RCA-Victor-Co-Inc-8M4 电路原理图.pdf

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1、PAGE i 86-C MODELS 8M3 and 8M4 Six -Tube, Superheterodyne Automobile Receivers Mode1BM3 Electrical Specifications RADIOTRON COMPLEMENT (1) RCA -6K7 -G R -F Amplifier (2) RCA -6A8 First Detector-Oscillator (3) RCA -6K7 I -F Amplifier TUNING RANGE POWER OUTPUT RATINGS Maximum. 9 watts Undistorted. 6 w

2、atts POWER SUPPLY RATING Supply Voltage 6.3 volts Current Drain. 7.5 amperes Fuse Protection. 15 ampere PILOT LAMP. Mazda No. 51, 7.5 volts, 0.2 ampere Power Switch and Volume Control Adjustment.-Rotate the Off -On -Volume control knob to its extreme clockwise position and then back to its extreme c

3、ounter -clockwise posi- tion. This sets the friction -clutch mechanism in proper align- ment. Alignment Antenna Compensating Capacitor.-Trimmer C3 is acces- sible by removing the plug button from the front cover of the receiver case. This trimmer must be adjusted for maxi- i.ium signal output on a w

4、eak station around 1,400 kc after installation and with the antenna properly connected. Cathode-ray alignment is preferable; the connections to the chassis are shown on figures 2 and 4. If an output indi- cator is used, connect it across the loudspeaker voice -coil and advance the receiver volume co

5、ntrol to full -volume position. On Model 8M4, the sensitivity control should be placed in its clockwise (maximum sensitivity) position. Connect the low output terminal of the test oscillator to the receiver chassis for all alignment operations. Regulate the Model 8M4 (4) RCA -6R7 -G Second Det., A -

6、F Amp., and A.V.C. (5) RCA -6J5 Audio Driver (6) RCA -6N7 -G Push -Pull Power Output 550 to 1,550 kc LOUDSPEAKER Type Electrodynamic Voice -Coil Impedance 3 ohms at 400 cycles Dial Pointer Adjustment.-Wttn receiver and control unit properly installed in car, rotate Tuning knob to its ex .treme clock

7、wise 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 adjusting screw at bottom of hole and turn with a small screwdriver until the pointer on dial is at the end calibra- tion m

8、ark 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. Procedure output of the test oscillator so that minimum signal .s applied to the receiver to obtain an observable output in

9、dication. This will avoid a -v -c action. The term Ant. Conn. means that the test -oscillator sig- ial should be applied to the receiver at the antenna con- nector on side of case. Dummy antenna means the device which must be connected between the high test -oscillator output and the point of connec

10、tion 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 local (heterodyne) oscillator. For further details on alignment, refer to booklet RCA Victor Rece

11、iver 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 Mfd. 260 kc No Signal 550-750 kc 2nd I -F Trans. L9 and L10 Max. (peak) 6A8 Det. Grid Cap550-

12、750 .001 Mfd. 260 kc No Signal kc 1st I -F Trans. L7 and L8 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 Ant. Conn. 150 Mmfd. 600 kc Rock Thru 600 kc L -F Osc. C10 Max. (peak) 6 Ant. Conn. 150 Mmfd. 1,

13、400 kc 1,400 kc H -F Osc. C11 Max. (peak) 7 Ant. Conn. 150 Mmfd. 1,400 kc 1,400 kc Det. C7 Max. (peak) 8 Ant. Conn. 150 Mmfd. 1,400 kc 1,400 kc Ant. C3* Max. (peak) * Re -adjust C3 after installation as outlined under Antenna Compensating Capacitor. RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERIC

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17、cD Po C,p 5 N G 2 .4- 111 P !HI ou+d f 2N DET. OUTPUT o 0 SEC 0 o 0 O I ADJ. 12, LIo 2601(c 0G.,: 6.8V(BM3) 1-, 6V I0.5V.18M4) 275V. a 0 DV 0 Ov. 6 0 6V. RCA P-84224-0 2.I. F. TRANSF. a0 S 0.2V. 140V. V. 275V. BOTTOM VIEW OF CHASSIS -Radiotron Socket Voltages and Trimmer Locations (Models 8M3 and 8M

18、4) (Measured at 6.3 volts battery supply-Volume control minimum-No signal input- Sensitivity control (Model 8M4) clockwise) To duplicate the conditions under which the above voltages were measured requires a 1,000 -ohm -per -volt d -c meter having ranges of 10, 50, 250, and 500 volts. Use the neares

19、t range above the indicated voltage value. Each value should hold within 20% when the receiver is normally operative at its rated battery voltage. REPLACEMENT PARTS Insist on genuine factory -tested parts, which are readily identied and may be purchased from authorized dealers. S No. DESCRIPTION STO

20、CK DESCRIPTION 13789 13543 30802 13141 14262 12404 30832 13894 11978 30433 14498 RECEIVER ASSEMBLIES Bracket-Chassis mounting bracket and stud as- sembly-Model 8M4 only Bracket-Chassis mounting bracket and stud as- sernbly-Model 8M3 only Capacitor -22 Mmfd. (Cl) Capacitor -47 Mmfd. (C16) Capacitor -

21、109 Mmfd. (C13, C14) Capacitor -120 Mmfd. (C17, C18) Capacitor -330 Mmfd. (C38, C39, C42, C43) -(C42, C43 in Model 8M4 only) Capacitor -390 Mmfd. (C19) Capacitor-Adjustable-400-800 Mmfd. (C10) Capacitor -470 Mmfd. (C44) Capacitor -680 Mmfd. (C2) 30800 30303 4838 4858 13695 4870 5196 4886 4839 30828

22、14902 30829 Capacitor -1,000 Mmfd. (C29, C35) Capacitor-.0035 Mfd. (C28) Capacitor-.005 Mfd. (C20) Capacitor-.01 Mfd. (C21, C28, C27) Capacitor-Two sections each .01 Mfd. (C33, C34) Capacitor-.025 Mfd. (C5, C40) - (C40 in Model 8M4 only) Capacitor-.035 Mfd. (C24) Capacitor-.05 Mfd. (C6, C9) Capacito

23、r -0.1 Mfd. (C15, C23) Capacitor-Two sections each 8 Mfd. (C36, C37) Capacitor-Comprising two sections, each 10 Mfd. (C22, C25)Model 8M3 only Capacitor-Comprising three sections, each 10 Mfd. (C22, C25, C41) Model 8M4 only PAGE i9O-C 8M3, 8M)4 REPLACEMENT PARTS (Continued) STIOoCK DESCRIPTION STOCK

24、DESCRIPTION 30793 Coil-Antenna coil and shield (L2) 30833 Housing-Reproducer housing complete - less 30792 Coil-Oscillator coil-less shield (L5, L6) speaker unit and cable 30794 Coil-R.F. coil-less shield (L3, L4) 9774 Reproducer-Speaker unit only-less case, cable, 30823 Condenser -3 -gang variable

25、tuning condenser and mounting parts Screw-Reproducer housing (C3, C4, C7, C8, C11, C12) 13797 screw 12882 Core-Adjustable core and stud for antenna coil 12006 Core-Adjustable core and stud for I.F. trans- former CONTROL BOX ASSEMBLIES Model 8 M3 13996 Coupling-Insulated coupling for tuning con- dens

26、er shaft 30817 Cord-Dial drive cord -25 ft. length only. 13691 Filter-Antenna filter (Ll) 30820 Cover-Cover shell and spring used on control 30824 Gear-Large gear for condenser rotor shaft shafts, beneath knobs 30825 Gear-Small worm gear for condenser Guide-Volume 13694 30818 Dial-Round etched glass

27、 dial control shaft guide Reactor-Filter reactor (L14) 13111 30813 Dial Unit-Comprising round dial, escutcheon, 30540 Resistor -100 ohms, insulated, 4 watt (R17, R18) pointer disc, spring barrel, and cord assembled -less dial lamp and dial lamp socket 12261 Resistor -390 ohms, insulated, 4 watt (R2,

28、 R5) -Model 8M3 only 14720 Resistor -1,000 ohms, insulated, * watt (R2)- Model 8M4 only 30819 Indicator -Indicator pointer disc 12267 Resistor -1,200 ohms, insulated, watt (R15) 11765 Lamp-Dial lamp 12194 Resistor -1,800 ohms, insulated, watt (R5) 30816 Socket-Dial lamp socket and lead -Model 8M4 on

29、ly 30814 Tuning Unit-Comprising knob shaft, bearing, 13716 Resistor -2,200 ohms, insulated, watt (R19) and gear case-less knob -Model 8M4 only 30815 Volume Unit-Comprising knob shaft, bearing, 12312 Resistor -3,300 ohms, insulated, watt (R10) and on -off switch-less knob 13669 Resistor -22,000 ohms,

30、 carbon type, 2 watt (R3) CONTROL BOX ASSEMBLIES 11646 12286 Resistor -47,000 ohms, insulated, watt (R13) Resistor -56,000 ohms, insulated, watt (R4). Model 8M4 13715 Resistor -68,000 ohms, insulated, 4 watt (R9, R14) 13792 Cable -3 -conductor shielded tone and sensitivity cable complete with 4 -pro

31、ng plug 11281 Resistor -100,000 ohms, carbon type, 1/10 watt (R1) 30817 Cord-Dial drive cord -25 ft. length only 13734 Resistor -120,000 ohms, insulated, i watt (R7) -Model 8M4 only 30818 Dial-Round etched glass dial 13698 Resistor -180,000 ohms, insulated, watt (R7) -Model 8M3 only 12264 Resistor -

32、220,000 ohms, insulated, watt (R6) 30813 Dial Unit-Comprising round dial, escutcheon, 13730 Resistor -1 meg., insulated, 4 watt (R11, R12) pointer disc, spring barrel and cord assembled 3584 Ring-Retaining ring for R.F. coil shield -less dial lamp and dial lamp socket 13472 Ring-Retaining ring for o

33、scillator coil shield. 30819 Indicator-Indicator pointer disc 13471 5129 Ring-Retaining ring for antenna coil shield. Ring-Tube-shield ring 30837 Knob-W,ing knob 3623 Shield-R.F. or oscillator coil shield 11765 Lamp-Dial lamp 14491 Shield-Antenna coil shield 30816 Socket-Dial lamp socket and lead 12

34、008 Shield-I.F, transformer shield can 30835 Tuning Unit-Comprising knob shafts, bearing, 12218 Shield-Tube shield and ring gear case and sensitivity switch-less knobs 11196 Socket-Radiotron socket 30836 Volume Unit-Comprising knob shafts, bearing, 12241 Socket-Vibrator socket tone control and on -o

35、ff switch-less knobs. 12007 Spring-Retaining spring for core, Stock Nos. MISCELLANEOUS ASSEMBLIES 12882 and 12006 30796 Transformer-First I.F. transformer (L7, L8, C13, C14) 30839 Case-Receiver case complete-less speaker grille -Model 8M3 only 30483 Transformer-Second I.F. transformer (L9, 30840 Cas

36、e-Receiver case complete-Model 8M4 only L10, C17, C18) 13109 Capacitor -0.5 Mfd. (C31) 12230 Transformer-Audio transformer (T2, T3). 4293 Capacitor-Ammeter capacitor 30827 Transformer-Vibrator power transformer (T1, 5025 Capacitor-Generator capacitor L13, C32) 5023 Fuse -15 ampere 12236 Vibrator 308

37、38 Grille-Speaker grille and cloth-Model 8M3 13711 Volume Control (R8) only 4290 Insulator-Fuse holder insulator REPRODUCER ASSEMBLIES (72684-1) 30642 Knob-Tone control knob-Model 8M3 only Model 8M3 7766 Lead-A lead (ammeter end) complete with clip 12482 Board-Reproducer terminal board 12445 Lead-A

38、lead (set end), complete with male 12450 Coil-Field coil (L12) section of connector 12451 Cone-Reproducer cone complete (L15) 13806 Ring-Soft rubber ring for speaker mounting - 9687 Reproducer-Complete Model 8M4 only 30811 Shaft-Tuning control flexible shaft -approx. REPRODUCER ASSEMBLIES 13926 Sh25

39、-in, long Shaft-Volume control flexible shaft -approx. Model 8M4 25 -in. long 12248 Socket-Bracket and socket for speaker cable - 13794 Cable -3 -conductor shielded reproducer cable, Model 8M3 only approx. 18 -in. long, complete with 3 -contact male connector 12502 Socket-Bracket and socket for tone

40、 control lead -Model 8M3 only 13795 Coil-Reproducer field coil (L12) for speaker marked 72947-1 13804 Socket-Bracket and socket for speaker and con - trol box cables-Model 8M4 only 13796 Cone-Reproducer cone and dust cap (L15) for speaker marked 72947-1 12254 Stud-Speaker mounting stud, spacer, and

41、washer assembly-Model 8M4 only 30834 Cone-Reproducer cone and dust cap for speaker marked 72947-22 (L15) 12448 Stud-Receiver mounting stud, washer, and nut assembly 11984 Connector -3 -contact male connector for repro- 5024 Suppressor-Distributor suppressor ducer cable 12249 Tone Control-(R16)-Model 8M3 only