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一台广州牌HB44—20型17时黑白电视机显像管灯丝烧断,用一只次品显像管换上后,对比度、亮度控制均正常,就是聚焦稍差一些。该机显像管聚焦极第⑦脚保留了接第⑥脚和接地两种选择方式,当该脚接地时,聚焦效果优于接第⑥脚
A Guangzhou brand HB44-20 17:00 black and white TV picture tube lamp blown, replaced with a defective picture tube, the contrast, brightness control are normal, is slightly less focused. The focal point of the tube kinescope ⑦ feet to retain the second ⑥ foot and ground access to the two options, when the foot of the ground, the focus is better than the first ⑥ foot