45
Gaining access to the instrument enclosure
To perform the following component or sub-assembly
replacement or servicing procedures it will first be necessary to
access the interior of the instrument enclosure. This should be
carried out as follows:-
1. Unplug the mains power cord.
2. Turn off the gas supply at source and switch off the external
air supply (if used).
NOTE: It will not normally be necessary to disconnect the gas
supply and external air supply (if used) from the instrument rear
panel unless the servicing is to be performed at another location
or if sufficient access cannot be gained without doing so.
3. Remove the four screws which secure the instrument top
cover and remove the cover.
Some units have a printer unit fitted to this cover. In such cases
care should be taken that the printer and its connection cables are
not damaged when the cover is removed, particularly if it is left
connected to the instrument during servicing activities. The cover
will also always be attached to the instrument by an earth cable. If
the cable is removed it is essential that the earth cable be replaced
it the same position and the fixing is fully tightened when the cover
is replaced.
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