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故障现象:开机图声正常,但图像不时有干扰杂波,干扰出现时图像清晰度降低。分析检修:这类故障多发生于延迟线亮度轮廓校正电路,该机相关电路如附图所示。其中DL303、DL304为延迟线,Q309和Q310组成加减法运算器。由前级送来的亮度信号经Q307发射极跟随输出,一路经R333、R334分压后加至Q310倒相放大后输出,与Q309集电极信号进行加减运算;另一路经R324、DL303由Q308发射极输出再次分成两
Symptom: boot sound is normal, but the image from time to time interference clutter, interference appears to reduce the clarity of the image. Analysis and maintenance: This type of failure occurred in the delay line brightness contour correction circuit, the aircraft related circuits as shown in the figure. Which DL303, DL304 for the delay line, Q309 and Q310 addition and subtraction algorithm. The luminance signal sent by the previous stage is followed by the Q307 emitter follow-up output, all the way through the R333, R334 partial pressure added to Q310 inverting amplified output, and Q309 collector signal addition and subtraction operations; the other way through the R324, DL303 from the Q308 The emitter output is split again into two