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objective lenses. In normal circumstances you will
not have to adjust this. However, if it falls out of
adjustment or you are using a thinner slide that
cannot be focused, follow these steps:
1. Loosen the round
knurled
locking
nut by turning it
counter-clockwise.
You may need to
use
needle-nose
pliers for this.
2. Loosen the stop
screw.
3. Focus on a standard slide until you obtain a
sharp image.
4. Tighten the stop screw by turning it clockwise
until it stops, then turn it back a half turn.
5. Lock into position by tightening the locking nut.
6. Note: The higher the stop screw is, the higher
the stage will rise.
Changing the Bulb
Your microscope bulb should last for years—
approximately 50,000 hours of continuous use. If it
breaks or it burns out, follow these steps for
replacing it:
1. Obtain the correct LED replacement bulb (our
item MI-BULB14).
Troubleshooting
If you are experiencing difficulty with your microscope, try these troubleshooting techniques:
Problem
1. The AC power cord is not connected. Connect the cord to an outlet.
Light fails to
2. The bulb is burned out. Replace the bulb. (See "Changing the Bulb," p. 7.)
operate
3. The power source outlet is inoperative. Have a qualified electrician repair the outlet.
4. The incorrect bulb is installed. Replace with the correct bulb.
5. The bulb is oriented wrong. Rotate the bulb 180° and re-insert.
1. The bulb is not properly inserted into the socket. Properly insert the bulb.
Light flickers
2. The bulb is about to burn out. Replace the bulb.
3. The connection at the AC outlet is loose. Have a qualified electrician repair the outlet.
No image
1. The nosepiece is not indexed properly. Move revolving nosepiece until the objective
2. The light is too bright. Adjust the diaphragm.
Unable to
1. The slide coverslip is too thick. Use 0.17 mm thick (No. 1) coverslip.
2. The stage drops under its own weight. Adjust tension of coarse focus knob. (See
focus slide
3. The slide is upside down. Place the slide on the stage with the coverslip facing up.
4. The stage stop is not set at the proper position. Adjust the stage stop. (See
© Home Training Tools Ltd. 2012
Stop screw
Locking nut
Possible Reason and Solution
lens clicks into position.
"Adjusting Tension," p. 7.)
"Adjusting the Stage Stop," p. 7.)
Page 7 of 8
2. Unplug your microscope from the power
supply and allow it to cool before replacing the
bulb.
3. Twist illuminator housing counter-clockwise to
remove. Pull out old bulb and insert new bulb.
4. Plug microscope into a power supply and turn
it on, ensuring the bulb lights up. If it doesn't,
repeat step 2, then lift bulb out, rotate it 180°
and re-insert. Repeat step 4.
5. Replace illuminator housing.
Adjusting Tension
Although coarse focus tension is pre-adjusted
by
the
manufacturer,
temperature changes and
normal use may cause it
to fall out of adjustment,
allowing the stage to drift
down
under
its
own
weight and moving the
image out of focus. The tension adjustment collar
is located between the microscope arm and the
coarse focus knob on the right side (when the
stage is facing you). To adjust the tension, follow
these steps.
1. To tighten tension, use the provided C-wrench
to turn the collar clockwise.
2. Only tighten the tension knob enough to keep
the
stage
from
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Tension collar
drifting
downward.
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