论文部分内容阅读
例1:东芝2999UXE彩电,光栅与图像正常,但无伴音。分析与检修:开机检测伴音电路36V、30V供电端均为0V,怀疑音频开关电源有问题。该机为了保证大功率的音频输出及高品质的音响效果,设计应用了单独的音频开关电源(电路原理见图1),为伴音电路供电。检查音频电源电路部分,发现保险丝管F803烧黑,说明机内存在严重的短路现象,围绕烧保险丝的常见原因,继续检查电源电路,发现厚膜集成电路Q803
Example 1: Toshiba 2999UXE color TV, grating and the image is normal, but no sound. Analysis and Maintenance: Power-on detection circuit 36V, 30V power supply side are 0V, suspected audio switching power supply problems. The aircraft in order to ensure high-power audio output and high-quality sound effects, the design and application of a separate audio switching power supply (circuit principle shown in Figure 1) for the audio circuit power supply. Check the audio power supply circuit and found that the fuse tube F803 burn black, indicating a serious short circuit within the machine, around the common cause of burning fuse, continue to check the power circuit found thick film integrated circuit Q803