Metrohm NIRS XDS Transmission OptiProbe Analyzer - Manual (Page 72)

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Gently grasp the corners of the lamp mounting
plate. Push in about 1mm, then rotate clock-wise
(to the right) about 5 mm.
The lamp mounting plate should then be pulled
outward from the mounting studs.
When the lamp mounting plate is free of the
studs, lift the lamp and plate assembly out of the
lamp box as shown.
As a precaution, the lamp may be held by the
wires at this point, to avoid the hot lamp housing
and reflector.
Lift the lamp mounting plate up over the ends of
the lamp wires and remove it.
Discard the old lamp. Do not save it, or it may
become confused with new lamps. It cannot be
reused.
Locate the new lamp which was packed as part
of the accessory kit.
Place the lamp mounting plate over the wires of
the new lamp in the same manner. Let the lamp
mounting plate spring rest on the back of the
new lamp.