RCA-Victor-Co-Inc-40X31 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN MANUAL OF 1940 MOST POPULAR SERVICE DIAGRAMS Models 40X-30 and 40X-31 (Chassis No. RC405C & D) STDET.&0SC 12SA7 I. F AMPL I2 5K7 DEI. ,A.F S. A V C. I2SQ7 OUTQUl 35L6GT .ozs 35U&T 1ZSQ7 r4 40 Cl 12SK7 3575GT 1/25A7 9I5KCC /C5 st1F Cl CZ 2 2 iuGih 455KC %skc 22 Output Meter Al

2、ignment.Connect the meter across the voice coil, and turn the receiver volume control to maximum. Test-Oscillator.Connect the low side of the test-oscillator to the receiver chassis, through a .01 mfd. capacitor, and keep the output as low as possible. Pre-setting Dial.With gang condenser in full me

3、sh, the pointer should be horizontal. Antenna.The set is equipped with a built-in loop antenna. If an outdoor antenna is used, it may be connected to the “ANT.” terminal on rear of cabinet. It should not be longer than 100 feet, including lead-in. If it is longer, connect a 100 to 200 mmf. capacitor

4、 in series with the lead-in. Power-Supply Polarity.For operation on d-c, the power plug must be inserted in the outlet for correct polarity. If the set does not function, reverse the plug. On a-c, reversal of the plug may reduce hum. Steps Connect the high side of test- oscillator to- Tune test-osc.

5、 to Turn radio dial to Adjust the fol lowing for max. peak output 1 Tuning condenser stator (osc.) in series with .01 mfd. 455 kc Quiet point at 1,600 kc end of dial Cl, C2, C3, C4 (1st and 2nd I-F transformers) 2 Antenna term, of ant. loop in series with 100 mmfd. 1,680 kc Full clockwise (out of me

6、sh) C5 (oscillator) 3 1,500 kc Resonance on 1,500 kc signal C6 (antenna) Precautionary Lead Dress 1. Dress 2nd I F green lead close to chassis and under other parts. 2. Dress lead from gaig condenser to grid of 12SA7 close to chassis and away from 12SQ7 socket. 3. Dress blue 1st I-F lead under volume control close to chassis. - OSC-22 Wireless Oscillator COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN