论文部分内容阅读
例1 机型:日立CTP—236D型彩电故障现象:彩色暗,且收不到图像。分析检修:接收电视信号,把色饱和度调至最大,屏幕上只呈现很暗的大面积彩色区,且黑白图像也不能显示,伴音正常。调亮度钮,亮度能变化,但亮度不够。怀疑亮度通道有故障。从第三视放Q_(303)逐级往前检查,Q_(303)、Q_(302)均正常。将色饱和度关小,在Q(303)b极注入信号,屏幕有杂波反应;在Q_(302)c、b极注入信号也均有反应,说明这以后电
Example 1 Model: Hitachi CTP-236D color TV Fault phenomenon: dark color, and can not receive images. Analysis and maintenance: receiving TV signals, the color saturation to maximum, the screen presents only a very dark large color area, and black and white images can not be displayed, the sound is normal. Brightness button, the brightness can change, but the brightness is not enough. Suspected brightness channel is faulty. From the third visual playback Q_ (303) progressive inspection, Q_ (303), Q_ (302) are normal. The color saturation is small, the Q (303) b pole into the signal, the screen has a clutter reaction; in the Q_ (302) c, b pole injection signals are also reacted, indicating that after the power