Section 5. Maintenance
Cleaning the Optical Bench
The LI-840A 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-840A off.
Remove the six screws on the LI-840A 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.
There are ribbon cables connected to the circuit boards on the source and detector housings, as
shown below. Pull straight out on the connector that is attached to each ribbon cable. The
optical bench can now be removed from the foam casing.
Section 5. Maintenance 5-1
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