Emerson-Radio-and-Phonograph-Corp-507 电路原理图.pdf

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1、Schematic Symbol Part No. DESCRIPTION Cl, C2 *C3, C4 *C5, C6, C7, C8 C9, 05 CIO Cll, 02 03 04 06 900160 920010 920240 920020 910000 920040 920030 925000 920050 700000 700200 397000 321330 390000 321130 340290 370490 310810 340010 397040 321050 220 mmfcL, 600 V. mica condenser. 07, 08 09 Dual electro

2、lytic condenser, 150 V. C2030 mfd., C2150 mfL Ll Ll Rl, R9 R2 R3 R4, R5 R6 R7 R8 RIO Rll R12 220,000 ohms, % watt carbon resistor. - - - MODELS: 507, 509, 518 (Model 522, Chassis 120004, is similar to these models) CHASSIS MODEL: 120005 Some 120005 chassis have a modi fied filter circuit and untappe

3、d out put transformer. The partial sche matic circuit diagram et the left indicates the revision. COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS Emerson Radio ADJUSTMENTS An oscillator with frequencies of 455, 600, and 1425 kc. is

4、 required. An output meter should beconnected acruas the primary or secondary of the output transformer for observing maximum response. Plug the receiver into the power supply outlet in such a way that die ground side of the power line is connected to the re ceiver B Always use as weak a test signal

5、 as posrihle, turning down the output of the test oscillator as the alignment of the receiver progresses. Location of Coils and Trimmer Adjustments The first i-f transformer (T2) is mounted on top of the chassis deck to the right of the variable condenser. The trim mers (C6, C7) are accessible throu

6、gh holes in the top of the can. The second i-f transformer (T3) is mounted on top of the chassis between the variable condenser and the speaker. The trimmers (C8, C9) are accessible through holes in the top of the can. The trimmer for the antenna (C5) and the trimmer for the oscillator coil (Cll) ar

7、e located on the variable condenser. The trimmer on the front section is for the oscillator coil. The oscillator coil (T4) is located underneath the chassis. The loop antenna acts as the antenna coil. Models: 507, 509, 518 Chassis: 120005 I-F Alignment 1. Rotate the variable condenser to the minimum

8、 capacity position. 2. Feed 455 Icc. to the converter grid (stator of the r-f section of the variable condenser) and adjust the four i-f trimmers for maximum response. R-F Alignment 1. Connect the oscillator to a coil composed of three to four turns of wire wound in a circle approximately 12 in dia

9、meter. This coil should be held parallel to and in line with die loop antenna of the receiver at a distance of 15 to 20 indies. 2. Radiate a signal at 1425 kc., set the dial indicator to 1425 kc., and adjust the trimmers on the variable condenser (C5, Cll) for maximum response. 3. Radiate a 600 kc.

10、signal and tune in the signal on the re ceiver. Adjust the loose outride turn of the loop antenna for maximum response. This loose turn may be moved to either ride of the center. Fasten it in the position which gives maximum response. 4. Repeat steps (2) and (3) until no further improvement is evide

11、nt. FREQUENCY RANGE: 540-1620 kc. VOLTAGE ANALYSIS 9 PIN NUMBER 1 2 3 4 5 1 6 7 3 1 12SA7 89 89 *-10 I 2ESI 12SK7 Mxrm 1 89 89 | 12SQ7 *-0.7 SB *-0.5 B 37.5 50L6 110 89 fl 35Z5 116 H 116 117 I The voltage readings are d-c measurements taken from B- (line switch) to the indicated tube-socket pin. A 1

12、000 ohm-per-volt meter should he used for all readings except those indicated by an asterisk (*), which should be taken with a vacuum-tube volt meter (adjusted to measure d-c). These readings were obtained with a. power input of 117 volts, 60 cycles a.c. Measurements made with 117 volts d.c. input will be lower than those given above. Take readings with the volume control set at minimum and the variable condenser in the closed (maximum capacity) position. COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN