RCA-Victor-Co-Inc-8M1 电路原理图.pdf

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1、PAGE f31 -C Model 8M1 MODELS 8M1 and 8M2 Six -Tube, Superheterodyne Automobile Receivers Electrical Specifications RADIOTRON COMPLEMENT (1) RCA -6K7 -G R -F Amplifier (2) RCA -6A8 First Detector-Oscillator (3) RCA -6K7 I -F Amplifier Model 8M2 (4) RCA -6Q7 -G. Second Det., A -F Amp., and A.V.C. (5)

2、RCA -6K6 -G Power Output (6) RCA -6X5 -G Full -Wave Rectifier TUNING RANGE 550 to 1,550 kc POWER OUTPUT RATINGS Maximum 3.5 watts Undistorted 1.75 watts POWER SUPPLY RATING Supply Voltage 6.3 volts Current Drain 6.6 amperes Fuse Protection 15 ampere PILOT LAMP. . Mazda No. 51. 7.5 volts, 0.2 amp. LO

3、UDSPEAKER Type Electrodynamic Voice -Coil Impedance 3 ohms at 400 cycles NOTE: Change CI frost 680 ststfd to 300-400 wed for use with high capacity built-in antennas. Alignment Procedure Calibrate the tuning -dial pointer to the low -frequency calibration mark as outlined under Dial Pointer Adjust-

4、ment. Perform alignment in proper order tabulated below, start- ing with No. 1 and following all operations across, then No. 2, etc. Adjustment locations are shown on figures 8 and 9. Cathode-ray alignment is preferable; the connections to the chassis are: Vertical Hi to yellow volume -control lead,

5、 0 - to chassis. If an output indicator is used, connect it across the loudspeaker voice coil and advance the receiver volume control to full -volume position. Connect the low output terminal of the test oscillator to the receiver chassis for all alignment operations. Regulate the output of the test

6、 oscillator so that minimum signal is applied to the receiver to obtain an observable output indica- tion. This will avoid a -v -c action. The term Ant. Conn. means that the test oscillator signal should be applied to the receiver at the antenna con- nector on side of case. Dummy antenna means the d

7、evice which must be connected between the high test -oscillator output and the point of connection to the receiver in order to obtain ideal alignment. No signal, 550-750 kc means that the receiver should be tuned to a point between 550 and 750 kc where no signal is received from a station or the loc

8、al (heterodyne) oscillator. For further details on alignment, refer to booklet RCA Victor Receiver Alignment. Order of Alignment Test Oscillator Receiver Dial Setting Circuit to Adjust Adjustment Symbols Adjust to Obtain Connection to Receiver Dummy Antenna Frequency Setting 1 6K7 I -F Grid Cap 001

9、Mfd. 260 kc No Si Signal 550-.750 kc 2nd I -F Trans. L8 and L9 Max. (peak) 26A8 Det. Grid Cap .001 Mfd.260 kc No Signal 550-750 kc 1st I -F Trans. L6 and L7 Max. (peak) 3 Ant. Conn. 150 Mmfd. 600 kc 600 kc L -F Osc. C10 Max. (peak) 4 Ant. Conn. 150 Mmfd. 1,400 kc 1,400 kc H -F Osc. C11 Max. (peak) 5

10、 Ant. Conn. 150 Mmfd. 600 kc Rock Thru 600 kc L -F Osc. C10 Max. (peak) 6 Ant. Conn. 150 Mmfd. 1,400 kc 1,400 kc H -F Osc. Cu Max. (peak) 7 Ant. Conn. 150 Mmfd. 1,400 kc 1,400 kc Det. C6 Max. (peak) 8 Ant. Conn. 150 Mmfd. 1,400 kc 1,400 kc Ant. C2* Max. (peak) * Re -adjust CO after installation as o

11、utlined wider Antenna Compensating Capacitor. 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 PACE i82 -C 收音机爱 好者资料库 RadioFans.CN e4 Nf Un ,o HI _- O 11 ZZaO M O -oUcCo b - H-IP o N M -. -ww 7 .- 00 0 0 cC 4 Q 00) -, li 4061M 2 cD iu f u 2 J c%1 J

12、o w 2 -re2 U r 2 0 .,o 0 J d O w LILM L :-.C-; 2 I f L.) N ood cc te i1 o N II M 9 Urn 21 Ls_ - oru O CC N iti lfee.s J H A. - N ln OOD rey N u vv+ Up UM U Jp d O co dr I u_ 1141. Q a HI, C x N m - O. al V 11 W r a o L na. H O 2 Q PAGE i83-C 8M 1 , 8M2 收音机爱 好者资料库 RadioFans.CN PAGE 184-C SMI, 8M2 LB

13、PRI. ADJ 260 KC - - GEC.ADJ. 1 860 KC 15Tr.F TRANS. r ITRANSJ V 2Ha.DET.I;A.VC. RCA 15T DET.$OSC 6A8 OUTPUT 1,400 KC L.F.OSC. C10 600 KC OET.-C6 1400 K C SN -715 - OSC.-CI1 -ANT.-C2 1,400 KC Figure 8-Radiotron and Trimmer Locations (Models 81111 and 8M2) Service Data Antenna Compensating Capacitor.-

14、Trimmer C2 is ac- cessible by removing the plug button from the front cover of the receiver case. This trimmer must be adjusted for maximum signal out. put on a weak station near 1,400 kc after installation and with the antenna properly connected. Dial Pointer Adjustment.-With receiver and control u

15、nit properly installed in car, rotate tuning knob to its extreme clockwise position and then to its extreme counter -clockwise position, irrespective of location of pointer on dial. Pull out dial lamp socket from control unit, locate the pointer adjust- ing screw at bottom of hole and turn with a sm

16、all screw- driver until the pointer on dial is at the end calibration mark beyond 55 on the dial scale. Final adjustment may be made, if desired, by tuning in a station of known frequency and adjusting dial pointer to the frequency of the station. Power Switch and Volume Control Adjustment.-Rotate t

17、he Off-OnVolume control knob to its extreme clockwise position and then back to its extreme counter -clockwise posi- tion. This sets the friction -clutch mechanism in proper align- ment. RECT. 6X5-6 RCA04206-0 2iov. 0 RED-! C30 245V. -GREEN) C31: L6 -TO 260 KC 3.2V. 245V. 6v. /OCSI I SfP,.J 1 C.G. L

18、- H d 85V.- R.F. O 6KT-G PRI. ADJ. DET.b OSC. I* I.F.TRANSF. * -_-_ GAB . , - 85V.- . 85V. - - -r61 Q f1-1 -245V.- _ 4 W y I rT - c.G. K O ,- J -85V.- 6K7 t.c. -245V.-# - 0V.- G.G. , L9 SAOJ.EC. 260 KC 2-I.F. TRANSF. *THIS VALUE MAY VARY APPRECIABLY. 6 V. I 2- DET., J 4 A.V. C. 1.5V. 601-G O V. # 55

19、V. I t t BOTTOM VIEW OF CHASSIS NOTE:ON CHASSIS USING LEO IN PLACE OF RI4, THE PLATE VOLTAGE IS 5 VOLTS LOWER THAN SCREEN ON TUBE. No.5 OUTPUT 6156-G r r-1TV.- r IF1 6IV. OV. 265V. I 2451/.44 I t f t Figure 9-Radiotron Socket Voltages and Trimmer Locations (Models 8M1 and 8M2) (Measured at 6.3 volts

20、 battery supply-Volume control minimum-No signal input) To duplicate the. conditions under which the above voltages were measured requires a 1,000-ohmper-volt d -c meter having ranges of 10, 50, 250, and 500 volts. Use the nearest range above the indicated voltage value. Each value should hold withi

21、n 20% when the receiver is normally operativ e at its rated battery voltage. REPLACEMENT PARTS Insist on genuine factory -tested parts, which are readily identified and may be purchased from authorized dealers. Stoock DESCRIPTION Stock DESCRIPTION RECEIVER ASSEMBLIES 14393 Capacitor-.01 Mfd. (C21) 1

22、3543 Bracket-Chassis mounting bottom bracket and 4858 Capacitor-.01 Mfd. (C22, C23) studs assembly 4870 Capacitor-.025 Mfd. (C4) 11978 Capacitor-Adjustable trimmer (C10) 5196 Capacitor-.035 Mfd. (C34)-Model 8M2 only. 30802 Capacitor -22 Mmfd. (C36) 4886 Capacitor-.05 Mfd. (C5, C8) 14262 Capacitor -1

23、09 Mmfd. (C13, C14) 483C Capacitor -0.1 Mfd. (C15) 12404 Capacitor -120 Mmfd. (C17, C18) 30797 Capacitor Pack-Comprising two sections each 12952 Capacitor -330 Mmfd. (C32, C33)-Model 8M2 8 Mfd. (C30, C31) only 30793 Coil-Antenna coil and shield (L1) * 13894 Capacitor -390 Mmfd. (C19) 30792 Coil-Osci

24、llator coil-less shield (L4, L5). 14498 Capacitor -680 Mmfd. (C1) 30794 Coil-R.F. coil-less shield (L2, L3) 30800 Capacitor -1,000 Mmfd. (C27) 30790 Condenser -3 -gang variable tuning condenser 4838 Capacitor-.005 Mfd. (C24) (C2, C3, C6, C7, C11, C12) 5148 Capacitor-.007 Mfd. (C35)-Model 8M2 only. 1

25、2006 Core-Adjustable core and stud for I.F. trans- * 30626 Capacitor-.0075 Mfd. (C16) formers PAGE i8S-C BMI, REPLACEMENT PARTS (Continued) 8142 Stock No. DESCRIPTION Stock No. DESCRIPTION 12882 Core-Adjustable core and stud for antenna coil 30809 Housing-Receiver case-less speaker screen- Model 8M1

26、 only 30798 Coupling-Tuning condenser flexible shaft in- 30810 Housing-Receiver case-Model 8M2 only sulating coupling 4290 Insulator-Fuse holder insulating sleeve 13691 Filter-Antenna filter (L14) 30642 Knob-Tone control knob-Model 8M2 only. 30791 Gear-Large gear located on shaft of tuning condenser

27、 7766 Lead-A lead-ammeter end-complete with female section of fuse holder 13694 Guide-Volume control flexible shaft guide. 12445 Lead-A lead-chassis end-complete with 30801 14561 Pin-Contact pin for tone control lead Resistor -220 ohms, insulated, watt (R2, R5) -(R5 in Model 8M2 only) 13708 male sec

28、tion of connector Lead-Antenna lead-in, approx. 36 in. long com- plete with 2 male sections of connector 30538 Resistor -330 ohms, insulated, * watt (R5)- 30811 Shaft-Flexible shaft for tuning control-approx. Model 8M1 only 2511 in. long 5164 Resistor -560 ohms, carbon type watt (R13) 13926 Shaft-Fl

29、exible shaft for volume control-approx. 6134 Resistor -1,200 ohms, carbon type, 1 watt (R14) 12502 251 in. long Socket-Pin-socket and bracket assembly for tone 30146 * 12696 Resistor -4,700 ohms, insulated, watt (RS). Resistor -15,000 ohms, insulated, watt (R15) 12248 control lead-Model 8M2 only Soc

30、ket -3 -contact socket and bracket for speaker 11671 Resistor -18,000 ohms, carbon type, 2 watt (R6) cable-Model 8M2 only * 12454 Resistor -33,000 ohms, insulated, watt (R17) 12254 Stud-Speaker mounting stud assembly for Model -Model 8M2 only 8M2 12412 Resistor -47,000 ohms, insulated, watt (R18) -M

31、odel 8M2 only 12448 Stud-Rece.ver mounting stud, washer and nut assembly 12286 Resistor -58,000 ohms, insulated, * watt (R4) 5024 Suppressor-Distributor suppressor 11281 Resistor -100,000 ohms, insulated, 1/10 Watt 12249 Tone control-Model 8M2 only (Rl) * MISCELLANEOUS SUBSTITUTE PARTS 12285 Resisto

32、r -470,000 ohms, insulated, * watt (R11, R12) NOTE No. 1-MODEL 8M1 (Run A) 13730 Resistor -1 Meg., insulated, * watt (R10) A portion of these receivers were constructed 12201 Resistor -1.5 Meg., insulated, * watt (R7) with a second i -f transformer different from that 3584 Ring-Retaining ring for R.

33、F. coil shield listed above. Such receivers may be identified by 5129 Ring-Retaining ring fop Radiotron shield letter A preceding the code stamped on the 13472 Ring-Retaining ring for oscillator coil shield chassis partition (e. g. A7M20 etc.) and also 13471 Ring-Retaining ring for antenna coil shie

34、ld by reference to figure 3. 12218 Shield-Radiotron shield For replacements in such receivers, do not use 13686 Socket -4 -contact vibrator socket i -f transformer Stock No. 30483 or capacitor 11196 Socket -8 -contact Radiotron socket (C17 and C18) Stock No. 12404 listed above. 12007 Spring-Retainin

35、g spring for core Stock Nos. Instead use: 12882 or 12006 30407 Capacitor -115 Mmfd. (C17 and C18) 30796 Transformer-First I -F transformer (L6, L7, C13, C14) 13693 Transformer-Second I -F transformer (L8, L9, C17, C18) (this unit stamped 72970-1). * 30483 30795 * 30799 13688 13420 12365 Transformer-

36、Second I -F transformer (L8, L9, C17, C18) (this unit stamped 84096-4) Transfcrmer-Output transformer (T2) Transformer-Vibrator power transformer (Tl, L12, C28) Vibrator-Plug-in vibrator Volume Control-Model 8M1 only (R9) Volume Control-Model 8M2 only (R9) NOTE No. 2-MODEL 8M2 (Run A) A portion of t

37、hese receivers were constructed with a vibrator transformer different from that listed above. Such receivers may be identified by letter A preceding the code stamped on the chassis partition (e. g. A7M20 etc.) and also by presence of two additional and separate choke coils (L12 and L20). Refer to fi

38、gures 5 and 6. REPRODUCER ASSEMBLIES (84173-4) Model 8M1 For replacements in such receivers, do not use vibrator transformer Stock No. 30799; capacitor Stock 30804 30803 Cone-Reproducer cone and voice coil (L13) Reproducer-Complete (L11, L13) (C16) Stock No. 30626; resistor (R14) o. 6134;us or resis

39、tor (R15) Stock No. 12695. REPRODUCER ASSEMBLIES (84189-2) 13695 Capacitor -2 sections; each .01 Mfd. (C50, C51) Model 8M2 5019 Capacitor -0.5 Mfd. (C28) 30806 30808 Cable speaker cable corn- 30255 13696 13690 Coil-A filter choke coil (L12) Coil-B choke coil (L20) Transformer-Vibrator power transfor

40、mer (T1) B) -3 -conductor shielded plete with male plug Cone-Reproducer cone and voice coil (L13) 30805 Housing-Reproducer housing complete, less speaker unit and cable NOTE No. 3-MODEL 8M2 (Run A portion of these receivers were constructed 30807 Reproducer-Speaker unit only-less case, cable, and mo

41、unting parts (L11, L13) CONTROL BOX ASSEMBLIES Models 8M1 and 8M2 with a second i.f. transformer different from that listed above, and the substitution of a B choke coil in place of resistor (R14). Such receivers may be identified by letter B preceding the code stamped on the chassis partition (e. g

42、. B7M20 30817 Cord-Dial drive cord -25 ft. length only etc.) and by the presence of an iron core B 30820 Cover-Cover shell and spring used on control shafts, beneath knobs choke coil (L20) in the power unit section. Refer to figures 4 and 5. For replacements in such receivers, do not use 30818 Dial-

43、Round etched glass dial resistor (R14) Stock No. 6134; i -f transformer 30813 Dial Unit-Comprising round dial, escutcheon, pointer disc, spring barrel, and cord assembled -less dial lamp and dial lamp socket Stock No. 30483; capacitor (C17, C18) Stock No. 12404; resistor (R17) Stock No. 12454; or ca

44、pacitor (C19) Stock No. 13894. Instead use: 30407 Capacitor -115 Mmfd. (C17, C18) 12761 Capacitor -265 Mmfd. (C19) 30819 Indicator-Indicator pointer disc 1369E Coil-B choke coil (L20) 11765 Lamp-Dial lamp 5132 Resistor -47,000 ohms, carbon type, 1/10 watt 30816 Socket-Dial lamp socket and lead (R17)

45、 30814 Tuning Unit-Comprising knob shaft, bearing, and gear case-less knob 12229 Transformer-Second I -F transformer (L8, L9, C17, C18, C19, R17) (this unit stamped 30815 Volume Unit-Comprising knob shaft, bearing, and on -off switch-less knob 72652-2) NOTE No. 4-MODEL 8M2 (Run C) Note-Knobs, escutc

46、heon, and mounting parts are included in kits to be supplied by dealer for particular car in which installations is to be made. MISCELLANEOUS ASSEMBLIES A portion of these receivers were constructed with an iron core B choke coil (L20) in - stead of resistor (R14). Such receivers may be identified b

47、y letter C preceding the code stamped on the chassis partition (e. g. C7M20 4293 5025 13109 5023 Capacitor-Ammeter capacitor Capacitor-Generator capacitor Capacitor -0.5 Mfd. (C26) Fuse -16 ampere 13696 etc.). Refer to figure 5. For replacements in such receivers, do not use resistor (R14) Stock No. 6134. Instead use: Coil-B choke coil (L20)