Emerson-Radio-and-Phonograph-Corp-543 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS Emerson Radior _a. . o/ul rnmnniad e( fhrM tn Models 543, 544 Chassis 120046, 120052 Chassis 120046 below, 120052 next pagee l-f Alignment X. Rotate the variable condenser to the minimum capacity position. 2. Feed 455 kc to the converter grid (stator o

2、f the r-f section of the variable condenser) through a 0.1 mfd. condenser and adjust the four i-f trimmers for maximum 1. Connect the oscillator to a coil composed of three to four turns of wire wound in a circle approximately 12 in diameter. This coil should be held parallel to and in line with the

3、 loop antenna of the receiver at a distance of 15 to 20 inches. 2. Radiate a signal at 1425 kc, set the dial indicator to 1425 kc, and adjust the trimmers on the variable con denser for maximum response. 3. Radiate a 600 kc signal and tune in the signal on the receiver. Adjust the loose outside turn

4、 of the loop an tenna for maximum response. This loose turn may be moved to either side of the center. Fasten it in the posi tion which gives maximum response. 4. Repeat steps 2 and 3 until no further improvement is evident. Cl, C2 900013 *C3, C4 *C5, C6,1 C7, C8 S C9 920040 CIO 910000 Cll 920010 C1

5、2 920240 Cl 3, C14 920020 C15 920050 C15 470199 C16 920030 Cl 7, C18 925009 LI 700000 *PLl R1 310810 Two-gang variable condenser R2, R6 397000 Trimmers* part of variable condenser R3 340310 _ . - . - R4 321290 Trimmers, part of l-f transformers R5 390015 0.1 mfd., 200 volt condenser R7, R8 321130 0.

6、00022 mfd. mica condenser R9 340290 0.002 mfd., 600 volt condenser R10 370490 0.0005 mfd., 600 volt condenser Rll 321050 0.02 mfd., 400 volt condenser R12 340050 0.2 mfd., 200 volt condenser (used R13 340010 when Tl and T2 are 720000, and SPl 180000 720100 respectively), or *SWl 0.2 mfd., 200 volt a

7、ssembly (used Tl 720000 when Tl and T2 are 720525 and Tl 720525 720529 respectively) T2 720100 0.05 mfd., 400 volt condenser T2 720529 50-50 mfd., 150 volt dual electrolytic T3 734000 condenser T4 716010 Loop antenna 583010 Power plug, part of line cord 807000 22,000 ohms, watt resistor 507090 I F P

8、EAKED AT 455 K.C. 15 meg., Vi watt resistor 180 ohms, Vi watt desisteor 2.2 meg., V watt resistor O. 5 meg. volume control 470,000 ohms, J4 watt resistor 150 ohms, Vi watt resistor 1,000 ohms, 1 watt resistor 220,000 ohms, V watt resistor 15 ohms, Vi watt resistor 10 ohms, V watt resistor P. M. spea

9、ker Line switch on volume control First i-f transformer, or First i-f- transformer, midget Second i-f transformer, or Second i-f transformer, midget Output transformer Oscillator coil Pilot light Line cord Pilot light socket 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS Eme

10、rson Radio, Models 543, 544, Chassis 120052 See also preceding page for 120046 The following voltage readings are d-c measurements taken from B (line switch) to the indicated tube-socket pin. A 1000 ohms-per-volt meter should be used for all readings except those indicated by an asterisk (*) which s

11、hould be taken with a d-c vacuum-tube voltmeter. Line voltage for these readings was 117 volts, 60 cycles, ax. Measurements made with 117 volts the. will be lower than those given below. Take readings with the volume control set at minimum and the varia le con denser closed. _ Schematic Symbol tPart

12、 No. DESCRIPTION Schematic Symbol tPart No. DESCRIPTION Cl, C2 900160 Two-gang variable condenser *C3, C4 Trimmer, part of variable condenser *C7* C8* Trimmers, part of i-f transformers C9 C15 920010 0.002 mfd., 600 volt condenser CIO 920240 0.0005 mftU, 600 volt condenser Cll, C12 920020 0.02 mfd.,

13、 400 vole condenser 03 910000 0.00022 mfd. mica condenser C14 920040 0.1 mfd., 200 volt condenser C16 920030 04)5 mfd., 400 volt condenser 07, C18 925000 30-50 mfd., 150 volt dual electrolytic condenser 09 920050 04)2 mfd., 200 volt condenser LI 700000 Loop antenna, or LI 700200 Loop antenna Rl, R9

14、397000 15 meg., Vi watt resistor R2 321330 3.3 meg., Vi watt resistor LF. PEAKED AT 455 K C. R3 390015 0.5 meg. volume control R4, R5 321130 470,000 ohms, Vi watt resistor R6 340290 150 ohms, watt resistor R7 370490 1000 ohms, 1 watt resistor R8 310810 22,000 ohms, Vi watt resistor R10 340010 10 ohm

15、s, V* watt resistor Rll 397040 15 ohms, 1 watt wire-wound n R12 321050 220,000 ohms, Vi watt resistor SPl 180000 P.M. speaker *SW1 Line switch on volume control T1 720000 First i-f transformer T2 720100 Second i-f transformer T3 734000 Output transformer T4 716010 Oscillator coil 583010 Line cord 807000 Pilot light 507090 Pilot light socket EXTERNAL ANTENNA CONNECTION AC. OR DCfT Schematic Circuit Diagram Chassis 120052 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN