Sentinel-Radio-Corp-1U-364 电路原理图.pdf

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1、VOLUME R-16, MOSt-OFTEN-NEEDED 1956 RADIO SERVICING INFORMATION Sentinel MODEL 1U-364 | CAPACITY 2 GANG | COUPLING 2MCGaR-S | jl f-VMMMMMfr ( of VOL. COHT. | | I PAINT CO DOT jc-3B A / 0 201MP 20MF 60l MF ALL VOLTAGES EXCEPT HEATERS ARE MEASURED PROM SOCKET CONTACTS to THE COMMON NEGATIVE WITH A VAC

2、UUM TUBE VOLTMETER. HEATER VOLTAGES ARE MEASUREO OlRECTLV ACROSS SOCKET CONTACTS. I-1 jGRNj1 l?LKT clock term c ALIGNMENT PROCEDURE Use an accurately calibrated test oscillator with some type of output measuring device. When aligning the I.F. slugs use a non-metallic screwdriver. (A) When aligning t

3、he 1620 KC OSCILLATOR TRIMMER or the 1400 KC ANTENNA TRIMMER, couple test oscillator to receiver antenna by: (1) make loop consisting of five to ten turns of NO. 20 to NO. 30 size wire, wound on a 2 to 3 form; (2) connect this loop across output of test oscillator; (3) place test oscillator loop nea

4、r radio antenna._ TEST OSCILLATOR Set receiver dial to: Adjust test oscillator frequency to: Any point where no interfering signal is re ceived. 455 K.C. Exactly 1620 K.C. Exactly 1620 K.C. Approx. 1400 K.C. Approx. 1400 K.C. Use dummy antenna in series with output of test oscillator consisting of:

5、.02 MFD. condenser See paragraph (A) above. Attach output of test oscillator to: High side to antenna stator plates of tuning condenser. Low side to common negative. See paragraph (A) above. See paragraph (A) above. Refer to parts layout diagram for location of trimmers mentioned below: Adjust each of the I.F. trans former slugs for maximum output. Adjust 1620 K. C. oscillator trimmer for maximum output. _ Adjust 1400 K. C. antenna trimmer for maximum output. 140 收音机爱 好者资料库 RadioFans.CN