RCA-Victor-Co-Inc-U-112 电路原理图.pdf

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1、Model U-111 LEATHER WASHER SHOULD SE OIL SOAKED, GOES ABOVE STEEL WASHER. OIL BALL BEARING USE LIGHT OIL MODELS U-111, and Chassis No. RC -341 RC -341 M PAGE 677-C U-112 RC -341 C RC -341 CM Five -Tube, Single -Band, A -C, Victrolas TURNTABLE HELD ON SHAFT BV RETAINING RING A WASHER Motor Details f

2、AIR GAP IS .OIS D.00075 - GAP MUST BE UNIFORM. OIL OUTER BEARING SURFAGE,USE LIGHT OIL OIL INNER SEARING SURFACE., USE LIGHT OIL. Electrical Specifications Frequency Range 540.1,720 kc R -F Alignment Frequency 1,500 kc (osc., ant.) Intermediate Frequency 455 kc RADIOTRON COMPLEMENT (1) RCA -6A8 Firs

3、t Det., and Osc. (2) RCA -6K7 Intermediate Amp. (3) RCA -6Q7 -G Second Det., A -F, and A.V.C. (4) RCA -6K6 -G Power Output (5) RCA -5Y3 -G Rectifier Dial Lamp Mazda No. 44, 6.3 volts, 0.25 amps. POWER OUTPUT (125 -volt, a -c supply) Undistorted 2.0 watts Maximum 3.5 watts Model U-112 RC -341 Lou OS

4、P EA K ER Type 5 -inch electrodynamic V -C impedance 5 ohms at 400 cycles POWER SUPPLY RATINGS Rating A-6 105-125 volts, 60 cycles. 80 watts Rating A-5 105-125 volts, 50 cycles, 80 watts PHONOGRAPH Synchronous (manual starting) Records 10 -inch and 12-inch,.78 r.p.m. Pickup Crystal, 80,000 ohms at 1

5、,000 c.p.s. Average Output of Pickup 11/2 -volts, at 1,000 c.p.s. -across 1/4 meg. load MODELS U-112 AND LATE U-111 Model U-112 is a five -tube superheterodyne table -type Victrola similar to Model U-111, except that the cabinet is enlarged to per- mit playing 12 -inch records with the lid closed. T

6、he cabinet dimen- sions are-Height 11 inches, Width 15 inches, Depth 13i inches. The shipping weight is approximately 21 pounds. The service data for Model U-111 applies to Model U-112, with the following exceptions: 1. The rectifier tube is RCA -5W4 in U-112. 2. A 12,000 ohm resistor (R13) is added

7、 in series with C22 across the pickup in Model U-112. 3. Model U-112 is made in three power supply ratings: Rating A-6 105.1.5 volts, 60 cycles, 80 watts Rating A-5 105-125 volts, 50 cycles, 80 watts Rating B-2 105-125 volts, 25 cycles, 80 watts 4. The 25 cycle power transformer for U-112 has the fo

8、llowing d -c resistance: Primary 13.7 ohms High -voltage secondary 1,190 ohms BOTTOM VIEW i I OF STATOR RAIL vE_LLOW a YELLOW IIOVOLTS- SOcrcuLe HoVOLEs- SO CYCLE! IIO VOLTS-2BCVCLES 5N -T95 D -C Resistance of each coil is as follows: 110 volts, 50 cycles, and 60 cycles 82 ohms 110 volts, 25 cycles

9、250 ohms 5. The speaker in Model U-112 is marked 84265-4 and has the following d -c resistances: Field coil 1,300 jhms Primary of output transformer 420 ohms Voice coil 2 ohms Later production of both the U-111 (.RC -341M) and U-112 (RC-341CM) incorporate the following changes: 1. The antenna coil i

10、s changed from Stock No. 30894 (1 ohm primary) to No. 32338. (85 ohm primary). No. 32338 may be used to replace No. 30894. 2. A 270 mmf. capacitor (C23) is connected from the triode plate of the 6Q7-G to chassis. The alignment procedure for Model U-112 is the same as for U-111. The following additio

11、nal alignment data applies to both models: On r -f alignment, turn the gang condenser to minimum (all the way out of mesh), and with the test -oscillator tuned to 1,720 kc, align the oscillator trimmer C18. Adjust the test -oscillator to 1,500 kc, tune the receiver to the 1,500 kc signal, and align

12、the antenna trimmer C3 for maximum output. Hum and Vibration.-A small amount of hum when start- ing, decreasing to a negligible amount when running, is normal. If excessive vibration occurs it may be due to: 1. Insufficient lubrication, or any failure that will cause binding. 2. Leather washer not o

13、iled. (Check to make certain that the leather washer is above the steel washer.) Precautionary Lead Dress 1. Dress power leads to phono motor switch away from the audio wiring. 2. Dress power cord and motor cable to end of chassis (free trom volume control wiring). 3. Dress pilot lamp lead away from

14、 6Q7G grid. 4. Capacitors C13 and C15 (located at volume control) must be dressed at right angles to each other and as far apart as possible. 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 678-C U -I11 U-112 Alignment Cathode-ray Alignment is

15、 the preferable method. Output meter alignment.-If this method is used, connect the meter across the voice coil, and turn the 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 a

16、s low as possible to avoid a -v -c action. Steps Connect theh est -o side of test -oscillator to- Tune test-osc. to- Turn radio dial to- Adjust the following for max. peak output No. 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 Transformer) N

17、o. 2 6A8 1st-det. grid cap, in series with .01 mfd. 455 kc L5 and L6 (1st I -F Transformer) No. 3 Antenna lead, in series with 200 mmfd. 1,500 kc 1,500 kc C18* (osc.) C3 (antenna) * Tr.mmer C17 on gang condenser should be screwed clockwise for maximum capacity before adjusting C18. T,6A8 C4 6K7 I.F

18、L - 4 C C2 s 11-400 MME i I12V. L T =C3 I 3 -IS 4u MMF. 1 0.1 MFD. ANT. COIL BLACK TO L3 GND. 1 2.5A OSC. COIL c -A - BLACK -RED -BLACK - BROWN -BROWN -BLACK CABLE PLUG BLACK C5 56 MME. 4TO R7 n /R1 230 n .14 1ST I.F. = TRANSF. e5or. R2 56,000 ADJUST FOR MAX. CAPACITY Rit 22,000, SPEAKER CONNECTIONS

19、 SPEAKER PLUG T2VOICE COI L GREEN .LINK 9 8 BROWN- FIELD HUM NEUT.COIL L10 Procedure Pre-setting dial.-With gang condenser in full mesh, move dial pointer to coincide with horizontal lines. This is a friction adjustment. For additional details, refer to booklet RCA Victor Receiver Alignment. 6Q7 -G

20、12D.DET A.F- 1 watt (R9) 30546 Resistor -470 ohms, watt (R1, R7) 31106 Resistor -10,000 ohms, wire wound, 3 watt (R3) 30736 Resistor -22,000 ohms, 1 watt (R12) 12286 Resistor -56,000 ohms, watt (R2) 12199 Resistor -270,000 ohms, watt (R10) 12285 Resistor -470,000 ohms, watt (R11) 12679 Resists -2.2

21、meg., watt (R4, R6) 30868 Socket -2 -contact female socket for motor power cable 5040 Socket -4 -contact female socket for speaker cable 31364 Socket-Dial lamp socket assembly 11196 Socket-Radiotron socket 30631 Spring-Indicator drive cord tension spring 4284 Spring-Pickup cable connector spring 310

22、96 Swtch-Radio-record switch (51, S3) 30902 Transformer-First i -f transformer (L5, LS, C6, C7) . 30903 Transformer-Second i -f transformer (L7, L8, C9, C10) 30891 Volume Control and power switch (R5, S2) 4285 Washer-Pickup cable connector insulating washer 31045 31046 31041 31047 31034 9841 31040 3

23、1037 31036 31043 31042 31039 4083 14231 MOTOR ASSEMBLIES Base-Motor support, damper, and bearing cup assembly Bearing-Bearing assembly Cap-Rubber spindle cap Cushion-Rubber cushion for bearing Motor -110 volt, 50 cycle-less mounting (M1) Motor -110 volt, 60 cycle-complete with mount- ing (M1) Mounti

24、ngs-Turntable top rubber mountings sufficient for one turntable Rotor-Turntable and rotor lamination assembly complete for 50 cycle operation Rotor-Turntable and rotor lamination assembly - complete for 60 cycle operation Stator-Stator assembly complete with coils and laminations for 50 cycle operat

25、ion Stator-Stator assembly comprising coils and laminations for 60 cycle operation Turntable-Finished turntable top plate only- less rubber mountings (50-60 cycle only). Washer-Leather washer Washer-Metal spacing washer 31049 4286 4288 31050 9842 12539 31110 5039 31109 31111 30901 6113 13085 30863 3

26、1053 31054 30870 31079 30900 31164 12488 32338 30128 30888 31445 32077 32073 32072 32076 32074 32075 32503 32504 5039 PICKUP AND ARM ASSEMBLIES Base-Pickup arm pivot shaft and base assembly Bushing-Bushing and ferrule insert for con- nector cap Cap-Pickup cable connector cap Crystal-Pickup crystal a

27、nd needle screw Pickup Crystal and arm complete with mount- ing-less connector Screw-Pickup needle screw REPRODUCER ASSEMBLIES (Speaker 84265-1) Cone-Reproducer cone and voice coil (L9) Plug -4 -prong male plug for reproducer Reproducer complete Transformer-Output transformer (T2) MISCELLANEOUS ASSE

28、MBLIES Crystal-Station selector dial crystal Foot -Felt foot for cabinet Hinge -Cabinet lid hinge Knob-Station selector, volume control or radio - record switch knob Mounting-Motor mounting screw assembly com- plete Mounting-Pickup arm mounting nuts, washer and rubber spacer Plug-2contact male plug

29、for motor leads Screw-Chassis mounting screw and washer. Spring-Retaining spring for knob Stock No 30863 Support-Cabinet lid support MODEL U-112 LATE U-111 CHASSIS ASSEMBLIES Capacitor -270 mmfd. (C23) (Late U-111 and late U-112) Coil-Antenna coil (L1 and L2) (Late U-111 and late U-112) Resistor -12

30、,000 ohms, watt (R13) (U-112 only) Transformer-Power transformer, 105-125, 200- 250 volts, 50-60 cycles Transformer-Power transformer, 105-125 volts, 25-60 cycles (U-112) 25 -CYCLE MOTOR ASSEMBLIES (U-112) Motor -110 volts, 26 cycles, less mounting Rotor-Turntable and rotor laminations, com- plete f

31、or 25 -cycle motor Stator-Stator, stator coils, laminations, and weights for 110 -volt, 25 -cycle motor Turntable-Finished turntable top plate for 25 - cycle rotor. Weights-One upper and one lower weight for 25 -cycle stator (2 of each required) Weight-Lead ring for 25 -cycle rotor SPEAKER ASSEMBLIE

32、S (U-112) (Speaker 84265-4) Cone-Cone for speaker marked 84265-4 Transformer-Output transformer for speaker marked 84285-4 Plug -4 -prong male plug for reproducer For complete speaker, order Stock No. 31109 (84265-1), Replacement Parts fdr Stock No. 31109 are listed in Service Data for U-111. See U-111 Service Data for all Re- placement Parts not listed here. 收音机爱 好者资料库 RadioFans.CN