Noblitt-Sparks-Industries-Inc-184701 电路原理图.pdf

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1、VOLUME R-25, MOST-OFTEN-NEEDED 1965 RADIO SERVICING INFORMATION CODE 1. 84701 MODEL 64R29 1. A new 9V. Battery or equivalent power supply must be used. The no signal voltage must not be less than 8 volts. 2. Turn volume control to maximum. Connect output of a signal generator (modulated with 4000/8+

2、30%) to a loop antenna (4 inch in diameter, looped 2 or 3 rounds). Connect the loop antenna to the ferrite core antenna. Connect the ground terminal of the signal generator to the receiver chassis. 3. Connect a vacuum tube voltmeter (with an AC 3V or less scale) to the earphone jack (positive side c

3、onnected to negative side with an D resistor). 4., Make adjustments per the following table to gein mexlmum readings on voltmeter. During alignment adjust output level of signal generator so that voltmeter reading will not exceed 0.5V at maximum. Step Generator Frequency Position of Variable Adjust

4、for max. output 1 2 3 455 Kc Quiet point at high freq. end 3rd I.F. Trans. T3 2nd I.F. Trans. T2 1st I.F. Trans, T1 4 Repeat steps 1, 2 end 3 5 520 Kc Quiet point at low freq. end oec coll L2 6 1,650 Kc Quiet point at high freq. end oec trimmer C8 7 Repeat steps 5 and 6 8 600 Kc 600 Kc signal ant. LI position 9 1,400 Kc 1,400 Kc signal ant. trimmer Cl 10 Repeat etepe 8 and 9 收音机爱 好者资料库 RadioFans.CN