Image tinged yellow
Blue filter not used
Use blue filter
Insufficient illumination
brightness
Condenser aperture too small
Re-adjust the aperture
Condenser position too low
Correct positioning
2. Mechanical
Symptoms
Causes
Countermeasures
Image not focusable with
high power objectives
Slide upside-down
Turn slide over
Cover glass too thick
Use coverglass of specimen
thickness ( 0.17mm )
High power objective
contacts slide when
changed-over from low
power
Slide upside down
Turn slide over
Coverglass too thick
Use coverglass of specimen
thickness ( 0.17mm)
Specimen movement
unsmooth
Mechanical stage not securely
fastened
Tighten all fastener
Binocular images not
integrated
Interpupillary distance not
correctly adjusted
Adjustment
Excessive eye fatigue
Incorrect diopter adjustment
Correct adjustment
Inadequate brightness or
illumination
Adjust brightness with control
dial
3. Electrical
Symptoms
Causes
Countermeasures
Lamp does not light when
switched on
No electrical power
Check power cord connection
Lamp bulb not inserted
Insert correctly
Lamp failure
Replacement
Sudden lamp failure
Unspecified lamp bulb used or
input voltage too high
Replace with specified lamp
bulb. If the same symptom
occurs after replacing the
lamp, contact your dealer
Insufficient illumination
brightness
Unspecified lamp bulb used
Replace with specified lamp
bulb
Voltage too low
Increase brightness with
control knob
Flickering or unstable
lamp brightness
Lamp bulb about to fail
Replacement
Lamp bulb not correctly inserted
into socket
Check for positive connection
VIII. Care and Maintenance
1. Cleaning Lenses
Dust is best removed with a soft brush or gauze.