在中高档收录机的轻触型机芯中(如夏普GT—800、富华GT—800、乐峰GF—800等),当使用年久后,会出现一种特殊故障。按下放音键后,键虽能锁住,但放音磁头上升到位后,立即跌落下来,机器无法放音。快进、快倒功能始终正常。造成此故障的根本原因是,在机芯的塑料底板上有一与其整体注塑而成的微小桩桩断裂。该桩柱断裂后引起限位担簧失去作用,使其跳步摆板无法支撑住锁定杆,进而销定杆就无法限制住定时齿盘。所以压带轮靠不上主导轴,收带轮自然不转。磁头滑板上升到位后不能锁定,最终跌落下来。该桩柱的断裂主要是因原设计工艺欠佳,其桩柱根部只有很少的一点塑料体与底板相连。所以日久无法承受扭簧产生的强大拉力。原 In the high-end tape recorder touch-type movement (such as Sharp GT-800, Fu-wah GT-800, Lefeng GF-800, etc.), when used for a long time, there will be a special failure. Press the play button, although the keys can be locked, but playback head up in place, immediately fell down, the machine can not play. Fast forward, fast down function is always normal. The root cause of this failure is the fact that there is a break in the plastic floor of the movement with the tiny piles molded integrally with it. After the pile rupture caused by the loss of limit spring, making it can not support the jump pendulum lock lever, and then pin can not limit sales on the timing gear. Therefore, pressing the wheel can not rely on the main shaft, take the pulley naturally does not turn. The head skateboard can not be locked when it is in place and eventually falls. The breakage of the pile is mainly due to the poor original design process, with only a few plastic bodies at the root of the pile connected with the floor. Therefore, a long time can not afford to produce strong torsion spring tension. original