Troubleshooting - Accu-Scope EXC-400 Manual

TROUBLESHOOTING

Under certain conditions, performance of this unit may be adversely affected by factors other than defects. If a
problem occurs, please review the following list and take remedial action as needed. If you cannot solve the
problem after checking the entire list, please contact your local dealer for assistance.
OPTICAL
Problem
The field of view is dark, but
the bulb is bright
Darkness at the periphery or
uneven brightness of view field
Dirt or dust on the view field
Poor image quality
®
ACCU-SCOPE
Cause
Field diaphragm is not open enough
Condenser is too low
Condenser is not centered
Light path selection lever is in the
trinocular position
Revolving nosepiece not in click
stop position
Dirt or dust on the lens - eyepiece,
condenser, objective, collector lens
or specimen
No cover glass attached to the slide
Cover glass is too thick or thin
Slide maybe upside down
Immersion oil is on a dry objective
(especially the 40xR)
No immersion oil used with100xR
objective
Air bubbles in immersion oil
Condenser aperture is closed or
open too much
Condenser is positioned too low
73 Mall Drive, Commack, NY 11725 • 631-864-1000 • www.accu-scope.com
EXC-400 MICROSCOPE SERIES
Corrective Measure
Open the field diaphragm more
Adjust the condenser height
Center the condenser
Push the light path selection level into
the binocular position
Revolve the nosepiece to click stop
position by swinging the objective
correctly into the optical path
Clean the lens
Attach a 0.17mm cover glass
Use a cover glass of the appropriate
thickness (0.17mm)
Turn slide over so the cover glass
faces up
Check the objectives, clean if
necessary
Use immersion oil
Remove bubbles
Open or close properly
Position the condenser slightly lower
than the upper limit
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