Emerson-Radio-and-Phonograph-Corp-548 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS MODEL: 548 549 CHASSIS MODEL: 120051 To replace tubes, remove the two knobs and unscrew the four red screws holding the chassis support to the cabinet at the bottom. Lift the board and chassis out and set it aside. Normally, the record changer should n

2、ot require addi tional lubrication. A drop of machine oil on the turntable shaft bearings, motor bearings, and frictional surfaces once a year will do no harm. Do not lubricate the trip mechanism or allow oil to come in contact with the idler wheel. Cl 920170 1 C2 920020, ci, C6 920030 C4 910010 C4

3、910220 C5 910000 C5 910230 C8, C9 925009 CIO 920420 R1 390016 R2 397000 R3, R4 351130 R5 370290 R6 340430 R8 390370 R9 340050 R10 394160 n from B (line switch! 0.001 mfd., 600 volt condenser &02 mfd., 400 volt condenser 005 mfd., 400 volt condenser 0.00011 mfd. mica condenser, or 0.0001 mfd. mica co

4、ndenser 0.00022 mfd. mica condenser, or 0.0002 mfd. mica condenser 50-50 mfd., 150 volt dual electroly tic condenser 0.15 mfd., 200 volt condenser 0.5 meg. volume control 15 meg., 4 watt resistor 470,000 ohms, Yz watt resistor 150 ohms, 1 watt resistor 560 ohms, Yz watt resistor 2 meg. tone control

5、15 ohms, Yz watt resistor 133 ohms, 5 watt resistor to the indicated tube-socket pin. A 1000 ohms-per-volt meter should be used lor all readings except those indicated by an asterisk (*), which should be taken with a d-c vacuum-tube voltmeter. Line voltage for these readings was 117 volts, 60 cycles, a-c. PIN NUMBER TUBE 1 2 3 4 5 6 7 12AT6 *0.7 45 50B5 7.8 118 123 35W4 128 128 PILOT LIGHT 收音机爱 好者资料库 RadioFans.CN