一、故障现象及鉴别方法1.衰老。显像管长期使用后,阴极发射率低,使电流减小,造成光栅暗淡。显像管衰老后,光栅暗淡,开机时光栅要较长时间才能出现,加大亮度会出现负像以及散焦等。检修时通常测量栅极和阴极之间的电阻值,来大致判断管子的发射能力。用万用表的正表笔 First, the symptoms and identification methods 1. Aging. After long-term use of the CRT, the cathode emission rate is low, the current decreases, causing the grating dim. CRT aging, the grating dim, boot grating to a longer time to appear, increase the brightness will appear negative and defocus. Maintenance is usually measured between the gate and the cathode resistance, to roughly determine the launch of the tube capacity. With a multimeter positive pen