CBS-Columbia-C240 电路原理图.pdf

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1、VOLUME R- 17, MOST - OFTEN -NEEDED 1957 RADIO SERVICING INFORMATION CBS-COLUMBI A Chassis 616, Model C240, Chassis 636, Models C230, C231, C232, Chassis 656, Model C220, Material on pages 15 and 16; separate diagrams shown for each chassis. Alignment Set volume control to maximum. Adjust output of s

2、ignal generator no higher than Oscillator Coil, all Chassis I necessary for satisfactory indication. Use an insulated alignment tool. Step Signal Generator Receiver Tuning Output Meter Connection Adjust Freq. Connect to 1 455KC MOD. Pin 1 of V2, 12BA6, thru .05 mf Minimum capacity Across voice coil

3、T2, top and bottom slugs, for maximum indication. 2 As above Pin 7 of VI, 12BE6, thru .05 mf As above As above Tl, top and bottom slugs, for maximum indication. 3 1620KC MOD. As above As above As above C1B, oscillator trimmer,- for maximum indication. 4 1400KC MOD. Couple inductively to loop antenna

4、 For maximum signal As above CIA, antenna trimmer, for maximum indication. Tube and Trimmer Locations Dial Stringing. VI V 2 V3 V4 15 收音机爱 好者资料库 RadioFans.CN VOLUME R-17, MOST-OFTEN-NEEDED 1957 RADIO SERVICING INFORMATION CBS-COLUMBIA Chassis 616, 636,656, Models C220, C230, C231, C232, C240 (Contin

5、ued from page 15; separate diagrams; other data for all chassis) VI V2 V3 V4 IZBAS I2AV6 50CS U CONV 45SKC ,p A*p 459KC D6T-AVC-AF AMP mum ire AF OUT / / / / L_ S A I CLOCK SoN-OFF SWI (MOTOR 3 IN CLOCK, CHASSIS Notes 1. Voltages taken with VTVM from tube socket terminals to com mon ground (not chas

6、sis). Tuning capacitor set to minimum. 2. Capacitor values less than one are microfarads, and values greater than one are micro-microfarads, unless otherwise indi cated. 3. Resistors are 10% unless otherwise indicated. K XI,000; M = XI,000,000. 4. When using AC operated test equipment, connect an isolation transformer between the chassis and the power line. IF T rans, all Chassis Couplate, all Chassis V3 I2AV6 DET-AVC-AF AMP 收音机爱 好者资料库 RadioFans.CN