104
Maintenance and Repair
Cleaning the Lenses
Figure 18 Cleaning the Source Lens from the Sample Compartment Side
5 Use a canister of compressed oil-free air (like those used to clean
photographic lenses) to further clean the source lens. If you do not have a
compressed air canister, you can use a photographic lens cleaning brush.
6 If you have taken the covers off, replace them.
7 Replace the cuvette holder. Reconnect line power and turn on the instrument.
Check that the spectrophotometer passes its self-test, this means that the
green light on the front panel comes on and that you can do a blank
measurement from your software.
Cleaning the Source Lens from the Lamp Side
It is not recommended to clean this lens at regular intervals, because the
lamp housing is sealed against dust. Therefore the source lens is not very
likely to get dirty from this side. However, if you have cleaned the other
lenses and your intensity test in your operating software still falls below the
specified level, try the procedure below.
1 Turn-off the spectrophotometer and disconnect the power cord.
2 To remove the Deuterium lamp, see “Exchanging the Deuterium or Tungsten
Lamp” on page 96.
3 Dampen a lint-free, surgical cotton swab with reagent grade isopropanol
(isopropyl alcohol) and gently swab the surface of the source lens. Repeat
several times with clean swabs and alcohol each time.
Source lens
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