General-Electric-Co-HJ612 电路原理图.pdf

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1、MANUAL OF 1940 MOST POPULAR SERVICE DIAGRAMS General Electric Model HJ-612 I.F. Alignment Connect an output meter across the voice coil. Rotate the volume control to maximum. Completely close the gang condenser plates and set the dial pointer to the first dial mark at the low end of the scale. Throw

2、 the band switch to “BC” (up). Set test oscillator to-455 KC and apply signal to the control grid of the 6SA7 tube through a .05 mfd. capacitor. Do not remove the 6SA7 grid lead. Keep the test oscillator output as low as a readable meter reading will permit. Adjust all I.F. trimmers for maximum mete

3、r reading. R.F. Alignment Apply a 1500 KC signal either through a standard I.R.E. dummy to the antenna terminal or through an additional loop connected to the signal generator output which can be magnetically coupled to the receiver Beam-a-Scope. When using an I.R.E. dummy antenna for R.F. alignment

4、 do not connect a ground lead between the signal generator and the receiver. Align (C-2) at 1500 KC and peak (C-l)for maximum output. Change signal to 580 KC and tune receiver to signal. Peak (C-11) on the 580 KC signal by rocking the gang con denser. Retrim at 1500 KC. Throw the band switch to SW”

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