Emerson-Radio-and-Phonograph-Corp-570 电路原理图.pdf

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1、MANUAL OF 1949 MOST-OFTEN-NEEDED RADIO DIAGRAMS EMERSON RADIO MODELS: 570 - 574 - 580 CHASSIS MODEL: 120064 Schematic Symbol tPart No. DESCRIPTION Cl, C2 900022 Two-gang variable condenser *C3 Part of O Trimmer *C4 Part of C2 Trimmer *C5, C6 Part of T1 Trimmer *C7, C8 Part of T2 Trimmer C9 928013 0:

2、0001 mfd. ceramic condenser CIO 920497 0.001 mfd., 200 volt condenser Cll 920496 0.005 mfd., 200 volt condenser C12 928104 212 mmfd., ceramic condenser C13 920497 0.001 mfd., 200 volt condenser 04 928010 0.0001 mfd., ceramic condenser (Alternate part 928013) 03 920494 0.05 mfd., 200 volt condenser 0

3、6 920120 0.02 mfd., 100 volt condenser 07 925063 16 mfd., 100 volt electrolytic condenser 08 920483 0.01 mfd, 100 volt condenser LI 700019 Loop antenna L2 708007 Loading coil R1 340970 100,00 ohms, A watt resistor R2 340470 820 ohms, A watt resistor- R3 390023 1 meg., volume control R4 331430 10 meg

4、., Vz watt resistor R5 351330 3.3 meg., A watt resistor R6 351130 470,000 ohms, A watt resistor R7 351230 1.5 meg., A watt resistor R8 340730 10,000 ohms, A watt resistor R9 351330 3.3 meg., A watt resistor l-f Alignment 1. Rotate the variable condenser to the minimum capacity position. 2. Feed 455

5、kc to the grid (pin 6) of the 1R5 tube through a 0.01 mfd. condenser. 3. Adjust the four i-f trimmer screws for maximum re- j sponse. (Clip the test signal lead to the stator of the larger capacity section of the variable condenser.) R-f Alignment 1. Connect the test oscillator to a coil composed of

6、 three | or four turns of wire wound in a circle approximately 12 inches in diameter. This coil should be placed parallel to i and in line with the receiver loop at a distance of ap- I proximately IS to 20 inches. Radiate a signal at 1620 kc, rotete the variable condenser to minimum capacity, and ad

7、just the oscillator trimmer, on the smaller section of the variable condenser, for maximum response. Radiate a signal at 1420 kc, tune in the 1420 kc signal, end adjust the antenna trimmer, on the larger section of the variable condenser, for maximum response. Radiate a signal at 600 kc, set the dia

8、l indicator to 60, and adjust the oscillator coil core trimmer while rocking the variable condenser for maximum response. Return to 1620 kc and check alignment. If readjustment is necessary, repeet Steps 2 to 4 nntil no fnrther im provement is noted. The following voltage raadings ara d-c measuremen

9、ts taken from B (chassis) to the indicated tube-socket pin. A 1000 ohms-per-volt meter should be used for all readings except those indicated by en asterisk (*), which should be taken with a d-c vacuum-tube voltmeter. Take readings with the volnme control set at minimum and the variable condenser dosed. Use fresh batteries. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN