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一、检修步骤当开机出现“三无”故障时,首先用万用表电压档测量+B 121V电源电压是否正常。若+B电压正常,则重点检查IC1101工作电压,复位电路及相关输出控制电路,基色矩阵、视放电路和行扫描电路等。若无+B电压,则测量整流、滤波输出300V电压是否正常。若无300V电压,则应检查保险管F_(801)、保险电阻R_(803)、R_(812)和整流及其它电路等。若300V正常,则
First, the maintenance steps When the boot appears “three noes” failure, the first voltage meter with a multimeter to measure + B 121V power supply voltage is normal. If the + B voltage is normal, then focus on checking IC1101 operating voltage, reset circuit and related output control circuit, the primary color matrix, as the release circuit and the line scan circuit. If there is no + B voltage, the measured rectifier, filter output voltage is 300V normal. If there is no 300V voltage, you should check the fuse F_ (801), insurance resistance R_ (803), R_ (812) and rectifier and other circuits. If 300V is normal, then