论文部分内容阅读
例1:一台孔雀KQ51—39型彩电更换管座后,忘记插上显像管尾板上的地线。开机后,听见“叭”的一声,出现无图像无伴音、键控和遥控均失灵。插上地线后,对中心微处理器M491各脚电压测量,均与正常值有较大的差别,更换后,机器工作恢复正常。例2:一台夏普C—1405CK型彩电开机后出现图声胀缩故障。此机已使用多年,电源部分许多元件的焊点似连非连,认为该故障为元件脱焊引发。在对元件进行补焊时,没小心注意,烙铁头使C745与R707两个焊点瞬间相碰,“叭”的一声,IC701(IX0308)/ZD702、
Example 1: A Peacock KQ51-39 color TV After replacing the tube socket, forget to plug in the picture tube tail ground. After booting, I heard “loud” sound, there is no picture without sound, key and remote control are malfunctioning. Plug in the ground, the center of the microprocessor M491 voltage measurement of each foot, with the normal there is a big difference, after replacement, the machine back to normal work. Example 2: A Sharp C-1405CK-type TV after power figure figure expansion and contraction problems. This machine has been used for many years, many parts of the power part of the solder joints seem to be non-connected, that the failure of components caused by de-soldering. In the component welding, did not pay attention to the tip of the C745 and R707 instant welding two clumps, “loud” sound, IC701 (IX0308) / ZD702,