论文部分内容阅读
一台友谊JD16-2电视机无光无声,经初步检查是行停振。进一步检查行振荡级和行鉴频级各元器件没有发现问题。于是决定减小3R_9阻值,提高行振荡级工作点电流,使其易于起振,结果无济于事。再测振荡管3BG_2各级电压,发现基极和发射极电压一样高(均12V),集电极电压为零。显然是管子截止造成停振。测3R_8两端电压,左端高于右端,说
A friendship JD16-2 TV silent, the initial check is the line stop vibration. Further examination of line oscillation level and line frequency level of the components did not find any problems. So decided to reduce the 3R_9 resistance, raising the row oscillation level operating point current, making it easy to start-up, the result does not help. Then measure the voltage of the oscillating tube 3BG_2 at all levels and find that the base and emitter voltages are as high (both 12V) and the collector voltage is zero. Obviously caused by the deadline stop tube vibration. Measure the voltage across 3R_8, left above the right, say