测整机高压供电电路C2对地电压为+305V。正常;测低压供电电路EC6对地电压为+18V,正常;测IC3(LM7805)OUT对地+5V电压,正常;测比较器IC1各脚对地电压均正常。用R×100挡浪涌保护电路,发现贴片二极管D14(1N4148)正向电阻变大。更换D14后整机恢复正常。 |
|Archiver|手机版|家电维修论坛
( 蜀ICP备19011473号-4 川公网安备51102502000164号 )
GMT+8, 2025-7-10 13:52 , Processed in 0.119930 second(s), 17 queries .
Powered by Discuz! X3.5
© 2001-2025 Discuz! Team.