Troubleshooting:
Page 20
Mechanical & Electrical Troubleshooting
Problem
Cause
Solution
Can not get the objective
lens to focus.
The cover glass is not facing up.
The cover glass is not standard thickness.
Put the cover glass face up.
Objective touches the
cover glass when
rotating the nosepiece.
The cover glass is not facing up.
Stage drifts or falls.
Tension knob is too loose.
Coarse focusing limit knob is locked.
Tighten tension knob slightly.
Loosen coarse focus limit
knob.
Coarse focusing knob
won’t lower far enough.
The base of the condenser is too low.
Raise the condenser.
The slide is not positioned correctly.
The movable specimen holder is not
attached properly.
Adjust specimen holder.
Stage is not fastened properly.
Reattach the stage.
Power is not turned on.
Check power cable connection.
Bulb is not installed properly.
Check light connection.
Bulb is burned out.
Replace Bulb .
Slide will not move
smoothly.
The connector pins or the wires for the
bulb are not connected properly.
Check wire connections and
connector pins for the bulb.
Bulb flickers or the
brightness is not stable.
Use cover glass thickness
0.17mm.
Put the cover glass face up.
The cover glass is not standard thickness.
Use cover glass thickness
0.17mm.
Coarse focusing knob is
too tight.
Tension knob is too tight.
Loosen tension knob slightly.
Coarse focusing knob
won’t raise higher.
Adjust slide position.
Image jumps when stage
is touched.
Light does not work.
Field of view is not bright
enough.
Rheostat adjustment is turned down.
Adjust the rheostat control.
Bulb burns out quickly.
Incorrect bulb is being used.
Replace bulb with part #
12v100wH.
Incorrect bulb is being used.
Replace bulb with part #
12v100wH.
The bulb needs to be replaced.
Replace bulb with part #
12v100wH.
