Sentinel-Radio-Corp-1U-365 电路原理图.pdf

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1、VOLUME R-16, MOST-OFTEN-NEEDED 1956 RADIO SERVICING INFORMATION rg g 2 6 90 0 12 6 -5 SO 90 *12 6 0 0 SO* I az: All VOLTAGES EXCEPT HEATERS ARE MEASURED FROM SOCKET CONTACTS TO TMC COMMON NEGATIVE WITH A lOOO OHM PER VOLT VOLTMETER. HEATER VOLTAGES ARE MEASURED OlRCGTLV ACROSS SOCKET CONTACTS ALIGNM

2、ENT PROCEDURE .JTiK yak. Then the chassis is removed from the cabinet the loop must be mounted on the loop mounting brackets, and the two wires con- ected to the loop. (A) When aligning the 1620 KC OSCILLATOR TRIMMER or the 1400 KC ANTENNA TRIMMER, couple test oscillator to receiver loop by: (1) mak

3、e 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 near radio loop. BE SURE THAT NEITHER LOOP MOVES WHILE ALIGNING. Set receiver dial to: Any point where no interfering

4、signal is re ceived. Exactly 1620 K.C. Approx. 1400 K.C. Adjust test oscillator frequency to: 466 K.C. Exactly 1620 K.C. Approx. 1400 K.C. TEST OSCILLATOR Attach output of test oscillator to: Refer to parts layout diagram for location of trimmers mentioned below: .02 MFD. condenser See paragraph (A)

5、 above. High side to antenna . stator plates of tuning condenser. Low side to common negative. Adjust the second I.F. trans former slug for maximum out putthen adjust each of the first I.F. slugs for maximum output. See paragraph (A) above. Adjust 1620 K.C. oscillator trimmer for maximum output. See paragraph (A) above. Adjust 1400 K.C. antenna trimmer for maximum output. 141 收音机爱 好者资料库 RadioFans.CN