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标题: 惠普M281fdw报错50.2，换二手拆机定影后问题依旧，是主板还是高压板问题 [打印本页]

作者: u1615278 时间: 昨天 22:10
标题: 惠普M281fdw报错50.2，换二手拆机定影后问题依旧，是主板还是高压板问题
惠普M281fdw彩色激光一体机。客户描述前一天晚上关机还正常，第二天开机就报错50.2（定影预热故障），机器预热有轻微的转动声，但没转几秒直接报错，无法工作。
先从最简单的入手，拆下后盖测量定影灯管两端阻值，正常（约几欧姆）。目测热敏电阻和恒温器没有明显烧焦或变形。插回主板的定影排线，开机依然报50.2。

同行店里刚好有一台废旧机器，拆了一个确认好的二手拆机定影组件换上，满心欢喜以为能秒杀，结果开机还是报50.2。这个时候心里有点发毛了。

重新插拔主板和电源板连接定影的所有排线，用万用表测量定影接口的供电电压，发现开机瞬间有24V跳变，随后很快掉为0V。怀疑是不是电源板带载能力差，或者是主板检测到异常切断了供电。
惠普M281fdw换了定影还报50.2，是不是电源板给定影供电的24V出问题了？怎么用万用表量主板定影接口的输出电压或者反馈信号
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