RCA-Victor-Co-Inc-RC-1128B 电路原理图.pdf

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1、VOLUME R-16, MOST-OFTEN-NEEDED 1956 RADIO SERVICING INFORMATION Ti indicates COMMON WmiMO INSULATED FROM CHASSIS I INDICATES CHASSIS JJtROUNO VOLTACES MEASURED ID COMMON WIRING WITH VOiTOHMYST AND SHOULD HOLD WITHIN 1 20% K* 000 ALL CAPACITOR VALUES LESS THAN 1.0 ARE IN ME. ABOVE 1.0 ARE IN MMF EXCE

2、PT AS INDICATED CATHODE CURRENTS 12 6 6 10.0 M.A. 12 BAS 7. 4 M.A- 12 A V 6 0. W M.A. SO C 5 42. 0 M.A. M W4 SO. 0 M.A. Alignment Procedure Output Meter AlignmentIf this method is used, connect the meter across the voice coil and turn the receiver volume control to maximum. Test-OscillatorFor all al

3、ignment operations, conned the low side of the tesl-oscillator to the receiver chassis, and keep the oscillator output as low as possible to avoid a-v-c action. On a.c. operation an isolation transformer (115 v./115 v.) may be necessary for the receiver i! the test oscillator is also a.c. operated.

4、Critical Lead Dress 1. Dress all circuit wiring against chassis. 2. Dress CIO such that possibility ol lead shorts to chassis are minimized. 3. Dress PC unit away from I.F. circuits and chassis. 4. Dress Cl 2 away from end of chassis to prevent shorts to side of bottom cover. 5. Dress R12 away from

5、chassis and CIO. HEATER CONNECTIONS V5 35W4 RECTIFIER RED-*. _Lc11 B Tsomf Connect the high side of Steps test-oscillator to I2BA6 I-F grid 1 through .01 mfd. capacitor Stator of 2 Cl -B through .01 mfd. Short wire placed near loop to radiate signal Tune test-osc. to Turn radio dial to Adjust the following for max. output 455 kc Quiet-point 1600 kc end of dial T2 (top) 2nd I-F trans. T1 (top and bottom) 1st I-F trans. 1620 kc Min. cap. osc. trimmer C1A-T 1400 kc 1400 kc signal ant. trimmer CIB-T Repeat steps 3 and 4. 117 收音机爱 好者资料库 RadioFans.CN