RCA-Victor-Co-Inc-RC-1079C 电路原理图.pdf

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1、MANUAL OF 19S0 MOST-OFTEN-NEEDED RADIO DIAGRAMS rcaVict0R AC-DC Radio Receiver Models 9X5619X562 Chassis No. RC-1079-B RC-1079-C Lead Dress 1. Dress all heater leads down to chassis and away from all audio grid and plate wiring. 2. Dress power cord down to chassis base and corner. 3. Dress capacitor

2、 08 against back apron. 4. Dress capacitor 03 down to base alongside of shielded lead. 5. Dress output transformer leads down to chassis. 6. Dress capacitors C9 and 05 as direct as possible. 7. Dress dial lamp leads on top of chassis between 12SQ7 and 50L6GT tubes; below chassis, as short as possibl

3、e to rectifier socket. 8. Dress excess loop leads away from tubes and clear of tuning condenser. Dial Calibration With the tuning condenser fully meshed, the dial pointer should be set to the first score mark at the left- hand end of the dial back plate. The four score marks represent: Max. cap. 600

4、 kc 1400 kc min. cap. SHOWN WITH TUNING CONDENSER AT MAX. CAPACITOR (CLOSEO) SOOKC- Dial back plate- Alignment Procedure Test-Oscillator. For all alignment operations, con nect the low side of the test-oscillator to the receiver chassis, and keep the oscillator output as low as possible to avoid a-v

5、-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. Connect the high side of test-oscillator Tune test-osc. Turn radio dial to Adjust the following for max. output 12SK7 I-F grid T2 (top through 0.1 and bot

6、tom) mfd. capacitor Quiet-point 2nd I-F trans. 455 kc 1600 kc Stator of end of dial *Tl (top Cl through and bottom) 0.1 mfd. 1st I-F trans. 1620 kc Min. cap. C4 (osc.) Short wire placed near 1400 kc 1400 kc fC2 (ant.) L3 (osc.) Rock gang loop to radiate signal 600 kc 600 kc I 6 j_j Repeat steps 3, 4

7、 and S._| *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. PHONO INPUT JACK U52SXffl U2SQ7 J VRfiCT./ DEt-AF-AVC RADIO PHONO SW. 455 KC TOP B

8、OTTOM VOL. CONT. SWITCH | Ct C3 ant osc. / I CZy C4 1400KC 1620 KC Dial Indicator and Drive Cord Tube and Trimmer Locations VI 12SA7 CDNV. V2 12SK7 I. F. J * v-_ V3 12SQ7 DET.-AF-AVC V4 50L6-GT OUTPUT J107 V. cr T3 .am, blk CATHODE CURRENTS 12SA7 10.05 MA I2SK7 10.25 MA 12SQ7 .13 MA SOLE-6T 33.0 MA

9、3SZS-GT 55.0 MA V 35Z5-GT RECT. WIRING INSULATED PROM CHASSIS 184 VOLTAGES MEASURED TO COMMON WIRING WITH VOLTOHMY3T SHOULD HOLO WITHIN 20* WITH RATED POWER GUPPLV. CAPACITOR VALUES GREATER THAN 1 ARE IN MMF., LESS THAN 1 ARE IN MP. UNLESS OTHERWISE INOICATED. “ (ON VOL. CNTL.) 收音机爱 好者资料库 RadioFans.CN