RCA-Victor-Co-Inc-12QK 电路原理图.pdf

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1、PAGE 211-C PSU 8A, 8B, 8C, 10A, 10B and 10C A -C Power Supply Units General Description Certain models of the Q Line of RCA Victor Magic Brain 1938 radio receivers are designed for use with a sepa- rate plug-in power supply unit. Different units are available to permit operation on a -c power suppli

2、es of various voltages and cycles, and also on 110 or 220 volts d -c. Service data and diagrams for the a -c units are contained in this sheet: The d -c units are described in a separate sheet. Each a -c unit is equipped with an 18 -inch 6 -wire cable with a 7 -contact female receptacle which plugs

3、into a 7 -prong male connector on the receiver chassis. The a -c power cord is 6 feet long. The units are approximately 71/2 inches long, 41/4 inches wide, and 6 inches high. Testing.-To check an a -c power unit when a receiver is not available, connect a 50 -watt resistor (4,800 ohms for PSU 8A, 8B

4、, 8C, and 3,450 ohms for PSU 10A, 10B and 10C) across contacts 2 and 6 on the power receptacle. Connect a jumper across contacts 4 and 5. Measure the d -c voltage across the resistor, which should be approximately 375 volts, with 117 volts supply on the 117 -volt tap. Specifications TyPeRadiotron Ra

5、ting g Rectifier D -C Output Heater (A -C) Used with Models D -C Resis., Ti Net Weight (pounds) Voltage Cycles Pri. ohms Total Sec. ohms Total PSU SA 105-125 50/60 5Y3 -G 375 volts at 78 milliamps 6.45 V 3 amps 8Q1 and 8Q4 6.4 535 7 PSU 8B 105-125 25/60 8.3 705 9 PSU 8C .Universal* 50/60 17.4 455 11

6、 PSU l0A 105-125 50/60 5U4 -G 380 volts at 110 milliamps 6.36 V 5 amps lOQl, 12Q 12Q4, 12Q U* 3.0 250 9 PSU 10B 105-125 25/60 3.9 250 13 PSU lOC Universal* 50/60 8.9 190 15 * The universal can be set for 105-117, 117-130, 140-160, 200-225, or 225-250 volt supply. * Model 12QU has a phonograph motor

7、designed for 50/60 cycle operation only, and uses either PSU 10A, or IOC. REPLACEMENT PARTS Insist on genuine factory -tested parts, which are readily identified and may be purchased from authorized dealers. STIOoCK DESCRIPTION STOCK DESCRIPTION 11203 14531 14409 51251 31733 31736 Cable -8 -conducto

8、r power output cable with plug Capacitor -10 mfd. (Cl) (PSU 8A, 8B or 8C only) Capacitor -25 mfd. (C1) (PSU 10A, 10B or lOC only) Plug -7 -contact plug for power output cable Socket-Rectifier tube socket Transformer-Power transformer 105-125 volts, 50-60 cycle (T1) (PSU SA only) Transformer-Power tr

9、ansformer 105-125 volts, 50-60 cycle (T1) (PSU l0A only) 31734 31737 31735 31738 Transformer-Power transformer 105-125 volts, 25-80 cycle (T1) (PSU 8B only) Transformer-Power transformer 105-125 volts, 25-60 cycle (T1) (PSU 10B only) Transformer-Power transformer 105-130, 140- 180, 200-250 volts, 50

10、-60 cycle (Ti) (PSU 8C only) Transformer-Power transformer, 105-130, 140- 160, 200-250 volts, 50-60 cycle (T1) (PSU 10C only) 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 2i2-C PSU 8A, -B, -C, IO A, -B, -C T 1 Ct p W W I Cr A. C.SUPPLY PLUG

11、 GREEN GREEN RECTIFIER TUBE 5Y3 -G IN PSU 8A 6 BB 5U4 -G IN PSU 10A but with low line voltage, it may be necessary to turn the plug to OLD after a time corresponding to a small fraction of the total life of the vibrator. Testing.-The simplest way to check PSU 8E or 10E is to plug it into a receiver

12、for which it is designed. (First check the position of the links tor the particular line voltage.) Note whether the dial lamps in the receiver light with normal brilliancy, and measure the rectified B voltage at the receiver to determine whether it is normal. If a receiver is not available, dummy lo

13、ads may be connected to the unit as specified in the table below. The supply current must be measured with a d -c ammeter, not a meter of the ac -dc type, inasmuch as the r.m.s. value of the cur- rent is considerably higher than the d -c current. The heater voltage must be measured with an r.m.s. me

14、ter (thermo-coupled), not with an average meter (rectifier type), on account of the square wave shape. It an accurate thermo-coupled meter is not available, the heater voltage may be checked by observing the brilliancy of the dial lamps in the receiver. They will glow dull or red if the heater volta

15、ge is low. Precautionary Lead Dress. - (1) Dress all leads on the power transformer primary and the buffer capacitors away from the line chokes. (2) Leads to C19 must be as short as possible. (3) The rectifier filament leads should be run close to each other, and dressed away from the filter chokes.

16、 (4) D -C power cord must not touch power transformer. (5) Keep antenna and ground leads away from PSU and PSU cables. PSU Supply Volts DC Heater Load (ohms) Rectifier Load (ohms) Supply Current D -C amps. Heater Voltage (A.C.) Rectified Voltage (D.C.) Used With Models Max. Min. Max. Min. 8E 117 2.2

17、 4,900 0.90 7.85 7.1 400 360 8Q1, and 8Q4 234 2.2 4,900 0.50 7.85 7.1 400 360 10E 117 1.4 3,400 1.10 7.4 6.6 400 360 10Q1, 12Q4, 12QK 234 1.4 3,400 .85 7.4 6.6 400 360 NOTE: The heater and rectifier dummy load resistors should be capable of handling 50 watts. Connect the heater load across terminals

18、 1 and 7 on the 7 -contact plug. Connect the rectifier load resistor across terminals 2 and 6 on the 7 -contact plug. Connect a jumper from terminal 2 to 3, and from 4 to 5 on this plug. Check position of links before turning power on. Replacement Parts Insist on genuine factory -tested parti, which

19、 me readily identiRed and may be purchased born euthorired dealers. STCoK DESCRIPTION S TOC No K DESCRIPTION DC .POWER SUPPLY 32053 Coil-Choke coil (L8) (PSU -8E and PSU -10E) 5140 Fuse -5 amp, fuse 30557 Plug-Fused plug less fuses and power cord 12952 Capacitor -330 mmfd. (C19) 32052 Plug -6 -conta

20、ct power change plug 4937 Capac tor-.01 mfd. (C9, C10) 14409 Plug -7 -contact female plug for power supply 14626 Capacitor-.07 mfd. (C13, C14, C17) cable 4839 Capacitor -0.1 mfd. (C8) 32064 Resistor -0.47 ohms, flexible type (RS, R4). 12484 Capacitor -0.25 mfd. (C1, C2, CS, C4, C5, C6) 4687 Resistor

21、 -1,000 ohms, 4 watt (Rl) 32049 Capacitor-Comprising two sections of 0.5 mfd. 11768 Resistor -4,700 ohms, 2 watt (R2) each (Cil, C12) 32051 Socket -6 -contact power change socket 32048 Capacitor -5 mfd. (C7) 31251 Socket-Tube socket 32047 Capacitor -Comprising one section 10 mfd. and 14312 Socket-Vi

22、brator socket one section 20 mfd. (C15, C18) 32062 Transformer-Power transformer (PSU -8E only) 32045 Capacitor -15 mfd. (C16) 32083 Transformer-P owe r transformer (PSU -10E 32048 Coil-Choke coil (L1, L2, L3, L4, L5, L8) only) 31794 Coll-Choke coil (L7) 32050 Vibrator RCA VICTOR DIVISION OF RADIO C

23、ORPORATION OF AMERICA, a CAMDEN N. J., U. S. A. 收音机爱 好者资料库 RadioFans.CN PAGE 21.4-C PSU 8E VOg n N O .,52 Rn Q I I- . h U J ,J I- g d = .a- 111. a w J arl nn = Z _ N S p N ZO LL 93WZ Z N m U T p(N N/LL J FJ x du F = :8 _f moe oza r HII N O I -= 0 r u u000o01 a J W d Ca W O t P 61 / 111_u O_ LLZJ 000

24、 II / o LL j aac 100 LL 2.:4: I _ F u_ I Z C p-I O ilil II. O P ! K n ,.,._ , LL s u -F A 0e - _ m . N II I o -4 *II, 111 % 0 _ , ; a u- + O 7S N o wr N ,.rjNLL uoF F- w OJ F N oo II1 1 F LA N L G o CC -1-N D g PAGE 31_7-C 12Q11, 12QK, I2QU F V o I eei unF 3 000 ca I f i N zg xn N LL 3 0001 T1117:7;

25、 n onl N d4 T J ,nF il-11t U U Hi o Q CN01173n0) naM1 ,UIP 1/I. rc VO00 sa 00 o OLL I_U N2 - ti- 11 S.0 m N UNf u. O Jn 111 2e e Wo O LLm F ec- rF 11, sn uR T F 000 001 5121 H11 9121 do W 0 21 ,17f1 4 a u000 09s V0o0!Y la Z121 eF -I- tr000oo1 y121 000 -UI d / J f J N A 77 d -21fONn fr-III 6p yo m e,

26、J IP G21 u X 4o0oCC za 5. 318-C 1294, 12QK, 12QU oonnU cm el m.nam ii1LLLD 0tnlp,ul0 83= o Precautionary Lead Dress. - 1. The following leads should be dressed away from other parts and chassis: a. All leads to the bottom of the tuning gang. b. All capacitor leads to oscil lator section of range swi

27、tch. c. Yellow lead from lug No. 10 on S4 to dummy lug on A oscillator coil. a u N N_ m= rNM089C. I ua 2_O z m QZ Z LS D e. Yellow a n d green from X detector (should be dressed away from each other as well as other parts). 2. Dress all leads away from phono jack and C49. O n ;. l o ry ;ti o x= U i

28、O (7) y Nd o r EZD d. Yellow lead from pin No. 8 on 6J7 oscillator socket to terminal board. leads 4. coil 14 -1 3. Twisted leads of B oscillator coil must be soldered together within 1/4inch of coil tube. The brown, black, and blue leads in back of the oscillator coils should be dressed away from c

29、oil windings. R13 and C41 must be dressed away from pin No. 7 of 6J5 (tube No. 7). M O0 F PAGE 319-C REPLACEMENT PARTS t2Q11, 12QK, Insist on genuine factory -tested parts, which are readily identified and may be purchased from authorized dealers. I2QU STOCK DESCRIPTION STOCK DESCRIPTION ASSEMBLIES

30、0132 14560 Resistor -47,000 ohms, 1/10 watt (R12) Resistor -100,000 ohms, watt (R7, R14, R15, 31815 Board -Antenna and ground terminal board- R18, R19, R34) Models 12Q4 and 12QK only 12264 Resistor -220,000 ohms, watt (R26, R30). 31929 Board -Antenna and ground terminal board- 12199 Resistor -270,00

31、0 ohms, watt (R31, R41) - Model 12QU only R41 in Model 12QU only 31276 Bracket -Band indicator bracket complete less 11453 Resistor -270,000 ohms, 1/10 watt (R16, R17) indicator strip, spring, and cord 12486 Resistor -560,000 ohms, watt (R13) 4.4. 31282 Bracket -Magic Eye mounting bracket and clip C

32、able drive 30963 Resistor -820,000 ohms, watt (1142) -Model 31281 12QU only. -Indicator pointer cable Cap -Rubber cap for Magic Eye 30766 12013 Resistor -1 meg., 1/10 watt (R32, R33) 12607 Cap -Top shield cap for i -f transformers 13730 Resistor -1 meg., watt (R1, R4) 12807 Capacitor -Trimmer 2-8 mm

33、fd. (C70) 30208 Resistor -1.2 meg., watt (R40) -Mode 1 12714 Capacitor -Trimmer 2-12 mmfd. (C29, C31) 12QU only 12884 Capacitor -Trimmer 2-20 mmfd. (C4, C6, C8, 12679 Resistor -2.2 meg., 4 watt (R20) C12, C15, C18, C19) 14887 Retainer -Pulley retainer 14392 Capacitor -4.7 mmfd. (C26, C41) 4669 Screw

34、 -No. 8-32 sq. hd. set screw for drum, 31709 Capacitor -10 mmfd. (C69) Stock No. 31273, and pulley, Stock No. 13200 Capacitor -10 mmfd. (C16, C17) 31272 and Stock No. 31788 13002 Capacitor -12 mmfd. (C1, C2) 14404 Socket -7 -contact male socket for power input. 31354 Capacitor -33 mmfd. (C22) 31364

35、Socket -Dial lamp socket 13545 Capacitor -39 mmfd. (C80) -Model 12QU only 14278 Socket -Phonograph input socket 31822 Capacitor -43 mmfd. (C20) 13871 Socket -Magic Eye socket 31349 Capacitor -62 mmfd. (C14) 31251 Socket -Tube socket 13057 Capacitor -68 mmfd. (C28) 31279 Spring -Band indicator tensio

36、n spring 31270 Capacitor -100 mmfd. (C50, C51) 31418 Spring -Drum drive cord tension spring 12720 Capacitor -100 mmfd. (C33, C52) 13638 Spring -Indicator pointer drive cable tension 31706 Capacitor -120 mmfd. (C11) spring 12724 Capacitor -120 mmfd. (C24) 31849 Switch -Fidelity switch - Models 12Q4 a

37、 n d 31908 Capacitor -155 mmfd. (C21) 12QK only (S7, S8) 13003 Capacitor -180 mmfd. (C27) 31961 Switch -Fidelity switch (S20, S21, S22, S23) 31756 Capacitor -330 mmfd. (C35, C36, C46, C47). -Model 12QU only 12952 Capacitor -330 mmfd. (C3, C25, C84) 31844 Switch -Range switch -less coils (S1, S2, S3,

38、 30608 Capacitor -510 mmfd. (C10) S4, S5, S6) 12537 Capacitor -560 mmfd. (C30, C86) 30953 Switch-S.P.S.T. sensitivity switch (S10) 3170.3 Capacitor -2,500 mmfd. (C9) 31850 Tone and pwer switch (S9, S11) 31704 Capacitor -8,000 mmfd. (C7) 31746 Transformer -First i -f transformer (L23, L24, 5107 Capac

39、itor -.0025 mid. (C65) L25, C35, C36) 4838 Capacitor -.005 mid. (C53, C67, C81, C82- C81, C82 in Model 12QU only) 31749 Transformer -Second i -f transformer (L28, L29, L30., C46, C47) 5148 Capacitor -.007 mid. (C59) -Models 12Q4 and 12QK only 31268 Transformer -Third i -f transformer (L31, L32, C50,

40、 C51) 14393 Capacitor -.01 mid. (C23, C34, C42, C44, 31847 Transformer -Output transformer (Ti) C45, C49) 31848 Volume control (R29) 11315 Capacitor -.015 mfd. (C62) 30938 Capacitor -.025 mid. (C39, C54, C61) SPEAKER ASSEMBLIES 4886 Capacitor -.05 mfd. (C37, C38) 4839 Capacitor -0.1 mfd. (C40, C43,

41、C48) (Speaker RL70H-3) 12484 Capacitor -0.25 mfd. (C57, C58, C60, C63, C68) 31825 Cap -Speaker cone center dust cap 5212 31845 31257 Capacitor -16 mfd. (C55, C56) P Coil -A band antenna coil (L Le) Coil -A band oscillator coil (L12) 11469 11234 31275 Coil -Hum neutralizing coil (L34) Coil -Speaker f

42、ield col (L33) Cone -Speaker cone and voice coil (L35) 31891 Coil -A and X bands r -f coil (L20, L21, 31830 Plug -4 -contact male plug for speaker L22) 31853 Speaker complete 14949 Coil -B band antenna coil (L5, L6) 31890 Coil -B and 49 -meter bands oscillator coil MISCELLANEOUS ASSEMBLIES (L18) 149

43、52 Coil -B band r -f coil (L27) 13103 Cap -Pilot lamp cap (bullseye)-Model 12QU 14950 31255 Coil -C band antenna coil (L3, L4) Coil -C or 31 -meter band oscillator coil (Lll, L17) 31541 only Cushion -Motor plate mounting cushion and 14953 Coil -C band r -f coil (L26) clamp assembly (sufficient for o

44、ne instrument - 31892 Coil -X band antenna coil (L9, L10) Model 12QU only 31812 Coil -X band oscillator coil (L1S) 31962 Dial -Dial scale and crystal- Model 12QU 31852 Coil -19 -meter band oscillator coil (L15, L16). only 31254 Coil band 31855 Dial -Dial scale and crystal -Models 12Q4 and -25 -meter

45、 oscillator coil (L14) Coil -49, 31, 25, and 19 -meter bands antenna 14951 12QK only coil (L1, L2) 31921 Escutcheon -Dial escutcheon less dial scale and 31846 Coil -49, 31, 25, and 19 -meter bands r -f coil crystal -Model 12QU only (L19) - 31854 Escutcheon -Dial escutcheon less dial scale and 31843

46、Condenser -3 -gang variable tuning condenser crystal -Models 12Q4 and 12QK only (C5, C13, C32) 30698 Hinge -Cabinet lid hinge -Model 12QU only. 31278 Cord -Band indicator drive cord 31564 Holder -Needle card holder -Model 12QU only 31927 Cord -Variable condenser drum drive cord 31717 Indicator -Dial

47、 indicator pointer, carriage, and 31787 Drive -Two -speed drive and mounting bracket clip assembly -Model 12QU only 31273 Drum -Variable condenser drive drum 31714 Indicator -Dial indicator pointer -Models 12Q4 31928 Indicator -Band indicator strip and 12QK only 11891 Lamp -Dial lamp 31355 Knob volu

48、me control, tone 31480 Lamp -Dial lamp (center) -Station selector, control, range switch, or fidelity switch knob 14028 Nut -Jamb nut for capacitor, Stock Nos. 12714, -Model 12QU only 12884, and 12O7 31802 Knob -Station selector, volume control, tone 31817 Plate -Cushion sbcket mounting p 1 a t e - less socket control,