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LQ 1600 K型打印机为点阵式24针打印机,打印效果比较理想,被用作多种微机的外设。目前在办公、商业、教学等各部门广泛使用,有的还进入了家庭。使用中,除其主机部分外,电源部分引起的故障占有一定比例。为掌握其工作原理,便于维护,这里对它的工作原理和检修方法作一简单介绍。图1为其电原理图。该机电源采用单管自激式开关电源、有四组稳定电源输出:+35V(1.4A)、用于针驱动器和字车、输纸电机,+5V(1A),用于机内各逻辑芯片;±12V(0.2A),用于串行口的电子线路。
The LQ 1600 K printer is a dot matrix 24-pin printer that prints well and is used as a peripheral to many types of microprocessors. Currently in the office, business, teaching and other departments widely used, and some also entered the family. In use, in addition to its host part, the power part of the fault caused by a certain percentage. To master its working principle, easy to maintain, here’s its working principle and maintenance methods for a brief introduction. Figure 1 is its electrical schematic. The machine power supply using a single tube self-excited switching power supply, there are four stable power output: +35 V (1.4A) for the needle drive and the word car, paper motor, +5 V (1A) Chip; ± 12V (0.2A) for serial port electronics.