Zenith-Radio-Corp-12H679 电路原理图.pdf

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1、MOST POPULAR SERVICE DIAGRAMS & SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1942 MOST POPULAR SERVICE DIAGRAMS ALIGNMENT PROCEDURE Operation Connect Oscillator to Dummy Antenna Input Signal Frequency Band Set Dial At 1 Trimmers Purpose 1 Con. Grid 0.5 mid. 455 Ko. BC COOXe. A. Bi C. D Ali

2、gn I.F. 8 R.F. Grid 0.5 mid. 455 Xe. BC lOOKe. E Adjust lor minimum 455 Xc. signal 3 Ant. Z and G 400 ohm 18 Me. BW II Me. X Scale SW Osc. at 18 meg. 4 - - II Me. SW It Me. M Align BW antenna 5 i 5 Me. Med. 5.0 Me. If Scale med. band osc. at S. meg. - - 4.5 Me. M*d. 4.5 Me. Q Align med. band antenna

3、 7 One turn loop made with generator lead or Hadex loop 1100 Xe. BC 1600 Xc. F Set BC Os?, to seal# at 1400 Xc. 8 _ MOO Xc. BC 1400 Kc. G Align broadcast loop 9 COOKc. BC COO Kc. i Rock gang to track BC padder 10 7V7 2nd IT. Grid 0.S mfd. 1.3 Me. Man. F.M. 42.5 Me. A Align lor max. deilectten across

4、 Vz discrim, load 11 M Bi Aign lor zero defection acicss lull discrim, load 12 i. *f * As * Ba Align for max. deflection across Vz discrim, load 13 7V7 lit IT. Grid - - 1 Ax Bs * 14 Converter Grid - - - H Ai Bi M 15 FJC Ant. Terminal 100 ohm 41 Me. 41 Me. Ad), earn on gang to scale osc. Align lor ze

5、ro deflection across lull discrim, load 1C #* mmm W 42.5 Me. Pi Align lor max. deflection across Vz discrim, load 17 - 43 Me. m 49 Me. P* , i - 41 Me. - 49 Me. z Models 12H67812H679 Chassis No. 12A6 Stage Gains Be. and I.F. Ant. to R.F. grid 6.5X at 1000 Kc. R.F. grid to conv. grid 28.1 X at 1000 Kc. Conv. grid to IJF. grid 265X at 455 Kc. Overall audio 807 X at 1 watt. 400 cycles. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN