Principles Of Operation - Betzold VisuLight 1800 Mode D'emploi

3. Principles of operation

Picture 1
3.1 Unfold the projection arm (picture 1) until it clicks.
Picture 3
3.3 Switch on the overhead projector (picture 3), make sure the ventilation slots are not
blocked in order to ensure proper air circulation. The air inlet and air outlet ports have to
be clear of any blockings at all times.
2.
1.
3.2 Unfold the projection mirror before switching on the overhead projector (picture 2)
(very important – otherwise it can lead to overheating).
3.4 The image height is regulated by adjusting the projection mirror (picture 4).
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Picture 2
Picture 4
© Arnulf Betzold GmbH