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a.  Loosen the rack stop screw (Fig. 3) with the 2mm key. 

 

b.  For the 18 series: With the fine focus adjustment (20) at mid-range, focus on specimen 

slide, using only the coarse focus knob (19), firstly with the 4X objective, then with the 
10X. 

 

c.  For the 28 series. Focus on specimen slide using only the coarse focus knob, firstly with 

the 4X objective, then with the 10X. 
 

d.  Rotate the rack stop screw until tight enough to prevent the stage (8) rising further. 

 
 
 

Troubleshooting 
 
ELECTRICAL PROBLEMS 

 

PROBLEM CAUSE 

SOLUTION 

The bulb does not work 

Bulb burned out. 
Wrong bulb. 

Replace bulb. 
Replace by the correct bulb. 

The bulb flickers 

The bulb is not inserted correctly in 
the socket.  

Insert it correctly. 

 

IMAGE QUALITY 

 

PROBLEM CAUSE 

SOLUTION 

No image. 

Nosepiece badly positioned. 
Image too bright. 

Turn, until it clicks into position. 
Reduce light intensity. 

Poor resolution. 

Objective lens dirty. 
Eyepiece lens dirty. 
Specimen slide upside down. 
Cover slip on specimen slides wrong 
thickness.  
Light too bright. 
 
Condenser dirty. 

Clean objective. 
Clean eyepiece. 
Place slide with slip facing up. 
Use 0.17mm thick cover slip. 
 
Reduce light intensity or adjust 
diaphragm aperture. 
Clean condenser. 

Spots in field of view. 

Dirty eyepiece. 
Dirty slide. 
Dirty condenser. 

Clean eyepiece. 
Clean slide. 
Clean condenser. 

Uneven illumination of field  Nosepiece not properly positioned. 

Diaphragm not properly positioned. 

Turn until clicks into position.  
Adjust accordingly. 

 
MECHANICAL PROBLEMS 
 
PROBLEM CAUSE 

SOLUTION 

Does not stay in focus. 

The stage drops down. 

Adjust coarse focus tension. 

Does not stay in focus. 

The  rack  stop  of  the  ascending 
movement of the stage is badly 
adjusted. 

Readjust rack stop screw. 

 
 
 
 
 
 
 
 
 
 

-9- 

Summary of Contents for 18 LED Series

Page 1: ...Instruction Manual 18 28 LED Series Copyright 02 02 Motic Microscopes European Division...

Page 2: ...nosepiece 4 Objectives 16 Arm 5 Moveable stage clip 6 Specimen holder mechanism 7 Fixed stage clip 17 Rack stop screw 18 Specimen holder mechanism support screws 8 Stage 10 Condenser 19 Coarse focus k...

Page 3: ...with additional notes applying specifically to other models in the series Unpacking All components of the microscope have been carefully packed to ensure they reach you in perfect condition We recomm...

Page 4: ...Optimises illumination for enhanced resolution and image contrast 8 Focusing Knobs 19 20 Situated on both sides of the arm of the microscope the larger or coarse focusing knob initially brings the sp...

Page 5: ...necessary to maintain the parfocality of the objectives 4 Variation in interpupillary distance necessitates the readjustment of the diopter scales C Focusing the microscope 1 Revolve the nosepiece 3...

Page 6: ...4 in the optical path 2 This microscope has already been parfocalised although it is possible that small differences exist between the objectives It may then be necessary to adjust the focus slightly...

Page 7: ...ble in shops selling photography equipment 1 Cleaning the eyepiece a Do not remove eyepiece 1 from eyepiece tube 14 b Clean only the outer surface misting the lens with breath c Dry by wiping with len...

Page 8: ...g 3 is situated between the coarse focus knob 19 and the arm 16 Coarse focus tension is adjusted by the factory The optimum point of tension is that which permits the lightest movement of the coarse f...

Page 9: ...e Nosepiece badly positioned Image too bright Turn until it clicks into position Reduce light intensity Poor resolution Objective lens dirty Eyepiece lens dirty Specimen slide upside down Cover slip o...

Page 10: ...uired revision Warrantee All MOTIC microscopes are warranted against any manufacturing defect for a 5 year period Damage occurring by any unauthorised repair work or occurring through misuse or modifi...

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