Philco-Radio-and-Television-Corp-39-71 电路原理图.pdf

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1、MANUAL OF 1939 MOST POPULAR SERVICE DIAGRAMS IPHiaiL nodsJL 39-71, eodin.121 122 qCN (bU tONDENStli / DET-OSC / 2ND. DET. A iC ISTAUDIO OUTPUT SIGNAL GENERATOR Operations in Order Output Connections to Receiver 1A7G Grid Ant. In order to adjust the receiver correctly, the dial must be aligned to tra

2、ck properly with the tuning condenser. To adjust the dial proceed as follows: Turn the tuning condenser to maximum capacity (plates fully meshed). With tuning condenser in this position set the pointer to the small “black dot at the low frequency end of the dial scale. C_To adiust the I. F. compensa

3、tors, remove the back from the cabinet, which is held in place by fcur .Th chassis is then taken out hv removing the four screws and two corks underneath the cabin and tL Tuningand Volume knobs. The I. F. compensators are located on top of the I. F. transformers. When adjusting the Antenna (2A) and

4、Oscillator (2B) compenrat, the chas.sis must be assembled in the cabinet /“R in place. The Signal Generator output lead with the h is then connected to the terminals marked Ant and Urd undernra the cabinet. The antenna and oscillator compensators are then adjusted through the holes in the bottom of

5、the cabinet. Replacement Parts Description Part No. No. Loop Assy. u txll 15 Tuning Cond. 2522 15 Tubular Cond. (.05 mf.). It Resistor (2 megohm). 33-5203J 17 Mica Cond. (35 mmf.)mounted on top of tuning condenser. 30-JUVa 1 Mica Cond, (110 mmf.).0-1031 20 Resistor (190,000 ohms). 33-419339 21 Oscillator Trans. 32-3118 22 Resistor (70,000 ohms). 33-370339 23 Tubular Cond. (.05 mf.). 30-4444 24 1st 1, F. Trans, A:;, Knob (Tuning, Volume). 27-433 Loop Antenna . Pulley (Tuning Condenser). 28-0662 COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 107 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN