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故障现象,接通电源后,显示器无任何显示。按VTR开关,电源指示灯不亮。从故障现象看可能是电源问题。打开外壳,查交流保险F_(1101)正常。通电测整流桥输出有300V直流电压,而开关变压器T_(1101)二次输出全部为0V。从以上现象看,开关电源不工作,原因大约有两种:(1)开关电源本身故障所致。(2)负载某一回路出现严重短路导致开关电源自保。当把负载全部断开后,再测电源输出,各路电压均与正常值相符。由此看来,电源没问题。于是测接插件P_(6002)各脚对地的阻值如表1
Symptoms, after power, the monitor without any display. Press the VTR switch, the power indicator does not light. From the phenomenon of failure may be a power problem. Open the shell, check the exchange of insurance F_ (1101) normal. Rectifier bridge power output of 300V DC voltage, and switching transformer T_ (1101) secondary output all 0V. From the above phenomenon, switching power supply does not work, there are about two reasons: (1) switching power supply itself due to failure. (2) A serious short circuit in the load leads to self-protection of the switching power supply. When the load is all disconnected, and then test the power output, the voltage of each line are in line with the normal value. Seen in this light, the power is no problem. Then test connector P_ (6002) feet on the ground resistance shown in Table 1