CBS-Columbia-5C4 电路原理图.pdf

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1、VOLUME R-16, MOST-OFTEN-NEEDED 1956 RADIO SERVICING INFORMATION 20 收音机爱 好者资料库 RadioFans.CN VOLUME R-16, MOST-OFTEN-NEEDED 1956 RADIO SERVICING INFORMATION CBS-COLUMBIA - A Division of the Columbia Broadcasting System CBS Model 5440, Clock Radio Chassis 5C4 (Continued) Alignment Set volume control to

2、 maximum. To prevent overloading r9 use lowest range available on output meter and adjust C 7/- output of signal generator to the minimum level necessary QgC for satisfactory indication. Use an insulated alignment CIB -p-1 -r (|2AV6# tool for all adjustments. jgg 1 S I B is connected directly to one

3、 side of the power line. CIA =Sl -r / va T2 f v4 i When using AC operated test equipment connect an isola- * yl2BA 2ndlF y50C5 tion transformer between the receiver and the power line. # v5 t f Y! 1 ti . , . . I35W4) II2BE6I tst|F If an isolation transformer is not available connect a .1 mf y V y 1

4、capacitor in series with the signal generator ground lead . and B. Do not connect a ground lead directly to B. Tube and Trimmer Locations Signal Generator Receiver Output Meter Freq. Connect to Tuning Connection Adjust 455KC MOD. Pin 1 of V2, 12BA6, thru .05 mf Minimum capacity Across voice coil T2,

5、 top and bottom slugs, for maximum indication. As above Pin 7 of VI, 12BE6, thru .05 mf As above As above Tl, top and bottom slugs, for maximum indication. 1620KC MOD. As above As above As above CIB, oscillator trimmer, for maximum indication. 1400KC MOD. External antenna connection of loop antenna

6、For maxi mum signal As above CIA, antenna trimmer, for maximum indication. (See preceding page, adjacent at left, for circuit diagram and other service material.) Parts List Capacitors Miscellaneous Symbol Part No. Description Symbol Part No. Description CIA, B 24 000 221 Variable LI 79 000 041 Loop

7、 Antenna & Back C2 22 011 740 Paper, .05 mfd, 400V, 20% L2 15 000 092 Oscillator Coil C3 23 001 660 Cer., 220 mmfd, 500V, 20% Tl, T2 12 000 281 Transformers, I.F. C4 22 011 660 Paper, .01 mfd, 400V, 20% 53 071 190 I.F. Trans. Mounting Clip C5 22 011 700 Paper, .02 mfd, 400V, 20% VI 61 000 461 Tube 1

8、2BE6 C6 22 026 280 Paper, .1 mfd, 400V, 20% V2 61 000 291 Tube 12BA6 C7 22 011 740 Paper, .05 mfd, 400V, 20% V3 61 000 471 Tube 12AV6 C8A, B 21 001 091 Elec., 70-40 mfd, 150V V4 61 000 491 Tube 50C5 C12 23 002 660 Cer., 220 mmfd, 500V, 20% V5 61 000 481 Tube 35W4 73 000 102 Speaker, 4 PM, w/Trans. (

9、T3) Resistors 80 000 315 Line Cord, 6 ft. (# 16 AWG) 44 001 720 Appliance Outlet R1 30 223 230 Carbon, 22K, y2W, 10% 82 000 041 Couplate R2 30 151 230 Carbon, 150 ohm, %W, 10% 70 002 381 Cabinet, Ebony R3 30 335 230 Carbon, 3.3 Meg., %W, 10% 70 002 382 Cabinet, Maroon R4 36 000 282 Volume Control, 5

10、00K 70 002 383 Cabinet, Sand R5 30 475 230 Carbon, 4.7 Meg., y2W, 10% 70 002 384 Cabinet, Ivory R6 30 151 230 Carbon, 150 ohm, %W, 10% 76 000 694 Knob, Volume R7 30 222 250 Carbon, 2200 ohm, 2W, 10% 76 003 651 Knob, Tuning RIO 30 330 230 Carbon, 33 ohm, %W, 10% 76 003 641 Clock Rll 30 105 230 Carbon, 1 Meg., %W, 10% 74 000 491 Dial Plate 21 收音机爱 好者资料库 RadioFans.CN