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B. Electrical maintenance. 

WARNING:  FOR YOUR SECURITY, SWITCH OFF AND REMOVE PLUG FROM POWER SOURCE OUTLET BEFORE MAINTAINING YOUR MICROSCOPE IN ORDER TO AVOID SHOCK OR FIRE HAZARD. 

1. Changing the bulb. 

2. Changing the fuse. 

a. Lay the microscope on its side, taking extreme care especially with the eyepieces (1) and the specimen slide holder (6). 

b. Unscrew the screw pointed out by the arrow. (Fig. 5). 

c. Open the cover to give access to the bulb. 

d. With a cloth, carefully grasp the bulb and gently pull, to disconnect it from its socket. 

e. Do not touch the replacement bulb with fingers. Use a clean cloth and insert the pins of the bulb into socket. 

f. If the bulb is touched accidentally, clean it , as finger contact may affect light transmission, and the life span of the bulb. 

g. Close hinged door and tighten locking screw. 

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Cap of access 

a. Using a flat screwdriver, gently press on the slot located on the fuse cap (Fig. 1) and make a ¼ turn in the direction indicated by the arrow. 

b. Release pressure on the loosened fuse cap, and remove completely. 

c. Remove the fuse located on the cap, by pulling it out, and insert new fuse. Ensure that a 0.5 Amp. fuse is used. 

d. Replace the fuse cap. 

e. Repeat step (a), this time making a ¼ turn in the opposite direction to that indicated by the arrow. The cap must be closed securely. 

C. Mechanical maintenance. 

1. Adjusting the tension of the coarse focus control. 

The tension adjustment control for the coarse focus knob (Fig.5) is located between the coarse focus knob (19) and the arm (17). The coarse focus knob tension is pre-adjusted by the manufacturer. The ideal tension point is that which permits coarse focus knob to move as loosely as possible, without the stage (8) moving down on its own. 

