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3. ELECTRICAL MAINTENANCE
A. 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.
B. To replace bulb, gently lay microscope on side. Using a Phillips (cross-head) type screwdriver, remove 5
each 3mm Phillips screws from bottom of base. Remove base plate to expose bulb. Using a tissue or
cloth to gently grasp the halogen bulb, pull straight out of lamp socket. Your microscope requires a 12
volt, 20 watt halogen bi-pin bulb, available from the dealer from which your purchased your microscope.
This is a common microscope bulb, Osram #64425 or equal. Make certain that new bulb is clean.
Grasping bulb gently with tissue or cloth, insert pins straight into lamp socket. Replace base, and secure
with 5 each 3mm Phillips screws.
TROUBLESHOOTING
PROBLEM
Light fails to operate.
Image does not remain in focus
Image will 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:
#610-155
WF10x eyepiece w/pointer
#800-160
Replacement bulb, 12v 20 watt halogen bi-pin, (Osram #64425 or equal)
LIMITED LIFETIME WARRANTY
Please see our website, www.nationaloptical.com, for complete warranty details and exclusions.
REASON FOR PROBLEM
Outlet inoperative.
AC power cord not connected.
12 volt DC output plug not
plugged into DC power jack.
Lamp burned out.
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.
7
SOLUTION
Have qualified service technician
repair outlet.
Plug into outlet.
Plug 12 volt DC output plug into
DC power jack.
Replace lamp.
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.
(Revised 2/18/09)
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