Emerson-Radio-and-Phonograph-Corp-558 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS The first i-f transformer is located next to the XR5 tube. The trimmers are accessible through holes in the top of the can. The second i-f transformer is located between the XT4 and 1S5 tubes. The single trimming core screw extends from the end of the

2、can. Trimmers are accessible through holes in the top of the can. The oscillator coil is located behind the on-off switch. The trimmer for the oscillator is located on the smaller variable condenser section. The 600 kc oscillator core adjustment is the brass screw protruding from the end of the osci

3、llator coil. L. WSP MODEL: 558 I-f Alignment 1. Rotate the vi CHASSIS MODEL: 120058 n ,tio Schematic Symbol t Past No. DESCRIPTION Cl, C2 900022 Two-gang variable condenser *C3, C4 Trimmers, part of variable condenser *C5, C6 Trimmers, part of first i-f trans former *C7, C8 Trimmers, part of second

4、i-f transformer C9, C14 928013 100 mmfd., ceramic condenser CIO, C13 920495 0.001 mfd., 200 volt condenser Cll 920496 0.005 mfd., 200 volt condenser C12 928104 212 mmfd., ceramic condenser C15 920494 0.05 mfd., 200 volt condenser C16 920120 0.02 mfd., 100 volt condenser Cl 7 925063 16 mfd., 100 volt

5、 electrolytic condenser C18 920485 0.01 mfd., 100 volt condenser LI 700008 Loop antenna R1 350970 100,000 ohms, J4 watt resistor R2 340470 820 ohms, Yi watt resistor R3 390025 1 meg., volume control R4 351450 10 meg., x/z watt resistor R5, R9 351330 3.3 meg., J4 watt resistor R6 351130 470,000 ohms,

6、 J4 watt resistor R7 351250 1.5 meg., J4 watt resistor R8 340730 3,0,000 ohms, J4 watt resistor SPl 180029 Speaker, 3-inch P.M. TX 720028 First i-f transformer, or T1 720034 First i-f transformer T2 720028 Second i-f transformer, or T2 720035 Second i-f transformer T3 734011 Output transformer T4 71

7、6011 Oscillator coil Rotate the variable condenser to the minimum capacity position. 2. Feed 455 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 sponse. (Clip the test signal lead to the stetor of the larger capacity section

8、of the variable condenser.) R-f Alignment 1. Connect the test oscillator to a coil composed of three or four turns of wire wound in a circle approximately 12 inches in diameter. This coil should be placed parallel to and in line with the receiver loop at a distance of ap proximately 15 to 20 inches.

9、 2. Radiate a signal at 1620 kc, rotate the variable condenser to minimum capacity, and adjust the oscillator trimmer, on the smaller section of the variable condenser, for maximum response. 3. Radiate a signal at 1420 kc, tune in the 1420 kc signal, and adjust the antenna trimmer, on the larger sec

10、tion of the variable condenser, for maximum response. 4. Radiate a signal at .600 kc, set the dial indicator to 60, and adjust the oscillator coil core trimmer while rocking the variable condenser for maximum response. 5. Return to 1620 kc and check alignment. If readjustment is necessary, repeat Steps 2 to 4 until no further im provement is noted. csi tcU cm! n j E h OUTPUT TRANSFORMER MOUNTED ON CHASSIS cd/ ck t ,T4 k, A S * 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