Unico SQ Series, Service Manual, Page: 84 / 96

Maintenance
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Figure 7.8 Deuterium Lamp
4. Reconnect the connector J7 to the PCB marked SST8.411.128.
5. Re-fit the grey metal protection cover. Temporarily re-fit the main cover and
fix with two screws, one each side.
6. Switch on and remove the grommet from the middle of the rear panel. You
can now look through the Viewing Hole and view the image of the lamp on
the slit. Check the lamp alignment Figure 7.9. If the image is not covering the
slit, the lamp alignment needs adjustment. This requires running the SQ
series without the covers, with high voltages accessible, and so should only
be performed by a suitably qualified engineer.
If adjustment is required, remove the cover and grey protection cover, put on
UV protection glasses and turn on the instrument. Adjust to make the image
central on the slit, Figure 7.9.
CAUTION: Wear UV protection glasses when replacing deuterium lamp.
7. Install the grey metal protection cover and cover of instrument.
8. Re-fit all the screws around the sides of the spectrophotometer.
9. Re-set the lamp usage time. Select Utility, lamp, and re-set D2 usage time.