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录象机电源集成块损坏的应急修理故障现象:G30型录象机插上电源后时钟不显示,不能装盒,用手插入带盒后按任何键都不起作用。分析检修:从现象分析电源故障可能性最大,打开盖查STK5338的15.8V、8.6V、23.0V三组输入电压正常,但无5.8V和5.1V稳压输出,使微处理器等无工作电压,造成时钟不显示。把STK5338的②、③脚与外电路断开,再通电测量②、③脚仍无电压输出,说明STK5338内部损坏。
Video Recorder power supply block damaged emergency repair Fault phenomenon: G30 type video recorder plugged in the power supply clock does not display, can not be loaded box, insert any key by hand after the box does not work. Analysis and Maintenance: From the phenomenon of the greatest possibility of power failure analysis, open the lid check STK5338 15.8V, 8.6V, 23.0V three groups of normal input voltage, but no 5.8V and 5.1V regulator output, so that no operating voltage microprocessors , Resulting in the clock does not show. The STK5338 ②, ③ feet and the external circuit is disconnected, then the power measurement ②, ③ feet still no voltage output, indicating STK5338 internal damage.