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林肯控制板维修实例分享,维修上海林肯POWERPLUS II 500气保焊机控制板,更换CPU。

最近接修一批林肯气保焊机控制板,多数故障简单,修复容易,但其中一个板子故障比较特别,所以发出来分享下。

该板应用于上海林肯生产的POWERPLUS II系列可控硅气保焊机,350,500,650三种机型通用,依靠焊机上设计的跳线插到控制板上实现机型的自动选择。

控制板多数器件使用贴片,电容和电阻等体积大的器件为直插件。整板全部使用5mm左右厚度的透明树脂进行了密封,要去除密封层进行测试和维修难度比较大,需要一定的技术和设备。

维修流程如下,照片在后面:

1、收到客户发来的板子先测试外围,确认电源输入等关键回路没有短路现象,然后通电试机,控制板不能自检,不能启动机器,机器异常指示灯亮。

2、测试板上+15V,-15V,-10V,+5V等电源均过低或没有,检查开关电源电路,未发现有器件损坏,看波形判断为后级电路有短路导致开关电源电流过大进入保护状态。

3、查后级用电器件,发现CPU X4位置隔着5mm厚密封胶都有明显温度,怀疑该颗芯片可能有故障。

4、去除CPU处覆盖的保护树脂,手触CPU封装,烫手,明显超过其正常工作温度。该颗CPU为美国赛普拉斯生产的CY8C29866,96个引脚,在这个板上的作用是控制焊接逻辑以及产生SCR驱动脉冲。正常工作时温升很低,无需专门的散热装置,自然散热即可。现在温度异常,怀疑其已经损坏。

5、使用热风枪吹掉该颗芯片,清理安装位置残留的密封胶、焊锡等杂物,在引脚位置镀锡,无水酒精洗干净,吹干。

6、安装新的CY8C29866芯片到原位置,热风枪加热焊好,用放大镜检查每一个焊脚是否焊实并确认没有短路。

7、再次通电,测试板上开关电源的所有供电输出,确认全部正常。此时机器仍然不能启动,因为新更换的CPU内还没有写入程序。

8、将板子连接上程序读写器并通过USB与电脑连接,重新烧写程序,写完后重启控制板,机器电流电压表显示刚才烧写的程序版本,正常自检并启动。

9、测试控制板各项输入输出功能,确认正常,试机焊接正常,重新密封CPU位置的树脂,维修完成。

有该类型控制板需要维修的朋友可以联系我微信hu326312074.                                                                                                                                                                                                                                                                                                                                                                                                                                    

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

                                                                                                                                                                                                                                                                                                                                                                                                                                                                 

                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

 

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

  

全部回复(5)
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新月GG
LV.9
2
2017-07-25 08:09
路过
0
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2017-08-07 21:45
@新月GG
路过
LZ哪里来的程序????
0
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2018-07-02 18:59
@chenxianning
LZ哪里来的程序????
可以请厂家的人帮忙刷程序啊,有关系没难事!
0
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yyh51
LV.4
5
2018-07-05 08:49
不错,很是专业!!学习了!!
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yingjieso
LV.5
6
2020-01-27 21:11
牛逼的楼主
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