a. If there are regular more needles or less needles, find the working needle selector, remove it and insert the plug, enter the test screen, observe the needle selector of the needle selector when it vibrates, and find a certain selector. The needle movement is inflexible or immobile. Try another pin selector plug. If the selector still does not move flexibly or does not move, it means that the selector is broken; if the selector moves flexibly, it means that the selector board is broken. (On the premise that the wire or the connector of the wire is in good contact)
b. If there are irregularly more needles or less needles, if there are more needles (less needles) when walking slowly, it means that the position of the needle selector is not good. Find the extra (under) needle and see if it's on the top or bottom of the set of jacquard needles. In this way, it is judged whether the upper foot of the needle selector is not installed properly or the lower part is not installed properly, and the gasket is reduced (increased) according to the situation. If there are more or less random needles during slow travel and fast travel, it may be: the jacquard needle is not good; the origin of the needle selection is not good; the power supply is not good; the chassis motherboard is not good, etc.