RCA-Victor-Co-Inc-98T 电路原理图.pdf

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1、MANUAL OF 1939 MOST POPULAR SERVICE DIAGRAMS MODELS 98T and 98K2 fShTr Chaiiii No. RC-386A and RC-386A DUMMY /TERM. CATHODE. CURRENTS J0O4MIV S. . . as Mft. LKT *. 4K65 . tS MR. 3. a97-o o4M 7. sue. 4. *J5. .0.74M. TOTHL RBCTIIiaO CUBBtHT 74.0 MR. TAPV- VOL. CONTR. TONE CONTR.-Rt3 ZI.FTRANS. rJn 0*O

2、LtORRPH COMnfCTMiVlnCRL*t lJ nTifM.vomcRi.o“To cwMSis. a IMV. RESISTOR Sy J ASSEMBLY PRI.A0J.| jp, 1ST i.f.tRANS. eA8-G 1T DET. 98K2, 12 inches Voice Coil Impedance 2 2 ohms at 400 cycles PHONOGRAPH U-25, U-26 Type RP -132 Automatic Record Capacity Eight 10 -inch or seven 12 -inch Turntable Speed 78

3、 r.p.m. adjustable PICKUP Type Crystal Impedance 100,000 ohms at 1,000 cycles Average Output 1.5 volts at 1,000 cycles across 500,000 ohm load Location of Controls The left-hand push button is a Victrola-Attachment switch. The right-hand push button is for dial tuning. REFER TO INDEX FOR DATA ON AUT

4、OMATIC RECORD CHANGER DRUM 31372 INOICRTOR DRIVE CORD PULLEY SPEAKER PLUG LINK KNOB BHRPr PULLCY I 4 REO - RED -BLACK RED SOCKET Model 98T BROW N BROWN BROWN REV- BLACK BLACK BL AC K FIELD BLACK -BROW N N-581 TO 51,3-G FIL. TO C18 TO 6K6 -G PLATE TO 6K6 -G PLATE TO 6K6 -G SCREEN DRUM SHOWN WITH CRNG

5、 RT MRXIMUM CRPRCITY SPEAKER PLUG CONNECTIONS 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 41.0-C U-25, U-26, 96K2, 98T Alignment Procedure Cathode -Ray Alignment is the preferable method. Connections for the oscillograph are shown in the c

6、hassis drawing. Output Meter Alignment. -If this method is used, connect the meter across the voice coil, and turn the receiver volume control to maximum. Test -Oscillator. -For all alignment operations, connect the low side of the test -oscillator to the receiver chassis, and keep the output as low

7、 as possible to avoid a -v -c action. Calibration Scale on Indicator -Drive -Cord Drum -The tuning dial is fastened in the cabinet and cannot be used for reference during alignment; therefore, a calibration scale is attached to the rear of the drum which is mounted on the front shaft of the gang con

8、denser. The setting of the gang co:denser is read on this scale, which is calibrated in degrees. The correct setting of the gang in degrees, for each alignment frequency, is given in the alignment table. As the first step in r -f alignment, check the position of the drum. The 180 mark on the drum sc

9、ale must be vertical, and directly over the center of the gang -condenser shaft when the plates are fully meshed. The distance from the front of the chassis to the drum must not exceed i -inch. The drum is held to the shaft by means of two set screws, which must be tightened securely when the drum i

10、s in the correct position. Pointer for Calibration Scale. -Improvise a pointer for the cali- bration scale by fastening a piece of wire to the gang -condenser frame, and bend the wire so that it points to the 180 mark on the cali- bration scale when the plates are fully meshed. Connect the high side

11、 of test -ose. to- Tune test- osc. to- Turn radio- dial to- Adj us ngt the fol - oow win fut peak output 1 6K7 I -F grid cap,L12 series wit .01 d. 455 kc Amod+ Quiet Point between 550-750 kc and L13 2nd 1-F Transformer) 2 8A8G det. grid cap, in series with .01 mfd. 455 kc L10 and L11 (1st I -F Trans

12、former) 3 Antenna Terminal, in series with 200 mmf. 800 kc 800 kc (150.5) A band L9 4 1,500 kc 1,500 kc (28) A band C25 (osc.) C30 (ant.) 5 Repeat steps 3 and 4. 6 Antenna Terminal, in series with 400 ohms. 6 me 8 me (28.5) B band C23 (ac.) 7 20 me 20 me (22) C band C21 (oac.) 8 Follow Adjustments f

13、or Electric Tuning. *Use minimum capacity peak if two peaks can be obtained, and rock gang condenser slightly while adjusting C23 and C21. Note. -Oscillator tracks 455 kc above signal on all bands. Dial -Indicator Adjustment. -After fastening the chassis in the cabinet, move the dial indicator on th

14、e drive cable to the left-hand end mark on dial, with gang condenser fully meshed. For additional details, refer to booklet RCA Victor Receiver Alignment. /15OOKG SN -916 -RC 3866 - C29 ANT ue 05C. C30 LI L13 TUNING scC. ADJ . INDICATOR 45614C 44111NC 2 1TDET.o 4r r r 0 NO a2 W F 1- II N8 Um IN,I Q

15、r -O an O O o mo z mf C2. U, 41 U Q aFN 0 o o e m 7 2 Q o O W W a g4 a m N 4 m .ge rVo3 u m a FJ z - 3 sr, a$ 3 -II- VF N re c N VI I CC, r W/ F a PAGE 442-C U-25, U-26, 98k2, 98T POWER SW TONE CONTR.-R13 DUMMY TERM. VOL. CONTR. R6 CATHODE CURRENTS 6A66 1004501 S. 61465 33 MA. LOKT 920MA i 6156G CIM

16、E. 3.657G 641 MA 7 SUS 1.9 MA 4. i5 0.74 MA. TOTAL AECTIFICO BCUROEMT-74.0 MA. 7 29I.F.TRANS. 0 Q LI2 I.AO vRJ. TERM. BRD. O 43SKC. 09441L02101F1100N11RT10N.VeRKlllAITO TMSTBM.VQ11C111-0TO CIIMMS. 1B6V RESISTOR E _ ASSEMBLY 120 v. tUv 2144.- 2219 TA 6Q7 -G 21p OET.,A V C. & 16T A. F 6J 5 PHASE INVER

17、TER Mix -11.41, CABLE TO MI/MO TUB! 6K6 -G OUTPUT 541 544 -I C9 ,545 21V BLU E 79V. 6K7 I. F. PRI.ADJ. Q 4551v_T_- IST I. F. TRANS. 1536 O5C COILS L3 ANT. TRIMMERS C36 1-43- 0 m 0 6K6 -G Tr OUTPUT yl -23.3v. 6 _ 6 223v. C4 GREEN GAS -G IST DET.& OSC. 76Y - 79V P e TO ELECT. 1.7V. TUNING LAMP BLACK 6

18、 $37 V C20 536 STATION SELECTOR SWITCH 535 38 W 0: 534 SUL !: 533 rSAIL 2 W 532 rsa2l 2 C35 C34 C33 C32 31 ELECT. CAP. 10142044T5 V. CEO M MfD.4SOV. 11202I1ME COMO- 25v.MEWS 2 W u z 1 a 155 531 Is -se : Y 55 C LI L2 1 ,RED-CIB GREEN -CAA / /RED-WMITE TR7CI9 Jr BLACK-COMMON J/ GREEN TO 6A8- GRID RED

19、TO REAR SECTION OF GANG -COB BLACK ANT. COIL 46 POWER TRANSF. TI VICTROLA JACK ALL MERTEE5 6.SV.AC. EXCEPT 5Y3 -G 5.0V. AC. BOTTOM VIEW- REAR OF CHASSIS R -F Wiring Diagram and Socket Voltages Measurements made to chassis unless otherwise indicated, with set tuned to quiet point and volume control a

20、t minimum. Values should hold within 20% with 117 -volt a -c supply. U RANGE SWITCH 61 J TO ANT. BOARD D C21 I a O J BLUE 5V AC. 5Y3c RECT. OM. .TE-STUeZli SN. 959 s NOTE: Values with star (*) are operating voltages in circuits with high series resistance. The actual measured volt- ages will be lowe

21、r, depending on the voltmeter loading. Replacement Parts MODELS 98 K2 & 98 T Insist on genuine Factory -tested parts, which are readily identified and may be purchased horn authorized dealers. STOCK No. DESCRIPTION STOCK No. DESCRIPTION CHASSIS ASSEMBLIES (RC -38 8-A ) MODELS 98X2 AND 98T Same as Mo

22、dels U-25 and U-26 EXCEPT 30766 Cap - Rubber cap for Magic Eye 30406 Capacitor - 100 mmfd (C39) 32666 Control - Volume control, tone control and power switch (R6, R13, S3) 32670 Plate - Dial color plate. 32871 Shaft - Tuning drive shaft and pulley. 31199 Shield - Dial lamp shield. 31385 Socket - Ins

23、ulated socket for electric tun- ing indicator lamp. 32869 Switch - Range switch (Si, S2) C13, C15e R9, R10, R11, Rah not used InModels 981(2 and 98T. 13886 12012 11489 31275 31539 32146 14534 14357 32689 32888 31539 32687 32890 31397 31456 32673 32674 31355 31391 14359 30773 31458 31457 31589 30330

24、4982 14270 SPEAKER ASSEMBLIES (RL -70H-5) MODEL 98142 Cap-Dust cap for cone center Coil-Field coil (L16) Coil-Neutralizing coil (L15) Cone-Speaker cone and voice coil (114) Plug -5 -contact male plug for speaker Speaker complete Transformer-Output transformer (T2) Washer-Spring washer to hold field

25、coil se- curely SPEAKER ASSEMBLIES (84308-3) MODEL 98T Coil-Speaker field coil (L16) Cone-Cone and voice coil mounted and centered on housing (L14) Plug-S-contact plug or speaker Speaker-Speaker complete Transformer-Output transformer (T2) MISCELLANEOUS ASSEMBLIES Button-Station selector push button

26、 Covers -8 Potective covers for push button markers Dial-Station selector glass dial Escutcheon-Station selector escutcheon - less push buttons Knob-Range switch knob Knob-Tone control knob Knob-Tuning knob Knob-Volume control knob Marker-Dial Tuning push button marker Marker-Record Player push butt

27、on marker Marker-Station markers Spring for tone control knob Spring for tuning knob Spring for volume control or range switch knob o PAGE 413-C U-25, U-26, 98K2, 981 Insist REPLACEMENT PARTS MODELS U25 & U26 on genuine Factory -tested parts, which are readily indentified and may be purchased from a

28、uthorized dealers. STIOoCK DESCRIPTION STOCK DESCRIPTION ASSEMBLIES 31251 Socket -Tube socket (RC -386-B) 31418 Spring -Indicator or drum drive cord tension 14517 Board-Antennaground terminal board 324b1 spring Switch -Range switch (S1, S2) 30752 Bracket -Magic Eye mounting bracket 32498 Switch -Sta

29、tion selector push-button switch and 31400 Capacitor -Triple adjustable trimmer, two sec- tions 2-10 mmfd., one section 3-30 mmfd. (C21, C23, C25) Radio -Record switch (S4, S5, S31, S32, S33, S34, S35, S36, S37, S38, 539, S40, S41, S42, S43, S44, S45) 32486 Capacitor -Antenna coil trimmer capacitor

30、bank 20-470 mmfd. (C31, C32, C33, C34, C35, C36) 14376 14283 Transformer -First i -f transformer (L10, L11, C5, C6) Transformer -Second i -f transformer (L12, L13, 12722 Capacitor -18 mmfd. (C1) C7. C8, C37, R4. R5) 13141 Capacitor -47 mmfd. (C13) 12723 Capacitor -56 mmfd. (C3, C46) 31445 Transforme

31、r -Power transformer 105-125 volts, 25-60 cycles (T1) 12720 Capacitor -100 mmfd. (C39) 31446 Transformer -.-Power transformer 100-130/140- 14262 12404 Capacitor -109 mmfd. (C5, C6) Capacitor -120 mmfd. (C7, C8) 32144 160/200-250 volts, 50-60 cycles (Ti) Transformer -Power transformer 105-125 13003 1

32、4712 Capacitor -180 mmfd. (C37) Capacitor -180 mmfd. (C2) volts, 50-60 cycles (T1) 32492 Capacitor -530 mmfd. (C24) 31435 Capacitor -750 mmfd. (C26) SPEAKER ASSEMBLIES 4881 Capacitor -3,300 mmfd. (C22) (RL -70H-5) 31405 Capacitor -6,000 mmfd. (C27) 5107 Capacitor -.0025 mfd. (C16) 13866 Cap -Dust ca

33、p for cone center 4838 Capacitor -.005 mfd. (C14, C17, C43) 12012 Coil -Field coil (L16) 4858 Capacitor -.01 mfd. (C10, C40, C41, C42). 11469 Coil -Neutralizing coil (L15) 14393 Capacitor -.01 mfd. (C11, C15) 31275 Cone -Speaker cone and voice coil (L14) 30882 Capacitor=,05 mfd. (C4, C9, C38) 31539

34、Plug -5 -contact male plug for speaker 30867 Capacitor -0.5 mfd. (C20) 32146 Speaker complete 32146 Capacitor -4 mfd. (C12) 14534 Transformer -Output transformer (T2) 32142 Capacitor -Comprising two 10 mfd., one 20 mfd. sections (C18, C19, C44) 14357 Washer -Spring washer to hold field coil securely

35、 MISCELLANEOUS ASSEMBLIES 31382 32493 Clip -Oscillator coil and core mounting slip coil -A, B, and bands (Ll, Coil-AntennaC 12038 Band -Rubber band for Magic Eye L2, LS, L43) 31397 Button -Station selector push-button 31951 Coil -Oscillator coil -A, B, and C bands (L4, 13103 Cap -Pilot light jewel L

36、5, L7, L9) 31456 Cover -8 protective covers for push-button 31383 Coil -Oscillator coil -A band (L41, L42) markers 32487 Coil -Oscillator coil-. A band (L39, L40). 31541 Cushion -Motor plate mounting cushions and 31385 Coil -Oscillator coil -A band (L37, L38) . clamps sufficient for one instrument 3

37、1369 Condenser -2 -gang variable tuning condenser 32495 Dial -Glass dial scale (Model U25 only) (C28, C29, C30) 32494 Dial -Glass dial scale (Model U26 only) 31366 Control -Volume control, tone control, and on- off switch (R6, R13, S3) 31407 Escutcheon -Magic Eye or Electric Tuning indi - cator escu

38、tcheon 32635 Cord -Indicator pointer drive cord 31395 Escutcheon -Tuning dial escutcheon only, less 32634 Cord -Variable condenser drum drive cord push -buttons and dial scale 30905 Core -Adjustable core and stud for i -f transformer 30698 Hinge -Lid hinge complete with screws 31388 Core -Adjustable

39、 core and stud for oscillator coil, Stock Nos. 31383, 32487, and 31385. 4585 Hinge -One upper and one lower door hinge (Model U26 only) 12800 Core -Adjustable core for oscillator coil, Stock 31564 Holder -Needle card holder No. 31951 31543 Indicator -Electric tuning indicator disc 31372 Drum-Variaoi

40、e condenser drive cord drum and 31392 Indicator -Indicator pointer, carriage and clip calibration dial 31355 Knob -Range switch knob 11891 Lamp -Phono. compartment lamp 14359 Knob -Station selector knob 31480 Lamp -Dial and Electric Tuning lamp 31391 Knob -Tone control knob 30868 Plug -2 -contact fe

41、male plug for motor cable. 30773 Knob -Volume control knob 5040 Plug -4 -contact female plug for speaker cable. 31460 Marker -Dial Tuning push-button marker 31373 Pulley -Drive cord pulley (Model U25 only) 32143 Resistor -Voltage divider comprising one 11,000 ohm, one 3,000 ohm, bite 22 ohm, and one

42、 31458 Marker -Dial Tuning push-button marker (Model U26 only) 270 ohm sections (R14, R22, R23, R24). 31459 Marker-Victrola push-button marker (Model 30545 Resistor -180 ohms, 4.watt (R8) U25 only) 5114 Resistor -15,000 ohms, 1 watt (R17) 31457 Marker-Victrola push-button marker (Model 14289 Resisto

43、r -22,000 ohms, 1/10 watt (R4) U26 only) 12454 Resistor -33,000 ohms, 4 watt (R2, R12) 31590 Markers -1 set station call letter markers (Model 12266 Resistor -39,000 ohms, watt (R7) U25 only) 14560 Resistor -100,000 ohms, watt (R25) 31589 Markers -1 set station call letter markers (Model 11398 Resis

44、tor -220,000 ohms, 1/10 watt (R5) U26 only) 12199 Resistor -270,000 ohms, watt (R15, R19). 11210 Screw -Chassis mounting, screws, washers, and 14983 Resistor -330,000 ohms, watt (R9) lockwashers 13479 Resistor -390,000 ohms, * watt (R20, R21). 31393 Screen -Dial color screen 12486 Resistor -560,000

45、ohms, watt (R18) 32870 Screen -Phono. compartment lamp screen 30963 Resistor -820,000 ohms, watt (R11) 33083 Spring -Actuating spring for lid support (Model 12013 Resistor -1 meg.,.1/10 watt (R18) U26 only) 13730 Resistor -1 meg., 4 watt (Rl, R28) 30330 Spring -Retaining spring for knob, Stock No. 3

46、0208 Resistor -1.2 meg., watt (R10) 31391 12679 Resistor -2.2 meg., watt (R3) 14270 Spring -Retaining spring for knob, Stock Nos. 14343 Retainer -Retaining spring for station selector 30773 and 31355 knob shaft 4982 Spring -Retaining spring for knob, Stock No. 14887 Retainer -Drive cord pulley retai

47、ner 14359 4669 Screw -No. 8-32 square head set screw for drum, Stock No. 31372 31470 Spring-Motorboard suspension top spring, bot - tom spring, screw, and lockwasher (4 reqd) 31368 Shaft -Station selector knob shaft and pulley 33081 Support -Right-hand lid support (Model U28 3682 Shield -Tube shield

48、 only) 30868 Socket -2 -contact female socket for motor power cable 33082 Support -Left-hand lid support (Model U26 only) 12493 Sodket-5-contact female socket for speaker cable 31478 Support -Lid support (Model U25) 13871 Socket -Magic Eye socket 14278 Socket -Pickup input socket FOR RECORD CHANGER REPLACE- MENT P