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1 开机无扫描线也无光点无扫描线但可看到电子管灯丝都亮。因关机瞬间也无亮点,可考虑与高压变换电路有关。检修时测高压只几伏,为杂散感应电压。检查15V 电源达17V,从示波管下边屏蔽盒里断开高压包,测高压包内部断路不通,从卸掉的高压包表面看有凹坑缺陷,加之电源偏高而烧坏。换上新的高压包,并调节取样电位器使电源电压为15V,装好开机出现亮的扫描线。
1 boot no scan line no light spot without scanning line but you can see the tube filament is bright. Because there is no bright spot shutdown, can be considered with the high-voltage conversion circuit. Overhaul when measuring high pressure only a few volts, as stray induced voltage. Check the 15V power supply up to 17V, disconnect the high-voltage package from the shielding box below the oscilloscope, and check the internal circuit of the high-voltage package is faulty. Depression defects are seen from the surface of the unloaded high voltage package, combined with the high power and burnout. Put a new high-pressure package, and adjust the sampling potentiometer so that the power supply voltage is 15V, installed bright boot line scan line.