RCA-Victor-Co-Inc-8X542 电路原理图.pdf

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1、MANUAL OF 1949 MOST-OFTEN-NEEDED RADIO DIAGRAMS rcaVictor X541 8542,8X547 Chassis No. RC-1065, RC-1065A INDICATES I COMMON WIRING _L INSULATED - FROM CHASSIS- VOLTAGES MEASUREO With CHANALYSt OR VOLTOHMYST and SHOULD t-OLD WiTMiN 20% OSC. COIL TERM. VICW Alignment Procedure Cathode-Ray Alignment is

2、the preferable method. Con nections for the oscilloscope are shown in the schematic diagram. Output Meter Alignment.If this method is used, con nect the meter across the voice coil, and turn the receiver volume control to maximum. Test-Oscillator.For all alignment operations, connect the low side of

3、 the test-oscillator to the receiver chassis, and keep the oscillator output as low as possible to avoid a-v-c action. On AC operation an isolation transformer (115 V./115 v.) may be necessary for the receiver if the test oscillator is also AC operated. Dial Centering: If the mounting of the tuning

4、condenser has been dis turbed, it may be necessary to adjust its position after replacing the chassis in the cabinet. This may be done in the following manner: 1. Install chassis and tighten the three mounting screws. 2. Replace tuning knob. 2. Loosen the two screws which hold the tuning con denser

5、mounting bracket to the chassis. 4. Adjust the position of the tuning condenser mount ing bracket so that the tuning knob may be rotated without binding on the cabinet. With tuning con denser plates fully meshed the dial should be in the position indicated below. 5. The two screws should then be tig

6、htened to main- Steps Connect the high side of test-oscillator Tune test-osc. to Turn radio dial to Adjust the following for max. output 12SK7 1-F grid through 0.1 mfd. capacitor 4SS kc Quiet-point 1600 kc end of dial T2 (Top and bottom) 2nd 1-F trans. 2 Stator of Cl through 0.1 mfd. *T1 (top and bo

7、ttom) 1st 1-F trans. 3 1600 kc 1600 kc C4 (osc.) 4 Short wire placed near loop to radiate signal 1400 kc 1400 kc + C2 (ant.) S 600 kc 600 kc L2 (osc.) Rock gang 6 Repeat steps 3, 4 and 3. Do not readjust T2 when test oscillator is connected to Cl. tWhen adjusting C2 (ant. trimmer) it is necessary to have the loop in the same position and spacing as it will have when assembled in the cabinet. This spacing is 3!% from chassis to loop. DIAL KNOB -LINE CORD 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN