Changing the bulb | Disconnect the lamp cable from the transformer. |
Never touch the bulb when it is hot.
You may sustain burns.
•Do not touch the 6 V/20 W halogen bulb directly with your fin- gers, because finger marks can cause it to crack when heated. Remove finger marks immediately with a cloth dipped in pure alcohol.
Press the spring clips together and pull off the rear part of the housing.
Hold the new bulb in a cloth and push it into position.
Press the spring clips together and close the housing again.
Center the bulb.
Centering the bulb The 6 V/20 W bulb is a powerful source of illumination. The more carefully you set it up, the more uniform the lighting will be. For this reason, recenter a new bulb after fitting it.
Switch on the lamp.
Swing out the diffusing filter.
Pull the condenser lens fully out.
Hold the lamp and release the clamping screw.
Point the lamp vertically downwards at a white sheet of paper so that two filament images are seen.
Retighten the clamping screw.
Using the slotted screw, bring the two filament images into focus.
Displace the filament images so that they are opposite to one another, but in contact.
Swing back the diffusing filter.
44 | Leica M Stereomicroscopes – Illuminations |