Troubleshooting of objective lens converter faults

The main malfunction of the objective lens converter is the malfunction of the positioning device. Generally, it is caused by damage to the positioning spring plate (deformation, fracture, loss of elasticity, loosening of the fixing screws of the spring plate, etc.). When replacing a new spring plate, do not tighten the fixing screws temporarily. Instead, perform optical axis correction according to "Section 3 (2) 2" in this section. After the shaft is assembled, tighten the screws again. If it is an internal positioning converter, the large head screw in the center of the rotating disc should be unscrewed, and the rotating disc should be removed before replacing the positioning spring plate. The method of optical axis correction is the same as before.
Troubleshooting of the lifting mechanism of the concentrator
The main malfunction in this section is also automatic sliding. The exclusion method is as follows:
(1) The lifting mechanism of the straight tube microscope condenser: 1 5. Celluloid washer 2. Large head screw 3. Eccentric toothed rod sleeve 4. Toothed rod 6. Lifting handwheel 7. When adjusting the double eye nut, insert one hand into the double eye nut on the end face of the handwheel with a double eye nut wrench, and the other hand into the groove of the large head screw on the other end with a screwdriver. Tighten firmly to stop the sliding.
(2) The lifting mechanism of the oblique tube microscope condenser:
When adjusting, first use a screwdriver to remove the retaining screw 2 in the middle of the double eye nut by 1-2 turns. The bearing washer 3 is tightly matched with the retaining screw 2, so it will also be removed along with it and detach from the end face of the gear rod 10. Then, use a double eye nut wrench to screw double eye nut 1 into the adjustment seat 5. At the same time, use the other hand to rotate the handwheel and conduct the experiment until the lifting mechanism is properly tightened and can stay in any position, then stop the double eye nut from being screwed in. Finally, insert the stationary screw again so that the bearing washer contacts the gear rod 10.
The reason why this adjustment can eliminate faults is because the inner hole of adjustment seat 5 is conical. The tapered shaft sleeve 4 has grooves in the axial direction. When the double eye nut 1 is turned inward, the conical sleeve is pushed inward, causing the groove of the conical sleeve to become smaller and the inner hole to shrink. This clamps the gear rod 10 tighter, increasing the frictional resistance of gear rotation and preventing automatic descent.