RCA-Victor-Co-Inc-911K 电路原理图.pdf

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1、PAGE 804-C MODEL 911K Eleven -Tube, Five -Band, Electric -Tuning, A -C, Superheterodyne Receiver Antenna Connections RCA Victor Master Antenna Kit.-Connect the twisted - pair transmission line to terminals Al and A2 on the terminal board at rear of chassis. Connect the counter -poise to A3. Terminal

2、 G may be connected to ground, but this connection is not necessaryfor correct operation. Noise -Reducing Adjustment.-After the RCA Victor Mas- ter Antenna Kit is connected to the receiver, tune the re- ceiver to a point near 900 kc where no station is heard. Turn volume control clockwise until nois

3、e is heard. If no noise of a regular character is audible, start any brush -type motor - driven appliance, such as a vacuum cleaner, electric razor, refrigerator, etc., but do not bring it too near the receiver. This will generate noise as a continuous crackling, or buzz. Adjust Cl to a point where

4、this noise is reduced to a mini- mum. Adjustment of the noise reducing trimmer Cl should be made in the customers home, with the RCA Victor Master Antenna connected to the receiver. This adjustment is effective only when the RCA Victor Master Antenna is used. For all other types of antenna, the nois

5、e -adjustment trimmer should be screwed all the way down. Other Antennas.-Use terminals Al and A3 on the re- cei zr terminal board as antenna and ground connecting points respectively. Terminal A3 may be connected to ter- minal G, unless this causes interference, in which case this connection should

6、 be omitted. Electrical Specifications FREQUENCY RANGES R -F ALIGNMENT FREQUENCIES Standard Broadcast (A) 540.1,720 kc Standard Broadcast (A) 1,500 kc (osc., det., ant.), 49 Meter Band 5,920-6,230 kc 600 kc (osc.) 31 Meter Band 9,480-9,690 kc 49 Meter Band 6,100 kc (osc.) 25 Meter Band 11,680.11,940

7、 kc 31 Meter Band 9,600 kc (osc., det., ant.) 25 Meter Band 11,800 kc (osc.) 19 Meter Band 15,080-15,390 kc 19 Meter Band 15,200 kc (osc.) Intermediate Frequency 455 kc RCA TUBE COMPLEMENT (1) RCA -6K7 R -F Amplifier ( 2 ) RCA -4A8 First Detector ( 3 ) RCA -6J7 Heterodyne Oscillator (4) RCA -6K7 I -

8、F Amplifier (5) RCA -6H6 Second Det., A.V.C., and Muting (6) RCA -6F5 Audio Voltage Amplifier Pilot Lamps One Mazda 47, 6-8 volts, .15 amp; Two Mazda 44, 6.3 volts, .25 amp. POWER SUPPLY RATINGS Rating A Rating B Rating C POWER OUTPUT Undistorted 10 watts Maximum 12 watts INDICATOR DRIVE CORD 31281

9、PULLEY 31280 SPRING 13638 DRUM 31273 IN REAR ROOVE OF DRUM SPRING 31418 g START (7 ) RCA -6F5 A -F ,Amp. and Audio Phase Inverter (8) RCA -6F6 Power Output (9 ) RCA -6F6 Power Output (10) RCA -6U5 Magic Eye Tuning Tube (11) RCA -5T4 Full -Wave Rectifier 105-125 volts, 50-60 cycles, 120 watts 105-125

10、 volts, 25.30 cycles, 120 watts 105.125/140.160/195.250 volts, 50-60 cycles, 120 watts LOUDSPEAKER Type 12 -inch Electrodynamic Voice Coil Impedance 2.2 ohms at 400 cycles REFER TO INDEX FOR DATA ON ELECTRIC TUNING SPRING 31279 TUNING KNOB SHAFT PULLEY 31271 9N-823-1 3 TURNS (TUNING CONDENSER IN FUL

11、L CONDENSER DRUM DRIVE CORD 31263 (IN FRONT GROOVE OF DRUM.) MESH POSITION) INDICATOR- -31277 STRIP CORD 31278 BAND -SWITCH SHAFT PULLEY 31272 BAND INDICATOR PRIVE coon REFER TO PAGE W44c FOR DATA ON MODI- FI ED I .F. TRANS. USED ON SOME PRODUC- TIONS. RCA VICTOR. DIVISION OF RADIO CORPORATION OF AM

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15、11K ALIGNMENT PROCEDURE Cathode -Ray Alignment is the preferable method. Connec- dons for the oscillograph are shown in the chassis 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

16、 all alignment operations, connect the low side of the test -oscillator to the receiver chassis, and keep the output as low as possible to avoid a -v -c action. Calibration Scale on Indicator -Drive -Cord Drum.-The tun- ing dial is fastened in the cabinet and cannot be used for ref- erence during al

17、ignment, therefore a calibration scale is at- tached to the rear of the indicator -drive -cord drum which is mounted on the front shaft of the gang condenser. The set- ting of the gang condenser is read on this scale, which is calibrated in degrees. The correct setting of the gang in de- grees, for

18、each alignment frequency, is given in the align- ment table. As the first step in r -f alignment, check the position of the drum. The 0 mark on the drum scale must be vertical, and directly over the center of the gang -condenser shaft when the plates are fully meshed. The drum is held to the shaft b

19、y means of two set screws, which must be tightened securely when the drum is in the correct position. To determine the corresponding frequency for any setting of the calibration scales, refer to the accompanying drawing which shows the dial with 0.180 calibration scales drawn at top and bottom. Poin

20、ter for Calibration Scale.-Improvise a pointer for the calibration scale by fastening a piece of wire to the gang - condenser frame, and bend the wire so that it points to the 0* mark on the calibration scale when the plates are fully meshed. Dial -Indicator Adjustment.-After fastening the chassis i

21、n the cabinet, attach the dial indicator to the drive cable with indicator at the 530 kc mark, and gang condenser fully meshed. The indicator has a spring clip for attachment to the cable. Spread -Band Alignment.-The most satisfactory method of aligning or checking the spread -band ranges is on actu

22、al reception of short-wave stations of known frequency, by adjusting the magnetite -core oscillator coil for each band so that these stations come in at the correct points on the dial. 1_15 SEC ADJ 455 CC TUNING TUBE LIT SEC. ADJ. 455 K C CS- ANT 1500KC C4 -ANT. R.F. boo C AMP. CB-DET. T -_ 1500KC C

23、IO-DET. 9600 K= G39-0577 SOO KC 61(1 eft o C35 05C 2YDDET. GIOOKE 1,B00C L25OSC. L23-OSC. 600 KC 4600 KC o F 6)(7 cze OUTPUT 6F5 6F5 TI As AR Al G CAUTION, THIS ADJ. SCREW MUST PROJECT AT LEAST aie FROM TOP OF CHASSIS TO PREVENT SHORTING+B. -Tube and Trimmer Locations RECT. Ae INVERTER 1-1 MAGIC EYE

24、 RANGE INDICATOR l J PC WER- TONE CONTROL LOUD VOLUME CONTROL TUN NG 49 3 25 A t/11ft 19 RANGE SELECTOR -Location of Controls The left-hand push-button is a Victrola-Attachment switch. The right-hand push-button is for dial tuning. 19 2. Turn range selector to A band, turn power on, and allow a few

25、minutes for warming up. 3. Press down the dial -tuning (right-hand) button. 4. Manually tune in the first station on the list, using the Magic Eye for accurate tuning. 5. Hold down the dial -tuning button, and press dowe station button No. 1 (second from left). Both buttons will stay down. Move stat

26、ion -setting contact No. 1 to the insulating line on the, disc at rear of gang. When the contact is correctly centered on the insulating line, the central dial lamp will go out. 6. Press down any other button in order to release the dial -tuning button and station button No. 1. Then press down stati

27、on button No. 1 again. The electric tuning mechanism will function to tune in the station, and the central dial lamp will stay on. 7. Repeat this process for the remaining stations. 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 IMC ANUA Oil LIMA 11 Ss. P.GUI SPOON 1x01 . OIniN O N

28、ull./ Tie, 1011110N IIIAL. iONDON SOWN, M S C O w . Ui N I D -D. - - - - - - - - - - - - - - - - I 15:10 15.15 15.20 15.25 15:30 15:35 MC 19 25 IM C MAYA (111 NIP. G0 u Al11A ( TOKYO LONDON .GUI LONDON MEXCO CUT An SW NU101N LONDON MIUN IOSTON COME N TONI MON IITSIUIOM 11.70 11.75 11.80 11.85 11.90

29、25 MC STANDARD BROADCAST POLICE A A 55 60 70 80 100 120 140 160 31 ;AC MEXICO CITY (OPIMNAGIY SOWN LONDON MOSCOW CATAOINA MAD11D LONDON SCNIN tEVSOACIILlt 31,SIS ANTLA CIO OM 9.50 lnDA 0UtN0f A11E1 9.55 9.60 9.65 MC 31 49 IMC DUATEMALA CITY AMA 10110141(110/110 10301110 1OMI X3 OM x MInG .111(0 NIT

30、MAMA=AI OANCAM CITY 11111(11 011 . SS f 11G0 M 1011_GN (MISAI IIOH110 NTT LA Clan 5.95 6.00 6.05 6.10 6.15 6.20 MC 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 11111 Reduced Reproduction of 1f1-cci,cr Dial, and Corresponding 0-180 Calibration Scales REPLACEMENT PARTS 49 Insist on

31、 genuine factory -tested parts, which are readily identified and may be purchased from authorized dealers. STOCK No. DESCRIPTION STOCK No. DESCRIPTION RECEIVER ASSEMBLIES 31253 Board -Antenna and ground terminal board. 12714 Capacitor -Adjustable trimmer, 2-12 mmfd. (C39) 12884 Capacitor -Adjustable

32、 trimmer, 2-20 mmfd. (C4, C10) 31252 Capacitor -Adjustable trimmer, 5-80 mmfd. (Cl) 31353 Capacitor -15 mmfd. (C43) 12896 Capacitor -15 mmfd. (C51) 31350 Capacitor -18 mmfd. (C38) 31354 Capacitor -33 mmfd. (C48) 12723 Capacitor -56 mmfd. (C47) 31349 Capacitor -62 mmfd. (C37) 12720 Capacitor -100 mmf

33、d. (C23) 31270 Capacitor -100 mmfd. (C14, C15, C17, C20) 12724 Capacitor -120 mmfd. (C13, C41) 31352 Capacitor -120 mmfd. (C42) 12725 Capacitor -150 mmfd (C18) 31351 Capacitor -190 mmto. (C40) 31348 Capacitor -510 mmfd. (C34) 30303 Capacitor -.0035 mfd. (C45) 4838 Capacitor -.005 mfd. (C19, C24, C28

34、, C29) 11393 Capacitor -.01 mfd. (C5, C12, C25, C26, C44, C49, C50) 4858 Capacitor -.01 mfd. (C9) 4870 Capacitor -.025 mfd. (C21) 4886 Capacitor .05 mfd. (C30) 4839 Capacitor -0.1 mfd. (C6, C16) 12484 Capacitor -0.25 mfd. (C33, C46) 30867 Capacitor -0.5 mfd. (C22) 5212 Capacitor -18 mfd. (C32) 14531

35、 Capacitor -25 mfd. (C31) 31544 Clutch -Variable condenser drive gear clutch and pinion gear -engages pin on motor shaft -25 cycle models only 31237 Clutch -Variable condenser drive gear clutch and pinion gear -engages pin on motor shaft, 50/80 cycle models only 31263 Coil -A band antenna coil (L5,

36、L7) PAGE 809-C Replacement Parts (Continued) 91 IK STOCK DESCRIPTION STOCK DESCRIPTION Coil -A band oscillator coil (Lao) SPEAKER ASSEMBLIES 31265 Coil -A band detector coil (L12, L13) 31264 Coil -19, 25, 31, and 49 meter bandspread 13866 Cap -Dust cap for cone center antenna coil (L1, L2, L3, L4, L

37、6) 11234 Coil -Field coil (L26) 31268 Coil -19, 25, 31, and 49 meter bandspread de- 11469 Coil -Neutralizing coil (L18) tector coil (L8, L9, ,.10, L11) 31275 Cone -Speaker cone and voice coil (L19) 31258 Coil -19 meter band oscillator coil (L20, L21) 5039 Plug -4 -contact male plug for speaker 31254

38、 Coil -25 meter band oscillator coil (L22) 31255 Coil -31 meter band oscillator coil (L23) 14534 Transformer -Output transformer (T2) 31256 Coil -49 meter band oscillator coil (L24) 14357 Washer -Spring washer to hold field coil securely 31234 Condenser -3 -gang variable condenser (C2, C3, C7, C8, C

39、35) MISCELLANEOUS ASSEMBLIES 31231 Contact -Contact tip for station -setting contact. 31276 Bracket -Band indicator mounting bracket com- 31280 Core -Adjustable core and stud for A band oscillator coil plete except less band indicating strip, cord, and tension spring 31269 Core -Adjustable core and

40、stud for i -f trans- 31282 Bracket -Magic Eye bracket and holder Button button former 31358 -Station selector switch push Contact -Push button switch contacts -compris - ing 13 contacts riveted on insulating strip. 31259 Core -Adjustable core and stud for 19, 25, 31 or 49 meter band oscillator coils

41、 31344 31273 Drum -Indicator drive cord drum 31345 Contact -Push button switch contacts -compris - 31240 Flywheel -Variable condenser drive motor fly- ing 10 contacts riveted on insulating strip. wheel 31278 Cord -Band indicator drive cord 31545 Gear -Variable condenser intermediate drive gear 31281

42、 Cord -Indicator pointer drive cord and pinion gear, 25 cycle models only 31283 Cord -Variable condenser drum drive cord. 31238 Gear -Variable condenser intermediate drive gear and pinion gear, 50/60 cycle models only 31456 Cover -8 protective covers for push button markers 31239 Gear -Variable cond

43、enser knob shaft drive gear and hub 31359 Cushion -Station selector push button rubber cushion 11891 Lamp -Dial lamp 31363 Dial -:-Station selector dial and crystal 31480 Lamp -Electric tuning adjustment indicator lamp 31362 Escutcheon -Station selector dial escutcheon - 31243 Leather -Friction leat

44、her for flywheel less dial scale and push buttons 31246 Motor -Variable condenser drive motor (M-1) 31277 Indicator -Band indicator strip -25 cycle models only 31284 Indicator -Station selector indicator pointer. 31235 Motor -Variable condenser drive motor (M-1) -50/60 cycle models only 31355 Knob -

45、Range switch, tone control, volume con- trot, or station selector knob 31228 Plate -Selector contact plate -less contacts. 31346 Lock -Plate -Push button switch lock -plate - 31227 Plate -Selector mounting plate -mounts on rear comprising 10 contact locks in one strip of variable condenser 31589 Mar

46、ker -Station call letter markers for push 5040 Plug -4 -contact female for speaker cable buttons 31271 Pulley -Motor pulley. 31457 Marker-Victrola marker for push button. 31272 Pulley -Range switch pulley 31458 Marker -Dial Tuning marker for push button 31250 Resistor -Voltage divider comprising one

47、 1,500 31280 Pulley -Indicator pointer drive cord pulley. ohms. one 2,950 ohms, one 3,400 ohms, one 12 ohms, and one 180 ohms sections (R18, R19, R20, R25, R26) 14887 31285 Retainer -Indicator pointer drive cord pulley retainer Screen -Station selector dial color screen and 14284 Resistor -22,000 oh

48、ms, 1/10 watt (R4, R7, light diffuser R28) 11210 Screw-Chass?s mounting screws, washers, and 11300 Resistor -33,000 ohms, 1/10 watt (R3, R17). lockwashers for 1 chassis 11281 Resistor -100,000 ohms, 1/10 watt (R30). 3993 Screw -No. 6-32 square head set screw for 11398 Resistor -220,000 ohms, 1/10 watt (R12, R15) pointer slide