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TROUBLESHOOTING
PROBLEM
Light fails to operate.
Image does not remain in focus
Poor resolution
(image not sharp)
Spots in field of view.
OPTIONAL ACCESSORIES AND PARTS:
#800-001
Replacement LED light
#802-002
A/C adapter, 120 volt 60Hz (optional)
WARRANTY - 5 YEAR LIMITED WARRANTY
Manufacturer warrants this instrument to be free from defects in material and workmanship under normal
use and service for 5 years after purchase. This 5-year limited warranty excludes all internal electrical
components which are only warranted for a period of one year. Warranty does not cover bulbs, power
supplies, rechargers, fuses, batteries, electrical cords, damage resulting from abuse or misuse, repairs or
alterations performed by other than authorized repair technicians or damage occurring in transit.
Warranty does not cover lenses that have become inoperable due to excessive dirtiness as a result of
misuse or lack of normal maintenance.
warranties, expressed or implied, of fitness for a particular purpose.
For warranty service, instrument should be well packed to avoid damage in transit, accompanied by a
description of the difficulty and return instructions, and shipped postage prepaid to address below.
National will repair or replace at no charge and return postage prepaid. For customers living outside the
United States, National will provide standard warranty service. However, all inbound & outbound costs
are the responsibility of the consumer. If failure was caused by misuse, alterations, accident, or abnormal
conditions of operation, an estimate for repairs will be submitted for your approval prior to work being
performed.
This warranty gives you specific legal rights, and you may also have other rights that vary from state to
state.
If you have questions concerning this product or warranty, contact the dealer from which it was
purchased.
You may also contact National at the address or phone number on the front page of this
manual and ask for warranty assistance.
REASON FOR PROBLEM
Light switch in off position.
Batteries dead.
LED bulb burned out.
Disc diaphragm has not "clicked"
into proper position and is
blocking light source beneath
stage
Cover slip on specimen slide too
thick.
Slide upside down.
Objective lenses dirty.
Eyepiece lens dirty.
Too much light.
Eyepiece lens dirty.
Specimen slide dirty.
Other than set forth above, National hereby disclaims all
6
SOLUTION
Turn light switch on.
Replace batteries.
Replace LED.
Turn disc diaphragm until it "clicks" into
position.
Use 0.17mm thick cover slip.
(No. 1 cover slip)
Place slide on stage with cover slip
facing up.
Clean objective lenses.
Clean eyepiece lenses.
Adjust disc diaphragm
Clean eyepiece lenses.
Clean slide.
(Revised 11/6/09)
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