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故障现象:不能进出盘。分析与检修:该机进出盘电路是由系统控制电脑块PD0071(49)脚和(50)脚配合加载集成电路TA7291 P来完成进出盘功能的(见图1)。 PD0071系统控制电路(49)脚为该机进出盘指令的输出端,TA7291是进出盘驱动集成电路,⑩脚与驱动电机正端相连,②脚与驱动电机负端相连。当系统控制接到面板来的入盘指令后,PD0071的(50)脚就有电平
Symptoms: can not enter the disk. Analysis and Maintenance: The aircraft access to the circuit board is controlled by the system PD0071 (49) feet and (50) feet with the integrated circuit loading TA7291 P to complete the import and export functions (see Figure 1). PD0071 system control circuit (49) feet for the aircraft out of the disk command output, TA7291 is in and out of the disk drive integrated circuit, ⑩ pin is connected to the positive drive motor, ② pin connected to the negative drive motor. PD0071’s (50) pin has a level when the system control receives the panel access command from the panel