柯美C368色彩套准失败，转印带和IDC全换，对比主扫描同步信号与电机编码器发现相位...

会员1615278

柯美C368彩机。打印出来的彩色图像，红蓝绿边缘全部错位，不是那种轻微的套色不准，而是直接错开了两三毫米，甚至方向都不固定。
常规排查：

更换了转印带总成,连带清洁了里面的所有张力辊。

清洁了IDC（图像浓度传感器）和ID传感器。

进维修模式做“色彩对位（Color Registration）”，连续做了五次，全部报错（提示对位失败）。

我怀疑这已经不是单纯的传感器脏污了，而是激光曝光的“时序”完全乱了。

卡纸法检查：在纸张经过转印带时强制停机，观察转印带上的碳粉图像，发现不同颜色成像在转印带上时，就已经错位了。

拿出示波器。探头1挂在主板的图像同步信号（HSYNC）测试点上；探头2挂在驱动转印带的BLDC主电机的编码器反馈端（通常是A相）。

正常情况下，HSYNC信号必须与编码器信号的相位严格锁定。但我发现，在打印过程中，编码器信号的上升沿抖动极其严重，导致相位差一直在变。主板因为无法捕捉到稳定的位置信号，导致四个颜色的激光器在发光时，起始位置全在漂移。


这种情况，是主电机（BLDC）内部的霍尔元件老化，导致换相延迟，编码器信号失真了

还是主板上负责锁相的PLL（锁相环）电路芯片热稳定性不良

有没有人遇到过柯美这种“按了复印键，电机才抖动”的故障？如果换主电机总成，这台机器的成本就上万了。能不能单独拆解电机，更换里面的编码器码盘或者霍尔IC？求修过底层驱动的大佬指路！weibo.com/ttarticle/p/show?id=2309405356450070528005
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