7
Make sure that illuminator field lens housing and lamp are cool before attempting to remove. Remove illuminator
field lens housing by rotating in a counter-clockwise direction. This housing is secured tightly, to prevent easy
removal by students, so a very firm grip and some strength will be required.
Note that lamp does not screw out. Remove lamp by depressing lamp slightly and rotate in a counter-clockwise
direction until it pops up slightly. Replace with a 110v 20 watt lamp with double contact, medium bayonet base.
This is a standard, commonly used replacement bulb. National #800-102. Carefully wipe lamp to insure it is
clean and free of all fingerprints. Replace field lens housing assembly.
b. Changing bulb on Models 138 and 139 (fluorescent bulb)
Gently lay microscope on side. Using a screwdriver, remove screw in center of each rubber foot on bottom of
base. Remove metal cover plate to expose bulb. Bulb is held in place by spring pressure clips and is removed
by gently pulling bulb straight out from socket. Replace with new bulb. National #800-138. Replace metal cover
plate and rubber feet.
TROUBLESHOOTING
PROBLEM
REASON FOR PROBLEM
SOLUTION
Light fails to operate.
Outlet inoperative.
Have qualified service technician
repair outlet.
AC power cord not connected.
Plug into outlet.
Lamp burned out.
Replace lamp.
Image does not remain in focus
Stage of microscope drops from
its own weight.
Adjust tension control.
Rack stop not set at proper
position.
Adjust rack stop.
Slide upside down.
Place slide on stage with cover
slip up.
Slide cover slip too thick.
Use 0.17mm thick cover slip
(No.1 cover slip)
Poor resolution
(image not sharp)
Objective lenses dirty.
Clean objective lenses.
Eyepiece lens dirty.
Clean eyepiece lenses.
Too much light.
Adjust disc diaphragm.
Spots in field of view.
Eyepiece or condenser lens dirty. Clean lens. ***
Specimen slide dirty.
Clean slide.
***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.
#615-045
WF15x eyepiece w/pointer
#760-045
DIN 60xR objective lens, N.A. 0.90
#910
Graduated mechanical stage, top mounted adjustment knobs
#951
Dustcover, 16” tall x 13”, heavy vinyl with stitched seams.
#975-001
Carrying case, anodized aluminum, fabric lining, accessory pockets, Velcro straps, keyed lock. Fits all
models in series, except dual head models.
#975-002
Carrying case, anodized aluminum, fabric lining, accessory pockets, Velcro straps, keyed lock. Fits dual
head models.
#975-138
Carrying case, heavy plastic w/foam liner. Fits all models in series, except dual head models.
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