General-Electric-Co-J602 电路原理图.pdf

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1、MANUAL OF 1941 MOST POPULAR SERVICE DIAGRAMS I2SA7 CONV-OSC. tut ts 12SQ7 35L66T OET a AUOIO OUTPUT , , BLUC f ,hn at- 19-60 cycJe receivers, omit R12 and connect A-B and X-Z ON 25 cycle receivers, add R12 and connect X-Y. Omit R16 when No. 51 dial lamp is used. General Electric Models J-602a J-603

2、Tuning Frequency Range.540-1720 KC Intermediate Frequency 455 kq Electrical Power Output (117 line volts) Undistorted.1.0 watts Maximum.1.5 watts LoudspeakerP.1 Dynamic Outside Cone Diameter.5 inches Voice Coil Impedance (400 cycles). 3.5 ohms Tubes RF Amplifier.GE-12B7 ConverterOscillator.GE-12SA7

3、IF Amplifier.GE-12B7 Detector, Audio, and AVC.GE-12SQ7 Power Output.GE-35L6GT Rectifier.GE-35Z5GT Dial Lamp (see paragraph below), , Mazda #47 or #51 GENERAL INFORMATION Models J602 and J603 are six-tube AC-DC superheterodyne eceivers with Underwriters Approval listing. The Model 602 is housed in a

4、mahogany plastic cabinet, while the Model 603 has an ivory plastic cabinet. Both the Mazda No. 47 and No. 51 dial lamps were used urmg production. When lamp No. 51 is used, the resistor 116 should be omitted. Either the metal or glass type 12B7 tube may be used in he RF or IF stage. However when the

5、 glass tube is used in he IF stage, a tube shieldmust be used to prevent oscilla- ion at the low frequency end of the broadcast band. ALIGNMENT PROCEDURE ilignment Frequencies R?.1600 KC . 455 KC 35Z5GT RECTIFIER -12,7 ,t IF Alignment Connect an output meter across the voice coil. Turn the volume co

6、ntrol to maximum. Ret test oscillator to 155 KC and keep the oscillator output as low as a readable meter reading will permit. Apply signal to the 12SA7 converter grid through a .05 mfd. capacitor and align progressively the trimmers in the 2nd and 1st IF transformers. RF Alignment When making the f

7、ollowing alignment the loop antenna must be bolted to the chassis bv the screw and spacer mount ing. The RF signal should be capacity coupled to the re ceiver loop by placing a two-foot piece of wire for an antenna on the test oscillator output post (high side). Keeping this antenna two feet or more

8、 from the receiver loop will generally insure freedom from too much coupling. Metal objects such as meters, tools, etc., should not be placed in close proximity to the loop when making this alignment. With the gang condenser plates completely closed, the pointer should line up with the first mark on

9、 the left of the scale. Set the signal generator to 1500 KC. Align (C-lb) to the signal while the pointer is on the 1500 KC mark. Peak (C-la) for maximum output. Stock No. Symbol Description RC-7049 C-la, lb, CONDENSERTuning condenser. 2a, 2b RC-235 C-3 CAPACITOR100 Mmf., mica. RC-242 C-8 CAPACITOR1

10、50 Mmf., mica. RC-274 C-9 CAPACITOR330 Mmf., mica. RC-039 C-10 CAPACITOR.01 Mfd., 600 V. paper. RC-072 C-ll CAPACITOR.05 Mfd., 200 V. paper. RC-104 C-12 CAPACITOR0.1 Mfd., 600 V. paper. RC-216 C-13 CAPACITOR47 Mmf., mica. RC-023 C-14 CAPACITOR.005 Mfd., 600 V. paper. RC-039 C-15 CAPACITOR.01 Mfd., 6

11、00 V. paper. RC-092 C-16 CAPACITOR.05 Mfd., 600 V. paper. RC-51S3 C-17a, CAPACITOR50 Mfd., 60 Mfd., electrolytic RC-235 C-3 RC-242 C-8 RC-274 C-9 RC-039 C-10 RC-072 C-ll RC-104 C-12 RC-216 C-13 RC-023 C-14 RC-039 C-15 RC-092 C-16 RC-5183 C-17a, 17b RC-235 C-18 RO-1227 R-l RQ-1275 R-2 RO-1299 R-3 RO-

12、1295 R-4 RO-1235 R-5 RQ-1339 R-6 RV-120 R-7, S-l RO-1349 R-8 RO-1323 R-9, 10, 11 RQ-1213 R-12 RQ-1239 R-13 RQ-651 R-14 RO-1299 R-15 RO-1255 R-16 CAPACITOR100 Mmf., mica. RESISTOR-47 ohm, H W. carbon. RESISTOR4700 ohm, H W. carbon. . . RESISTOR47,000 ohm, H W, carbon. RESISTOR33,000 ohm. H W. carbon

13、RESISTOR100 ohm, H w. carbon RESISTOR2.2 megohm, H W. carbon. VOLUME CONTROL0.5 megohm, bined with power switch. RESISTOR5.6 megohm, 44 W. carbon. RESISTOR470,000 ohm, X W. carbon. RESISTOR12 ohm, W W. carbon. RESISTOR150 ohm, U W. carbon_ RESISTOR1000 ohm, 2 W. carbon . . . RESISTOR47,000 ohm, 14 W. carbon. RESISTOR680 ohm, w. carbon. . . . Used in previous receivers. Dial Stringing Diagram 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