RCA-Victor-Co-Inc-U9 电路原理图.pdf

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1、MANUAL OF 1939 MOST POPULAR SERVICE DIAGRAMS RCA VICTROLA MODEL U-9 no. rc msb) Five-Tube, Sinsle-Band, A-C, Superheterodyne Miscellaneous Service Data PHONOGRAPH MECHANISM. The phonograph motor is self-starting and operates the turntable through friction drive between the motor spindle and the rubb

2、er tire on the underside of the turntable. The rubber driving tire on the turntable should never be removed since it is ground in to be concentric with the spindle. If replace ment is required, the entire turntable should be replaced. The speed regulator raises and lowers the motor. This changes the

3、 driving ratio between the motor and the turntable due to the motor spindle being conical in shape. It is important to adjust this regulator for a turntable speed of 78 r.p.m. WHILE PLAYING A 10- INCH RECORD WITH THE NEEDLE APPROXIMATELY ONE INCH FROM THE OUTER EDGE OF THE RECORD Lubrication.The mot

4、or should be lubricated as follows: Place a few drops of S.A.E. 20 (or equivalent) on the turntable spindle and s.aturate the oil retaining felt pads on the motor shaft with S A E 10 oil. This oiling process should be repeated once or twice a year CAUTION.THE MOTOR DRIVE SPINDLE AND RUBBER DRIVING T

5、IRE ON THE TURNTABLE MUST BE KEPT CLEAN AND ENTIRELY FREE FROM OIL AND GREASE AT ALL TIMES. motorboard .turntable motor speed SPINDLE .cREOULATOR Alisnment Procedure Output Meter Alignment.Connect the meter across the voice coil, and turn the receiver volume control to maximum. Test Oscillator.Conne

6、ct the low side of the test oscillator to the receiver chassis through a 0.01 mfd capacitor, and keep the output as low as possible. Pre-Setting Dial.With gang condenser in full mesh, the pointer should coincide with the left hand mark stamped in the dial back- plate. Antenna.This set is equipped wi

7、th a built-in loop antenna. If an outdoor antenna is used, it may be connected to the green antenna lead, stapled to the base of the cabinets The Vienna should not be longer than 100 feet including the lead-in. If it is longer, connect a lOU imnfd. capacitor in series with the lead-in. Steps Connect

8、 the high side of test oscillator to Tune test osc. to Turn radio dial to Adjust the follow ing for max. output 1 Tuning Cond. stator (det.) in series with 0.01 mfd. 455 kc Quiet Point at 1,600 kc end of dial C24, C26, C26 (1st and 2nd 1-F transformers) 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN