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一.LQ—166K打印机不走纸 故障现象:关机,转动手柄发觉字辊上的走纸齿轮断裂,换上新齿轮,开机走两行又停,且走纸非常吃力。关掉电源旋动进纸手柄,感觉用很大劲才能旋动字辊。取下走纸电机,手动其转轴要用很大劲。显然走纸电机已坏（正常电机轴能轻易转动）。换走纸电机后,开机能走纸打印.但发觉电机一会儿就热得烫手,这是不正常的,所以怀疑电机驱动电路有问题（经过电机线圈的电流比正常大易烧电机线圈）。
1.LQ-166K printer does not take the paper Fault phenomenon: shutdown, turn the handle found on the paper roll paper gear broken, put a new gear, boot and walk two lines and stop, and the paper is very difficult. Turn off the power to rotate the paper feed handle, feel great effort to spin the word roll. Remove the paper feed motor, manual shaft to use a lot of strength. Obviously the paper feed motor has been bad (normal motor shaft can easily rotate). After changing the paper motor, the paper can be printed on by turning on the paper, but it is not normal to find the motor hot for a while. Therefore, there is a problem with the motor drive circuit (the current passing through the motor coil is larger than that of the normal large easy-to-burn motor coil).