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Reassemble the shutter onto the HS20 using one M3 x 10 Cap Head Screw and the brass M3 Crinkle
Washer. Use Loctite 222 on the Cap Head Screw. Do not fully tighten the cap screw, instead adjust
the screw to allow the shutter to rotate smoothly. Leave assembly 24 hours for Loctite 222 to fully cure.
The optical surfaces should only be cleaned using one of the materials prescribed below.
Do use
Ethanol, methanol, propanol and combinations
Spectacle cleaning fluid
Non-abrasive, lint-free cleaning wipes
Microfibre cloths
Under no circumstances should the following be used for cleaning as they will permanently damage
the optics.
Do not use
Acetone
Abrasive materials
Chlorinated solvents
Benzine
Optical cleaning procedure
1. Apply one of the recommended cleaning solutions to the lens cleaning tissue.
2. IMPORTANT Allow cleaning solution to evaporate so that tissue is only damp rather than wet.
(when too much cleaning solution is used it can creep into internal joints within the optic further
where it cannot be removed.
3. Gently wipe the optic with the lens cleaning tissue from the centre of the optical surface to the
outside of the optic.
4. Re-wipe the optic with a piece of dry cleaning tissue.
5. Observe contamination on optic, if significant contamination still present repeat from 1.
Optical system realignment
To realign the HS20 laser head and interferometer optics the principles discussed in section 5.1
should be adhered to.
Routine checking of safety functions
It is advisable to re-check the correct operation of the system safety functions on a regular basis to
ensure that no degradation of safety has occurred through wiring, connector, or component failure.
This is achieved by repeating the testing procedures which are detailed in section 6 (pre-integration
testing).
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