Montgomery-Ward-and-Co-54BR-1505A 电路原理图.pdf

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1、MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS MONTGOMERY WARD MODEL 548R-1505A Volume control settingMaximum (extreme clockwise) for all adjustments. Connect ground lead of signal generator to B of radio chassis through a 0.1 mfd. condenser. The loop antenna should be connected to die radio and in it

2、s proper position when making all adjustments. MODEL 54BR-1506A ALIGNMENT Signal Generator Frequency Setting Dummy Antenna Connection to Radio Variable Condenser Setting Trimmer Adjusted to Maximum 455 Kc. .1 mfd. Grid of 12SK7 I. F. Rotor full open (Plates out of mesh) Two trimmers on top of Output

3、 I. F. 455 Kc. .1 mfd. Grid of 12SA7 Mixer Rotor full open (Plates out of mesh) Two trimmers on top of Input I. F. 1600 Kc. 200 mmf. Grid of 12SA7 Rotor full open (Plates out of mesh) B.C. Osc. trimmer C2 on Gang 1400 Kc. 200 mmf. External Antenna and B Set Dial at 1400 K. C. B.C. Ant trimmer C3 und

4、er Gang i A-CANNOT BE MEASURED BY VOLTMETER Bll VOLTS A.C. ACROSS C-ll VOLTS A.C. ACROSS D-33 VOLTS A. C. ACROSS -46 VOLTS A.C. ACROSS F-II7 VOLTS A.C. ACROSS PINS 2 AND 7 PINS 7 AND S PINS 2 AND 7 PINS 2 AND 7 PINS 2 AND 4 ALL VOLTAGES MEASURED WITH A 1000-OHMS/VOLT voltmeter between ter minal INDI

5、CATED AND B-. LINE VOLTAGE 117 VOLTS A.C. 12SA7 ANTENNA TRIMMER ON GANG CONDENSER, BOT TOM SIOC. TO 50L6GT 12SQ7 12SK7 BOTTOM VIEW OF CHASSIS U4A.C. 35Z5GT C7 Cl C4 C5, ce CS C9 CIO Cll C12, C13 C12. C13 C14 2ND. DET.A.VC. A 1ST. AUOIO CONDENSERS .2 x 400 volt tubular condenser. .0002 mica type cond

6、enser, 20%. .05 x 200 volt tubular condenser. .1 x 400 volt tubular condenser. .0001 mica type condenser, 20%. .002 x 600 volt tubular condenser. .00025 mica type condenser, 20%. .004 x 600 volt tubular condenser. Electrolytic filter condenser, 50 to 60 cycles, 20 mfd.40 mfd. x 150 volts Electrolyti

7、c filter condenser, 25 cycles, 40 mfd.60 mfd. x 150 volts. .02 x 400 volt tubular condenser. RESISTORS* 1.000 ohm, % watt resistor, 20%. 47,000 ohm, % watt resistor, 10%. 220,000 ohm, % watt resistor, 20% 47 ohm, watt resistor, 10%. 3.3 megohm, Vs. watt resistor, 20% 22 ohm, % watt resistor, 10%. 4.

8、7 megohm, % watt resistor, 20% 470,000 ohm, % watt resistor, 20% 680,000 ohm, % watt resistor, 20% 150 ohm, % watt resistor, 10%. 1200 ohm, 1 watt resistor, 10%. 33 ohm, 1 watt resistor, 20%. 50L6GT OUTPUT for values of compo nents SEE LIST OF REPLACEMENT parts I2SQ7 12A7 I2SK7 SOL6GT 35Z5GT RECTIFIER 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 收音机爱 好者资料库 RadioFans.CN