KERN OBN 141, Инструкция пользователя

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31 OBN-14-BA-e-1510
Centring the lamp (HBO)
When running the HBO lamp for a long time there is the possibility, that the holder of
the lamp is moving out of its centre due to the strong heat development. This
circumstance has to be corrected when it appears, because therefore the field of
view is no longer equally illuminated.
1. Screw in the centring objective on the nosepiece instead of a standard objective.
2. Position the centring objective into the beam path.
3. Set FL module to position G (for this setting there is a relatively subdued light,
convenient for the eyes).
4. When looking into the eyepieces, there is appearing a hair cross and the
decentred light spot (also in cross shape).
5. Use the two centring screws on the lamp housing for moving the light spot into the
centre of the hair cross. (Warning: Heat development on the lamp housing).
Changing the lamp (HBO)
1. Disconnect the FL reflected light unit from the power supply.
2. Check if the lamp housing has cooled down.
3. Loosen the screw for the cover of the lamp housing (only when it is cool).
4. Carefully flip out the lamp holder.
5. Loosen the two fixing screws for the HBO lamp.
6. Replace the old lamp by a new one.
7. Tighten the fixing screws again.
8. Close the cover and fix it with the screw.
The new installed spare lamp may under no circumstances be touched
with naked hands. Impurities will benefit the risk of explosion during
operation.
If there should be nevertheless impurities, the lamp has to be cleaned. We
recommend for this purpose to use a lint-free cloth soaked with an ether alcohol
mixture (Proportion: 70/30).