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3. ELECTRICAL MAINTENANCE
The extent of electrical maintenance, by other than a qualified technician, should be bulb replacement. BE CERTAIN
TO TURN SWITCHES OFF AND REMOVE PLUG FROM POWER SOURCE OUTLET BEFORE CHANGING
BULBS.
a. Replacing LED bulb
To remove the illuminator field lens housing, use 0.90mm "L" type hex key wrench supplied with your microscope.
Loosen the two hex socket set screws located on illuminator lens housing. Remove housing to expose the LED
"bulb" by lifting it up and away from base of housing. Remove bulb by grasping the plastic base of bulb and
gently pulling straight up. Insert new LED "bulb", replace illuminator lens housing and tighten the two hex screws
to secure lens housing to base of housing.
b. Replacing fuse
The fuse is located at the rear right side of microscope base. To remove fuse from holder, insert a 6mm
screwdriver blade into slot located in rear of fuse holder cap. Slightly depress and rotate screwdriver ¼ turn in
direction of arrow, release pressure on screwdriver to release fuse. Pull cap and fuse out of fuse holder. Insert
proper fuse into fuse cap. Insert fuse cap into fuse holder. Using screwdriver, rotate fuse cap assembly in
opposite direction of arrow until slot engages, depress fuse cap and rotate ¼ turn to lock into fuse holder.
TROUBLESHOOTING
PROBLEM
Light fails to operate.
Image does not remain in focus
Image does not focus
Poor resolution
(image not sharp)
Spots in field of view.
***Spots in field of view can also result from dirt on inside of eyepiece. It is recommended that you have
service technician clean inside of lens.
OPTIONAL ACCESSORIES AND PARTS:
#610-045R
WF10x eyepiece w/reticle, 10mm/100div.
#800-001
Replacement LED bulb
#800-160
Replacement fuse, 0.5 amp, time delay
Dustcover, 16" tall x 13", heavy vinyl with stitched seams.
#951
LIMITED LIFETIME WARRANTY
Please see our website,
REASON FOR PROBLEM
Outlet inoperative.
AC power cord not connected.
LED bulb burned out.
Fuse blown.
Stage of microscope drops from
its own weight.
Rack stop not set at proper
position.
Slide upside down.
Slide cover slip too thick.
Objective lenses dirty.
Eyepiece lens dirty.
Too much light.
Eyepiece or condenser lens dirty.
Specimen slide dirty.
www.nationaloptical.com
for complete warranty details and exclusions.
8
SOLUTION
Have qualified service technician
repair outlet.
Plug into outlet.
Replace LED.
Replace fuse.
Adjust tension control.
Adjust rack stop.
Place slide on stage with cover
slip up.
Use 0.17mm thick cover slip
(No.1 cover slip)
Clean objective lenses.
Clean eyepiece lenses.
Adjust disc diaphragm.
Clean lens. ***
Clean slide.
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