National 104-LED Instructions For Use Manual - page 6
6
TROUBLESHOOTING
PROBLEM
REASON FOR PROBLEM
SOLUTION
Light fails to operate.
Light switch in off position.
Turn light switch on.
Batteries dead.
Replace batteries.
LED bulb burned out.
Replace LED.
Disc diaphragm has not “clicked”
into proper position and is
blocking light source beneath
stage
Turn disc diaphragm until it “clicks” into
position.
Image does not remain in focus
Cover slip on specimen slide too
thick.
Use 0.17mm thick cover slip.
(No. 1 cover slip)
Slide upside down.
Place slide on stage with cover slip
facing up.
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 lens dirty.
Clean eyepiece lenses.
Specimen slide dirty.
Clean slide.
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. Other than set forth above, National hereby disclaims all
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.
(Revised 11/6/09)