Galvin-Mfg-Co（Motorola）-HS-458 电路原理图.pdf

《Galvin-Mfg-Co（Motorola）-HS-458 电路原理图.pdf》由会员分享，可在线阅读，更多相关《Galvin-Mfg-Co（Motorola）-HS-458 电路原理图.pdf（1页珍藏版）》请在收音机爱好者资料库上搜索。

1、VOLUME R-16, MOST-OFTEN-NEEDED 1956 RADIO SERVICING INFORMATION MOTOROLA MODELS CHASSIS 66Cl Ivory HS-458 66C2 Gray HS-458 jLJO v.r rri. 12, run cowcaims 4 * I at STOtCl El CON*CTIONS TTTT Nonsi U |40 MF |30 MF 30 MF 35C5 12BA6 12B 12BE6 I2AT6 50v” 37v 25V ylZ6V 4 3 4 3 3 4 41 4 ALIGNMENT MCPT J Use

2、 an isolation transformer between the power line and the receiver. If not available, connect low side of generator to chassis through a . 1 mf capacitor. Temporarily connect the clock, antenna and speaker to radio. Connect a low range out put meter across the voice coil and set volume control to max

3、imum and tone control to treble. Attenuate generator output to maintain . 4 volts on output meter at all times to prevent overloading; if noise is too high during radiation measurements use 1. 25 volt output. I DUMMY ANTENNA IF ALIGNMENT 1. 1*1 mf RF ALIGNMENT GENERATOR CONNECTION Grid of conv. (pin

4、 7, 12BE6) Grid of conv. (pin 7, 12BE6) Radiation loop* Radiation loop* GENERATOR FREQUENCY (400 cycle mod) GANG SETTING | ADJUST Fully open I 1, 2, 3 Cc 4 I Adjust for maximum. I (IF cores) I Fully open I 5 (Osc I trim) Adjust for maximum. Tune for 6 (RFtrim) Remove dial scale background max fc 7 (

5、Ant to make trimmers accessible. trim) Adjust for maximum. Tune for 8 (RF core) Adjust for maximum. Radiation loop* Tune for I 6 (RF trim) I Adjust for maximum, max I I Connect generator output across 5” diameter, 5 turn loop and couple inductively to receiver loop. Keep loops at least 12” apart._ 1st IF 2nd IF (7) ANT TRIM (RFTRIM () RF CORE OSC TRIM 455 KC 455 KC 1400 KC 1400 KC 600 KC / 1620 KC E3 / STOP T0P|E2 PWRAMP 61 收音机爱 好者资料库 RadioFans.CN