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'空压机,在,焊接,进程,中,须要,留意,的,要点,'

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'<p><strong>1.调换年夜规模集成电路的轻便方式</strong></p><p>调换空压机破坏的集成电路是一项十分艰巨的事情，尤其是从多层印制电路板上摘 取它们时，经常会破坏电路的内层接点或纤细的引线。</p><p>现先容一种轻便、实用的检验方式。 调换多引脚的芯片可按图1-32所示的方式入行，即先用小刀或锐锉把芯片 的脚截断。</p><p>集成电路的引脚望似粗壮，实在外层裹着厚厚的焊锡，铜引脚是很薄 的，用小刀往返划上一二十下就断开了。</p><p>往失已经破坏的芯片，再用小铰剪修齐 残留在印刷板上的引脚。把一个与芯片相配的插座脚对脚，同残根焊在一路。</p><p>为了焊得整洁些，先把对角线上四条脚焊好，再用小镊子扶正其余的脚，将它们一 一焊上，装上新芯片，检验事情就告收场。</p><p>采取上述调换芯片检验方式时的留意事项如下:</p><p style="text-align: center;"><img alt="空压机芯片更换" src="2018/1228/1782.jpg" /></p><p>(1).切勿把引脚从印制板上拔出，因内层焊点和引线都极懦弱，万一受到毁伤就无法修复了;</p><p>(2).为了避免 烙铁的泄电或静电破坏其他留在板上的芯片，较好每次都堵截烙铁电源，用烙铁 头上的余暖焊接插座与残根(用上述方式调换上新的芯片后，增添了一个插座的 高度);</p><p>(3).对一些入口高等仪器的补缀，不克不及采取此法，必定要用吸锡器拆下集 成电路，使仪器构造不转变。</p><p><strong>2.焊接集成块时要求电烙铁接地，以防破坏集成块</strong></p><p>电烙铁接地不仅可以防止泄电所造成的迫害，还能使静电感应发生的电荷或 电路中的异常电荷实时传导到年夜地。</p><p>电烙铁接地就是将电烙铁的金属外壳引出线(a)中的地线]， 经由过程单相三线插头中中间较长的铜片(插脚)，接到电源插座(单相三眼) 的接地(接零维护线) 插孔。</p><p>假如所用电烙铁没有地线引出线，可以采用焊接集成块时拔下电烙铁的电源插 头，应用余暖焊接的方式。</p><p><strong>3.经由搪锡或镀锡处置的元器件引脚仍易泛起虚焊</strong></p><p>经由搪锡或镀锡处置的元器件引脚，仍容易泛起虚焊的缘故原由如下:</p><p>1.锡层的外貌常附有一层氧化物，在采用锡钎焊对引脚入行焊接时，若不消机器抛光的 方式或用杰出的助焊剂将此氧化层肃清，则容易造成虚焊;</p><p>2.对付镀锡铜质引脚，处置进程中的高温以及持久寄存等缘故原由，可能在铜与锡界面发生CugSns 合金层，这一合金可焊性极差，容易泛起虚焊。</p>'

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'空压机在焊接进程中，须要留意的要点有哪些？_维修保养_技术中心_复盛空压机(华北)总代理'

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