Hoffman-Radio-Corp-A309 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS f MODELS A202 set meter on 2.5 volt scale. 2. Connect output of signal generator directly to 12BE6 control grid; connect ground side of generator to chassis of receiver through .25 Mfd. condenser. Set signal gen erator on 455 Kc (modulated). 3. Adjust

2、I.F. slugs (first T4 and then T3) for maximum reading on output meter. Note: Keep signal level low, just enough to keep maxi mum reading on lower half of meter scale. Tuning con denser plates should be all the way out; volume control should be on full. After adjustment, put a drop of wax on each I.F

3、. tuning slug to hold it in place. R.F. ALIGNMENT: control slugs 1. Set receiver tuning with all the way in. 2. Set signal generator on 540 Kc (modulated) and connect generator output to antenna post on receiver. The ground side of the generator should be connected to receiver B- through a .25 Mfd.

4、condenser. 3. Tune in signal by adjusting oscillator trimmer C5. 4. Adjust output of signal generator to obtain deflection on lower half of meter scale. 5. Adjust oscillator trimmer for maximum output. 6. Set signal generator on 1650 Kc and check signal with tuning condenser plates all the way out.

5、7. Set signal generator on 1470 Kc. 8. Tune in signal on receiver and adjust rf trimmer C2 for maximum reading on output meter. Feed only enough sig nal from the generator to keep maximum reading on lower half of meter scale. 9. Recheck at 600 Kc, 1000 Kc and 1410 Kc for tracking and readjust as req

6、uired. I2BA6 I2BC6 c7 C3 I ! KaS/n L-I voy 5 CSjl T9 ( xi)V - c Egfgj |QT)l_I e Bottom of Chassis PIN NO. 1 2 3 4 5 6 7 12BA6(R.F.) .45 0. 25. A.C. 37.5 A.C. + 65. + 80. 0. 12BE6 12BA6 (I.F.) 4.6* .45 0. 0. 12.5 A.C. 37.5 A.C. 1 25. A.C. 50. A.C. + 80. + 80. + 80. + 80. 0. 6. 12AT6 1.5* 0. 0. 12.5 A

7、.C. 0. 15. + 37.5 35L6 0. 85 A.C. +75 D.C. + 80. D.C. 0. 0. 50. A.C. 35W4 115 A.C. 0. 85. A.C. 115. A.C. 110. A.C. 110. A.C. + 110. D.C. D C. voltages measured with 1000 ohm/volt meter A.C. voltages measures with 1000 ohm/volt meter All voltages measured with reference to B- # These readings taken with V. T.V .M. NOTE: The above readings are obtained with no signal input to receiver. 2ND DCT.-A.V.C.-A.F. OUTPUT 12 AT f 35L80/GT EXT. ANT. T2 Jtj r-=-L 74 Tus? 35w4jn r4 SSlSGT/G 12 BAA tfSA* I2EI 12 AT 6 UP) 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN