General-Electric-Co-J53 电路原理图.pdf

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1、MANUAL OF 1941 MOST POPULAR SERVICE DIAGRAMS Models J-nl, J-53, J-54, and J-54W I2SA7 OR I2SA7GT Bl _L4 gr 2iS(lF1 I2SQ7GT 50L6GT C13 -1 Tl pis32llcAL RD +- -fYEL = CI0 R4 R5 R8 General Electric CI7o. 35Z5GT r SI I2SQ7GT rl2B7 I2SA7GT 50L6GT *“A” rated receivers have X” connected to “Y” and R-LO is

2、shorted. “C” rated receivers have “X” connected to Z. Antenna section of tuning condenser OsciLlator section of tuning condenser 47 mmf. mica capacitor 470 mmf, mica capacitor .05 mfd. paper capacitor ,005 mfd. paper capacitor ,005 mfd, paper capacitor i 330 mmf. mica capacitor I ,01 mfd. paper capa

3、citor I; .05 mfd, paper capacitor II 30 mfd. 1 50 V. dry electrolytic I PARTS DESCRIPTION LIST 40 mfd. 150 V. dry electrolytic 0.2 mfd, paper capacitor ,01 mfd. paper capacitor Beam-a-Scope Oscillator Coil 1st. I.F. transformer 2nd l.F. transformer Dial lamp, Mazda No. 47 33.000 ohms carbon resistor

4、 2.2 megohms carbon resistor 470.000 ohms carbon resistor Description j 0.5 megohms volume control ; 4.7 megohms carbon resistor ! 470,000 ohms carbon resistor | 470,000 ohms carbon resistor I 150 ohms carbon resistor j 1200 ohms 1 W. carbon resistor 1 13 ohms carbon resistor i Power switch Output t

5、ransformer voltages measjreo I2SQ7GT SOCKET 7 f KM | f ALS AND -B /A 54|(k) (PX A? HX * V0L r r, OF k- o a . P) (h)m7* Q (njy Ss) (suN 9/p) w /h) k/ f) p AT VG frJ BOTTOM VIEW OF CHASSIS MAX VOLUME GANG CLOSED ALIGNMENT PROCEDURE Alignment Frequencies GENERAL INFORMATION Models J-51, J-53, J-54 and

6、J-54W are compact, five-tube superheterodyne receivers which can be operated from either an AC or DC source of power. Model J-51 and J-53 cabinets are in matched walnut veneers. Model J-54 and J-54W cab inets are plastic in oak and gray-white respectively. All models incorporate the following design

7、 features: Built-in Beam-a-Scope, 5-inch dynapower speaker, increased dial length, automatic volume control, and beam power output. The glass tubes used in the converter and detector stages are interchangeable with metal tubes if the receiver is realigned following the change, Precaution If the sign

8、al generator is AC operated use an isolating transformer between the power supply and the radio receiver power input. The use of an isolating capacitor is not recom mended as AC current through the capacitor will introduce hum modulation and/or create*the possibility of a burned-out signal generator

9、 attenuator. . 455 KC 0 10 20 30 4 0 50 60 70 80 90 100 110 120 130 140 150 160 170 180 55 60 65K?B M loV l 140 160 D 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 Frequency-degree Reference Chart Special Service Information The following information will be very useful in servicing

10、 receivers if a vacuum tube voltmeter or similar voltage measuring instrument is available. (1) Stage Gains Gain* Antenna Post to Converter Grid. . . .4.0 at 1000 KC R.F. on Converter Grid to I.F. on I.F. Amplifier Grid.40 at 1000 KC I.F. on Converter Grid to I.F. on I.F. Amplifier Grid.50 at 455 KC

11、 I.F. Amplifier Grid to Detector Plate. . 50 at 455 KC (2) 0.15-volt, 400-cycle signal across the volume control will give J-watt speaker output.* (Volume control turned to maximum.) (3) Average DC voltage developed across oscillator grid resistor (R-l).15 volts * Variations of a, 20% permissible. All readings obtained with enough signal input to give 3-wat,t speaker output. COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN