[例1]通电按“O P E N/C L O S E”键,托盘不能出/入。分析与检修:该机有关托盘出/入控制电路如图1。微处理器U1(CD T612)接到“OPEN”操作指令时,輥脚输出低电平,輥脚输出高电平,V T4、VT3导通,VT5、V T2截止,托盘电机正转,通过传动机构使托盘出盒,当托盘出盒到规定位置时,会 [Example 1] Power ON Press the “O P E N / C L O S E” key, the tray can not go in / out. Analysis and maintenance: The machine about the tray out / into the control circuit shown in Figure 1. Microprocessor U1 (CD T612) receives the “OPEN” operation instruction, the roll pin output low level, the roll pin output high level, V T4, VT3 conduction, VT5, V T2 deadline, Drive mechanism to the tray out of the box, when the tray to the specified position, will