Montgomery-Ward-and-Co-54BR-1504C 电路原理图.pdf

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1、MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS n MONTGOMERY WARD 35Z5GT Osc trimmer Ant trimmerJe C3T Pilot Light 6-8 Volts trimmers -50L6GT MODELS 54BR-1503C, 1504C Electrolytic input I.F. Output I.F. Replace a defective metal I2SK7 tube with another metal tube. Replace a glass I2SK7 tube with a meta

2、l tube or with an exact duplicate of the tube now in the set. SIGNAL GENERATOR Frequency Coupling Capacitor Connection to Radio Ground Connection 455 kc 0.1 mf Grid (pin 4) of I2SK7 Pin 3 of I2SK7 (B-of set) 455 kc 0.1 mf Grid (pin 8) of I2SA7 Pin 3 of I2SK7 (B- of set) 1630 kc 0.1 mf Grid (pin 8) o

3、f I2SA7 Pin 3 of I2SK7 (B- of set) 1400 kc 200 mmf External antenna clip Pin 3 of I2SK7 (B- of set) 12SA7 CONVERTER 12SK7 I.F. AMP. V EXTERNAL 5 ANTENNA C 2 A + yg t 3 Irr -jyjfes - N (-t t SR15 T L f* SRI Ji, iooo -Xs I a SITTING Capacitor full open (plates out of mesh) Capacitor full open (plates

4、out of mesh) Capacitor full open (plates out of mesh) Set dial pointer at 1400 kc 12SQ7 2ND. DET.A.V.C. a. isr audio ADJUST TRIMMERS TO MAXIMUM OUTPUT in order shown 2 trimmers on output IF can 2 trimmers on input IF can Oscillator trimmer C4 on gang Antenna trimmer C3 on gang 50L6GT OUTPUT CIO .004

5、 (m) PM SPEAKER 3.2 0NMS (ON VOLUME CONTROL R6) 1 CIS j PI 0.1 1 NOTES: O VOLTAGES MEASURED WITH A 500O-0HMS- PER-VOLT METER BETWEEN B- AND SOCKET TERMINALS. LINE VOLTAGE 117 VOLTS AC. (A CANNOT BE MEASURED WITH VOLTMETER. (| 11 VOLTS AC ACROSS PINS 2 AND 7. 0- 11 VOLTS AC ACROSS PINS 7 AND 8 . ()-3

6、5 VOLTS AC ACROSS PINS 2 AND 7. 0-49 VOLTS AC ACROSS PINS 2 AND 7. 0-117 VOLTS AC ACROSS PINS 2 AND 4. WHERE NO READING IS INDICATED VOLTAGE IS ZERO. X R12 FILAMENT WIRING 50L6GT I2SK7 I2SA7 12SQ7 35Z5GT RECTIFIER CAPACITOR VALUES IN MFD UNLESS OTHERWISE INDICATED. RESISTOR AND COIL VALUES IN OHMS. WHERE VALUE OF COIL IS NOT SHOWN, RESISTANCE IS LESS THAN ONE OHM. COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS R13 . I I WVW.WM * 1 2 7 1500 IW_ : PUBLICATIONS W 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