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故障现象 一台ARFAX-2000A/B型图文传真机通电开机后面板无显示,也不自检。 分析与检修 从上述现象上看,该机不能工作,问题大多出在开关电源电路。该机开关电源较为复杂,主要由两部分组成,即开关稳压电路及DC-DC变换电路。这两部分电路任何一处异常,均会导致本例故障。检修时,应先判明故障是在开关稳压电路还是在DC-DC变换电路。 首先,拆开机器取出开关电源组件。直观检查开关板上
Symptom An ARFAX-2000A / B teletext machine power on the rear panel no display, not self-test. Analysis and maintenance From the above point of view, the aircraft can not work, most of the problems in the switching power supply circuit. The switch power supply is more complicated, mainly composed of two parts, namely, switching regulator circuit and DC-DC converter circuit. Any one of these two circuit abnormalities, will lead to the failure of this case. Maintenance, should first identify the fault is in the switching regulator circuit or DC-DC converter circuit. First, remove the machine and remove the switching power supply assembly. Visual inspection on the switch board