Philco-Radio-and-Television-Corp-ST984 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN 33 MODEL ST984 (Continued from preceding page. ) Bottom View-Perma Circuit Panel Component Layout-Model ST984 INTERMEDIATE FREQUENCY: AM, 455KHz FM ALIGNMENT FMj 10.7MHz SIGNAL GENERATOR RADIO STEP CONNECTION TO RADIO DIAL SETTING DIAL SETTING SPECIAL INSTRUCTIONS ADJUST 1 CO

2、LLECTOR OF Q1 THRU 01 MF CAPACITOR 10.7 MHZ 75 KHZ SWEEP TUNING GANG FULLY OPEN ADJUST FOR MAXIMUM OUTPUT IN ORDER GIVEN. REDUCE GENERATOR OUTPUT A5 NECE5S. T9A, T7, T5 ft T 4 2 5AME AS STEP 1 10.7 MHZ 30% AM TUNING GANG FULLY OPEN ADJUST FOR MINIMUM OUTPUT (A NULL BETWEEN TWO PEAKS) T9B 3 REPEAT ST

3、EPS 1 AND 2 UNTIL NO FURTHER IMPROVEMENT IS OBTAINED. 4 CONNECT TO ANTENNA TERMINAL THRU 47 OHM RESISTOR 87.5 MHZ 75 KHZ TUNING GANG FULLY CLOSED ADJUST FOR MAX. OUTPUT. T3 (SEE NOTE “A) FM OSC 5 SAME AS STEP 4 108 5 MHZ 75 KHZ TUNING GANG FULLY OPEN ADJUST FOR MAX. OUTPUT. VCTB FC OSC. 6 REPEAT STEPS 4 AND 5 UNTIL NO FURTHER IMPROVEMENT IS OBTA INED. 7 SAME AS STEP 4 90MHZ 75 KHZ 90 MHZ ADJUST FOR MAX OUTPUT. T2 e SAME AS STEP 4 105 MHZ 7S KHZ 105 MHZ ADJUST FOR MAX. OUTPUT. VCT A 9 REPEAT STEPS 7 AND 8 UNTIL NO FURTHER IMPROVEMENT IS OBTAINED. 95 收音机爱 好者资料库 RadioFans.CN