Emerson-Radio-and-Phonograph-Corp-120023B 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN MANUAL OF 1950 MOST-OFTEN-NEEDED RADIO DIAGRAMS Emerson Radio Model 586, Chassis 120023B, 120083B Circuit diagram and curves on page 36. ALIGNMENT INSTRUCTIONS 1. To position pointer, turn variable condenser fully closed and set pointer to reference mark on dial backplate at

2、the law frequency end of the dial. 2. Volume control should be set at maximum position. The output of the signal generator should be no higher than necessary At tenuate the signal Input as alignment proceeds. Use an insulated alignment tool for all adjustments. 3. Use Isolation transformer if availa

3、ble; otherwise connect a .1 mfd. condenser In series with low side of signal generator to chassis. AM Alignment 1 SIGNAL GENERATOR COUPLING BUM BAND SWITCH POSITION RADIO DIAL SETTING OUTPUT METER ADJUST REMARKS j .1 mfd. High side to Pin 8 (grid) of 6SB7Y. Low side to chassis. 455 KC Broadcast Tuni

4、ng condenser fully open. Across voice coiL fflESIHH Mumvmxn Adjust for maximum output. Reduce dummy antenna to .001 mfd. if Isolation trans. Is not used. 2 Loop 1600 KC Broadcast Tuning condenser fully open. Across voice coiL A5, (Trimmer cond. C6). Form laap af several turns of wire. Radiate signal

5、 Into receiver loop. Adjust far maximum output. Loop 1400 KC Broadcast Tune for max. output. Across voice coiL A6, (Trimmer cond. C5). Adjust far maximum output. FM l-F and Disc. Alignment Using AM Signal Generator and VTVM hum CONNECT VTVM ADJUST REMARKS i .01 mfd. High side to Pin 4 (grid) af 6SG7

6、 2nd i.f (V4). Low side to chassis. 10.7 me. (U nmodulated) Frequency modulation Tuning con denser fully open. Connect d.c. probe to point A*. Common to chassis. A7, A8, (Trans. T5). Adjust for maximum output. 2 .01 mfd. High side to Pin 4 (grid) af 6SG7 1st l-f (V3). Low side to chassis. 10.7 me. (

7、Unmodulated) Frequency modulation Tuning con denser fully open. Connect d.c. probe to paint A. Common to chassis. A9, A10, (Trans. T3). Adjust for maximum output. 3 High side to Pin S (asc. grid) of 6SB7Y canv. (V2). Low side to chassis. 10.7 me. (Unmodulated) Frequency modulation Tuning con denser

8、fully open. Connect d.c. probe to point A. Common to chassis. All, A12, (Trans. Tl). Adjust for maximum output. 1 .01 mfd. High side to Pin 4 (grid) af 6SG7 2nd l-f (V4). Law side to chassis. 10.7 me. (Unmodulated) Frequency modulation Tuning con denser fully open. Connect d.c. probe to point B. Com

9、mon to chassis. A13, (Trans. T6). Adjust for maximum output. .01 mfd. ,4 10.7 me. (Unmodulated) Frequency modulation Tuning con denser fully open. Connect d.c. probe to paint C. Common ta chassis. A14, (Trans. T6). FM l-F and Disc. Alignment Using Sweep Signal Generator and Oscilloscope. Use frequen

10、cy modulated signal, with 60 cycle modulation and 450 kc. sweep. Use 120 cycle sawtooth sweep voltage in oscillo scope for horizontal deflection. B DUMMY ANTENHA SIGNAL GENERA TOR FREQUENCY BAND SWITCH RADIO DIAL POSITION. SETTING CONNECT OSCILLOSCOPE ADJUST REMARKS | .01 mfd. High side to Pin 4 (gr

11、id) of 6SG7 1st l-f (V3). Low side to chassis. 10.7 me. (Unmodu lated). Frequency Tuning con- modulation denser fully open. Vertical Input to Paint A. Ground to chassis. A7, A8, (Trans. T5). A9, A10, (Trans. T3). Adjust for maximum autpul (height) and symmetry as per l-f alignment curve shown. 2 .01

12、 mfd. High side to Pin S Tqsc. grid) af 6SB7Y canv. (V2). Law side ta chassis. 10.7 me. (Unmodu lated). Frequency Tuning con- modulation denser fully open. Vertical Input to Paint A, Ground to chassis. All, A12, (Trans. Tl). Adjust far moxlmum output (height) and symmetry as per l-f alignment curve

13、shown. 3 .01 mfd. High side to Pin 4 (grid) af 6SG7 2nd l-f (V4). Law side ta chassis. 10.7 me. (Unmodu lated). Tuning con- Frequency denser fully modulation open. Vertical Input to Paint C. Ground to chassis. A13, A14, (Trans. T6). Alternately adjust A13 far maximum amplitude and A14 far maximum st

14、raight ness af cross-over lines, with cross-over occurring nt center af pattern as per discriminator alignment curve Continue with FM r-f alignment. FM R-F Alignment DUMMY ANTENNA SIGNAL GENERATOR COUPLING SIGNAL GENERA TOR FREQUENCY BAND SWITCH POSITION RADIO DIAL SETTING CONNECT VTVM ADJUST REMARK

15、S i ISO ohm re sistor In serisc with each gen. lead. High side to FM ent. term. Low side to chassis. 108.0 me. (Unmodu lated). Frequency modulation Tuning con denser fully open (108.0 me.) Connect dx. probe to point A”. Common to chassis. A15, (Trimmer cond. C8). Adjust for maximum output. 2 106.0 me. Frequency modulation Tune for maximum output. n A16, (Trimmer cond. C7). Adjust for maximum output. 收音机爱 好者资料库 RadioFans.CN