RCA-Victor-Co-Inc-RC-418A 电路原理图.pdf

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1、MANUAL OF 1939 MOST POPULAR SERVICE DIAGRAMS MODELS K-50 and T-55 Chassis Nos. RC-418A and- RC-418 RC-418 6SA7 lar PET-OSC- 6Sa7 ivf. PET.-AF-AVC S3 TONE COtiTIJOL Switch L 6 U r?rc * dotted CtRCUTS OM K So (RC4I6A) ONLY. - C 20 SfeO MMF Note.I n some sets a iiected across C5. 12 mmfd. capacitor is

2、con- -6ReM-R50TR. BROWM 30 . 60, Q _ brown- J BLACK MS 350. (,Cr Adjustments for Push-Button Tuning 1. Pull off the push-buttons and loosen the push-button rods with a small screwdriver. 2. Set the radio-phono switch to “radio position and accurately tune in the station for which the first button is

3、 to be set. 3. Press in push-button rod No. I (left) with the screw driver, as far as it will go without undue pressure, hold in, retune station with manual control if necessary for best reception, and then carefully tighten up the rod. Do not tighten more than 1/4 turn after the rod begins to grip

4、or damage to the mechanism may result. 4. Replace the push-button on its shaft. 5. Proceed in a similar manner for the remainder of the push-buttons 6. Insert the station marker tabs in the recesses above the push-buttons. CONTROL C2 1500 KC. L1.0SC. 600 KC. S3_TOMe COnTROL 5W. , K50 ONLY iTf OU1WT

5、otrmjT R4-. VOL.CONTROL si - POWER SW. ant. COJL ON RCA1 dress ground wire to volume control between power cabinet and can not be used for reference during alignment. leads and audio grid; and dress lead from phono switch to Therefore calibration marks have been stamped in the plate volume control a

6、s far away from power leads as possible. on the front of the chassis as shown in the accompanying drawing. These marks are used for reference during align - Cathode -Ray Alignment is the preferable method. Con ment. nections for the oscillograph are shown on the chassis schematics. Dial Indicator Ad

7、justment. - With the gang condenser in full mesh, the indicator should point to the extreme left Output Meter Alignment.-If this method is used, connect (low frequency) mark on the dial scale. the output meter across the voice coil, and turn the receiver For additional details, refer to booklet RCA

8、Victor volume control to maximum. Receiver Alignment. RC -418, RC-4I8A Steps Connect the high side of the test-osc. to- Tune test osc. to- Turn radio dial to Adjust the following for maximum peak output 1 Antenna terminal Quiet Point C10 and C11 (2nd I -F trans.) 2 Antenna terminal 455 kc between 1,

9、720-1,500 kc C6 and C7 (1st I -F trans.) 3 Ant. terminal in series 1,500 kc 1,500 kc calibration mark C5 (osc.) C2 (ant.) 4 with 200 mmfd. 600 kc 600 kc calibration mark Li (osc.) (Rock in) 5 Repeat step 3 RC -497 Steps Connect test-osc. output to- Tune test- osc. to- Turn radio dial to- Adjust the

10、following for maximum peak output I -F grid through 0.1 mfd. capacitor and ground Quiet point IA and L5 (2nd I -F trans.) 2 1st det. grid through 0.1 mfd. capacitor and ground 455 kc between 600-700 kc L2 and LS (1st I -F tratis.) 3 1,500 kc 1,500 kc C2 antenna C5 oscillator 4 Radiation loop consist

11、ing of two turns of wire 18 inches in diameter located 4 to 600 kc Rock at 600 kc Ll oscillator while rocking 5 6 feet from receiver 1,500 kc 1,500 kc C2 antenna C5 oscillator* When making adjustments 3 to 5 inclusive the chassis must be in the cabinet, the loop connected, and all leads in their nor

12、mal positions. When mounting chassis in cabinet if calibration marks on dial plate do not line up with dial scale mounted on cabinet move pointer to agree with dial scale on cabinet. S3 _TONE R4_ VOL. CONTROL 53_TONE R4. VOL.CONTROL TUNING ,CONTROL SW. 91 -POWER $W. TUNING CONTROL 5W 91 - POWER SW.

13、CONTROL jl K50 ONLY I CONTROL - - 1 e C2 C5 1500 KC. C5 7 T i 1500 KC. / SN -Ion RC -497 04-504) 1500 KC LI.OSC. 600 KC 2ND. DET. AF_AVC 0 L1. OSC 600 KC 2ND. DET. -TOP AF_AVC L.800 ANT. COIL ON RC418A C 10,C 11 455 KC. OUTPUT 4 SOCKET M OUTPUT - 455NC (K50) ONLY IST.I.F 2 ND. I.F 6F6G ST.I.F, 2ND.I

14、.F 1 TRANS. TRANS. LOOPI L9 iLIO I.F TERM. CD i T1 POWER 3 o o J TRANS. TRANS11 o J I.F m TI POWER BOARD RC418J crss) I e I57 6SA7 DET 2 5 6SK7 CIT 5Y3G TRANS, . 15T DET.- I osc. 6SA7 Z.* 5 c,4 5Y3G TRANS. ONLY, OSC. 6) C18ci G CTS fm m m A G L C6. C7 til PN. LiR 53 RECT L3 -TOP NI PH. R RECT 455 KC

15、. TERM. BOARD VICTROLA RADIO-PRONo icue. Rcais C5 L2 -BOTTOM PH ONO RADIO- PHONO RC418AK50)ONLY JACK SWITCH s,-sso 150014C 455NC JACK SWITCH Tube and Trimmer Locations Tube and Trimmer Locations MODELS K-50 (RC -418A) T-55, T-56 (RC -418) MODEL K-50 (RC -497) 收音机爱 好者资料库 RadioFans.CN PAGE 506-C K-50,

16、 T55, T56 BOTTOM VIEW 0, 65 A7 TUBE SOCKETS. llTDET-05C. LOOP T55 (KIN) ONLY R !+ L 10 5n CI 10-421 MMF. 9IF e4C7ao4 MM. IST LF I I BLUE TRANS I c C4 o fr EMME -GRIM Lt Lt 214 2 BLACK 1aI 6557 7 2I0 PET- F-AVC 9J,00, 10-429 b II MMF. LI 4.8 O K CB 2 -Lo MM I 6244 NNE. 2ND. IF TRANS. RE 15,002 6RN 1

17、L4 LS I 0 21A 214 g CIt ISO MMF. R3 VICTROLA 2.2 MEG 7 JACK 2 C21 .01 Mr0 2 r-iF fRp 4.27 009_ VOL.00NTR0L I 3 1 MILL Sa RAOIo-HOHO. 3W ITCH CIS .0) MED R7 470,000 R4 47qoo0 n CIA .01 WM. T55 ONLY R 1S DOTTED CIRCUTS Cri K 5o (RC418A) ONLY. Note.-In some Sets a 12 nunhl. capacitor is con- nected acr

18、oss C5. TA RC 418A ONLY 6SQ7 2nD. DET. AF-AVC. ALL HEATERS 6.6 v. AC, EXCEPT 5Y3-3 5.1 V AC. 2130V. 263Y. *DOUBLE STARRED UNITS0 ARE ON K-53 (RC416A)iNLY. C4 RE D RED SI SWITCH ON VOL .CONTROL a * S3 TONE CONTROL SWITCH o-1 MMF i c22 T . MED.; b F 6 OUTPUT R8 390n i _M c1) 04, C U1 OO2S MID. GREEN R

19、EDTR GREEN-REDTR, BROWN - tC BROWN - BLOCK 350. 6L-, BRowN BLUE rTO ALL HEATERS BLUE AND DIAL LAMP Vl tl. Schematic Circuit Diauran) RS 10 MES Le FIELD 10600. C17 4 CU MFPT I MED. 5Y3 -G RECT. MODELS K-50 (RC -418A) T-55, T-56 (RC -418) E2, O SC IL LOUR APH CONNECTIONS VERTICAL NI. 70 THIS TERMINAL,

20、 VERTICAL O TO CHASSIS. 2ND. I.F TRANS. C17 5Y3 -G RECT. CATHODE CURRENTS III 6517 11.5 MA. (21 6547 16.0 NA. 13) 6567 0.4 MA. 14) 6F6 -G- 43.0 MA. TOTAL RECTIFIED B CURRENT. .70.0 MA. -L r c22 , 92 RADIO -PHON SWITCH aYI OS MFD. L6 HUM NEUT. COIL 440. Irr L7 RC418i RC418A T-88774-2 VOLTAGES SHOULD

21、HOLD WITHIN 420% WITH r l / a 117 V. AC. SUPPLY. STARRED VOLTAGES ARE OPERATING 155,3 1TONE VOLTAGES IN CIRCUITS WITH HISS SERIES RESISTANCE; ICONTROL THE ACTUAL MEASURED VOLTAGES WILL BE SWITCH LOWER,DEPENDING ON THE VOLTMETER LOADING. 4t_I fl VICTROLA I .LACK BOTTOM VIEW- REAR OF CHASSIS R -F Wiri

22、ng Diagram and Socket Voltages 260 V. COIL TAP II L9 L10 F,J4-1 u A1YT. -i - Go4 LIO 6SA7 IST DET-OSC. RC41Bi RC 403A K-50, T55, T56 PAGr 507-C 4 S N I n O rd ,a$ x. mi mOl1 u-f d F rc N 1s W .90- FN p . C yta iv -I O 1M/ ri J - F F 11 -. il r z toll. Z U SQ ca O DU , II 1.-. l7F a N WW W v ISp , .-

23、 de fy $ b Fa Wg R W . de J R f -. QS OO F Y o 0 Y o II 6 z / F- Z i ; = 4 f IQ ato -7490 C LLi W R i 1 R WV (7/t7 m m m U., r 1 Vii W ASI.l. z$ - u Ifb63; N W r- oc _ Li: F 2 umF vc:iE -4-711. S VVVV 4 IIhNOa Lr c04 uo. eOV- Nn U v$ 6-11-4 /ry O o, 1- .z. a: o -b L/ G V E y ei v) d a E. : E d E oU

24、w 8 d d .9 . d E ao ao U. u d m a L y N J d O a a : O o O a b W V . LI o U. b w ti O h _ OO ro m O .m $oE - U e Om O C- 7-0 N CO . .a d OD .D 3 v w O E d s 3 E . oi 7 pdp . . . G9 O V.0 b 0 . $ eN. re d 11-od1 g o, co ti E 1p,. (5 -13, EadCv d fr W 0 -o ed ea C 9 9 PAGE 508-C K-50, T55, T56 Replacem

25、ent Parts Insist on genuine Factory -tested parts, which are readily identified and may be purchased from authorized dealers. STOoCK DESCRIPTION STOCK DESCRIPTION ASSEMBLIES Model T-55 (RC -418) Model K-50 (RC -418A) MODEL T -55-S (Silver) Technical Information and Service Data: 33719 Belt-Tuning un

26、it push arm belt Model T -55-S is similar to Model T-55, ex - 33718 Board-Antenna-Ground terminal board cept for the following parts used in T -55-S: 12725 Capacitor -150 mmfd. (C12) Stock No. 12694 Capacitor -220 mmfd. (C14) 35180 Button-Push button 32599 Capacitor -430 mmfd. (C3) 35181 Escutcheon-

27、Dial escutcheon 12537 5107 Capacitor -560 mmfd. (C20) Model K50 Capacitor-.0025 mfd. (C13) 15179 Knob-Tuning or volume control knob 30303 33584 Capacitor-.0035 mfd. (C22) Model K50 Capacitor-.005 mfd. (C16) Model K50 MODEL T-56, RC -418 4937 Capacitor-.01 mfd. (C15, C16, C21) (C16 in Model T55 only)

28、 (C21 in Model K50 only) Technical Information and Service Data: 32787 Capacitor-.05 mfd. (C8) Model T-56 has the same chassis as T-55. 4839 Capacitor -0.1 mfd. (C9) For Service Data and replacement parts, 33775 Coil-Antenna coil (L9, L10) Model K50 refer to Model T-55, and these additional parts 33

29、724 Coil-Oscillator coil (L1) used in T-56: 32342 Condenser-Electrolytic, 2 sections 10 mfd. each (C17, C18) Stock No. 33630 Control-Tone control (S3) Model K50 X-834 Baffle-Baffle board and grille cloth. 32634 Cord-Drive cord 115393 Decalcomania Television 33633 Indicator-Dial scale pointer 35392 D

30、ecalcomania-RCA Victor 11765 Lamp-Dial lamp 33431 Link-Antenna terminal board link 33721 33727 Loop-Antenna loop Model T55 Plate-Dial plate assembly CHASSIS ASSEMBLIES 31388 Resistor -390 ohms, 1 watt (R8) (RC -497) 33489 Resistor -15,000 ohms, 2 watts (R2) 33719 Belt-Adjusting belt for push button

31、arms 12738 Resistor -27,000 ohms, watt (R10) Model 34724 Board-Antenna-Ground board 12454 1(50 Resistor -33,000 ohms, watt (R1) 33817 Capacitor-Mica trimmer comprising 1 section of 2to0 mmfd. C5) 12285 12679 Resistor -470,000 ohms, watt (R6, R7) Resistor -2.2 meg., watt (R3) mmfd. Capacitor -33 mmfd

32、. (C26) 13601 Resistor -10 meg., watt (R5) 310949 30949 Capacitor -56 mmfd. (C6, C7, C10, C11) 3372512723 Shaft-Tuning knob shaft Capacitor -56 mmfd. (C23) 31364 Socket-Dial lamp socket 12720 12694 Capacitor -100 mmfd. (C12, C24) Capacitor -220 mmfd. (C14) 14278 Socket-Phono-input socket female for

33、12537 Capacitor -560 mmfd. (C3) 5119 Socket -3 contact speaker cable- Model K50 30303 Capacitor-.0035 mfd. (C22) 31319 Socket-Tube socket 33584 4937 Capacitor-.005 mfd. (C13, C16, C27) Capacitor-.01 mfd. (C8, C15, C21) 33720 Spring-Pusharm return spring 4839 Capacitor -0.1 mfd. (C9) 33634 Switch-Rad

34、io-Phonoa switch (S2) 32240 Capacitor-Electrolytic comprising 2 sections of 33722 Transformer-First i -f transformer (L2, L3, C6, 10 mfd. and 1 section of 20 mfd. C7) 33724 Coil-Oscillator coil 33723 Transformer-Second i -f transformer (L4, L5, 33835 33630 Condenser -8 button tuning condenser Contro

35、l-Tone C10, C11 34796 control Control-Volume control and power switch 31575 Transformer-Power transformer 110-220 volts, 32634 Cord-Drive cord 60 cycle (T1) 33633 Indicator-Station selector indicator 33619 Transformer-Power transformer 105-120 volts, 11765 Lamp-Dial lamp 25-60 cycle (T1) 34795 Plate

36、-Dial plate complete less tuner and dial. - . 33112 Transformer-Power transformer 105-120 volts, 5119 Plug -3 contact female plug for speaker cable. 50-60 cycle (T1) 31388 Resistor -390 ohms, 1 watt (R8) 33631 Volume control and power switch (R4, S1) 33489 Resistor -15,000 ohms, 2 watt (R2) 33776 Mo

37、del T55 Volume control and power switch (R4, S1) 13998 Resistor -22,000 ohms, watt (R12) Model K50 12738 Resistor -27,000 ohms, watt (R10) 33726 Washer-C washer for tuning shaft 12454 12285 Resistor -33,000 ohms, watt (R1) Resistor -470,000 ohms, watt (R6, R7) SPEAKER ASSEMBLIES 12486 12679 Resistor

38、 -560,000 ohms, watt (R13) Resistor -2.2 megohms, watt (R11) (Model T55) 11868 Resistor -5.8 megohms, watt (R3) (RL -78-6) 13601 Resistor -10 megohms, watt (R5) 33735 Screw-Push button adjusting and locking screw 32907 Cap-Cone center dust cap 33725 Shaft-Drive shaft 32906 Coil-Hum neutralizing coil

39、 (L6) 34411 Shaft-Drive shaft - 33601 Coil-Speaker field coil (L8) 34723 Socket-Antenna loop socket 32904 Cone-Speaker cone and voice coil (L7) 31364 Socket-Dial lamp socket 32905 Transformer-Output transformer (T2) 14278 Socket-Phonograph input socket and jack 31319 Socket-Tube socket SPEAKER ASSEM

40、BLIES 31418 Spring-Driye cord spring (Model K50) 33720 Spring-Push button arm return spring (RL -70J-2) 33634 31575 Switch-Radio-Phono switch Transformer-Power transformer (100-120 and 31825 Cap-Cone center dust cap 200-240) volt 50-60 cycle 11469 Coil-Hum neutralizing coil (L6) 33112 Transformer-Po

41、wer transformer 105-125 volt, 33116 Coil-Speaker field coil (L8) 50-60 cycle 31275 Cone-Speaker cone and voice coil (L7) 33818 Transformer-Power transformer 110 volt, 25-60 5118 Plug -3 contact male for speaker cycle 33779 Transformer-Output transformer (T2) 32263 34719 Transformer -1st I.F. transfo

42、rmer Transformer -2nd I.F. transformer MISCELLANEOUS ASSEMBLIES 33726 Washer-C washer for drive shaft 33637 Bezel-Dial escutcheon MISCELLANEOUS ASSEMBLIES 33731 Button-Push button 33731 Button-Push button 33730 Clamp-Dial mounting clamp 31456 Cover-Protective cover for push button markers 31458 Cove

43、rs -8 -protective covers for push button 34801 Dial-Glass dial scale markers 33637 Escutcheon-Dial and push button escutcheon. 33729 Dial-Glass dial scale 30863 Knob-Tuning, tone control, or volume control 30863 .Knob-Tuning or volume control knob . knob 33973 Marker-Station selector marker 348013 L

44、oop-Antenna loop 30900 Spring-Knob or push button retaining spring. 33973 Marker-Station markers Additional Replacement Parts: 32641 Plug -3 prong male plug for antenna loop . . . Stock No. 30900 Spring-Retaining spring for knob Stock 30863 and Button, Stock 33731. 30585 Spring-Drive cord spring. 33735 Screw-Push-button lock sciew