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故障现象:有时光栅闪动并伴随闪动发出“嗡嗡”的响声,故障时隐时现。分析与检修:根据维修经验初步判断,故障发生在开关电源电路,造成光栅闪动的主要原因是107V主电压输出忽高忽低而引起。测量该电压在98V～107V之间变化。经逐步代换C712滤波电容N70(IX0698)电源的厚膜块、C706电源滤波电容及VD706稳压管、VD701～VD704四个整流二极管,故障依旧。修理陷入
Symptoms: sometimes flashing and flashing with the issue of “buzzing” sound, when the fault is hidden. Analysis and Maintenance: According to the preliminary judgment of maintenance experience, the fault occurs in the switching power supply circuit, causing the flashing of the grating is mainly caused by the 107V main voltage output fluctuating. The voltage is measured between 98V and 107V. After the gradual substitution of C712 filter capacitor N70 (IX0698) power supply thick film, C706 power supply filter capacitor and VD706 regulator, VD701 ~ VD704 four rectifier diodes, the fault still. Repair stuck