论文部分内容阅读
1 开机启动 Start按键后 ,走纸速度失控分析与检修 走纸电机速度控制电路采用锁相环(PL L )技术 ,由晶体管 X2 0 2 ,ZD2 0 1组成的时基震荡电路产生 32 .76 8k Hz的方波 ,经 14级二进制计数器IC2 0 9计数分频得到 2 5 6 Hz (用于 2 0 mm/ s纸速 )和5 12 Hz(用于 5 0 mm/ s纸?
1 start-up start button, the paper speed out of control Analysis and Overhauling paper motor speed control circuit using phase-locked loop (PL L) technology, the transistor X2 0 2, ZD2 0 1 composed of time-base oscillation circuit generates 32.76 8k Hz square wave is divided by a 14-stage binary counter IC2 0 9 to give a 2 5 6 Hz (for 20 mm / s paper speed) and 5 12 Hz (for 50 mm / s paper)