Swift M3500 SERIES, Manual

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B.    PROBLEM

 – Illumination “hot spots” and uneven brightness in the 

field of view. 

CORRECTION - 

1. Is the Abbe condenser in the correct position?   

2. Are the nosepiece and objective clicked into proper position? 

C.  PROBLEM

 – Image appears “washed out” or weak. 

CORRECTION - 

1.  Slightly close the diaphragm to a smaller aperture                                                                                                                     

2.  Objective lens is dirty. See “Care and Cleaning” Section. 

3.  Eyepiece is dirty. See “Care and Cleaning” Section. 

D.  PROBLEM 

– Dust or hairs seem to be moving in the image. 

CORRECTION – 

The iris diaphragm is not open wide enough. Slowly 

open the diaphragm to increase the size of the opening allowing 

for additional illumination. 

E.    PROBLEM 

- Once the specimen is in focus, it moves out of focus  

CORRECTION 

– Gravity is causing the stage to drift downward,       

causing loss of focus. The focusing tension should be increased to act as a 
brake to prevent this downward drift. The M3500 Series is outfitted with 
a tension collar on the focusing shaft to allow tension to be increased or 
decreased on the Swift slip-clutch system. See page 10. 
 

 
F.  PROBLEM

 – Focusing knobs turn with difficulty. 

CORRECTION

 –   

        1. Loosen the tension collar adjustment.    See page 9. 
        2. The microscope should be disassembled, cleaned and     
            re-lubricated by a qualified, authorized technician.