-4) 33296 Spring-Drive drum retaining spring 32667 Spring-Knob or drive drum retaining spring. 32907 Cap-Cone dust cap 32966 Transformer-

15、First i -f transformer 33809 Coil-Speaker field coil 32967 Transformer-Second i -f transformer 33465 Transformer-Output transformer 33466 Speaker complete (no output transformer) 33504 Volume control and power switch MISCELLANEOUS ASSEMBLIES PICKUP AND ARM ASSEMBLIES 33467 Control-Tone control and R

16、adio -Record switch 33121 Arm-Pickup arm complete-less crystal car- 33289 Dial-Glass dial scale tridge 30863 Knob-Tone control knob 33592 Base-Pickup arm base and pivot arm 32895 Knob-Tuning or volume control knob 33122 Crystal-Pickup crystal cartridge and needle screw 33530 Mounting-Pickup arm rubb

17、er cushion, washer and nut 33123 Damper-Viscoloid damper for pickup armature. 30870 Plug -2 -prong plug for motor leads 33529 Screw-Pickup needle screw 32610 Rest-Pickup arm rest RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. . 收音机爱 好者资料库 RadioFans.CN PAGE 216-C U-8 w.5-zsc

18、vcus u Motor Coil Assembly and Connections TURNTABLE HELD ON SHAFT BY RETAINING RING AND WASH ER DAMPER ASSEN LV : ROTOR LEATHER WASHER SHOULD BE OIL SOAKED, - GOES ABOVE STEEL WASHER OIL BALL BEARING USE LIGHT OIL AIR GAP IS .016 GAP MUST BE UNIFORM LUBRICATE OUTER AND INNER BEARING SURFACE WITH LI

19、GHT OIL Cross Section of Motor Assembly Phonograph Service Data The motor is started by turning the radio -phono tone control to either 3rd or 4th position clockwise and giving the turntable a clock- wise spin with the hand. Smooth starting and running will be insured by keeping the bearings well cl

20、eaned and oiled. Hum and Vibration.-A small amount of hum when starting, decreasing to a negligible amount when running, is normal. If ex- cessive vibration occurs it may he due to: I. Insufficient lubrication, or any failure that will cause binding. 2. Leather washer not oiled. (Check to make certa

21、in that the leather washer is above the steel washer.) 3. Motor not properly supported from motor board. 4. Burrs on poles of rotor or stator. Remove with fine emery cloth. 400 ANT. COIL ol o SS Piff 355.607 SSI 110. PET. add additional steel washers beneath the stator if necessary. Lubrication.-Oil

22、ing points are indicated in the diagram. I. F. 21.ADET.,1sTA.F. &A.V.C. 12SK7 ,O a 3 A ,rT TONE v FULLM ONEW yOA ELLOW P/ AL YO NE i M TONE +/TONE Radie -Photo -rote CWI,ol 12SQ7 2Ne I.F.TRANS. 455 K C 45V. GREEN 1:1 r1- REO alA Ir I 3O ntv NDICATES I M CHASSIS VOLUME CONTROL 1 1.0035 250000 250 005

23、 .01 RECT. 35 25G INDICATES COMMON WIRING -INSULATED FROM CHASSIS PILL LAMP POWER LORD TR966af4t 150 F OUTPUT 35 L6 GT 5 FRONT VIEW RADIO- PHONO- TONE SWITCH NA. I RADIO POSITION) SPEAKERFIELD _J (57)0-N-BLUE 400 +- S 12 , II 35e5G1 3336GT115N3 25A3 12503 SWITCH ON VOL. CONTROL 820 N 35000 005 T C SWITCH ON RADIO- PMONO. Schematic Circuit Diagram 收音机爱 好者资料库 RadioFans.CN