RCA-Victor-Co-Inc-8X53 电路原理图.pdf

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1、MANUAL OF 1949 MOST-OFTEN-NEEDED RADIO DIAGRAMS -GONV. GAIN AO Jt 600 KC/455 KC VI 1ST. PT-DSC- IESA7 biv ITH iV. FUCO BIAS _ ,95x J 100 * 433KC 45JKC -50 X- *00L V3 HOpET-A-ff-AVC 3gv 4* V4- SJflw -io3v 50 L.6.6T fcuu In some chassis transformers stamps! 970441-5 may be used. The identifying num be

2、r is stamped on the side of the shield can. The schematic diagram belowshows the connections, d-c resistance and shunt cap acitors of transformers stamped 970411-5. Voltages n.casured with RESPECT TO COMMON - B , AND SHOULD HOLD WITHIN 20% With 117 V. a.c. supply. MEASURED WITH ChANAIYST OR voltohmy

3、st. I2SA7 12SK7 UNDER. CHASSIS VIEW COIL RESISTANCES LESS THAN in,NOT INDICATED. INDICATES CHASSIS GROUND. INDICATES I COMMON WIRING _L INSULATED “ FROM CHASSIS. H7v. -jy- AC-DC -iJU CATHOPE CURRENTS 125A7 -5MA. 12SK7 12.1 MA- 12SQ7 .12 MA. 50LG-GT 33.0 MA. 35Z5-GT 54-1 MA. Alignment Procedure ON VO

4、L. - 1 CONTROL rca Victor Model 8X53 Chassis No. RC-1064 Output Meter Alignment.If this method is used, connect the meter across the voice coil, and turn receiver the volume control to maximum. Test-Oscillator.For all alignment operations, connect the low side of the test-oscillator to the receiver

5、chassis, and keep the oscillator output as low as possible to avoid a-v-c action. Calibration Scale.The glass tuning dial may be removed from the cabinet and mounted above the pointer for reference during alignment. The extreme left hand mark of the Standard Broadcast scale must be in line with the

6、left hand mark on the dial backing plate. Dial Backing Plate.In the event that only the chassis is returned for service, the masks on the dial backing plate may be used during alignment; refer to the Dial Indicator and Drive Mechanism drawing for correspond ing frequencies, Dial Pointer.With the gan

7、g condenser in full mesh the dial pointer should be set to the left hand reference mark on the dial backing plate. For additional information refer to booklet, RCA Victor Receiver Alignment. Steps Connect the high side of test-oscillator to Tune test-osc. to Turn radio dial to Adjust the fol lowing

8、for max. peak output 12SK7 I-F grid through 0.1 mfd. capacitor 455 kc Quiet-point 1,600 kc end of dial T2 Top 4 bottom 2nd. I-F trans. 2 Stator of Cl through 0.1 mfd. *Tl Top 4 bottom 1st. I-F trans. 3 Short wire placed near loop antenna 1,300 kc 1,300 kc C4 (osc.) C2 (ant.) 4 600 kc 600 kc “A” Band L2 (osc.) Rock gang 5 Repeat steps 3 and 4 *Do not readjust T2 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