12-6
Maintenance
11. The optical bench can now be removed. The bench will appear as shown
below.
Note that there are O-rings on both ends of the optical bench. It is a good
practice to replace the O-rings when cleaning or replacing the optical path.
Optical
Path Swab
Reflector
Swab
12. There are a number of swabs in the spare parts kit (see at left). Dip one
end of the swab into a 50:50 ethanol/water solution and carefully swab
both ends of the optical bench, until there is no more visible residue. A
mild solution of dish washing type soap and water will also work. Do
not use abrasive cleansers, as they can irreparably damage the gold
plating on the optical bench.
13.
Use a reflector swab and carefully swab the gold-plated concave surface
of the source housing, if necessary.
14. If you need to clean out the hose barbs and/or replace the tubing
connected to the source and detector housings, use a small pair of
diagonal cutters to remove the tubing from the hose barbs. Use the
cutters to pinch the tubing parallel to the hose barb axis, and then pivot
the cutters over the hose barb tip; the tubing will pull off of the hose
barb. Be very careful not to cut the tubing or scratch the hose barb with
the cutters, as subsequent tubing connections may leak.
15. Let the optical bench dry. Re-assemble the bench, making sure the O-rings
are in place on both ends of the bench. Note that the orientation of the
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