RCA-Victor-Co-Inc-812K 电路原理图.pdf

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1、PAGE 595-B MODEL 812K Twelve -Tube, Three -Band, A -C, Superheterodyne Receiver Radiotron Cathode Current Readings Measured with Milliammeter Cornected at Tube Cathode Terminals Under Conditions Similar Those of Voltage Measurements (1) RCA-6K7-R-F Amp. 5.0 ma. (2) RCA -6L7 -1st Det. 6.0 ma. (3) RCA

2、-6J7-Osc. 8.5 ma. 1.2 ma. 6.0 ma. (4) RCA-6J7-Osc. Control (5) RCA -6K7 -1st I -F Amp (6) RCA -6K7 -2nd I -F Amp. 7.5 ma. (7) RCA -6H6 -2nd Det., A.V.C. arid A.F.C. - ma. (8) RCA-6N7-Phase Inverter 1.8 ma. (9) RCA-6F6-Output26 ma. (10) RCA-6F6-Output 26ma. (11) RCA-5T4-Rectifier118 ma.* (12) RCA-605

3、-Tuning Tube. 2.5 ma. (*Cannot be measured at socket) Socket to Model 812K Electrical Specifications FREQUENCY RANGES Broadcast (A) Medium Wave (B) Short Wave (C) Intermediate Frequency RADIOTRON COMPLEMENT 530.1,720 kc 2,100.6,800 kc 6,800.21,500 kc R -F ALIGNMENT FREQUENCIES Short Wave (C) 20,000

4、kc (osc., det., ant.) Medium Wave (B) 6,000 kc (osc.) Broadcast .(A).600 kc (osc.), 1,500 kc (osc.) 460 kc (1) RCA -6K7 (2) RCA -6L7 R -F Amplifier First Detector (7) RCA -6H6 (8) RCA -6N7 Second Detector, A.V.C., and A.F.C. Audio Phase Inverter (3) RCA -6J7Heterodyne Oscillator (9) RCA -6F6Power Ou

5、tput (4) RCA -6J7Oscillator Control (10) RCA -6F6Power Output (5) RCA -6K7 First I -F Amplifier(11) RCA -5T4 Full -Wave Rectifier (6) RCA -6K7Second I -F Amplifier (12) RCA -6G5Magic Eye Tuning Tube Pilot Lamps (7) Mazda No. 46, 6.3 volts, 0.25 amp. POWER SUPPLY RATINGS Rating A 105.125 volts,50.60

6、cycles, 145 watts Rating B 105.125 volts,25 cycles, 145 watts Rating C 105.125/140-160/195-250 volts, 50.60 cycles, 145 watts POWER OUTPUT LOUDSPEAKER Undistorted10 wattsType 12 -inch Electrodynamic Maximum121/2 WattsImpedance (v.c.) 111/2 ohms at 400 cycles Precautionary Lead Dress.-(1) Bus lead fr

7、om oscillator coil directly to ground must be as short as possible for cor- rect alignment, (2) bus lead from range switch S3 to oscilla- tor section C53 of variable condenser should be 11/2 inches long for correct alignment, (3) bus lead from detector coil to range switch S4 must be as short as pos

8、sible for correct alignment, (4) bus lead from detector coil to detector section C7 of variable condenser should be 21/2 inches long for cor- rect alignment,(5)detector trimming capacitor C8 lead should connect directly to variable condenser C7, (6) bus lead from antenna section of range switch S2 t

9、ochassis ground lance must be as short as possible, (7) bus lead from antenna coil to range switch S2 should be 21/4 inches for correct alignment, (8) bus lead from antenna coil Ito antenna section Cl of variable condenser must be VA inches over-all with 1/2 inch bend at coil end for correct alignme

10、nt, (9) fila- ment leads should be dressed away from RCA -6N7 grids, pins Nos. 4 and 5, to reduce hum pickup, (10) reslistors R41, aR44 in the oscillator control tube circuit must be kept free of other component parts for satisfactory operation of the a -f -c circuit, (11) capacitor C29 and resistor

11、 R16 leads from terminal board to the phonograph terminal board should be as short as possible and dressed away from other parts to reduce hum pickup, (12) filament leads should all be twisted to reduce hum pickup, (13) filament leads should be dressed away from the terminal board near the 4th i-f t

12、ransformer. (14) Lead from the range switch S3 to the oscillator cathode socket terminal should be dressed under bus wire on socket to hold this lead down close to chassis. REFER TO INDEX FOR ADDITIONAL DATA PER- TAINING TO ELECTRIC TUNING. RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN

13、 NLUS A 收音机爱 好者资料库 RadioFans.CN A G C3 - R. F. 330 M MENII- .17.- 6257 .1.- 4 C2 o IINE,i 2-20 ( =- =- CIi 1-490MMF. , .= 5RI S2 5560,000 _!.=._ A. MOVABLE SEGMENTS .-(ROTOR THISMI SWITCH PROGRESSES 4K-, DIRECTION, RANGE SELECTOR SHOWN IN A SAND POSITION, ROTATE KNOB CLOCKWISE FOR -1111, -CBANDS 1.5

14、 04 330 MMF. C7 CS 2-12 .04 r MMF L7 0.25. LEI C4 560 - MMF. A PRI 10 9 4 1535600O. 13 1C9 1 MED; 10. 54t to 1 R4 334A MOVABLE SEGMENTS L107(ROTOR) NT CSC6 470D82 MMFMMF SELECTIVITY SWITCH FUNCTIONS ONLY WHEN FIDELITY CONTROL IS IN EXTREME RIGHT HAND POSITION (FULL). 4SOMNIF. 14, MI stCIS t (CON VER

15、TER)-43oRmE t,147 I.F. 6L7 Jr Iv ,6157 sl- G-3.771 , g - -r, clo-,.2, 5LLI6. 9.)4, .I, ; * 1- CGO -ii, 3:./1 .-,-.,MIMEL-. RS ft ? :15 M ti i ci CI 2 ii., .01 MFD r4iS Iri. R2-1000 st 656 R7 100000. 5 C1/ 220 WAR 0.25 MFD. C43 2-12 c L3 MOVABLE SEGMENTS C44 53(ROTOR) 5100 MMF. L11 -.M ft A cgs cis-1

16、r Ia Ken71:111111 Ogr R3.3 147 C52 MMF. 1,1,9 CSI 4700 970 11,4, C48 z-zommi. I COO MFD. MMF. 120.000A R8 10004 CI3 .01 MFI -C14 B. L29 -I.3. CI 8 I C O L18L19 COO 05MF11 C19 t 0.15MFO. R14 330, ME 0.1 MFD I.F. 6147 r FV3 1100n -2- C54 IZOMMF. 1CS3 I11-430 MMF, R42 33,0003 R10 40004_ 1513 600014i 22

17、011414. C6I 20 MEDI1512 0 SC. = 1803 GLI 7 4- S0 C. I I L20-64 C2I 100 1.21-64 NW. C23 160 241.1F , I C22 .01 RI 1000, C24 120 MMF L23 L22I 54 L22 R20 1100 PHONO. BRCL REMOVE LINK FOR PHONO. , C29 .012.f0 2 DEC ., A.V.C. t! A.F.C,. 6H 6 -E- 019 410 .1.11M C26 = 100 MMF = C27 1 MED 1516 22000, 2_1_3

18、58 L.F. TONE CONTR. 4F -I S13 PHASE C30 INVERTER zz MMF 6007, C36 ,C37 01.015 MEG.:MFD. OUTPUT 6F6 SEE NOTE 1-1 4.3 W m MANUAL 1417 410,000a. RIB 22 SEG R21 2 ZMES. C3 .01 MCP 39800 1424 zcoott. z 0 C32 015MFO R29 OS R31 7000 C33 .01, MFDC34 330554 0251.1F0 TUNING TUBE 605 C56 MFO .05 1144 4 0551 0.

19、25IR43 MFD.1000 A OSC. CONTROL 647 NOTE. S7.-512;510 ARE MOUNTED ON MANUAL- ELECTRIC REMOTE CONTROL SWITCH. 51,58.-511 ARE MOUNTED ON LOW TONE (, POWER SW. RED 25.-5.3s SI RED T1 POWER SWITCH 0M L,R MOTOR 14 EE NOTE), LAMPSWWEE NOTE). -C .mANUAL- ELECTRIC MPS T3 RCA MEG, CO,INC 1LAMP SW. (SEE NOTE)

20、TOHEATERS 4. DIAL LA BLACK T 70801 0 GREEN R35 10 MEG. R36 1 MEG R34 II3,000n 0 C.,GREEN ,BROWN RECT 514 3003 025,-9004. 0-,8AOWN- C4 BLACK C. .BROWN uE L28 -rroo. MIL Fl ELD C57CS8 250AFO16 MFO 1130R37 90. TO HEATERS It 01 .1 ELECTRIC,_nL ii!iCit.)_IMANUAL MOTOR C35 0151440 9 1j0 113- 3 - 33,0004 C

21、38 0.5 MFD. R30- RANT to SFS = OUTPUT C33 .005 INFO C40 .005 MFD 5803 0000(ii00001- Ta r 304.111.24,1 C41 .005 AIM rC42 :,7,2 L27 8 L26.035 MFD. 323 10, NCOEUI LT. I1 , RECONZErrig:isrr REVERSINGREMOTE SW.S9 :CONNECTION (COM) - OSCILLATOR STOPPAGE OR INTERMITTENCY Where trouble develops due to lack

22、of oscillation on11A band, -SchematicCircuitDiagram or intermittent variation of sensitivity, carefullycheck capac- itors C5 and C49 for leakage or short circuit.A D.C. voltage in the order of 500 should be applied to these parts as a check for breakdown. ca-C.I 2.5 1.45.a SPEECHAAA MUSIC -SPEECH MU

23、SIC 25-. TUNING SI I -*-3_ 012 M.t0L STATION SELECTOR - DISC A MANUAL: 1 ELECTRIC REMOTE - MANUAL CONTROL SW.4LE CTRiC NOTE:Resistor R34 omitted on some mode Is. co 收音机爱 好者资料库 RadioFans.CN r- -sv.(_zio. ;2.9V. -.- 247V. ,1 , .-_71V_, 1 1100V. OV. -t- 375V. ELEcT371. !1OV. CAC! ;1 -21V. -, I 6.3Vj v

24、*1+1 247V. A.C. 370V.I (-21V.*) LOc).)_i OUTPUT C)._1-21V.t/I 6F6-eV C57 I II -I OUTPUT- 6F6 1/. 6 . - 6.3 V cflt7 A.L. A.C. toov.-1 (-at v.4+ 4:5 PHASE INVERTER 6N7 t, 190V. L 4.SV. 90y. GOV.190 V. 375V. RECT 5T4 360V. _ DV. r+:1t-437;,),Htj C.G. 6.3V/Ct)7T-C-SC. CONTROL 6-17 BLUEBLACK RESISTORRS R

25、IO511 TO TUNING ASSEMBLY 2471VI113-0V90V.23V+AY -105V -21 V.Lae 665 BLADSGSSEN R.F. 657 I* I ! (-3.2V1I t ov.200V.; j 2.0y. I I -IC.Gi I TERM24321 -RSV.- IBRO I (AO I1;6V A.C. 1185V.1 7TLIJJJI Is DET t3- 05C. 61.1 Isr. I. P TRANS. ELECT CAR C58 6J7 OCT. COIL 6.3V. A. C. BOTTOM VIEW- REAR OF CHASSIS

26、ELECT. CAP C50 -C61 657 PRI ADJ 2.st 1.F. TRANS. 2ss DET.A V C Ei A F. C 666 3 V6. E A.C.-1 :4Fsl,/ 51, 0(-1:17.-g.) S-17, -0.6V. (.0.25V.) (-5.251)11 TRANS.4- -0.3V.-016V. 657 00 Z22- 4,41? 247V. PAGE 597-B 812K (-3.2V.* -0.2V. 6.3V. A.C. I A rt-ti 6.3V. A.C. OV. 240V. PRI. 404. TRANS. P-84116-0 -R

27、adiotron Socket Voltages, Coil, and Trimmer Locations Measured at 115 volts, 60 -cycle supply -Tuned to approximately 1,000 kc (Broadcast) -Manual control -No signal being received -Volume control minimum -Fidelity control optional Note: Two voltage values are shown for some read- ings. The value sh

28、own in parentheses with asterisk (*) indicates operating conditions without voltmeter loading. TO POWER SUPPLY OSC.- C45OSC.-1.14OSC.- C51ANT - C2OSC - C43 6000 K.0 .600 K.C.1500 K.C., 20,00020,000 K.C. - DET.- CEF 20,000 K.C. OUTPUT OUTPUT 1-70819-0 KULAILLOW SLACK - SIIIMTULOW 010-171.LOW T1 COMP.

29、 PACK PHASE INVERTER GREEN STATION SELECTOR PUSH BUTTONS REVERSING. SW. ,BLACK 1 im.S LA cAmC _Ka-oR E01) tstThi1ACK-RECIIR. ADAPTS CONSECT If RECT.IOSC CONTR. O CSI 1 OSC.COIL F-YEI LOW - ResT r C45 141ED-BL; ItRID-GRE EN TUNINE- ANT-vim WELD/I COI L ix IA- B -C 513 GREEN HOLX- SLUE -YELLOW RIDOREE

30、N- A 7,._)-.- - - - GEEEN-YELL .-3 s 2. OCT., R.V.0 REDYELLOW ELLOW 2*.I.E BLUE -sl- R42 61476 ROREEDEN_- -0. 33, C43 STAT I ONSELECTOR 000A /./ DISCS / 6J7 / C54 0S3C / / COIA ID T -1c, MME C59i,i, 330MPAP 1A r,-1).-ef-BL7 g ,It BOTTOM TERM. AUDIO AMPLI- t 0 Ft( ATI ON AND A.FC SUPPRESSION C2 L.HOL

31、E -C BLACK UO_ 4. 01.2-2liLACKmm, BROWN L DIALSPEECHMUSIC LAMP NIS HOLED 419. I.F.3B0. I. F. TR ANSF.TRANSF. F TRANSF. ,RED -GREEN sukol-BROWN s BLUE BLUETOPOV tri,. 4F elAtit RID OAT TOMOP ref .TT.1.14. 3. R vOtcE MN . C. . CIO .RED l26 -,o Pt3.3.49LACK BROWN11.1,MI.:, re. 11.0,4 Cl 1 :.I CIT BO hi

32、m. EN MY SSO ,., N M LE1-13T C.g., II11.LI, s C .,r R o TUNING CABLE CONNECTIONS +n. .7-F1 .I, TK: LEI .,00I 1I.F. TRANS. CONNECTIONS2.0 1.F. TRANS. CONNECTIONS NBROW BROWN rt.-;- L24BLACK- - / ii, ILA. ROT 10M .0 oBROWNBLPCK- SPEAKER CONNECTIONS : 1 0 7 czi - oo C4 uo. ., ., 180 so TOM ii,NC,I_L 4

33、ST* I. F. TRANS. CONNECTIONS 4. LE TRANSE CONNECTIONS ,.BLUE - R14 GREEN- . T. 39.00. DET COIL CONNECTIONS TI flow- .POWER COMPENSATOR PACK CONNECTIONS I L. 1.1. .T. REDGREEN- 3u PP LT. .R ,CT ;IL REC, :,GREEN - EL. ,BROWN - MANUAL ELECTRIC REMOTE CONTR.S% - sx. : L14 Mik LIZ O. VA. Alickl : Pl%;,PL

34、ATIL .SLACK-SIMI oRowN- ;ETo ST Irsrsi % BLACK -Roo Es 4 In-VIII . Liff BLUE - hp- NCO.GRNIL01 - aL, 1511OWN- BLACK- GREEhillIN.0.110401 04r. n. 4 .LEL L 0BLUE .- (TAPED) YELLOW - Willi LI .7. .MOTOR - IA .BLACK NOT iNEERT CORRECTORT . .4 .- 7 ELL OW.- !t0 :2 7:N*DO i 7i. S4:.E, a i, i ra 0AC ANT CO

35、IL CONNECTIONS0Sc COIL CONNECTIONS Calibrate the tuning dial by adjusting left ends of horizontal calibration lines with condenser plates in full -mesh position. adjustment. The Fidelity control should be turned duringallalignmentoperations.The Remote switch should be turned to Manual ing alignment

36、unless otherwise specified. POWER SUPPLY RATIN UNIVERSAL TRANS. CONNECTIONS ALIGNMENT PROCEDURE dial pointer to theCAUTION.-The magnetite core screw L22 on the bot- the gang tuning-torn of the 4th i-f transformer has been accurately adjusted, This is a screw -driverfor an exact electral balance of c

37、oil L22 to center tap, during manufacture and should not be disturbed.HOwever, if for counter -clockwiseany reason the adjustment has been moved from id original Manual -Electric-position, it will be necessary to mechanically adjust this screw (right) dui-until the end of the stud protrudes exactly

38、3/16 of an inch (six threads exposed) above the brass bushing prior toany a ignment operations. Order Test Oscillator Range,ReceiverCircuit toAdjustmentAdjust to of AlignmentConnection to Receiver Dummy Antenna Frequency Setting SelectorDial SettingAdjustSymbolsObtain 1- 4th I -F Trans. L22 Tprn Ext

39、reme Counter- clockwise 2 6K7 2nd I -F Grid Cap .001 Mfd.460 kcA Left No Signal 550-750 kc 3rd I -F Trans . 1.20 and L21Max. (peak). 3 6K7 1st I -F Grid Cap .001 Mfd.460 kc A,No Signal 550-750 kc 2nd I -F Trans. L18. and L19Max. (peak) 4 81,7 Det Grid Cap .001 Mfd.460 kc ANo Signal 550-750 kc 1st I

40、-F Tram L15 and L16Max. (peak) 5Ant.300 Ohms 20,000 kcC Right20,000 kcC Osc.C49 Max. (Peak)* 6.Ant.300 Ohms20,000 kcC Rock thru 20,000 kc C DetC8Max. (peak) 7Ant.300 Ohms20,000 kc C20,000 kcC Ant.C2Max. (peak)$ 8Ant.300 Ohms6,000kcB Center 6,000kcB Osc.C45Max. (peak)* 9Ant.200 Mmfd.600 kcA Left 600

41、kcA Osc.L14Max. (peak) 10Ant.200 Mmfd.1,500 kc A 1,500 kcA Osc.C51Max. (peak) 11Ant.200 Mmfd.600 kc A 600 kcA Osc.L14Max. (peak) 12Ant.200 Mmfd.1,500 kc A 1,500 kcA Osc.C51Max. (peak) 13Proceed to A -F -C Discriminator Adjustments Outlined Below s Use minimum capacity peak if two pe;.ks can be obtai

42、ned. t Use maximum capacity peak if two peaks can be obtained. $ After this adjustment, check for image signal by shifting receiver dial to 19,080 kc. 0 PAGE 5 9 9-B 812 K A -F -C Discriminator Adjustments. -These adjustments are rather critical and should be performed with extreme care. Improper ad

43、justment may result in complete failure of the oscillator control tube to function or else may causeit to detune the oscillator instead of tuning it to the signal.It is assumed that the magnetite cbre adjusting screw L23 (top of 4th i-f transformer) has been turned all the way out (extreme counter -

44、clockwise)prior to the preceding tabulated adjust ments. -Adjustments are as follows: Remove spring N on link and arm assembly which connects the Manual -Electric- Remote switch shaft to the throw -out gear bracket. Turn Fidelity control counter -clockwise. Connect antenna to re- ceiver antenna A te

45、rminal.With the Manual -Electric Remote switch in Manual (right)position,tune ina strong local station near 600 kc or the low -frequency end of the A band as accurately as possible by means of the tun- ing tube Magic Eye. The most accurate adjustment will be obtained by adjusting the vernier tuning

46、knob mid -way between the two points where the eye just appears to start to open. This will place the generatedcarrier signal fre- quency exactly in the center of the i-f amplifier response curve (should be 460 kc ifamplifier was properly aligned), and is the frequency to which the a -f -c discrimin

47、ator (4th i-f transformer) should be tuned to resonance. Without dis- turbing any of the receiver adjustments, place the high test -oscillator lead about 3/4of. an inch from the grid cap lead of the RCA -6K7, 1stamplifier tube. adjust the test - oscillator output to maximum, turn test -oscillator Mo

48、dula- tion off, and carefully zero -bear the test -oscillator frequency (approximately 460 kc) with thei-fcarrier signal.Avoid placing the test -oscillator lead nearer to the grid cap lead than specified above, as doing so will tend to detune the i-f amplifier.It may be necessary to reduce the local

49、 station signal, during this operation, by shortening antenna lead or grounding antenna A terminal to chassis in order to in- crease the loudness of the beat note sufficiently for accurate zero -beat adjustment. Throw Manual -Electric -RemoteswitchtoElectric (center) position. A high whistle or beat note will now be heard. Turn the magnetite core screw L23 (top of 4th i-f transformer) slowly clockwise. As this screw is turned, the beat note will fi