Stromberg-Carlson-Co-925 电路原理图.pdf

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1、MANUAL OF 1942 MOST POPULAR SERVICE DIAGRAMS COMPILED BY M. N. BERMAN. SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1942 MOST POPULAR SERVICE DIAGRAMS Stromberg-CarIson Models 925 and 1025 CONTINUITY TEST NOTE: These receivers use either a 6AC7 or 7V7 tube in the modulator stage. (See wiri

2、ng diagram Remove all tubes and disconnect all plugs from the chassis before checking continuity. Use a good meter capable of measuring accurately up to several megohms. The resistances given are often approximate, owing to electrolytic capacitors in the circuit. When this is the case, be sure to re

3、verse the test leads and read the highest resistance. Read from indicated terminals to chassis base unless otherwise specified. TERMINALS OF SOCKETS Circuit R. F. Amplifier Modulator 18000II 80000ft 150ft 50000ft C 80000ft S S 6SJ7 2nd Limiter (F. M.) 6H6 Discriminator (F. M.) 6SQ7 Demod., A. V. C.

4、(A. M.), Audio Amplifier 6SC7 Audio Amp. and Inverter Output Output 100000 S 100000ft 100000ft 10M _S E S 250000 220000 9000ft 3M 200000ft 1200ft S 17000ft 17000ft 400000ft O S 17000ft 170000ft 400000ft O Symbols shown on chart are as follows: ftohms; Mmegohms; Sshort; Oopen. NORMAL VOLTAGE READINGS

5、 8 21000ft 18000ft S 18000ft 280000 240000 180000 Circuit R.F, Amplifier Oscillator I. F. Amplifier 2nd I. F. Amplifier (F. M. 1st Limiter (F. M.) 2nd Limiter (F. M.) Discriminator (F. M.) Demod., A. V. C. (A. M.), Audio Amplifier Audio Amp. and Inverter Output ut Rectifier Tuning Indicator TERMINALS OF SOCKETS 1 2 3 0 0 0 +100* Read on 1000 volt scale of voltmeter. Between terminals 2 and 8 of rectifier socket5 volts A. C. 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