Celestron 44202 Instruction Manual page 11

Focusing
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:
1. Rotate the knurled ring on the objective lens housing (12) to the 2x position (as seen looking straight at the
microscope) all the way until it stops. It is best to begin viewing a specimen at low power, then switch to high power
when needed.
2. 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 (14) until the image becomes sharp.
3. While looking through the eyepieces, adjust the interpupillary distance by rotating both eyepieces and the eyepiece
holding mechanisms 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.
4. 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).
5. If higher power is desired, rotate the objective lens housing (12) to the 4x position (as seen looking straight at the
microscope) and rotate as far as you can go and then refocus until the specimen becomes sharp.
6. You can also increase power by changing to the 15x eyepieces. The magnification table will show you the power
combinations available. To change the eyepieces, see items 15 and 16 in Assembling Your Telescope earlier.
7. 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 3c.
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 3d.
2. Raise the head (14) 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 own. Put the bulb in gently so the pins of the bulb insert properly into the bulb socket holder.
Figure 3c
Re placing Fuses
Two fuses are located on the back of the microscope (see Figure 3b). 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.
Figure 3d
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