电子技术论坛

 找回密码
 快速注册

QQ登录

只需一步,快速开始

搜索
下载方法|用单线程|避免多扣帖子规范|求助必读|发帖建议积分策略|勋章介绍|新人必读获取金币|推广论坛|出售帖子基本礼节|致会员信|版规总则
禁涉政治|反对低俗|举报专帖征集相片|留下足迹|推荐精华上传附件|制作分卷|使用网盘禁发qq群|恶意灌水|纯表情帖加入团队|监督机制|安全上网
查看: 13917|回复: 12

[电磁炉] 三洋F18电磁炉维修手册

[复制链接]
发表于 2005-11-21 07:05:23 | 显示全部楼层 |阅读模式

注册家电维修技术论坛,与同行畅聊维修技术,享更多技术论坛功能。

您需要 登录 才可以下载或查看,没有帐号?快速注册

x
<  align=center><B>三洋</B><B><FONT face="Times New Roman">IC-F16(SM)</FONT></B><B>型电磁炉</B><B><p></p></B></P>
< ><FONT face="Times New Roman"> <p></p></FONT></P>
< ><FONT face="Times New Roman"> <p></p></FONT></P>
< ><FONT face="Times New Roman"> <p></p></FONT></P>
<  align=center><B>维修服务手册</B><B><p></p></B></P>
<  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P  align=center><B>大连三洋家用电器有限公司</B><B><p></p></B></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><STRONG><FONT face="Times New Roman" size=6>2003.9.28</FONT></STRONG></P>
<P  align=center><STRONG><FONT face="Times New Roman"> <p></p></FONT></STRONG></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P  align=center><B>目录</B><B><p></p></B></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><B>一.            </B><B>电磁炉工作原理简介</B><B><p></p></B></P>
<P ><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><B>二.            </B><B>电磁炉主要环节原理说明</B><B><p></p></B></P>
<P ><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><B>三.            </B><B>整机原理框图</B><B><p></p></B></P>
<P ><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><B>四.            </B><B>电磁炉内部结构</B><B><p></p></B></P>
<P ><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><B>五.            </B><B>故障检查流程</B><B><p></p></B></P>
<P ><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><B>六.            </B><B>维修方法及注意事项</B><B><p></p></B></P>
<P ><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><B>七.            </B><B>故障检查流程图</B><B><p></p></B></P>
<P ><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><B>八.            </B><B>原理图</B><B><p></p></B></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P  align=center><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><B>一.            </B><B>电磁炉工作原理简介</B><B><p></p></B></P>
<P >电磁炉工作原理是基于电磁感应加热的原理。由于电磁炉没有明火,所以从安全性角度出发他优于电阻丝加热和燃气加热,不容易引起火灾或瓦斯中毒的危险。它的基本原理是先将交流电变成直流电,随后再将直流电变成高频交流电(即<FONT face="Times New Roman">AC-DC-AC</FONT>变换技术)高频交流电的频率通常在<FONT face="Times New Roman">20KHZ~30KHZ</FONT>之间,我们再把高频交流电送入一扁平的线盘,使之产生高频交流磁场。如果我们把铁磁性的锅子置于该磁场中间,那么磁场就会在锅底产生涡流而产生热量将锅底加热。显而易见前提是锅底本身必须由不锈钢或铁制成。由于发热只能在锅底产生,不会将周围空气加热因此热效率明显高于用明火加热的方式。<p></p></P>
<P >微电脑电磁炉是在控制电路中加入了主控<FONT face="Times New Roman">CPU</FONT>芯片,使电磁炉使用更为方便可靠。如<FONT face="Times New Roman">CPU</FONT>芯片可以很圆满的完成过电压,过电流,过热,定时,恒功率加热,以及大功率开关元件的保护等功能。<B><p></p></B></P>
<P  align=left><B>二</B><B><FONT face="Times New Roman">.</FONT></B><B>电磁炉主要环节原理说明</B><p></p></P>
<P  align=left><FONT face="Times New Roman">1</FONT>.输入部分<p></p></P>
<P  align=left>即前面所述的<FONT face="Times New Roman">AC-DC</FONT>转换部分。在此包括输入熔断器,过电压保护用压敏电阻器(<FONT face="Times New Roman">Varistor</FONT>)<FONT face="Times New Roman">,EMC</FONT>抑制电路,整流器,<FONT face="Times New Roman">20~30KHZ</FONT>脉冲抑制电路等。<p></p></P>
<P  align=left><v:shapetype><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path connecttype="rect" gradientshapeok="t" extrusionok="f"></v:path><lock aspectratio="t" v:ext="edit"></lock></v:shapetype><v:shape><v:imagedata></v:imagedata></v:shape><p></p></P>
<P  align=center>(图一)<p></p></P>
<P  align=left><FONT face="Times New Roman">    </FONT>压敏电阻器<FONT face="Times New Roman">ZMR</FONT>主要用以防止过高的浪涌电压进入电磁炉造成炉子损坏,通常选用<FONT face="Times New Roman">430~470V</FONT>等级的电压。一旦发生电网上存在浪涌电压(如雷击或断开电感性负载时很容易在电网上产生浪涌)时压敏电阻就会将这部分能量消耗掉,甚至会由于通过压敏电阻的大电流将熔断器烧坏而断电源。<p></p></P>
<P  align=left>图一<FONT face="Times New Roman">CM,C112,C102</FONT>构成共模噪声抑制电路,它可以防止<FONT face="Times New Roman">DC/AC</FONT>逆变过程中产生的干扰信号进入电网,也可以防止电网对地的干扰信号进入电磁炉,在必要时还可以在<FONT face="Times New Roman">A</FONT>和<FONT face="Times New Roman">B</FONT>点内在串入两只电感线圈用以抑制差模干扰。<p></p></P>
<P  align=left><FONT face="Times New Roman">L109</FONT>和<FONT face="Times New Roman">C113</FONT>主要用以滤在<FONT face="Times New Roman">20~30KHZ</FONT>的高频交流而并非<FONT face="Times New Roman">50HZ</FONT>整流后的滤波电容,所以要求<FONT face="Times New Roman">C113,C103</FONT>本身的串联电感要求尽可能小。所以不可以使用普通的电介质电容器。由于通过<FONT face="Times New Roman">L109</FONT>的电流中除了<FONT face="Times New Roman">20~30KHZ</FONT>的高频外,还有相当大的直流电流分量,此直流分量会使电感的铁芯迅速饱和,这就会使铁芯的<FONT face="Times New Roman">u</FONT>值大幅下降,使<FONT face="Times New Roman">L=0</FONT>。所以<FONT face="Times New Roman">L109</FONT>所用的材料必须是带有大氧隙的硅钢片或铁粉压或磁芯绝对不可以用环形缺氧体铁芯。<p></p></P>
<P  align=left><FONT face="Times New Roman">2</FONT>.逆变部分<p></p></P>
<P  align=left><v:shape><v:imagedata></v:imagedata></v:shape><FONT face="Times New Roman"> <p></p></FONT></P>
<P  align=center>(图二)<p></p></P>
<P  align=center><v:line></v:line><v:line></v:line><v:line></v:line><v:line></v:line><v:line></v:line><v:line></v:line><v:line></v:line><FONT face="Times New Roman">        </FONT>(图三)<p></p></P>
<P  align=left><FONT face="Times New Roman">                                       t                    </FONT><v:line><v:stroke endarrow="block"></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><p></p></P>
<P  align=left><FONT face="Times New Roman"> </FONT>这是电磁炉的心脏部分,现代电磁炉均采用<FONT face="Times New Roman">IGBT</FONT>管作为主攻率开关,为了减小<FONT face="Times New Roman">IGBT</FONT>在开关过程中过大的开关损耗,所以大都利用在<FONT face="Times New Roman">LC</FONT>谐振过零时刻接通或断开<FONT face="Times New Roman">IGBT</FONT>。<p></p></P>
<P  align=left><v:line></v:line>在此<FONT face="Times New Roman">IGBT</FONT>暂且用一个开关来替代,当开关闭合时,由于<FONT face="Times New Roman">C300</FONT>的充电效应由电源供给的电流中有一尖峰(如图三所示)随后电流按<FONT face="Times New Roman">i=u/L*t</FONT>线性增长,在增长过程中当开关断开时,<FONT face="Times New Roman">LC</FONT>就发生振谐,振谐的频率由<FONT face="Times New Roman">f=1/2</FONT>∏√<FONT face="Times New Roman">LC</FONT>所决定<FONT face="Times New Roman">,</FONT>而电压幅值由<FONT face="Times New Roman">LC</FONT>的<FONT face="Times New Roman">Q</FONT>值所决定<FONT face="Times New Roman">.</FONT>可见若<FONT face="Times New Roman">IGBT</FONT>导通时间<FONT face="Times New Roman">t</FONT>不变而锅具却被移去,此时<FONT face="Times New Roman">Q</FONT>值突然上升,会导致<FONT face="Times New Roman">IGBT</FONT>严重的过电压而烧坏。除非在移动锅具的同时减小<FONT face="Times New Roman">IGBT</FONT>的导通时间<FONT face="Times New Roman">t</FONT>以限制进入磁场的能量。否则<FONT face="Times New Roman">IGBT</FONT>肯定被击穿,为了避免这种现象发生,在本控制电路中增设了锅具检测电路,它由<FONT face="Times New Roman">IC5D</FONT>来完成。<p></p></P>
<P  align=left><FONT face="Times New Roman">3</FONT>.电流检测回路<p></p></P>
<P  align=left>传统的电磁炉电流检测大多数都采用电流互感器,如果互感器接在<FONT face="Times New Roman">50HZ</FONT>回路中,则通常用硅钢片做铁芯而串在高频回路则大都用铁氧体作铁芯。<p></p></P>
<P  align=left>由于电流互感器非线性现象比较严重,不能真实反映负载的大小,这里采用电阻采样的方法在<FONT face="Times New Roman">IGBT</FONT>流过峰值电流为<FONT face="Times New Roman">10A</FONT>时在电阻上产生电压降<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape><p></p></P>
<P  align=center>(图四)<p></p></P>
<P  align=left><FONT face="Times New Roman">Vp=0.1V</FONT>,此电压经反向放大器放大至<FONT face="Times New Roman">100A</FONT>左右,即可在<FONT face="Times New Roman">VR</FONT>端获得<FONT face="Times New Roman">10V</FONT>的峰值电压。<p></p></P>
<P  align=left><FONT face="Times New Roman">4</FONT>.<FONT face="Times New Roman">IGBT</FONT>驱动脉冲形成电路<p></p></P>
<P  align=left><FONT face="Times New Roman">   </FONT>本电路主要由<FONT face="Times New Roman">IC5B</FONT>和<FONT face="Times New Roman">IC5C,Q302</FONT>和<FONT face="Times New Roman">Q303</FONT>等构成。<p></p></P>
<P  align=left><FONT face="Times New Roman">   </FONT>初始状态:<p></p></P>
<P  align=left>由于<FONT face="Times New Roman">A</FONT>点电压<FONT face="Times New Roman">UA&gt;B</FONT>点电压<FONT face="Times New Roman">UB</FONT>,因此<FONT face="Times New Roman">IC5B</FONT>的<FONT face="Times New Roman">Pin1</FONT>位低电平。经电容耦合<FONT face="Times New Roman">Pin8</FONT>也为<FONT face="Times New Roman">L</FONT>电平,故<FONT face="Times New Roman">Pin14</FONT>为<FONT face="Times New Roman">H</FONT>高电平,并使<FONT face="Times New Roman">IGBT</FONT>门级<FONT face="Times New Roman">G</FONT>为<FONT face="Times New Roman">H</FONT>高电平,<FONT face="Times New Roman">IGBT</FONT>一直导通。<p></p></P>
<P  align=left>在此期间,<FONT face="Times New Roman">C301</FONT>的充电电流<FONT face="Times New Roman">ic</FONT>对<FONT face="Times New Roman">C301</FONT>充电,于是<FONT face="Times New Roman">Pin8</FONT>电压波形如图六所示变化,当达到<FONT face="Times New Roman">t2</FONT>时<FONT face="Times New Roman">Pin8</FONT>上电位高于<FONT face="Times New Roman">Pin9</FONT>上电位,于是<FONT face="Times New Roman">IC5C</FONT>突然翻转<FONT face="Times New Roman">Pin14</FONT>为<FONT face="Times New Roman">L</FONT>电平,并使<FONT face="Times New Roman">IGBT</FONT>关断。<p></p></P>
<P  align=left>如果增大控制电压<FONT face="Times New Roman">Uc</FONT>,则<FONT face="Times New Roman">t2</FONT>点往右移,也就是说<FONT face="Times New Roman">IGBT</FONT>的门驱动脉冲变宽,致使电磁炉功率增加。<p></p></P>
<P  align=left>电磁炉的启动:<p></p></P>
<P  align=left><FONT face="Times New Roman">SB1</FONT>为启动信号,当<FONT face="Times New Roman">SB1</FONT>为高电平时<FONT face="Times New Roman">Q</FONT>导通,在其集电极上产生负跳变脉冲,此脉冲经<FONT face="Times New Roman">C308</FONT>耦合至<FONT face="Times New Roman">B</FONT>点,使<FONT face="Times New Roman">IGBT</FONT>门级<FONT face="Times New Roman">G</FONT>获得正脉冲与此同时<FONT face="Times New Roman">Q304</FONT>截止,撤销了对<FONT face="Times New Roman">IC5C</FONT>的<FONT face="Times New Roman">Pin14   </FONT>的对地旁路作用。否则<FONT face="Times New Roman">Q304</FONT>是导通的,<FONT face="Times New Roman">IC5C</FONT>的<FONT face="Times New Roman">Pin14</FONT>始终为的电平<FONT face="Times New Roman">IGBT</FONT>就得不到正向触发脉冲。<FONT face="Times New Roman">]<p></p></FONT></P>
<P  align=left>如果发生过电压故障,只要立即撤销<FONT face="Times New Roman">Uc</FONT>就可以关断<FONT face="Times New Roman">IGBT</FONT>。本电磁炉的过电流保护直接由<FONT face="Times New Roman">CPU</FONT>来完成的只要<FONT face="Times New Roman">CURRENT</FONT>的值超过<FONT face="Times New Roman">CPU</FONT>内部的门限制,<FONT face="Times New Roman">CPU</FONT>就自动限制<FONT face="Times New Roman">PWM</FONT>的值来降底控制电压<FONT face="Times New Roman">Uc</FONT>的大小。<p></p></P>
<P  align=left><v:shape><v:imagedata></v:imagedata></v:shape><p></p></P>
<P  align=center>(图五)<FONT face="Times New Roman">   <p></p></FONT></P>
<P ><v:group><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line></v:group><FONT face="Times New Roman">                                       t1  t2<p></p></FONT></P>
<P  align=center><FONT face="Times New Roman">C301</FONT>上的波形<FONT face="Times New Roman">  </FONT>(图六)<p></p></P>
<P ><FONT face="Times New Roman">5.</FONT>电磁炉的功率调节<p></p></P>
<P ><v:shape><v:imagedata></v:imagedata></v:shape><p></p></P>
<P >(图七)<p></p></P>
<P >基本功率设定由面板上的按钮送指令至<FONT face="Times New Roman">CPU</FONT>的<FONT face="Times New Roman">I/O</FONT>口随即<FONT face="Times New Roman">CPU</FONT>送出一串<FONT face="Times New Roman">PWM</FONT>信号,此串脉冲的平均值将转换成<FONT face="Times New Roman">Uc</FONT>控制信号来改变<FONT face="Times New Roman">IGBT</FONT>门极脉冲宽度。图七即为<FONT face="Times New Roman">CPU</FONT>输出<FONT face="Times New Roman">PWM</FONT>信号转换成<FONT face="Times New Roman">Uc</FONT>的实施方案。来自<FONT face="Times New Roman">CPU</FONT>的<FONT face="Times New Roman">PWM</FONT>信号,经<FONT face="Times New Roman">R305,C302</FONT>滤波成直流电;经<FONT face="Times New Roman">IC4D</FONT>构成的正相放大器放大,再经<FONT face="Times New Roman">R402,R401</FONT>分压送至<FONT face="Times New Roman">Uc</FONT>端子。<FONT face="Times New Roman">IC5A</FONT>为过电压保护电路,一旦<FONT face="Times New Roman">IGBT</FONT>的电压达到<FONT face="Times New Roman">1100V,</FONT>比较器输出立即变低电平于是<FONT face="Times New Roman">Uc</FONT>被下拉,<FONT face="Times New Roman">IGBT</FONT>驱动脉冲立即变窄。<p></p></P>
<P ><FONT face="Times New Roman">6</FONT>.<FONT face="Times New Roman">IGBT</FONT>温升过高或线圈盘温升过高的保护。<p></p></P>
<P ><FONT face="Times New Roman">   </FONT>这两项保护均采用<FONT face="Times New Roman">NPT</FONT>热敏电阻检测并将输出信号直接送<FONT face="Times New Roman">CPU</FONT>进行处理。<p></p></P>
<P ><FONT face="Times New Roman">7</FONT>.其他检测信号<p></p></P>
<P ><FONT face="Times New Roman">a)CLK1</FONT>信号<p></p></P>
<P ><v:shape><v:imagedata></v:imagedata></v:shape>(图八)<p></p></P>
<P >本<FONT face="Times New Roman">CLK1</FONT>信号直接取如<FONT face="Times New Roman">50HZ</FONT>电网并经过比较器<FONT face="Times New Roman">IC4D</FONT>整形成方波送往<FONT face="Times New Roman">CPU</FONT>供开机信号<FONT face="Times New Roman">SB1</FONT>过零开启之用。<p></p></P>
<P ><FONT face="Times New Roman">b)</FONT>电网电压测试<p></p></P>
<P >由电阻<FONT face="Times New Roman">R424,R425,R426</FONT>分压成<FONT face="Times New Roman">SYSV</FONT>直接提供<FONT face="Times New Roman">CPU</FONT>,一旦此值超过<FONT face="Times New Roman">CPU</FONT>内门限电压,电磁炉即自动关闭。<p></p></P>
<P ><FONT face="Times New Roman">c)</FONT>定时功能<p></p></P>
<P >由操作面板发出指令,直接送<FONT face="Times New Roman">CPU</FONT>进行开<FONT face="Times New Roman">/</FONT>关机控制。<p></p></P>
<P ><FONT face="Times New Roman">8</FONT>.辅助用电开关电源<p></p></P>
<P ><v:shape><v:imagedata></v:imagedata></v:shape><p></p></P>
<P >本电路为典型的单端反激式开关电源。<FONT face="Times New Roman">VIP12A</FONT>芯片是<FONT face="Times New Roman">ST</FONT>公司生产的单片开关电源芯片其中内含高压<FONT face="Times New Roman">MOSFET</FONT>和控制<FONT face="Times New Roman">IC</FONT>芯片,其最大输出功率为<FONT face="Times New Roman">12W(230V</FONT>输入时<FONT face="Times New Roman">)<p></p></FONT></P>
<P >电压检测采用<FONT face="Times New Roman">TL431</FONT>电压基准,并经<FONT face="Times New Roman">PNP</FONT>管与<FONT face="Times New Roman">VIP12A</FONT>相匹配,其电压输出精度较好。<p></p></P>
<P  align=center><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:shape><v:path arrowok="t"><FONT face="Times New Roman"></FONT></v:path></v:shape><v:line><FONT face="Times New Roman"></FONT></v:line><v:shape><v:path arrowok="t"><FONT face="Times New Roman"></FONT></v:path></v:shape><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:rect><FONT face="Times New Roman"></FONT></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1063">
<P ><FONT face="Times New Roman"> <p></p></FONT></P></DIV></TD></TR></TABLE><v:line><FONT face="Times New Roman" size=3></FONT></v:line><v:line><FONT face="Times New Roman" size=3></FONT></v:line><v:rect><FONT face="Times New Roman" size=3></FONT></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1060">
<P ><FONT face="Times New Roman">EMI</FONT></P>
<P >回路</P></DIV></TD></TR></TABLE><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:shape><v:path arrowok="t"><FONT size=3></FONT></v:path></v:shape><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:shapetype><v:stroke joinstyle="miter"></v:stroke><v:path connecttype="rect" gradientshapeok="t" textboxrect="0,3163,18437,18437"></v:path></v:shapetype><v:shape><FONT size=3></FONT></v:shape><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><B>三</B><B><FONT face="Times New Roman">.</FONT></B><B>整机原理框图</B><p></p></P>
<P ><FONT face="Times New Roman">                              </FONT>保险丝<FONT face="Times New Roman">                                                 </FONT>电感<FONT face="Times New Roman">              </FONT>电热线盘</P>
<P ><v:line></v:line><v:line></v:line><v:line></v:line><v:line></v:line><FONT face="Times New Roman">                      </FONT></P>
<P ><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><FONT face="Times New Roman">                    </FONT>压敏电阻<FONT face="Times New Roman">                                                                                 0.27u</FONT></P>
<P ><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:rect><FONT face="Times New Roman"></FONT></v:rect><FONT face="Times New Roman">                                                                               5u<p></p></FONT></P>
<P ><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><FONT face="Times New Roman">                                                                               </FONT>采样电阻<FONT face="Times New Roman">                          IGBT<p></p></FONT></P>
<P ><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >同步</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P ><FONT face="Times New Roman">IGBT</FONT>过压保护</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >振荡</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:line><v:stroke endarrow="block"><FONT size=3></FONT></v:stroke></v:line><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >输出控制</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >驱动回路</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:line><FONT size=3></FONT></v:line><v:line><v:stroke endarrow="block"><FONT size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT size=3></FONT></v:stroke></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><FONT size=3></FONT></v:line><v:line><v:stroke endarrow="block"><FONT size=3></FONT></v:stroke></v:line><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >开关电源</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:line><FONT size=3></FONT></v:line><v:line><v:stroke endarrow="block"><FONT size=3></FONT></v:stroke></v:line><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P><BR  clear=all>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><FONT face="Times New Roman">            20V<p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >电源检测</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >电网电压检测</P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >锅具检知</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >温度检知</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P  align=center>主控<FONT face="Times New Roman">IC</FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman" size=3></FONT></v:line><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P><BR  clear=all>
<P ><FONT face="Times New Roman">                         <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><B>四</B><B><FONT face="Times New Roman">.</FONT></B><B>电磁炉内部结构</B><B><p></p></B></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><v:shape><v:imagedata><FONT face="Times New Roman"></FONT></v:imagedata></v:shape><p></p></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><B>五、故障检查及排除方法</B><B><p></p></B></P>
<P ><FONT face="Times New Roman">1.   </FONT>通电无任何反应,所有指示灯均不亮。<p></p></P>
<P ><FONT face="Times New Roman">a</FONT>)<FONT face="Times New Roman">.</FONT>检查熔断器是否熔断。<p></p></P>
<P >(1) 若熔断器正常,则检查开关电源。<p></p></P>
<P >甲.            开关电源变压器初级绕组是否开路?<p></p></P>
<P >乙.            <FONT face="Times New Roman">VIPER12A  Pin 8, 7 </FONT>对<FONT face="Times New Roman"> Pin 1, 2 </FONT>是否短路?<p></p></P>
<P >丙.            <FONT face="Times New Roman">+5V</FONT>,<FONT face="Times New Roman"> +20V </FONT>电压输出是否正常。<p></p></P>
<P >丁.            <FONT face="Times New Roman">C111 </FONT>(<FONT face="Times New Roman">10UF/450V </FONT>)两端是否有<FONT face="Times New Roman"> 300V  </FONT>直流电压?<p></p></P>
<P >(2) 若熔断器已烧断,则。<p></p></P>
<P >甲.            检查压敏电阻是否被击穿?<p></p></P>
<P >乙.            检查<FONT face="Times New Roman">IGBT  CE</FONT>间是否短路?<FONT face="Times New Roman"> G</FONT>、<FONT face="Times New Roman">C</FONT>、<FONT face="Times New Roman">E </FONT>间是否导通,如果导通,则拆下<FONT face="Times New Roman">IGBT </FONT>再检查<FONT face="Times New Roman">C113 </FONT>两端电阻,若电阻极小,则<FONT face="Times New Roman">C113 </FONT>已损坏。<p></p></P>
<P >丙.            拆下线盘,检查<FONT face="Times New Roman"> C300 </FONT>是否击穿。<p></p></P>
<P >丁.            检查整流桥是否正常。<p></p></P>
<P >戊.            若一切均正常,则换上熔断器再进行检查。<p></p></P>
<P ><FONT face="Times New Roman">    b&gt;.</FONT>检查所有接插件是否松动。<p></p></P>
<P ><FONT face="Times New Roman">2.   </FONT>更换<FONT face="Times New Roman">CPU</FONT>控制板,如果工作正常则说明原来的<FONT face="Times New Roman">CPU</FONT>芯片可能有问题。<p></p></P>
<P ><FONT face="Times New Roman">3.   </FONT>指示灯均正常,但炉子不加热。<p></p></P>
<P >检查<FONT face="Times New Roman"> R350</FONT>、<FONT face="Times New Roman">R352 </FONT>一连串电阻是否正常?<p></p></P>
<P ><FONT face="Times New Roman">4.   </FONT>用不接地的示波器检查<FONT face="Times New Roman">IGBT </FONT>门极驱动电压波形是否正常,如果没有波形而<FONT face="Times New Roman">Q302</FONT>、<FONT face="Times New Roman">Q303</FONT>发射极上有脉冲波形,则可能是<FONT face="Times New Roman">R317</FONT>开路。<p></p></P>
<P ><FONT face="Times New Roman">5.   </FONT>如果电磁炉因过热而跳开,停机后过一段时间又能正常工作,则须检查风扇是否运行正常?<p></p></P>
<P ><FONT face="Times New Roman">a&gt;.</FONT>检查风扇及其供电控制回路是否正常,风扇插头是否接触良好?<p></p></P>
<P ><FONT face="Times New Roman">b&gt;.</FONT>用外接<FONT face="Times New Roman"> 20V </FONT>电压检查风扇是否能正常工作。(注意:不要接反极性)。<p></p></P>
<P ><FONT face="Times New Roman">c&gt;.</FONT>检查晶体管<FONT face="Times New Roman"> Q701</FONT>是否损坏。<p></p></P>
<P ><FONT face="Times New Roman">d&gt;.</FONT>检查<FONT face="Times New Roman"> PFD </FONT>在开机后是否跳<FONT face="Times New Roman"> H</FONT>(高)电平。<p></p></P>
<P ><FONT face="Times New Roman">6.   </FONT>开机后不能加热。<p></p></P>
<P ><FONT face="Times New Roman">a&gt;.</FONT>检查锅具的材质是否为导磁材料。<p></p></P>
<P ><FONT face="Times New Roman">b&gt;.</FONT>检查锅具直径是否太小或锅底过薄。<p></p></P>
<P ><FONT face="Times New Roman">c&gt;.</FONT>线盘与锅底距离是否太大?<p></p></P>
<P ><FONT face="Times New Roman">d&gt;.R350</FONT>、<FONT face="Times New Roman">R352 </FONT>一大串电阻中有可能有个别电阻开路。<p></p></P>
<P ><FONT face="Times New Roman">e&gt;.IC</FONT>芯片<FONT face="Times New Roman"> LM339 </FONT>是否损坏。<p></p></P>
<P ><FONT face="Times New Roman">f&gt;.</FONT>板子之间插头接触是否可靠?<p></p></P>
<P ><FONT face="Times New Roman">g&gt;.</FONT>电源电压是否正常?<p></p></P>
<P ><FONT face="Times New Roman">h&gt;.IGBT </FONT>的<FONT face="Times New Roman"> G</FONT>、<FONT face="Times New Roman">E</FONT>极间短路或<FONT face="Times New Roman"> R317 </FONT>开路。<p></p></P>
<P ><FONT face="Times New Roman">7.   </FONT>开机后<FONT face="Times New Roman">LED</FONT>指示异常<p></p></P>
<P >可能主控<FONT face="Times New Roman">IC </FONT>芯片损坏。<p></p></P>
<P ><FONT face="Times New Roman">8.   </FONT>开机后能加热,但火力不足。<p></p></P>
<P ><FONT face="Times New Roman">a&gt;.</FONT>检查<FONT face="Times New Roman"> C300 </FONT>容量及漏电状况。<p></p></P>
<P ><FONT face="Times New Roman">b&gt;.</FONT>检查整流桥<p></p></P>
<P ><FONT face="Times New Roman">9.   </FONT>开机后能加热,但火力调不低。<p></p></P>
<P ><FONT face="Times New Roman">a&gt;.</FONT>检查<FONT face="Times New Roman">IC4D Pin 12 </FONT>上电压是否失控(指&gt;<FONT face="Times New Roman">5V</FONT>)。<p></p></P>
<P ><FONT face="Times New Roman">b&gt;.R403 </FONT>开路或变值。<p></p></P>
<P ><FONT face="Times New Roman">c&gt;.D303 </FONT>反向漏电太大。<p></p></P>
<P >六、维修方法及注意事项。<p></p></P>
<P ><FONT face="Times New Roman">1.       </FONT>维修时需用<FONT face="Times New Roman"> 3KVA</FONT>以上<FONT face="Times New Roman"> 1</FONT>:<FONT face="Times New Roman">1</FONT>的隔离变压器将高压电网与维修机隔离。<p></p></P>
<P ><FONT face="Times New Roman">2.       </FONT>所用示波器必需是外壳不接地的。<p></p></P>
<P ><FONT face="Times New Roman">3.       </FONT>在未找到故障原因之前严禁轻易更换熔断器。<p></p></P>
<P ><FONT face="Times New Roman">4.       </FONT>严禁用规格不一样的元器件代用,尤其是<FONT face="Times New Roman"> IGBT </FONT>和线圈盘。<p></p></P>
<P ><FONT face="Times New Roman">5.       </FONT>所用电烙铁应采用三芯插头,尤其是焊接<FONT face="Times New Roman"> IGBT </FONT>和主控<FONT face="Times New Roman"> IC</FONT>。<p></p></P>
<P ><FONT face="Times New Roman">6.       </FONT>严禁带电焊接和维修操作。<p></p></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><B>七</B><B><FONT face="Times New Roman">.</FONT></B><B>故障检查流程图</B><B><p></p></B></P>
<P ><B><FONT face="Times New Roman"> <p></p></FONT></B></P>
<P ><FONT face="Times New Roman">1.</FONT>通电后无任何反应<p></p></P>
<P ><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换主控<FONT face="Times New Roman">IC</FONT>板</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查主控<FONT face="Times New Roman">IC</FONT>板插头</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查开关电源输出</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查风机是否短路</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换</P>
<P >风扇</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查</P>
<P ><FONT face="Times New Roman">Q 102</FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换</P>
<P ><FONT face="Times New Roman">Q 102</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查</P>
<P ><FONT face="Times New Roman">D101,D102</FONT></P>
<P ><FONT face="Times New Roman">C106,C107</FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换相关远件</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查高频变压器</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换高频变压器</P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查</P>
<P ><FONT face="Times New Roman">VIP12A</FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换</P>
<P ><FONT face="Times New Roman">VIP12A</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查整流桥</P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换压敏电阻</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查压敏电阻</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P ><FONT face="Times New Roman">FUSE</FONT>是</P>
<P >否短路</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查</P>
<P ><FONT face="Times New Roman">FUSE</FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换<FONT face="Times New Roman">C300</FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查<FONT face="Times New Roman">C300</FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换电容</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查<FONT face="Times New Roman">5u</FONT>电容</P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换整流桥</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >组装</P>
<P >测试</P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换</P>
<P ><FONT face="Times New Roman">FUSE</FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >更换</P>
<P ><FONT face="Times New Roman">IGBT</FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:rect><v:textbox>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >检查<FONT face="Times New Roman">IGBT</FONT>及二极管</P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman" size=3></FONT></v:line><v:line><FONT face="Times New Roman" size=3></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman" size=3></FONT></v:line><v:line><FONT face="Times New Roman" size=3></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><B><FONT face="Times New Roman"> <p></p></FONT></B></P><BR  clear=all>
<P  align=left><FONT face="Times New Roman">                                                                                  NG                          NG                         NG</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><FONT face="Times New Roman">                                                                       OK                          OK                        OK</FONT></P>
<P  align=left><FONT face="Times New Roman">                      NG                           NG                       OK                           OK                         NG</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">                                                                             OK                                                   OK</FONT></P>
<P ><FONT face="Times New Roman">                        NG                                                                                                                   NG</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">                                                                            OK                                                   OK</FONT></P>
<P ><FONT face="Times New Roman">                        NG                                                                                                                   NG</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">                                                                            OK                                                   OK</FONT></P>
<P ><FONT face="Times New Roman">                       NG                                                                                                                      NG</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">                       NG                            OK</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">2.</FONT>放上锅具无加热效应</P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1175"><FONT face="Times New Roman"></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1175">
<P >检查<FONT face="Times New Roman">Q301</FONT></P>
<P >集电极电位<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1226"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1226">
<P >检查<FONT face="Times New Roman">SB1</FONT>应为<FONT face="Times New Roman">H</FONT>电位<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1227"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1227">
<P >更换主控<FONT face="Times New Roman">IC</FONT>板</P>
<P ><v:shape><v:imagedata></v:imagedata></v:shape></P></DIV></TD></TR></TABLE><FONT face="Times New Roman">                                                                         NG                                 NG</FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P><BR  clear=all>
<P ><FONT face="Times New Roman">                                                           OK                               OK</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1229"><FONT face="Times New Roman"></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1229">
<P >检查<FONT face="Times New Roman">Q302,Q303</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1230"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1230">
<P >换<FONT face="Times New Roman">Q302,Q303</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1222"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1222">
<P >检查<FONT face="Times New Roman">R352,R402</FONT></P>
<P >串电阻开路否</P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1233"><FONT size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1233">
<P  align=center>检查<FONT face="Times New Roman">IGBT</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1218"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1218">
<P  align=center>更换<FONT face="Times New Roman">C301</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1219"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1219">
<P  align=center>检查<FONT face="Times New Roman">Q304</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1220"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1220">
<P >检查<FONT face="Times New Roman">IC5B</FONT>应为<FONT face="Times New Roman">L</FONT>电位<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1221"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1221">
<P  align=center>检查<FONT face="Times New Roman">C301</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1225"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1225">
<P >换电阻</P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1223"><FONT size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1223">
<P >更换</P>
<P ><FONT face="Times New Roman">Q 304</FONT></P>
<P ><v:shape><v:imagedata><FONT face="Times New Roman"></FONT></v:imagedata></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1224"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1224">
<P >更换</P>
<P ><FONT face="Times New Roman">Q 301</FONT></P>
<P ><v:shape><v:imagedata><FONT face="Times New Roman"></FONT></v:imagedata></v:shape></P></DIV></TD></TR></TABLE><FONT face="Times New Roman">                                                                     NG</FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P><BR  clear=all>
<P ><FONT face="Times New Roman">                                                         OK</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P><BR  clear=all>
<P ><FONT face="Times New Roman">                                                         OK</FONT></P>
<P  align=center><FONT face="Times New Roman">NG</FONT></P>
<P ><FONT face="Times New Roman">                                   NG                                                                          NG</FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P><BR  clear=all>
<P ><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><FONT face="Times New Roman">                                                                                               OK</FONT></P>
<P ><FONT face="Times New Roman">                                                          OK                   NG</FONT></P>
<P ><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1234"><FONT face="Times New Roman"></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1234">
<P  align=center>观察<FONT face="Times New Roman">IC5C(Pin14)</FONT>的波形<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><FONT face="Times New Roman">                                                                                                                  NG</FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1231"><FONT face="Times New Roman"></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1231">
<P >更换<FONT face="Times New Roman">IGBT</FONT></P>
<P ><v:shape><v:imagedata><FONT face="Times New Roman"></FONT></v:imagedata></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1232"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1232">
<P  align=center>组装测试<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><FONT face="Times New Roman">                                               </FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">                                                           OK                              OK</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">                                   NG</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">                                                             OK</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">                            </FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">3.</FONT>放上锅具加热一段时期,自行停机在隔一段时间又再加热</P>
<P ><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1262"></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1262">
<P >检查风扇是否转动正常<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1228"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1228">
<P  align=center>检查风扇是否正常<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1270"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1270">
<P >更换风扇</P></DIV></TD></TR></TABLE><FONT face="Times New Roman">                                                                                  NG</FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><FONT face="Times New Roman">                                    NG</FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P><BR  clear=all>
<P ><FONT face="Times New Roman">              OK                                             OK</FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><FONT face="Times New Roman"></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1261"><FONT face="Times New Roman"></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1261">
<P  align=center>检查两只<FONT face="Times New Roman">NTC</FONT>是否损坏<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1263"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1263">
<P  align=center>检查风道是否受阻<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><FONT face="Times New Roman" size=3></FONT></v:line><v:line><FONT face="Times New Roman" size=3></FONT></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1265"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1265">
<P >检查<FONT face="Times New Roman">PFD</FONT></P>
<P >电位应<FONT face="Times New Roman">H</FONT></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1264"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1264">
<P  align=center>检查<FONT face="Times New Roman">Q701,D701</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1266"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1266">
<P  align=center>更换<FONT face="Times New Roman">NTC</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1267"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1267">
<P >组装测试</P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1268"><FONT size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1268">
<P >更换主控管</P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1269"><FONT size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1269">
<P  align=center>更换<FONT face="Times New Roman">Q701,D701</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><FONT face="Times New Roman">                 </FONT></P>
<P  align=center><FONT face="Times New Roman">NG</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">                OK                                         OK</FONT></P>
<P  align=center><FONT face="Times New Roman">NG</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">            OK                                                                  OK</FONT></P>
<P ><FONT face="Times New Roman">                                    NG</FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman">4.</FONT>放上锅具未按启动按钮即自行加热</P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1291"><FONT face="Times New Roman"></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1291">
<P  align=center>检查<FONT face="Times New Roman">SB1</FONT>应为<FONT face="Times New Roman">L</FONT>电位<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1298"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1298">
<P >更换主控<FONT face="Times New Roman">IC</FONT>板</P>
<P  align=center><v:shape><v:imagedata></v:imagedata></v:shape></P></DIV></TD></TR></TABLE><FONT face="Times New Roman">                                                                   NG</FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P><BR  clear=all>
<P ><FONT face="Times New Roman">                                                 OK</FONT></P>
<P ><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1297"><FONT face="Times New Roman"></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1297">
<P  align=center>更换<FONT face="Times New Roman">C301</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1292"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1292">
<P  align=center>检查<FONT face="Times New Roman">C301C</FONT>极应<FONT face="Times New Roman">H</FONT>电位<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><FONT face="Times New Roman">                                                                    NG</FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P><BR  clear=all>
<P ><FONT face="Times New Roman">                                                 OK</FONT></P>
<P ><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1296"><FONT face="Times New Roman"></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1296">
<P >更换</P>
<P ><FONT face="Times New Roman">Q304</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1293"><FONT face="Times New Roman" size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1293">
<P  align=center>检查<FONT face="Times New Roman">Q304</FONT><v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><FONT face="Times New Roman">                                                                  NG</FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P><BR  clear=all>
<P ><FONT face="Times New Roman">                                                   OK</FONT></P>
<P ><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1295"><FONT face="Times New Roman"></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1295">
<P >更换主控<FONT face="Times New Roman">IC</FONT>板</P>
<P  align=center><v:shape><v:imagedata></v:imagedata></v:shape></P></DIV></TD></TR></TABLE><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1294"><FONT size=3></FONT></v:textbox></v:rect>
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV class=shape  v:shape="_x0000_s1294">
<P  align=center>观察</P>
<P  align=center><FONT face="Times New Roman">PWM</FONT>波形<v:shape><FONT face="Times New Roman"> <v:imagedata></v:imagedata></FONT></v:shape></P></DIV></TD></TR></TABLE><FONT face="Times New Roman">                                                                     NG</FONT></P>
<P ><v:line><v:stroke endarrow="block"><FONT face="Times New Roman"></FONT></v:stroke></v:line><v:rect><v:textbox style="mso-next-textbox: #_x0000_s1290">
<TABLE cellSpacing=0 cellPadding=0 width="100%">

<TR>
<TD >
<DIV>
<P >组装测试</P>
<P  align=center><FONT face="Times New Roman"> <p></p></FONT></P></DIV></TD></TR></TABLE></v:textbox></v:rect><v:line><v:stroke endarrow="block"><FONT face="Times New Roman" size=3></FONT></v:stroke></v:line><FONT face="Times New Roman"> <p></p></FONT></P>
<P ><FONT face="Times New Roman"> <p></p></FONT></P><BR  clear=all>
<P ><FONT face="Times New Roman">                                                  OK</FONT>无波形</P>

9E36pclD.doc

366.5 KB, 下载次数: 98, 下载积分: 金币 -1

三洋F18电磁炉维修手册

发表于 2006-3-11 18:11:41 | 显示全部楼层
好顶
发表于 2006-10-24 00:06:53 | 显示全部楼层
附件为美的电磁炉故障诊断及故障维修
发表于 2006-11-14 21:00:36 | 显示全部楼层

好贴

楼主辛苦了,可以提供文章中用到的电路图吗?有图学习起来更方便啊.
发表于 2006-12-5 17:49:28 | 显示全部楼层
谢谢楼主,文中的图片在哪里找啊
发表于 2007-1-3 00:16:54 | 显示全部楼层
好东西,谢谢啊
发表于 2007-4-9 22:27:11 | 显示全部楼层
好东西!
发表于 2007-10-16 13:36:07 | 显示全部楼层
发表于 2007-12-7 19:03:41 | 显示全部楼层
好是好,图在哪呢?没有图是空谈啊.....................................
发表于 2008-1-9 12:03:46 | 显示全部楼层
OK  OK OK  OK
您需要登录后才可以回帖 登录 | 快速注册

本版积分规则

关闭

站长推荐上一条 /1 下一条

手机版|APP|家电维修技术论坛 ( 鄂ICP备09003585号-2 )

GMT+8, 2024-3-29 06:00 , Processed in 0.202008 second(s), 7 queries , Gzip On, MemCache On.

Powered by Discuz! X3.4

Copyright © 2001-2020, Tencent Cloud.

CopyRight © 电子技术论坛
电子邮箱:8794149@qq.com | 联系 QQ:3081868839 | 官方网址:www.dzdu.com

Qiji. All Rights Reserved


服务条款 | 站长声明

Wuhan Qiji Technology Co., Ltd.武汉奇迹科技有限公司版权所有


鄂ICP备09003585号-2鄂公网安备42010602000420号

快速回复 返回顶部 返回列表