Microscopes are commonly used instruments. After frequent use, there will be some malfunctions that make the microscope unable to be used normally. Since the microscope is a precise and valuable instrument, it is impossible to add and update at any time. Therefore, it is very important to troubleshoot in time and keep it in perfect working condition.

　　 One, coarse adjustment failure

　　 The fault phenomenon is that when the coarse collimation screw is turned, the lens barrel cannot be raised and lowered.

　　The lifting of the microscope lens is realized by the gear driven by the gear, and the gear is fixed on the shaft of the coarse adjustment knob, and the rack is fixed on the lens barrel. When the coarse adjustment knob is turned, the gear drives the bar to lift the lens barrel. If the lens barrel cannot be raised and lowered, it means that the gear and rack do not match.

　　 The common cause of failure is that the gear rod sleeve rotates with the coarse adjustment knob, that is, the two stop screws on the gear rod sleeve do not fix the gear rod sleeve on the dovetail guide rail.

　　The repair method is to move the gear to the middle of the notch of the gear rod sleeve, and make the notch of the gear rod sleeve face the rack, and then use a small screwdriver to tighten the two stop screws on the end surface of the tail rail. If it is invalid, it means that the rack is worn seriously, you need to remove the lens barrel, unscrew the fixing screws on the top and bottom of the rack, and use the rack upside down, because the rack wear mainly occurs on the upper part of the rack. Or cut a piece of metal foil according to the width of the rack, let the metal foil be inlaid on the rack, and fix the foil and the rack on the lens barrel with a fixing screw, and insert the lens barrel for debugging.

　　 If you feel any tightness, you can change the thickness of the metal sheet until it is suitable. Or buy a new rack from the manufacturer according to the original model specifications.

　　 2. The lens barrel slides down by itself

　　 The fault phenomenon is that when the focus is aligned, if the focus screw is released by hand, the lens will slide down by itself, causing the focus to be inaccurate. In the coarse adjustment structure of the microscope, the tightness of the gear shaft is generally controlled by the friction between the gear shaft sleeve and the coarse adjustment knob, and the friction between the gear shaft and the gear shaft sleeve is controlled by the two gear shafts connected to the gear shaft. A rough adjustment button is obtained by pressing two plastic washers on the end face of the toothed rod sleeve. The tighter the grain is adjusted or pressed against the end surface of the gear rod sleeve, the greater the friction force obtained. The reason why the lens barrel slides down on its own is due to the wear and tear of the gasket, which reduces the friction between the gear shaft and the gear rod sleeve. The torque generated by the friction between the gear shaft and the gear rod sleeve cannot overcome the gravity of the lens barrel. And caused by the torque generated. The repair method is to hold the coarse adjustment knob on one side with both hands, and tighten the coarse adjustment knob in a clockwise direction. If it does not work, the washer needs to be thickened. Use needle-nose pliers to insert into the double-eye nut on the end face of any coarse adjustment knob, unscrew it, remove the coarse adjustment knob, take out the plastic washer, cut a washer of the same diameter with a green shell paper or thin plastic sheet, and clamp it between the original washer and Reinstall the coarse adjustment knobs. If it takes a lot of effort to turn the coarse adjustment knobs, it means that the washer is too thick. You should replace it with a thinner washer. In short, it is difficult to rotate the coarse adjustment knob or have a certain resistance and the lens barrel is not easy to spontaneously. Decline shall prevail.

　　 Three, the collector cannot be positioned or stuck

　　 There are two common types of light collectors: one is a disc or a diaphragm, and there are circular holes of varying sizes in the disc.

　　This kind of diaphragm is positioned by the positioning spring and the ball under the stage which are stuck in the positioning hole of the disc. When the ball is lost or the spring fails, the light beam may not be positioned. The repair method is to replace the ball or spring. Now some manufacturers have changed this positioning method that relies on springs and balls to rely on spring plates for positioning. This structure is firmer and less likely to be damaged. The other is a rainbow beam, which is composed of twelve arc-shaped thin steel sheets (that is, shading sheets). As long as you move the handle on the sliding right, you can change the size of the aperture at will. The common fault is that the small steel column on the shading sheet falls off, causing the handle to jam and the aperture cannot be changed.

　　The repair method is to loosen the two fixing screws on the light barrier with a small screwdriver, take out the shading sheet, reinstall the small copper pillar that fell off on the shading sheet, and glue the small copper pillar with 502 glue to prevent it from falling off. When installing, pay attention to the opposite direction of the two small copper posts on each shading film. Or find a small piece of copper wire with a thickness that closely matches the aperture on the light sheet to make small copper pillars and install it, and then place the base plate of the light barrier (a circular plate with twelve small holes is called the base plate) upward, and place each piece The small copper pillars at the first end of the light-shielding sheet are inserted into the small holes of the bottom plate, and are arranged neatly one by one in the counter-clockwise and outward direction. Then put the sliding groove on the sliding plate on the small copper column at the other end of the above-mentioned light-shielding sheet in turn, cover the cover plate, and tighten the three fixing screws. If the light-shielding sheet is broken, just take out the broken light-shielding sheet. The fence can still be used normally, if more than two pieces are broken, you should purchase replacement from the manufacturer.

　　 Fourth, the tilt joint is too loose

　　Tilt joint refers to the movable joint at the joint between the mirror arm and the mirror column. When using a microscope, the mirror arm is often tilted back to an angle that is convenient for observation. After use, the tilt joint may loosen, causing the mirror arm to not tilt at will.

　　The repair method is to insert needle-nose pliers into the two double-eye nuts on the end face of the inclined joint respectively, and rotate clockwise until the mirror arm is inclined properly. If it does not work, it may be that the friction washers on both ends of the mirror arm and the mirror column are worn, and the washers need to be thickened. Unscrew the binocular nut with a needle pin, take out the rotating shaft, and cut a piece of the same diameter with a green shell paper or thin plastic sheet. Kuitu thickened the original gasket and reassembled it.

  Fives. The pin of the reflector is too loose or too tight in the socket

　　 There are two common pin structures for mirrors:

One is to open a slot on the pin, and adjust the tightness of the pin in the socket depending on the width of the slot. When the pin is too loose in the socket, a flat-blade screwdriver can be inserted into the slot of the pin to increase the opening of the slot. Make the pins fit tightly in the socket. Conversely, when the pin is too tight, wire cutters can be used to narrow the opening of the slot on the pin.

　　 The other is to rely on the tightening screw to adjust the pin to be tight in the socket. When the pin is too loose in the socket, a screwdriver can be used to tighten the set screw. If the pin is too tight in the socket, it is easy to twist the pin when the reflector is turned. You can loosen the fixing screw with a screwdriver.