RCA-Victor-Co-Inc-8X521 电路原理图.pdf

《RCA-Victor-Co-Inc-8X521 电路原理图.pdf》由会员分享，可在线阅读，更多相关《RCA-Victor-Co-Inc-8X521 电路原理图.pdf（4页珍藏版）》请在收音机爱好者资料库上搜索。

1、MANUAL OF 1949 MOST-OFTEN-NEEDED RADIO DIAGRAMS POWER SUPPLY POLARITY. For operation on d-c, the power plug must be inserted in the outlet for cor rect polarity. If the set does not function, reverse the plug. On -c, reversal of the plug may reduce hum. Critical Lead Dress 1. Dress ail heater leads

2、close to chassis, 2. Dress output plate bypass capacitor Cll inside of ter minal board. o. Dress all exposed leads away from each other and away from chassis. rcaVICTOR 8X521, 8X522 Chassis No. RC-1066 RC-1066A Alignment Procedure Cathode Ray Alignment is ihe preferable method. Con nections for the

3、oscilloscope are shown on 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 the test-oscillaior to the receiver chassi

4、s, 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. For additional information refer to booklet “RCA Vic tor Receiver Alignment.” NOTE.If the

5、 speaker should be removed in servic ing, its position should be checked when re-assembling. The distance between the front of the speaker and the rear chassis apron should be maintained at inches. Steps Connect the high side of test-oscillator to Tune test-osc. to Turn radio dial to Adjust the foll

6、owing for max. output 1 12BA6 I-F grid through 0.1 mfd. capacitor 455 kc Quiet-point 1,600 kc end of dial T-2 (top and bottom) 2nd I-F trans. 2 Stator of Cl through 0.1 mfd. T-l (top and bottom) 1st I-F trans. 3 1,600 kc 1.600 kc C4 (osc.) 4 Short wire placed near loop to radiate signal. 1,400 kc 1,400 kc C2 (ant.) S 600 kc 600 kc L2 (osc.) Rock gang 6 Repeat steps 3, 4 and 5. *Do not readjust T-2 when test oscillator is connected to Cl. 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