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例1 机型:日立CEP—321D型彩色电视机故障现象:开机1小时左右,机内出现刺耳的行频叫声。分析检修:将行频部分各焊点重新焊一遍,开机1小时左右,故障又出现,查行激励和行输出电路各点电压均正常,用螺丝刀压住开关电源变压器T901磁芯时行频叫声消失,原因是磁芯受热间隙增大和磁芯松脱所造成的。在线圈塑料支架和磁芯之间加在塑料薄片卡牢支架和磁芯,并用502胶水重新将磁芯对缝处粘牢即可
Example 1 Model: Hitachi CEP-321D-type color TV Fault phenomenon: boot about 1 hour, the machine appears harsh lines barking. Analysis and maintenance: the frequency of the welding spot to re-welding again, boot about 1 hour, the fault appears again, check the line of incentives and line output voltage at all points are normal, with a screwdriver to suppress the power switch T901 core transformer frequency The sound disappears, because the core heating gap increases and the core loose caused. Between the coil plastic bracket and the core plus plastic sheeting stuck bracket and the core, and with 502 glue to re-stick the magnetic core can be firmly bonded