Galvin-Mfg-Co（Motorola）-HS-744 电路原理图.pdf

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1、VOLUME R-20, MOST-OFTEN-NEEDED 1960 RADIO SERVICING INFORMATION MOTOROLA 1 1 MODELS CHASSIS ALIGNMENT A1 B,N,R,W HS-744 GENERATOR GENERATOR FREQUENCY CONNECTION (400 cycle mod) GANG SETTING ADJUST REMARKS CAPACITORS - Decimal values in MF, all others in MMF unless otherwise specified VOLTAGES - Meas

2、ured Irom point indicated to B with a VTVM. +10*, no signal input, 120V fiOb AC LED CHAVIS BOARD WIRING LEGEND a B+ r-AVC FILAMENT Sifl i 50C5 I2BA6 12BE6 12AV6 93 收音机爱 好者资料库 RadioFans.CN VOLUME R-22, MOST-OFTEN-NEEDED 1962 RADIO SERVICING INFORMATION MOTOROLA Models: A15, A16, Chassis: HS-744, A17,

3、 - C 15, C16, C 17 HS-922, - HS-939, C18, - C19 HS-813, - HS-938 12BE6 CONV 12BA6 IF AMP 12AV6 OET-AVC-AF AMP snrs PWR AMP BLUE CHASSIS REMOVAL MODEL A17, CIS, C16, C17 MODEL C18 MODEL A15, A16 1. Remove cabinet back - 2 screws hold it in place. 2. Remove chassis mtg. scyew at base of chassis. 3. Pu

4、ll off volume knob ONLY (Do not pull captivated tuning knob). 4. From front,unscrewpalnutunder volume control knob. 5. Unsolder appropriate leads to slide chassis out of tuning knob & cabinet. 1. Remove cabinet back - 2 screws hold it in place. 2. Pull off volume & tuning knobs. 3. From rear, remove

5、 chassis mtg. screw located on volume control mounting bracket. 4. Unsolder appropriate leads to slide chassis from cabinet. ALIGNMENT 1. Remove cabinet back - 2 screws hold it in place. 2. Pull off volume & tuning knobs. 3. From front, unscrewpalnutunder volume control knob. 4. Unsolder antenna lea

6、ds. 5. Remove 3 chassis mtg. screws. 6. Unsolder appropriate leads to slide chassis from cabinet. Use an isolation transformer between the power line and the receiver. If not available, connect low side of genera tor to B- through a .1 mf capacitor. Connect a low range output meter across speaker vo

7、ice coil and set volume control to max. Attenuate generator output to maintain 50 milliwatts on output meter to prevent overloading. (50 milliwatts is 40 volts across 3.2 ohm output (A15-A16) or .64 volts across 8 ohm output (Al7, Cl5 to C|9). STEP GENERATOR A15 to A17 C15 toC19 GENERATOR CONNECTION FREQ. (400 cycle mod) GANG SETTING ADJUST REMARKS IF ALIGNMENT 1 Grid of conv 455 Kc Fully opened 1, 2, 3 & 4 Adjust for max. RF ALIGNMENT 2 (Pin 7 12BE6) thru .1 mf & B- n 1620 Kc Fully opened 5 Adjust for max. 65 收音机爱 好者资料库 RadioFans.CN