故障一 3070打印机工作一段时间后,不走纸,打印一条黑印。用手触摸走纸电机(LFTOMOTOR)和电机驱动集成块IC_(43)(62064),发现温度过高。故障分析与排除走纸电机是四相步进电机,其驱动电流由TD62064四功率反相驱动器提供。当步进电机不转动时,要将它锁住。由于步进电机锁住电流较大,会使电机和驱动集成块耗电大而发热,因而该机采用了“高低压驱动”的方法。在电机锁住状态时,由+5V经R_5、CR_6向电机提供低电压。当电机转动时,由 Trouble 3070 Printer work for a period of time, do not take the paper, print a black print. Touch the paper feed motor (LFTOMOTOR) and the motor drive manifold IC_ (43) (62064) by hand to find the temperature is too high. Fault Analysis and Troubleshooting The paper feed motor is a four-phase stepper motor, the drive current provided by the TD62064 four-power inverting drive. When the stepper motor does not rotate, it should be locked. As the stepping motor lock current larger, will make the motor and drive manifold power consumption and fever, so the machine uses a “high and low voltage drive” approach. When the motor is locked, a low voltage is supplied to the motor from + 5V via R_5 and CR_6. When the motor rotates