Maintenance 5-1
5
Maintenance
Cleaning the Optical Bench
The LI-820 optical bench can be removed and cleaned if necessary. If the optical path
becomes dirty it may become difficult to span the analyzer. Excessive zero drift may also be
observed if the optical path becomes dirty. Follow these steps to clean the optical bench:
1. Turn the LI-820 off. Remove the six screws on the LI-820 top panel and remove the
cover. Note that these screws are not molded into the case and may fall out.
2. Unscrew the tube retaining nuts on the inner air port fittings. Remove the tubing from
both air ports. Leave the tubing connected to the source and detector housings.
3. There are ribbon cables (Figure 5-1 below) connected to the circuit boards on the source
and detector housings. Pull straight out on the connector that is attached to each ribbon
cable. The optical bench can now be removed from the foam casing.
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