Observation
Cause
Remedy
8. Objective hits the specimen when
The specimen slide is upside down
Set the specimen correctly with the
an objective is switched to a higher
cover glass facing upwards
magnification objective
The cover glass is too thick
Use a cover glass with thickness of
0.17mm
The stage is raised too high
Lower the stage
The slide has slipped from the slide
Re-position the slide in the slide
holder
holder
Slide is of excessive thickness
Use slides with thickness between 0.9
and 1.4mm
9. Bulb does not turn On
Bulb is not mounted
Attach a bulb
Bulb is blown
Replace the bulb
The power cord is unplugged / Not firmly Ensure power cord is securilly plugged
secured
into the box wall outlet
Fuse is blown
Check and replace with live fuse
10. Bulb blows easily
The specified bulb is not used
Replace with the specified bulb
11. Field remain dark even Bulb is on
In the Exintetion Position
Remove Analyzer from light path by
switch Analyzer lever to out “O”
position.
Swing out Polarizer from light path.
Bertrand Lens in the Light Path (BL)
Swing out Bertrand Lens to out “O”
position i.e. away from light path.
12. Conoscopic image is not visible
Bertrand lens is away from light path.
Bring Betrand Lens in light path at “BL”
position.
Condenser Top Lens not in the light
Swing in Top Lens of condenser in the
path.
light path.
Using lower magnification objective.
Go to specified objective magnification
i.e. from 20x to 100x
13. Extinction failure
Analyzer & Polarizer out of the light
Bring Analyzer & Polarizer in the light
path.
path.
Analyzer & Polarizer are not in cross
Adjust Polarizer by rotating to get
positions.
complete extinction.
Lx POL
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