IBM 301 0175 0188 1802等一些常见报错维修方法（国外英文资料）.doc

IBM 301 0175 0188 1802等一些常见报错维修方法（国外英文资料） The IBM 301 0175 0188 1802 and other common error maintenance methods 2007-06-14 09:27 keyboards are made up of keystrokes, keycards, rubber pads, and circuit boards. The circuit boards are liable to be damaged, and the repair price is about 150 yuan. If the keyboard is often removed, the key risk and key card will be damaged, and the price of a single key and key card will be 30 yuan to 50 yuan. The circuit board is composed of three layers of plastic, the upper layer is the power supply layer, and there are eight power lines. The middle tier is the isolation layer (this layer is not easily corrupted); The bottom layer is the signal layer, which consists of the sixteen signal lines and the ground lines interspersed in it. The keyboard is usually connected to a keyboard chip or I/O. The commonly used keyboard chips are pc87591 and pc87570, which have keyboard management and boot function. In normal power supply, if the keyboard cannot be used, most of the two chip damage. Only by using the hand keystrokes, the power layer and the signal layer contact, producing a high level to trigger the keyboard chip. Keyboard failure general score: 1, the single bond is bad; Multiple bonds are bad; Single-bond bad, multi-bond is more common on P4 and fast machines, usually played by playing games. Single or multikey damage is caused by an aging circuit board circuit, a broken line or a broken line in the keyboard interface. When the line is broken, the wire can be used to make the line. The whole keyboard is broken; The whole keyboard cant be used for any reason: keyboard chip, keyboard interface line damage, or keyboard circuit board assembly is not in place, and the power layer and signal layer are misaligned. To determine whether the keyboard is damaged, you can take the keyboard test first, and if the external keyboard is working properly, you can judge the keyboard damage. If the external keyboard is not available, the keyboard chip