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4.6.2 Heat sink-Contact 散热片――接触片
arget-Class 1,2,3 目标——等级 1,2,3
· Component and heatsink are in full contact
with the
mounting surface.
组件和散热片与安装表面完全接触
· Hardware meets specified attachment requirements.
部件满足规定的接触要求。
Figure图4-64 1. Heat sink
散热片
Acceptable-Class 1,2,3
可接受的——等级 1,2,3
· Component not flush.
组件不平齐
· Minimum 75% contact with mounting surface.
至少有75%与安装表面接触
· Hardware meets mounting torque requirements
if
specified.
如果有规定,部件满足安装的转距要求
Figure图4-65
1. Gap 2. Heat sink 间隙散热片 Defect-Class 1,2,3
.
缺点——等级 1,2,3
· Component is not in contact with mounting surface.
组件没有接触到安装表面
· Hardware is loose and can be moved.
部件松弛可以移动。
Figure图4-66
1. Heat sink 2. Gap 散热片间隙
5.1 Orientation
方向
5.1.1 Orientation-Horizontal
方向——水平
Target-Class 1,2,3 目标——等级 1,2,3
•Components are centered between their lands. 组件位于焊盘中央
•Component markings are discernible. 组件标识清晰可见
•Nonpolarized components are oriented so that markings all read the same way (left-to-right
or top-to-bottom).
Figure图5-1 无极性组件的方向应使其标识都能按同样方式
进行辨识
(从左到右或从上到下)
.
Acceptable-Class 1,2,3 可接受的——等级 1,2,3
•Polarized and multilead components are oriented correctly.
有极性和多引脚的组件应按正确方向安装。 •When hand polarization
symbols are discernible.
当手工成型与手插件时,极性符号可以辨识。
•All components are as specified and terminate to Figure图 5-2 correct lands.
所有组件都符合规定并连接到正确的焊盘上。
•Nonpolarized components do not need to be oriented so that markings all read the same way(left-to right or top to-bottom). 无极性的组件不需要按同样的方向,只要标识可按相同方向辨识即可(从左到右或从上到下).
5.1.1 Orientation-Horizontal(cont.)
方向——水平(续)
formed and hand-inserted,
Defect-Class 1,2,3 缺点——等级1,2,3
•Component is not as specified (Wrong part). 组件不符合规定(组件错误)
•Component not mounted in correct holes. 组件没有安装在正确的孔中。
•Polarized component mounted backwards. 有极性组件安装方向相反。
•Multileaded component not oriented correctly.
Figure图 5-3 多引脚组件的安装方向不正确。
5.1.2 Orientation-Vertical
.
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