Look, open all the laser lines, make a punctuation on the table, hit the laser point on it, slowly turn the instrument 360 degrees, see if the drooping point is centered (do not deviate from the laser point), if it is biased, That means the hammer is not allowed. You need to adjust the screws in the four directions below the hammer to adjust it.
First look at the upper shaft (we call it the flat) is loose or too tight, if it is, you need to adjust the screw of the cardan shaft, if it is not used, it means to be replaced, check The method is: put the instrument in the laser line and shoot it out, no matter how accurate it is, make a punctuation, and then shake the instrument to see if it is still in the original position. If it is, then it can be used. If it is not, then it should be screwed or replaced. It is, replacement is a big project, so it depends on your instrument value is not worth doing this project
For the lines do not coincide, you first look at the vertical line, is it not all vertical, if one is vertical, then the other does not coincide, then you adjust it to the vertical, this time normal is fine This time is the 2.3 screw identified in the adjustment diagram
If the adjustment is coincident, but it is still not allowed, there may be a problem: your laser line is originally bent, then it is necessary to adjust the four screws on the front of the laser head, that is, the number 1 in the figure.