background image

 
MAINTENANCE 

 

WARNING:  For your own safety, turn switch off and remove plug from power source before maintaining 
your microscope.  If the power cord 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 hair brush.  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. 

 
      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. 

 
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 
rubberband  will provide a better grip on the tension adjustment collar.  After adjusting, tighten the set screw 
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. 

Содержание 156

Страница 1: ...c Instruments Inc 6508 Tri County Parkway Schertz Texas 78154 Phone 210 590 9010 Fax 210 590 1104 INSTRUCTIONS FOR MODELS 156 156 S 157 COMPOUND BIOLOGICAL MICROSCOPES Copyright 1 2 01 National Optical Scientific Instrument Inc ...

Страница 2: ...iece Knurled diopter ring Sliding interpupillary 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 and fuse holder on back of base Tension adjustment collar behind focus...

Страница 3: ...g to another location or shipped for repairs 156 Monocular Stand with head one eyepiece one rubber eyeshield three objectives condenser specimen holder blue filter dust cover 0 9mm L type key wrench for eyepiece socket set screw and tension adjustment collar and 2mm L type key wrench for rack stop adjustment 156 S Monocular Stand with head one eyepiece one rubber eyeshield four objectives condense...

Страница 4: ...o one interpupillary distance is corrected for your eyes Check the interpupillary scale and note index reading for future reference in case other users will be changing this adjustment from time to time C Adjust the diopter scales located on each eyepiece tube to the same numerical value as indicated on the interpupillary scale This must be done in order to maintain parfocality of objective lenses...

Страница 5: ...n handling the filter do not touch lens surfaces as fingerprints and smudges will result in poor images H Changing magnification a Rotate revolving nosepiece to position 10x objective into optical path b This microscope has been parfocalized which allows changes from one objective to another while requiring only a slight adjustment of the fine focus controls c When changing to the 40x and 100x obj...

Страница 6: ...ye 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 attem...

Страница 7: ...ages depress fuse cap and rotate turn to lock into fuse holder 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 Fuse blown Replace fuse 0 5 amp time delay 5mm dia X 20mm long Image does not remain in focus Stage of microscope drops f...

Отзывы: