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5.

 

Troubleshooting Guide 

GENERAL PROBLEMS

 

Problem

 

Cause

 

Solution

 

Lamp does not 
light when 
switched on 

No electrical power   

Check power cord connection   

LED or power unit dead 

Replace LED light

 

Fuse blown out 

Replace fuse 

Darkness at the 
periphery or 
uneven 
brightness in the 
field of view 

Revolving nosepiece not in click 
stop position 

Revolve the nosepiece to click-stop 
position by swinging the objective 
correctly into the optical path 

Dirt or dust on 
the view 

Dirt or dust on the eyepiece, 
condenser, objective, collector lens 
or specimen 

Clean the lens with a lens cleaning 
paper 

Poor image 
quality or not 
able to get 
focused image 

No slide cover attached to the slide  Attach a 0.17mm slide cover 

Slide cover is too thick or thin 

Use a slide cover of the appropriate 
thickness (0.17mm) 

Slide may be upside down 
(specimen at the bottom)

Turn slide over so the cover-glass faces 
up

Diopter adjustment is not set 
properly 

Readjust the diopter settings 

Condenser aperture is closed or 
open too much 

Open or close properly 

Condenser is positioned too low 

Position the condenser upward 

Specimen rises from stage surface 

Secure the specimen in the slide holder 

Revolving nosepiece is not in the 
click-stop position

Revolve the nosepiece to the click-stop 
position

Lamp intensity is too high or low 

Adjust the light intensity by rotating the 
intensity control dial 

Slippage of focus 
when using the 
coarse focusing 
knob Fine focus 
is ineffective 

Tension adjustment is set too low 

Increase the tension on the focusing 
knobs

Tension adjustment is set too high 

Loosen the tension on the focusing 
knobs 

 

Summary of Contents for MD8211E30

Page 1: ...User Manual Digital Compound Binocular LED Microscope Model MD8211E30 MicroscopeNet com...

Page 2: ...Table of Contents i Caution 1 ii Care and Maintenance 2 1 Components Illustration 3 2 Installation 4 3 Operation 6 4 Specifications 8 5 Troubleshooting Guide 9...

Page 3: ...rface 4 If any specimen solutions or other liquids splash onto the stage objective or any other component disconnect the power cord immediately and wipe up the spillage Otherwise the instrument may be...

Page 4: ...ally using an air stream from an air bulb If dirt remains on the optical surface use a soft cloth or cotton swab dampened with a lens cleaning solution available at camera stores All optical lenses sh...

Page 5: ...bs 3 Eyepiece Tube 10 USB Cable 17 Power Switch 4 Viewing Head w Built in Camera 11 Head Lock Thumb Screw 18 Brightness Intensity Dial 5 Objective 12 Nosepiece 19 Condenser Lock Thumb Screw 6 Slide Ho...

Page 6: ...plastic cases and turn each one clock wise into the holes on the nosepiece Install the 4X objective into the nosepiece first Then in a counter clockwise direction rotate the nosepiece and install eac...

Page 7: ...e Fig 3 a 3 Open the board and find the LED lamp See Fig 3 b 4 Loosen the 2 screws and unplug the LED connector 5 Replace the dead LED lamp with a new one 6 Tighten the 2 screws and plug in the LED co...

Page 8: ...cimen is close to the objective 2 Turn the coarse focus knob until the specimen is in focus Then use the fine focus knob to obtain a sharp image You may now switch to another magnification objective 3...

Page 9: ...adjusted to smaller size the contrast will be increased and the depth of field will be increased as well Turn up the intensity of the light if the image is too dim 3 8 Adjusting focus knob tension Th...

Page 10: ...0 17 spring 40X 0 65 160 0 17 spring Condenser Abbe NA 1 25 w iris aperture diaphragm and filter holder Rack and pinion focus adjustment Focus Mechanism Coaxial coarse and fine focusing knobs on both...

Page 11: ...7mm slide cover Slide cover is too thick or thin Use a slide cover of the appropriate thickness 0 17mm Slide may be upside down specimen at the bottom Turn slide over so the cover glass faces up Diopt...

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