SMT 缺陷.pdf - 第21页
38 Countermeasure/ 对策 1. Wrong placement machin e program : Check and correct the machine program. 贴片机程序错误 : 检查和更正机器程序 2. Manual placement in reverse direction: 手工放置元件错误 a) Avoid manual placement components 避免手工放置元件 b) N…
9、元件错(COMPONENT FAULT)
9 元件少放、放错、极性错等现象
¾ 贴片程序
¾ 贴片机
元件面方向错
元件放错
STENCIL对SMT工艺的影响
2-2、常见SMT工艺缺陷分析:
38
Countermeasure/ 对策
1. Wrong placement machine program : Check and correct the machine program.
贴片机程序错误: 检查和更正机器程序
2. Manual placement in reverse direction: 手工放置元件错误
a) Avoid manual placement components 避免手工放置元件
b) Need special inspection for the manual placement prior to reflow (document control).
炉前需要特别检查那些手工放置的元件 (文件控制)
3. Disordered orientation in the tray/reel of the incoming material:
卷装或盘装来料元件的不规则放置．
a) Inspect before loading it to SMT.
上料前检查来料
b) Feedback to vendor to take corrective actions.
反馈给供应商采取改善行动
Wrong Orientation/Polarity
Wrong Orientation/Polarity
反向
反向
,
,
极性反
极性反
30
No Solder
No Solder
/
/ 无锡
No solder to the land or termination where solder
is required.
焊点无锡