《家电维修基础2》2.7 电阻器常见故障判断与维修

技术支持评论976字数 465阅读1分33秒阅读模式

2.7  电阻器常见故障判断与维修

本章图片暂略

●══●══●══●══●══●  

2.7.1  阻值改变故障判断及维修

阻值改变故障比较常见,由于温度、电压、电路的变化超过限值,使电阻阻值变大或变小,用万用表检测时可发现,实际阻值与标称阻值相差很大,而一般都是阻值变大,如图2-28所示。阻值变化的这类故障,只能换新的电阻器才能消除。

●══●══●══●══●══●  

2.7.2  断路故障判断及维修

所谓断路就是电阻无限大,电路不通。断路故障有的可目测出来,如引线折断、脱落、松动及断裂等,如图2-29所示。有的则必须用万用表测量。测量时,发生断路故障的电阻指针会指示无穷大。

●══●══●══●══●══●  

2.7.3  内部接触不良故障判断及维修

如果家用电子电器有杂音、噪声或者有间断的响声,这类故障多数是由电阻器内部接触不良造成的,有时电阻工作时还会带有微小的跳火现象。

电阻器常因碳膜损坏而接触不良,如图2-30所示,如在收音机电路里会使收音机发声音轻、时响时停、杂音大及无音等;在电视机电路里会使电视机无光、无图像、和无声等。

 


Warning: file_exists(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/2024/03) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2036

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/2024) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 7

Warning: file_exists(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2036

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www/wwwroot) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/www) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_dir(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-includes/functions.php on line 2047

Warning: is_file(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar/b32f9e95aaf5f958e5327dc1538e4e1c96.png) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 21

Warning: is_file(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar/b32f9e95aaf5f958e5327dc1538e4e1c-d.png) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 22

Warning: fopen(): open_basedir restriction in effect. File(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar/b32f9e95aaf5f958e5327dc1538e4e1c-d.png) is not within the allowed path(s): (/www/wwwroot/yxjdzl.com/:/tmp/) in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 26

Warning: fopen(/www/wwwroot/www.yxjdzl.com/wp-content/uploads/avatar/b32f9e95aaf5f958e5327dc1538e4e1c-d.png): Failed to open stream: Operation not permitted in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 26

Fatal error: Uncaught TypeError: fclose(): Argument #1 ($stream) must be of type resource, bool given in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php:27 Stack trace: #0 /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php(27): fclose() #1 /www/wwwroot/yxjdzl.com/wp-content/themes/begin/template/copyright.php(21): begin_avatar() #2 /www/wwwroot/yxjdzl.com/wp-includes/template.php(772): require('...') #3 /www/wwwroot/yxjdzl.com/wp-includes/template.php(716): load_template() #4 /www/wwwroot/yxjdzl.com/wp-includes/general-template.php(204): locate_template() #5 /www/wwwroot/yxjdzl.com/wp-content/themes/begin/single-default.php(16): get_template_part() #6 /www/wwwroot/yxjdzl.com/wp-includes/template.php(772): require('...') #7 /www/wwwroot/yxjdzl.com/wp-includes/template.php(716): load_template() #8 /www/wwwroot/yxjdzl.com/wp-includes/general-template.php(204): locate_template() #9 /www/wwwroot/yxjdzl.com/wp-content/themes/begin/single.php(6): get_template_part() #10 /www/wwwroot/yxjdzl.com/wp-includes/template-loader.php(106): include('...') #11 /www/wwwroot/yxjdzl.com/wp-blog-header.php(19): require_once('...') #12 /www/wwwroot/yxjdzl.com/index.php(17): require('...') #13 {main} thrown in /www/wwwroot/yxjdzl.com/wp-content/themes/begin/inc/avatar-cache.php on line 27
WordPress › 错误