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1.故障现象 东芝DFW-10B型500mA X线机,在开机时出现灯丝加热电路过电压(OV)、过电流(OC)报警,并显示错误代码90,机器自动锁定,不能进行透视及点片。打开操纵台前盖,按下FH-PWB板上的复位开关RE-SET,按钮不能复位。关机后重新启动,故障依旧。 2.检查与维修 按照东芝维修站提供的故障筛选流程图,在开机状态下测量FH-PWB板上的E_0,测试点的电压为140V;关机测量P_(117),的电阻力0,经检测Q_1被击穿。换用正常Q_1后开机,错误90及报警声消失,机器可以进行透视及点片,但透视手动mA不受调,在自动ABC档上透视KV上冲达120KV,图象极不清晰,面板上的
1. Symptom Toshiba DFW-10B 500mA X-ray machine, the filament heating circuit overvoltage (OV), overcurrent (OC) alarm, and the error code 90, the machine automatically locks, can not be perspective and spot . Open the console front cover and press the reset switch RE-SET on the FH-PWB board. The button cannot be reset. After restarting after shutdown, the fault persists. 2. Inspection and maintenance According to the troubleshooting flowchart provided by Toshiba Service Station, E_0 on the FH-PWB board is measured at the power-on state, the voltage at the test point is 140V, and the power-off force at the shutdown measurement P_(117) is 0. Q_1 was broken down. After switching to normal Q_1 and turning on, the error 90 and the alarm sound disappear, the machine can perform perspective and spotting, but the perspective manual mA is not adjusted, the perspective AOA file on the perspective of KV up to 120KV, the image is extremely unclear, on the panel of