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一、图像向下翻滚故障现象:开机20s内,图像、伴音、色彩均正常,20s后,图像开始向下翻滚,偶而图像也能瞬间稳定,调节场频电位器无效。检修过程:由故障现象分析,图像瞬间能稳定,说明场振荡部分基本正常,故障在场同步分离电路,故测场同步分离电路。首先检测场同步分离电路,测量V_(411)及场同步分离管V_(660)各脚电压及D7698AP的第(?)脚电压与外围电路元件均正常。
First, the image down the roll Fault phenomenon: boot 20s, the image, sound, color are normal, 20s, the image began to roll down, and occasionally the image can be instantly stable, adjust the field frequency potentiometer is invalid. Maintenance process: From the phenomenon of fault analysis, the image can be instantly stable, indicating that the basic part of the normal field oscillation, fault synchronization in the field of separation circuit, so the measured field synchronization separation circuit. First of all, the field synchronous separation circuit was tested. The voltages of V_ (411) and V_ (660) and the voltage of the D7698AP pin were measured and the peripheral circuit components were normal.