Packard-Bell-Co-5R5 电路原理图.pdf

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1、VOLUME R-19, MOST-OFTEN-NEEDED 1959 RADIO SERVICING INFORMATION PACKARD BELL TABLE MODEL RADIO 5R5 DC RESISTANCE MEASUREMENTS 1st l-F Coil: Primary, 19 ohms Secondary, 19 ohms 2nd l-F Coil: Primary, 19 ohms Secondary, 19 ohms Oscillator Coil: Primary, 1 ohm Secondary, 10 ohms Socket voltages measure

2、d as follows: 1. Line voltage, 117 volts AC. 2. Volume control at maximum. 3. VTVM between socket terminal and B minus bus. 4. Only DC voltages measured. Allow 10% tol erance. ALIGNMENT PROCEDURE: The alignment of the set is accomplished by fol lowing the steps in the chart below. Connect output met

3、er to speaker voice coil. Use isolation transformer, if available, for shock protection. Each adjustment should be made using a minimum input signal. Connect oscillator through a .01 mfd capacitor in step one; loose-couple oscillator ead in steps two and three. cton Connect Test Mep Oscillator To Test Oscillator Frequency Radio Dial Setting Adjust 1. Pin 1, V-l (12BE6) 455 Kc. 540 Kc. S-l, S-2, S-3, & S-4 for MAX. 2. Loose-couple to antenna 1620 Kc. 1620 Kc. C-2B for MAX. 99 3. ditto 1500 Kc. Tune to C-lBforMax. Osc. Signal 收音机爱 好者资料库 RadioFans.CN