Emerson-Radio-and-Phonograph-Corp-GC448 电路原理图.pdf

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1、MANUAL OF 1942 MOST POPULAR SERVICE DIAGRAMS Rl, RIO R4, R6 R7, R9 C5, C17 C6, C7, C9 C8 CIO, Cll C14, C19 Cl 6, C21 3 megohm 14 watt carbon resistor * J L-g jfM W 100,000 ohm 14 watt carbon resistor. 15,000 ohm 14 watt carbon resistor 15 megohm 14 watt carbon resistor. 75 ohm 14 watt carbon resisto

2、r.- MODEL: GC-448 1 megohm 14 watt carbon resistor.- CHASSIS MODEL: GC 5 megohm 14 watt carbon resistor.- - 2500 ohm 1 watt carbon resistor 10 megohm 14 watt carbon resistor Alignmsnt Volume control 3. megohm._ , Rotate variable condenser to minimum capacity posi tion. 500 ohm 1 watt carbon resistor

3、.- Feed 455 kc tQ the gr;d of he 1RS tube through a 980 ohm 14 watt wire-wound, moulded 0.01 mf condenser. Adjust the three i-f trimmer screws ,_ , . , . for maximum response. (Clip the i-f input to the stator lug of the larger variable condenser section.) 950 ohm 5 watt wire-wound, ceramic 0.02 mf,

4、 100 volt tubular condenser. R-f Alignment 0.25 mf, 100 volt tubular condenser. Set the dial pointer at 160. Set the signal generator 0.00005 mf, ceramic condenser_ at 1600 kc and feed its output into a loop of wire about _ . , . , , one foot in diameter. Hold this radiating loop about one trimmer,

5、part o i- tr ormer. foot away from and parallel to the receiver loop antenna. 0.01 mf, 100 volt tubular condenser- Advance the output of the generator until deflection is Fixed condenser, part of i-f transformer. obtained on the output meter. Adjust first the oscillator trimmer (smaller section of v

6、ariable condenser) then 0.0001 mf, ceramic condenser- the: antenna trimmer (larger section of variable con- 0.001 mf, 100 volt tubular condenser._ denser) for maximum response. Set the dial pointer at , , . , . 60. Feed 600 kc and rock the variable condenser while 0.002 mf, 150 vot tu ar con enser a

7、djusting the oscillator core adjustment for maximum 40. mf, 40 volt dry electrolytic condenser response. Return to 1600 and check alignment. If re- 0.001 mf, 100 volt flat wound condenser adjustment is necessary return to 600 and repeat entire MODEL: GC-448 CHASSIS MODEL: GC I-f Alignment Rotate var

8、iable condenser to minimum capacity posi tion. Feed 455 kc to the grid of the 1R5 tube through a 0.01 mf condenser. Adjust the three i-f trimmer screws for maximum response. (Clip the i-f input to the stator lug of the larger variable condenser section.) procedure. C20 3 S 4 rTT11!1 FRONT SECTION OF SWITCH ViEWEO FROM FRONT_ SWITCH SHOWN IN MAXIMUM COUNTER CLOCKWISE POSITION (ACDC OPERATION) REAR SECTION OF SWITCH VIEWEO FROM FRONT COMPILED BY M. N. BE3TMAN, SUPREME PUBLICATIONS 43 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