RCA-Victor-Co-Inc-2X61 电路原理图.pdf

MANUAL OF 1953 MOST-OFTEN-NEEDED RADIO DIAGRAMS rca Victor AC-DC Radio Receiver Models 2X61,2X62 Chassis No. RC-1080C RC-1080D ALIGNMENT PROCEDURE Cathode Ray Alignment is the preferable method. Con nections for the oscilloscope are shown on the schematic diagram. Output Meter Alignment -If this method is used, connect the meter across the voice roil and turn the receiver volume control to maximum. Test Oscillator.Connect low side of test oscillator to common wiring in series with a .1 mf. capacitor. If the test oscillator is a. c. operated it may be necessary to use an isolation transformer for the receiver during alignment and the low side of the test oscillator connected directly to com mon wiring at the electrolytic capacitor. Keep the oscillator output low to prevent a-v-c action. Slep Conned high side of sig. gen. lo Sig. gen, output Turn radio dial to- Adjust for peak output I Pin No. 4 of 12SK7 lube 4SS kc Quiel point near 600 kc Top and bottom cores of T2 2 Pin No. 8 of 12SA7 lube Top and bottom cores of T1 3 External Anienna* lerminal through 100 mmf. capacitor 1620 kc 1400 kc 1620 kc 1400 kc. C6 Osc. jr C5 R.r. C4 Am. 4 Shunt C5 with 22,000 ohm resistor 600 kc 600 kc L4 Osc. (Rock gang) 5 Remove 22,000 ohm resistor from C5 600 kc | 600 kc | 12 R.F. 6 Repeat steps 3, 4 and S The position of the loop antenna in relation to the chassis affects adjustment of C4. The correct position is indicated on the illustration “Tube and Trimmer Locations. Dial Indicator and Drive Mechanism Tube and Trimmer Locations NOTE.If reception is not obtained on d. c. operation, re verse plug in outlet receptacle. On a. c. operation this may reduce hum. The position of the speaker is adjustable; the correct posi tion is indicated on the illustration “Tube and Trimmer Loca tions. MM T L 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