Celestron Advanced Stereo Microscope Microscope Manual (44200, 44202, 44204, 4 - Page 15

Focusing and Changing Power To achieve the best focus for your microscope, not only can you make adjustments with the focus knobs, but you can also adjust the left diopter ring (1) of the left eyepiece as well as the interpupillary distance between the eyepieces: Start with the zoom power knob (14) at the 0.7x position on the dial which is the lowest power (10x). It is usually best to begin viewing a specimen at low power, then zoom to high powers. The maximum power is 67x (dial at 4.5x). 1. Turn the focus knob (6) until the specimen comes into focus. If there is not enough travel in the focuser mechanism to reach focus, it may be necessary to loosen the pillar stand locking knob (5) and raise or lower the entire binocular head assembly (15) until the image becomes sharp. 2. While looking through the eyepieces, adjust the interpupillary distance by rotating both eyepieces and the eyepiece holding up and down until the whole field of view can be observed through both eyes at the same time. The reason this is necessary is that people have varying distances between their eyes. 3. Close your left eye and focus with the right eyepiece until the image is sharp. Then, close your right eye and turn the left eyepiece diopter ring (1) until the image is in sharp focus through the left eyepiece. Now the interpupillary distance is set and you can focus only with the focus knob (6). 4. If higher power is desired, rotate the zoom power knob (14) to the desired power. As you increase power, you will have to refocus the object. 5. You can adjust the tension of the focus knobs (6) to suit your needs. Looking straight at the microscope, hold the left focus knob tight and rotate the right focus knob clockwise to make the tension stiffer. To make the tension looser, you would rotate the right focus knob counterclockwise. Replacing Illuminator Bulbs Top Illuminator Bulb - to replace the bulb: 1. Remove the top illuminator from the bracket arm by unscrewing the illuminator lock screw (4). 2. Hold the top piece of the illuminator (the piece with the cable attached to it) with one hand. With the other hand, pull the body away from the top piece by twisting slightly and the bulb can be seen in its socket holder - see Figure 4c. 3. Gently remove the bulb from its socket holder. 4. Replace the bulb with a new one of the same type - halogen 12volt, 15watt. 5. Push the illuminator body up onto the top piece and twist slightly and it will lock in place. 6. Install the illuminator into the bracket arm by screwing the illuminator lock screw (4) into the illuminator threaded insert. Bottom Illuminator Bulb - to replace the bulb: 1. Remove the stage plate (10) so that you can easily see the fluorescent bulb inside the base (7) - see Figure 4d. 2. Raise the head (15) up so you have more room to work in. 3. Gently remove the illuminator bulb from the bulb holder by pulling outward and moving it left to right gently. 4. Replace the bulb with a new one of the same type - fluorescent 8watt and either 115-volt or 230-volt depending on the model you have. Put the bulb in gently so the pins of the bulb insert properly into the bulb socket holder. Figure 4c Replacing Fuses Figure 4d Two fuses are located on the back of the microscope (see Figure 4b). They are T1A fuses. If the power goes out or will not come on, it is possible one or both of the fuses needs to be replaced. Make sure the power switch is turned off and then use a flat head screwdriver to remove the fuses. If they are blown out, replace them with new fuses and then install the fuse box back in place. 15