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例一放像带不能入带仓接通电源后,红指示灯亮,放像机启动后,指示灯能熄灭,可转为AUTO与PALY指示,说明系统控制电路的工作基本正常。放像带插入带仑,被卡住,检查发现入盒电机不运转,进而察看机械传动部分,各齿轮定位标记均正确。为证明机械部分正常,采用手动模拟入仓,加载动作,工作正常无误。拆下入盒电机机座,用数字万用表R×1Ω档并接电机插头两端,电机能够正常旋转,故分析故障可能在驱动电路集成块IC602,卸下机芯发现IC602(TA7291)塑封表面已有烧裂痕
Example of a tape can not enter the warehouse after the power is turned on, the red indicator light, the player starts, the light can go out, can be converted to AUTO and PALY instructions that the basic work of the system control circuit. Put the tape into the band with Lun, was stuck, check the box into the motor does not run, and then look at the mechanical transmission part, the gear positioning mark are correct. To prove the normal part of the machinery, the use of manual simulation warehousing, loading action, work properly. Remove the motor box into the box, with a digital multimeter R × 1Ω file and then plug the motor ends, the motor can rotate normally, so the analysis of the failure may be in the driver IC block IC602, remove the movement found IC602 (TA7291) There are burning cracks