The prism and reflector in the metallographic microscope can generally be removed, the position can be adjusted, after cleaning, can be put back into position. But sometimes it is necessary to remove the mirror seat together to repair other parts. If there is no positioning pin in the mirror seat, it is better to mark the mirror seat with a steel needle when disassembling, so that it is more convenient to restore the system.

When the calibration mirror or reflector is not in the right position, the field of view or projection screen will appear dark, uneven lighting or partially blocked field of view. When the degree of positional disorder is not large, the imaging can also be clearly visible, but often accompanied by an oblique or trapezoidal shape.

The mutual position and direction of the light rays of the semi-mirror, parallel prism, and half-pentagonal spindle-lens of a metallographic microscope (referred to as the monocular spindle-lens above). When half mirror 1 position deviation occurs, in the eyepiece will observe view lost the round, uneven brightness of one and a half to make the position of the mirror to restore the main, often of the bottom of bowl can be head group of three of the four headless set screw unscrew, fingers hold position 8 condenser and turning gently, can put about half a reflector (BNH) position adjustment. If the position of the semi-mirror is too high or too low, remove the eyepiece tube set and the parallel prism holder from the head of the bowl. Turn the adjusting ring 1 of the condenser to adjust the upper and lower positions of the semi-reflector. When adjusting, we should pay attention to loosen the positioning screw (below the adjusting ring of the condenser lens) first, and tighten the positioning screw properly after adjustment to prevent the position deviation.

To check whether the position of the half-pentagonal prism is normal, first adjust the light bar of the field of view to the center of the field of view and open it up to the same as the field of view of the eyepiece. Then loosen the adjusting screw 5 under the eyepiece tube and turn the eyepiece tube 90° to observe whether the light bar of the field of view is deviated or not. Showing the position of half pentagonal prism is normal, in case of deviation, monocular eyepiece tube group can be unloaded, screw the cylinder head screw, will be half pentagonal prism, together with the lens seat to unload, unscrew the circle to screw again, according to the field of light bar like offset, fine-tuning half pentagonal prism location, until no matter how to turn the eyepiece tube, both observation field of diaphragm as location deviation. After adjustment, the cylindrical head screw should be screwed up again.