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MAINTENANCE 

 

WARNING:  For your own safety, turn power switch off, remove plug from AC power source and remove charging cord 
from microscope input before maintaining your microscope.  If the power cord, recharger is worn, cut or damaged in 
any way, have it replaced immediately to avoid shock or fire hazard. 

 
1.   OPTICAL MAINTENANCE

 

 

a.  Do not attempt to disassemble any lens components.  Consult a microscope service technician when any repairs not 

covered by instructions are needed. 

 
b.  Prior to cleaning any lens surface, brush dust or lint off lens surface using a camel hairbrush.  You can also use an ear 

syringe or canned compressed air, such as that sold by most computer stores. 

 
c. 

Do not remove eyepieces or objective lenses to clean.  Clean only the outer lens surface.  Breath on lens to dampen 
surface, then wipe with lens paper or tissue or use a cotton swab moistened with distilled water.  Wipe lenses with a 
circular motion, applying as little pressure as possible.  Avoid wiping dry lens surface as lenses are scratched easily.  
If excessive dirt or grease gets on lens surfaces, a small amount of Windex can be used on a cotton swab or lens 
tissue.  To clean objective lenses, do not remove objectives from microscope.  Clean front lens element only, following 
same procedure. 

 

NOTE:  Fingerprints or other matter on the front lens element of the objective lens is the single most common reason 
that you will have difficulty in focusing the microscope.  Before having costly servicing done, or before returning to 
National for “warranty repair”, make certain to examine the front lens element with a magnifying glass or eye loupe for 
the presence of such contaminants.  If a microscope is returned to National for warranty repair, and it is determined 
that such contaminants are the problem, this is not covered under warranty and National will submit a cost estimate for 
cleaning. 

 

2.  MECHANICAL MAINTENANCE 
 

a.  The rack stop screw has been pre-adjusted at the factory and should not require re-adjustment.  However, if you do 

attempt re-adjustment, note the following procedure. 

 
       Loosen round knurled locking nut by turning counter clockwise then, using a 2mm “L” type hex key wrench, loosen 

rack stop socket set screw.  With fine focus adjustment at mid-range, focus on standard slide until sharp image is 
obtained.  Rotate rack stop set screw in clockwise direction until tight, tighten locking nut.. 

 
b.  Coarse focus tension adjustment prevents the stage from drifting down from its own weight and causing the image to 

move out of focus. This has been adjusted at the factory, but over the course of time it may loosen and cause the 
stage of the microscope to slip downward on the focusing block. 

 
       The tension adjustment collar is located between arm and coarse focus knob on right side of microscope.  Using a 

0.9mm “L” type hex key wrench, loosen the set screw located in the hole on tension adjustment collar. Turn collar 
clockwise to tighten tension, counter-clockwise to loosen tension. Use of a wide rubber band will provide a better grip 
on the tension adjustment collar.  After adjusting, tighten the setscrew to lock collar in place. 

 
       NOTE:  It is recommended that you leave the tension as loose as possible for ease of focusing, yet not so loose that it 

permits the stage of microscope to drift downward from its own weight and cause the microscope to “drift” out of focus. 

 
c. 

Metal parts:  Use a clean, damp cloth to remove dust or dirt from metal parts, followed by a dry cloth. 

 
3.  ELECTRICAL MAINTENANCE  
 

a.  The extent of electrical maintenance, by other than a qualified technician, should be LED replacement, battery 

recharging and battery replacement.  Before maintenance, be sure that recharger is not connected to microscope. 

  
b.  Recharging batteries: 

Plug output cord from battery charger into DC recharging socket located on back of microscope base.  Your automatic 
switching recharger operates on 100 to 240 volts AC 50/60 Hz. Plug charger into your AC wall outlet.  Battery 
recharger is also equipped with an automatic “trickle charge” feature, the red LED indicator lamp located on recharger 
will be illuminated when batteries are receiving maximum charge.   After batteries are charged, the red LED indicator 
lamp will turn to green and charger automatically switches to “trickle charge”.   The charger can be left plugged in, but 
for safety reasons it is a good idea to disconnect the charger from the AC wall outlet and the output cord from 
recharging socket after 12 hours.  Batteries and charger may feel warm when charging, and unplugging the recharger 
is a safety precaution.   

 

Summary of Contents for 158-LED

Page 1: ...entific Instruments Inc 11113 Landmark 35 Drive San Antonio Texas 78233 Phone 210 590 9010 Fax 210 590 1104 INSTRUCTIONS FOR MODEL 158 LED COMPOUND MICROSCOPES Copyright 11 09 04 National Optical Scientific Instrument Inc ...

Page 2: ...erpupillary adjustment grips located on both left and right side of diopter scale Mark on side of eyepiece tube for indexing diopter reading Head locking screw Arm of microscope stand Knobs controlling X and Y movement of mechanical stage Coarse focus knob Fine focus knob Power on off switch Tension adjustment collar behind focus knob on left side Rack stop adjustment screw Knurled locking screws ...

Page 3: ...son repack in the styrofoam container and then pack the styrofoam in other corrugated shipping container for optimum protection Use of the styrofoam alone will not provide adequate protection in transit and will void your warranty DESCRIPTION OF COMPONENTS 1 EYEPIECE ocular lens Lens closest to the eye magnifies the primary image formed by the objective lens One eyepiece is equipped with a pointer...

Page 4: ... into DC recharging socket located on back of microscope base Your automatic switching recharger operates on 100 to 240 volts AC 50 60 Hz Plug charger into your AC wall outlet Battery recharger is equipped with an automatic trickle charge feature the red LED indicator lamp located on recharger will be illuminated when batteries are receiving maximum charge After batteries are charged the red LED i...

Page 5: ...base limiting the light output 2 When using 4x and 10x objectives the special neutral filter must be in optical path 3 When using the higher power 40x and 100x objectives remove filter from optical path 4 To remove filter grasp filter holder knob and swing out filter holder h Changing magnification 1 Rotate revolving nosepiece to position 10x objective into optical path 2 This microscope has been ...

Page 6: ... rack stop socket set screw With fine focus adjustment at mid range focus on standard slide until sharp image is obtained Rotate rack stop set screw in clockwise direction until tight tighten locking nut b Coarse focus tension adjustment prevents the stage from drifting down from its own weight and causing the image to move out of focus This has been adjusted at the factory but over the course of ...

Page 7: ...ours so you don t have to do this exercise very often To open the illuminator field lens housing use hex wrench supplied with your microscope to loosen hex screw on side of lens housing Remove lens housing to expose LED bulb Remove bulb by grasping the plastic base of bulb and gently pulling straight up Insert new LED bulb replace lens housing and tighten hex screw to secure lens housing in place ...

Page 8: ... service for 1 year from date of purchase It does not cover damage resulting from abuse or misuse repairs or alterations performed by other than the manufacturer or damage occurring in transit Software 90 day limited warranty Manufacturer warrants software to be free from defects in material and workmanship under normal use and service for 90 days from date of purchase Other than set forth above N...

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