1600/1800 Manual
33
There’s no difference in polarity of the two legs of Tungsten-halogen lamp.
7) Switch the instrument on. Set the wavelength at 340 nm, insert an empty cuvette, and
blank the instrument. If the energy is low, adjust the lamp by “pulling” or “pushing” it so
that the light beam is focused on the entrance slot of the mono-chromator. Since the
lamp socket is pre-aligned, there will be minimum, if any, adjustment required.
8) Switch the instrument off, re-cover the lamp chamber and tighten the two screws.
9) Reinstall the instrument cover by positioning the front of the cover first and then sliding
the back of the cover over the backside grill plate. Be sure to prevent all wires from
being pinched in the process.
10) Reinstall the four screws and the Cuvette Holder Control Knob.
B. Replace Deuterium Lamp
WARINING: Wear UV protection Glasses before changing the Deuterium Lamp!
1) Turn off and unplug the instrument (VERY IMPORTANT: HIGH VOLTAGE).
2) Remove the four screws on the sides of the spectrophotometer.
3) Remove the Cuvette Holder Control Knob by unscrewing the rod
counterclockwise.
4) Remove the cover of the instrument very carefully and place it in the right of the
instrument.
BE SURE NOT TO PULL PANEL WIRING LOOSE!
5) Unscrew the two screws from the Lamp Chamber (Fig.4-1) and remove its cover.
(Caution: The cover may be HOT
，
，，
，
be sure to wear gloves when act)
6) Disconnecting the 3-wire connector by pulling it straight up. Remember the direction
of the white connector. (Ficture. IV in the following Fig.4-3))
7) Loosen and remove the two white screws (Fig. I and II in the following picture) from
the deuterium flange. Then pull the Deuterium lamp out by pinching its flange. (Note:
Fig. III is a positioning bolt, there’s no need to loosen it)
Zoom in of D2
Fig.4-3
8) Replace a new pre-aligned lamp provided by MAPADA or an authorized MAPADA
IV
III
II
I
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