Hallicrafters-Inc-TW-102 电路原理图.pdf

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1、VOLUME R-16, MOST-OFTEN-NEEDED 1956 RADIO SERVICING INFORMATION 1.4-Hi* * r * i* ,! V l1*_ilj ev uLi_?J_J V2 1p IU4 86VI the hallicrafters co. MODELS TW-100, TW-IOI, TW-102 I RFC | i i_I RI2 125V 3-W T I * T * T NOTE! ALL VOLTAGE READINGS MADE WITH VTVM. GROUND OF VTVM AT 8-. LINE VOLTAGE 117 VOLTS

2、60 CYCLES. VOLUME CONTROL AT MAXIMUM CLOCKWISE POSITION WITH NO SIGNAL. ALL RESISTANCE READINGS MADE WITH RESPECT TO 8*. GENERAL ALIGNMENT PROCEDURE 1. Connect a low voltage A.C. voltmeter across the speaker voice coil. 2. Connect signal generator through a .05 mfd. ca pacitor to pin 6 of V-l, mixer

3、/oscillator tube. (1R5) Connect generator ground lead to the B- line. 3. Rotate volume control to extreme clockwise posi tion. (Maximum volume setting). 4. Adjust generator for 455 kc. output, amplitude mod ulated 30% at 400 cycles. Maintain output reading on meter constant at 0.4 volts by varying s

4、ignal generator output. 5. Using a non-metallic adjustment tool, adjust pri mary and secondary of second I-F transformer (T-3) for maximum output. 6. Adjust primary and secondary of first I-F trans former (T-2) for maximum output. 7. Remove signal generator from pin 6 of V-l, and loosely couple gene

5、rator output to ferrite stick an tenna. (Wind a short length of insulated hookup wire loosely around the antenna coil several times, and connect generator output to one end of this wire). Generator ground lead remains connected to B- line. 8. Set generator to 1640 kc., 30% modulation at 400 cycles.

6、Set receiver station selector to high end of band. (Tuning condenser fully open). 9. Adjust C-1B for maximum output. 10. Set generator to 1500 kc., 30% modulation at 400 cycles. Adjust station selector to 1500 kc. 11. Adjust C-1A for maximum output. 12. Set generator to 1000 kc. 30% modulation at 40

7、0 cycles. Adjust station selector to 1000 kc. Bring a piece of powdered iron (such as a coil slug) near the antenna loop stick until an indication is noted on the output meter. Repeat with a piece of brass. If the receiver output changes slightly, the receiver is tracking properly. 13. Repeat step 12 at 600 kc. 53 收音机爱 好者资料库 RadioFans.CN