Philco-Radio-and-Television-Corp-N-724 电路原理图.pdf

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1、VOLUME R-25, MOST-OFTEN-NEEDED 1965 RADIO SERVICING INFORMATION Switch OPERATED BY CLOCK 50C5 I2BA6 I2BE6 I2AV6 MODELS N 723 a N-724 ONLY # PART OF Nl Cl CLOCKS* CLOCK MTR SWITCH PART Of OCT AVC CLOCK MTT CLOCK MOOCLS N723, H724 I ST AUWO MODELS N7 Bottom View Perma-Circuit Panel ALIGNMENT Connect a

2、n a-c voltmeter or oscilloscope across speaker voice coil. Connect ground lead of the AM R-F sig nal generator to chassis output lead as indicated in chart. Keep voltage across voice coil below .5 volt (re duce generator output). Set volume control to maximum, tuning control as indicated in chart. D

3、uring alignment keep antenna and chassis in same relative position as they are in cabinet. SIGNAL GENERATOR SPECIAL INSTRUCTIONS DIAL SETTING ADJUST CONNECTION TO RADIO Adjust tuning cores, in order given, for maximum output. Ground lead to B-; output lead through a .1 mf condenser to grid (pin 7) o

4、f 12BE6 or top of r-f tuning condenser. top bottom bo t tom top 1620KC 1620KC Adjust for maximum output Adjust for maximum output, 15D0KC 1500KC gBI Lm gfej NOTE: Make up a 6-8 turn, 6 inch diameter loop from insulated wire, connect to signal-generator leads, and place near radio loop. For proper ad

5、justment of the oscillator trimmer, fully open the tuning gang and insert a .006 inch non-metal1ic shim between the heel of the rotor and the top of the stator plates. Close the tuning gang sufficiently to hold the shim in place, and then remove the shim without dis turbing the gang setting. 105 收音机爱 好者资料库 RadioFans.CN