RCA-Victor-Co-Inc-99T 电路原理图.pdf

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1、PAGE 644-C MODELS 98 K 99K and 99T Rating B Rating C POWER OUTPUT Undistorted Maximum 32231 8 . (Speaker RL -63-116) 31237 Clutch -Variable condenser drive gear clutch and pinion gear - engages pin on motor shaft Model 99T (50.60 cycle models only) 14356 Board -3 -contact reproducer terminal board.

2、31544 Clutch-Variable condenser drive gear clutch and 13866 Cap-Cone center dust cap pinion gear -engages pin on motor shaft (25 11234 Coil-Field coil (L12) cycle models only 11469 Coil-Hum neutralizing coil (L14) 31293 Coil -A band antenna coil (L5. L6, L7). 31310 Cone-Speaker cone and voice coil (

3、L13) 31296 Coil-A band oscillator coil (L17) 5039 Plug -4 -contact male plug for speaker 31294 Coil-B band antenna coil (L3, L4) 31309 Speaker-Complete 31295 Coil-B and C band oscillator coil (L15, L16) 14358 Screw-Screw, washer, and jockwasher to hold core in yoke 31297 Coil-C band antenna coil (L1

4、, L2) 14 34 Transformer-Output transformer (T2) 31290 Condenser -3 -gang variable condenser (C3, C4, C7, C8, C32) 14357 Washer-Spring washer to hold field coil SPEAKER ASSEMBLIES 31231 Contact-Contact tip for station -setting contact (Speaker RL -70-H2) 31269 Core-Adjustable core and stud for i -f t

5、rans- formers Model 99K 31260 Core -Adjustable core and stud for A band 13866 Cap-Dust cap for cone center oscillator coil 11234 Coil-Field coil (L12) 31273 Drum-Indicator drive cord drum 11469 Coil-Neutralizing coil (L14) 31240 Flywheel-Variable condenser drive motor fly- 31275 Cone-Speaker cone an

6、d voice coil (L13) wheel 5039 Plug -4 -contact male plug for speaker 31239 Gear-Variable condenser knob shaft drive gear 31530 Speaker-Complete and hub 14534 Transformer-Output transformer (T2) 31238 31545 11891 Gear-Variable condenser intermediate drive gear and pinion gear (5060 cycle models only)

7、. Gear-Variable condenser intermediate drive gear and pinion gear (25 cycle models only) Lamp-Dial lamp 14357 Washer-Spring washer to hold field coil securely SPEAKER ASSEMBLIES (Speaker RL -70-E2) Model 99K 31480 Lamp -Electric tuning adjustment indicator lamp 13866 Cap-Dust cap for cone center 312

8、43 Leather-Friction leather for flywheel 11234 Coil-Field coil (L12) 31246 Motor-Variable condenser drive motor (M1)- 11469 Coil-Neutralizing coil (L14) 25 cycle models only 12667 Cone-Speaker cone and voice coil (L13) 31235 Motor-Variable condenser drive motor (M1)- 5039 Plug -4 -contact male plug

9、for speaker 50/60 cycle models only 14535 Speaker-Complete 31228 Plate-Station-setting contact plate-less contacts 14358 Screw-Screws, washers, and lockwashers to hold 31227 Plate-Station-setting contact mounting plate- core in yoke mounts on rear of variable condenser 14534 Transformer-Output trans

10、former (T2) 5040 Plug -4 -contact female plug for speaker cable. 14357 Washer-Spring washer to hold field coil 1271 Pulley-Motor pulley -.1272 Pulley-Range switch pulley MISCELLANEOUS ASSEMBLIES .1250 Resistor-Voltage divider comprising one 1,500 ohm, one 2,950 ohm, one 3,400 ohm, one 12 ohm, and on

11、e 180 ohm sections (R19, R28, R31, R32, R33) 31303 31276 Bracket-Band indicator mounting bracket corn - plete less indicator strip, cord, and tension spring-Model 99K Bracket-Band indicator mounting bracket corn - 14284 Resistor -22.000 ohms, 1/10 watt (R24) plete less indicator strip, cord, and ten

12、sion 13998 Resistor -22,000 ohms, I. watt (R4) spring-Model 99T 11300 Resistor -33,000 ohms, 1/10 watt (R27, R30) 31282 Bracket-Magic Eye mounting bracket and holder 12454 Resistor -33,000 ohms, watt (R6) 31358 Button-Station selector push button 11281 Resistor -100,000 ohms, 1/10 watt (R34). 31345

13、Contact-Push button switch contacts-compris- 14560 Resistor -100,000 ohms, watt (-R35) ing 10 contacts riveted on insulating stnp. 11398 Resistor -220,000 ohms, 1/10 watt (R14, R36) 31344 Contact-Push button switch contacts-compris- 12264 Resistor -220,000 ohms, watt (R5) ing 13 contacts riveted on

14、insulating strip. 11453 Resistor -270,000 ohms, 1/10 watt (R16, R29) 31278 Cord-Band indicator drive cord 11452 Resistor -470,000 ohms, 1/10 watt (R1) 31281 Cord-Indicator pointer drive cord 12285 Resistor -470,000 ohms, watt (R8) 31283 Cord-Variable condenser drum drive cord. 12013 Resistor -1 meg.

15、, 1/10 watt (R7, R26) 31456 Cover -8 protective covers for push button 31056 Resistor -1.2 meg., 1/10 waft (R22) markers 5131 Resistor -2.2 meg., 1/10 watt (R3) 31359 Cushion-Station selector push button rubber 31233 Rotor-Selector rotor disc-mounts on rear of cushion variable condenser shaft 31451

16、Dial-Station selector dial scale and crystal. 31241 Screw- x 20 headless ccne point set screw for flywheel 31356 Escutcheon-Station selector dial escutcheon- less dial scale and push buttons-Model 99K 4119 Screw-No. 8-32 headless set screw for gear Stock No. 31239 31361 Escutcheon-Station selector d

17、ial escutcheon- less dial scale and push buttons-Model 99T 14350 Screw-No. 8-32 square head set screw for 31304 Indicator-Band indicator strip selector rotor disc 31305 Indicator-Station selector indicator pointer. 4669 Screw-No. 8-32 square head set screw for pulley Stock Nos. 31271 and 31272, and

18、drum 31355 Knob-Range switch, volume control, tone con - trol, or station selector knob Stock No. 31273 31346 Lock-Push button switch lck plate-compris- 31364 Socket-Dial lamp socket ing 10 contact locks in one strip 13871 Socket-Magic Eye socket 31589 Markers-Station call letter markers for push 31

19、251 Socket-Radiotron socket buttons 31365 Socket-Tuning indicator lamp insulated socket 31457 Marker-Record Player marker for push 31232 Spring-Contact tip spring for station - setting button contact 31458 Marker-Dial Tuning marker for push button 12007 Spring-Retaining spring for core Stock No. 312

20、80 Pulley-Indicator pointer drive cord pulley. 31269 14887 Retainer-Indicator pointer drive cord pulley re - 31262 Spring-Tension spring for core Stock No. 31260 tainer 31230 Spring-Station-setting contact body spring. 31242 Spring-Tension spring for flywheel 31236 Support-Variable condenser drive g

21、ear mount- ing support and studs assembly 11210 Screw-Chassis mounting screws, washers, and lockwashers for one chassis 31244 Support-Variable condenser motor mounting support and studs for 50/60 cycle models only 3993 Screw-No. 6-32 square head set screw for pointer slide stop 31245 Support-Variabl

22、e condenser motor mounting 31287 Shaft-Indicator pointer slide shaft support and studs-for 25 cycle models. 31347 Socket-Pickup socket and bracket 31291 Switch-Range switch (Si, S2) 31279 Spring-Band indicator tension spring 31248 Tone Control-H.f. tone control and power switch (R12, S4) 13638 Sprin

23、g-Indicator pointer drive cord tension spring 31287 Transformer-First i -f transformer (L8, L9, C11, C12) 31418 Spring-Variable condenser drum drive -cord ten - sion spring 31268 Transformer-Second i -f transformer (L10, L11, C13, C14) 14270 Spring-Retaining spring for knob Stock No. 31355 31308 Tra

24、nsformer-Power transformer 105-130, 140- 160, 200-250 volts, 50-60 cycle (Ti) 31970 Spring-Tension spring for push button switch latch bar 31226 Transformer-Power transformer 110 volts, 25- 31307 Stop-Indicator pointer slide stop 60 cycle (T1) 31225 Transformer-Power transformer 110 volts, 50- 60 cy

25、cle (T1) 31360 Switch-Pickup switch for mounting on push 31450 Volume Control (R9) button switch assembly (S31 PAGE 84o -C Electric Tuning Mechanism MODELS HF -2, HF -4, HF -6, HF -8, 1104, 110K, 110U, U-30, U-116 98K, 99T, 99K, U-126, U-128, U - I 29, K- I 30 U-130, U-132, U-134, 910KG, 911K LUBRIC

26、ATE GEARS WITH PETROLEUM JELLY. USE LIGHT MACHINE OIL ON GEAR BEARINGS DRIVE GEAR MOUNTING Y STUD ASSEMBSEMB LY,. 31236 GEAR -MESH ADJUSTMENT STUDS (SET FOR MINIMUM BACK -LASH AND FREEDOM FROM BINDING BY ROTATING STUDS) DRIVE GEAR CLUTCH AND PINION GEAR 31237 (50/6OCYCLES) MOTOR MOUNTING SUPPORT AND

27、 STUDS ROTOR SPRING HORIZ MOUNTED MOTORS ONLY ROTOR IS PULLED FORWARD WHEN MOTOR 15 ENERGIZED AND THE ENGAGING ARM ENGAGES WITH CLUTCH. FLYWHEEL 31240 WASHERS ENGAGING MOTOR SHAFTU ARM AND PINION SHAFT MUST BE IN LINE FRICTION ADJUSTING SCREW 31241 SEAL WITH HOUSEHOLD CEMENT. 31491 BRACKET ,- LOCK I

28、N PLACE WITH NUT. MOTORS ONLY THEN BACK UP SCREW /2 TURN AND Ix I Ir I KNOB SHAFT 31681 KNOB SHAFT PULLEY. 31271 CONDENSER DRUM DRIVE CORD, 31283 KNOB -SHAFT DRIVE GEA9. /AND HUB, 31239 INTERMEDIATE DRIVE GEAR AND PINION 31238 (50/60 CYCLES) .010 PLAY BRASS WASHER WASHER SPRING 31493 Motor and Gear

29、Mechanism There must be 1/32 -inch clearance between the end of the engaging arm and the face of the intermediate gear when the- motor is in its full forward position. Oscillation of Tuning Mechahism The principal of operation necessitates that the mechanism go through several quick reversals on arr

30、iving at the desired station frequency and before reaching a dead stop. Three of four reversals are normal. The number of reversals and consistency of operation depends mainly on the flywheel friction adjustment, however, in some cases the selector disc and station setting contacts are involved. The

31、 following suggestions may be helpful where excessive pointer oscilla- tion is experienced. Oscillation on Certain Buttons Only (1) Check contact tip of selector assembly for loose fit in body. See that nose of contact is not burned nor distorted out of correct shape. Replace tip if neces- sary; do

32、not attempt to file the tips. (2) Clean the insulating gap of selector disc, being sure to remove all metal particles and metallic fragments (3) LUBRICATE KNOB SHAFT BEARINGS WITH PETROLEUM JELLY USE LIGHT MACHINE OIL AT MOTOR BEARINGS hen a station button is pushed in, it completes the 24 -volt cir

33、cuit through the corresponding station -setting contact and one-half of the brass selector disc, which is connected to one side of the motor field coil. This energizes the motor, and the rotor is pulled forward, engaging with the gear train that drives the tuning condenser and selector disc. The con

34、denser and disc rotate until the insulation line comes under the particular station -setting contact, and the motor circuit is broken. When the electric tuning mechanism is in action, the motor -supply voltage is fed into a diode rectifier circuit which applies a high bias to the first -audio amplif

35、ier. This prevents audio amplification and makes the set quiet or mute while the mechanism is operating. The brass selector disc is fastened to the rear shaft of the tuning condenser by means of two set -screws. When the condenser is at maximum (plates fully meshed) the in- sulation line should be h

36、orizontal, with the operating -end at the left (viewed from rear). The operating -end has dark insulating ma terial and the brass is beveled at this end. The selector disc should be set so that the contact -tip plungers in the station -setting contacts project not more than 1/16 -in. from the body o

37、f the contacts. Lubrication Motor bearings and gear bearings; use light machine oil. Gear faces; use Pure Oil No. 611 or petroleum jelly. Dial -indicator pulleys and rails; use Castordag or petroleum jelly. Selector disc; apply thin film of petro- leum jelly. from beveled edges of the brass. tach co

38、ntact should be checked to assure that clearance exists (approx. .010in) between it and the disc when stopped in position on the station. Inspect the insulating gap to see that it has not changed shape due to bending or warping. Replace the disc if cleaning and adjustment fail to give correct operat

39、ion. Oscillation On All Buttons Slow oscillation indicates friction adjustment of fly- wheel is too tight. Loosen set screw in flywheel slightly. (2) Rapid oscillation indicates friction adjustment is too loose. Tighten set screw in flywheel slightly. (3) If definite adjustment cannot be reached, re

40、move (1) RCA VICTOR DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. A. spring from behind flywheel set screw and increase its length by stretching; replace and make the neces- sary adjustments. Install a new spring if necessary. (4) See that leather friction pad is not binding in its h

41、ole, and that it is saturated with lubricant. Neats-Foot oil should be used for this purpose. Incorrect balance of the flywheel sometimes prevents correct adjustment. The standard service replacement flywheel Stock No. 31240 may be used to definitely eliminate this cause. (6) The number of oscillati

42、ons varies somewhat with line voltage. Stability of adjustment is slightly better if made after a brief run-in period. (5) (7) Adjustment of Selector Disc The brass selector disc is fastened to the rear shaft of the KNOB SHAFT PULLEY, 31271 CONDENSER DRUM DRIVE CORD, 31283 KNOB -SHAFT DRIVE GEAR AND

43、 HUB, 31239 INTERMEDIATE DRIVE GEAR ANO PINION 31238 (50/60 CYCLES) 31545 (25 CYCLES) LUBRICATE KNOB SHAFT BEARINGS WITH PETROLEUM JELLY ROTOR SPRING HF -6, HF -8 ONLY MOTOR 31235(50/60 CYCLES) 1131246(25 CYCLES) 512 PAGE 814-C ELECTRIC TUNING tuning condenser by means of two set -screws. When the c

44、ondenser is at maximum (plates fully meshed) the insula- tion line should be horizontal, with the beveled operating - end at the left (viewed from rear). The selector disc should be set so that the contact -tip plungers in the station -setting contacts project not more than 1/16 -in. from the body o

45、f the contacts. Adjustments To adjust S12, loosen knob shaft pulley, and adjust it so that when shaft is pushed all the way in, the ends of the leaves of S12 will be deflected 1/32 -inch from their original position. When tuning shaft is released, distance between contacts of S12 should be 1/32 -inc

46、h. S7 should be adjusted so that when motor is in its full forward or upward position, the ends of the leaves should be deflected 1/32 -inch- from their original position. GEAR -MESH ADJUSTMENT STUDS (SET FOR MINIMUM BACK -LASH AND FREEDOM FROM BINDING BY ROTATING STUDS) ! 11 -. C WAS NCR111 ENGAGIN

47、G ARM i LUBRICATE GEARS WITH PETROLEUM JELLY. USE LIGHT MACHINE OIL ON GEAR BEARINGS DRIVE GEAR MOUNTJNG SUPPORT ANO STUD ASSEMBLY, 31680 -DRIVE GEAR CLUTCH AND PINION GEAR 31237 50/60 CYCLES) 31544 (25 CYCLES) req._ Armchair Control Unit Station -Setting Contacts and Selector Disc This illustration

48、 shows connections for a G8A Armchair Control Unit. This unit is not sup- plied with the receiver but may be added as an accessory. Station Button Color of Lead To Station -Setting Contact No. 1 Black No. 2 Brown No. 3 Blue No. 4 Green No. 5 Red No. 6 Red -black No. 7 Brown -black No. 8 Red -yellow STATION - SETTING CONTACTS BRASS SELECTOR DISC n ra MOTOR SHAFT AND PINION SHAFT MUST 8E IN LINE A.F. C. SHORT ING VV. (57) -MOTOR MOUNTING SUPPORT AND STUDS 31678 (50/60 CYCL ES) 31 67 9 (25 CYCLES) USE LIGHT MACH