Stromberg-Carlson-Co-1120 电路原理图.pdf

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1、DF 1946 MOST POPULAR SERVICE DIAGHAMo n.ao_ 10,00 5*1 ; Ei fTr e t- s o O g 8 fl O l I 4-o2 g a rl j So 01 O H H I H tO I o u o w 0 H O O *- u *2 4 O Cd 05 S3 8SiSf|. Ktiiif s 5 CO I? C * C c 2 S.ts c o li O V) js o O COb 1 o t *- ; vfe X w S5 o M u c o g 8 5 o CO o c o o o V *r G s s-g c 0 s o W c

2、3 * 5f 1 S? J J = o CO b iS ,-N ! si!:; I 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS STROMBERG-CARLSON NO. 1020-1120 RADIO RECEIVERS Voltage Rating_ Type of Circuit_ I_ Tuning Ranges_I ” Number and Type of Tubes7 16SK7 R. F. Amplifier 16SA7 Modulator and Oscillator 16SF7 I.

3、 F. Amplifier, Demodulator and A. V. C. Input Power Rating_ Intermediate Frequency_II_II_I HI Speaker Voice Coil Impedance at 400 Cycles_II_II_ I Speaker Field Coil Resistance_ Power Output_ _ - -A.C. 105 to 130 Volts Superheterodyne with Push Button Tuning -A540 to 1600 Kc., C8.8 to 12 Me. 1 6SC7 A

4、udio Amplifier and Inverter 2 6V6GT Output 15Y3G Rectifier - 96-H5 watts - 455 Kilocycles - Approximately 3.5 Ohm -WWW WUillO .10 Watts 10% Distortion, 12 Watts Maximum ALIGNING INFORMATION Nej*_re2jdign_unls_absolutel_necessary. Use a good modulated signal generator (test oscillator with variable o

5、utput voltage and a sensitive output meter across the voice coil of the speaker). Alwajrs align using the smallest possible input from the signal generator. A strong signal makes adiust- ments inaccurate. f Always have the volume control “full on”. ALIGNING PROCEDURE (follow this order exactly). I.

6、Intermediate Frequency Adjustments. 1. Set range switch to Standard Broadcast posi tion (loop). 2. Turn the tuning control to extreme low fre quency end of dial. 3. Connect the ground terminal of the signal generator to the gronnd terminal of the chassis. 4. Introduce a modulated signal of 455 kilo

7、cycles to the grid of the 6SA7 Modulator and Oscillator tube (terminal No. 8) using a 0.1 microfarad capacitor in series with the out put lead of the signal generator. 5. Adjust the I. F. aligners for maximum output in the following order: A. Secondary of second I. F. Transformer. B. Primary of seco

8、nd I. F. Transformer. C. Secondary of first I. F. Transformer. D. Primary of first I. F. Transformer. II. Dial Pointer Adjustment. With the plates of the gang tuning capacitor fully engaged, check to be sure that the dial pointer is in a vertical position directly on the calibration marks located at

9、 the low frequency end of the dial scale. Adjust the dial pointer if necessary. III. Radio Frequency Adjustments. Short Wave Range 1. Remove the output lead of the signal gen erator and the 0.1 microfarad capadtor from the grid of the 6SA7 tube. 2. Disconnect the output lead from the signal generato

10、r and replace with a few turns of wire connected to the signal generator output terminals. 3. Place the signal generator two or three feet from the receivers loop. 4. Set the range switch to the short-wave range position. 5. Set the signal generator frequency and the receiver tuning dial to 9 megacy

11、cles. 6. Adjust the 9 megacycle oscillator and loop aligners (iron cores) for maximum signal. 7. Set the signal generator frequency and the receiver tnning dial to 12 megacycles. 8. Adjust the 12 megacycle oscillator aligning capacitors for maximum signal. Then rock the timing gang capacitor slowly

12、through res onance and adjnst the 12 megacycle antennae aligning capacitor for maximum signal. 9. Repeat operations 5 and 6. 10. Repeat operations 7 and 8. Standard Broadcast Range 1. Set the range switch to the “Loop” position. 2. Set the signal generator frequency and the receiver tuning dial to 6

13、00 kilocycles. 3. Adjust the 600 K. C. oscillator and antennae aligner (iron cores) for maximum signal. 4. Set the signal generator frequency and the receiver tuning dial to 1400 kilocycles. 5. Adjust the 1400 K. C. oscillator and antennae aligning capacitors for maximum signal. 6. Repeat operations

14、 2 and 3. 7. Repeat operations 4 and 5. IV. Wave Trap Adjustment. 1. Tune the receiver to 1000 kc. 2. Set the signal generator frequency to 455 kc. Increase signal generator output until audible in speaker. 3. Adjust the wave trap aligning capacitor for minimum signal. VOLTAGE TABLE FOR ELECTRONIC V

15、OLTMETER Tube 1 2 3 4 5 6 7 8 6V6 Output 0 6.3AC 245 251 0 0 0 16 6V6 Output 0 0 245 251 0 0 6.3AC 16. 6SC7 1st A.F. Conv. 0 93 0 0 93 1.1 0 6.3AC 6SA7 Mod. Osc. 0 0 246 80 7.5 0 6.3AC 0 5Y3 Rect. 0 360 0 340AC 0 340AC 0 360 6SF7 I.F. Det. A.V.C. 0 .6 0 92 0 250 0 6.3AC 6SK7 _ R.F. Amp. 0 6.3AC 0 .6 0 80 0 196 COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN