Philco-Radio-and-Television-Corp-T-703 电路原理图.pdf

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1、PHILCO Cl IA ft si= rtoxr , tr* V*: - % CENT TAP LAI(PRI) START LJ 1ST IF OET TR6 JJR2 W P2 TRA MATCHED PAIf/ Bottom Composite View of Perma-Circuit Panel ALIGNMENT PROCEDURE to BArv GND Allow the test equipment to warm up for fifteen minutes before st rting the alignment procedure Connect the outpu

2、t indie tor (a-c voltmeter, or an oscilloscope) across the voice-coil terminals. Use aniMI r - f “JJ1* * erator. Conn :t the ground 1 ad to chassis, and connect the output lead as indicated in the alignnwnt charj. Attenuate th signal-generator output throughout the alignment so as to maintain the ou

3、tput level below 1 volt. SIGNAL GENERATOR STEP CONNECTION TO RADIO DIAL SETTING DIAL SETTING 1 Connect signal generator through a .1-uf. condenser to ant. section of gang. 455 kc. Tuning gang fully open. 2 Use radiating loop. (See NOTE 1 below) 600 kc. 600 kc. 3 Same as step 2. 1620 kc. 1620 kc. (Tu

4、ning gang fully open) Same as step 2. 1400 kc 1400 kc. RADIO SPECIAL INSTRUCTIONS Adjust for maximum output in order given. ADJUST Z3 - 3rd i-f Z2 - 2nd i-f Z1 - 1st i-f Adjust for maximum output. T1 - osc. core Rock tuning gang while making this adjustment. Adjust for maximum output. C1B - osc. tri

5、mmer Adjust for maximum output. CIA - antenna ! trimmer Repeat steps 2, 3 and 4 until no further improvement is obtained. Alwaysstop on step 4. NOTE 1. Use a 6-to-8-turn, 6-inch-diameter-loop made up of insulated wire. Connect to generator terminals, and place about one foot from radio loop 111 收音机爱 好者资料库 RadioFans.CN