PerkinElmer LAMBDA 650 Hardware Manual page 63

An operating hours counter is incorporated in the red deuterium lamp lead. By means of a
NOTE:
gap between the two display bars it is possible to read off the number of hours that the lamp
has been in operation. One scale division corresponds to approximately 100 hours.
1. Switch off the spectrometer and disconnect the line power cord, if necessary wait until
the lamps and lamp compartment have cooled to room temperature.
2. Remove the lamp compartment cover by lifting vertically from the handhold on the rear
of the instrument.
3. Remove the lamp cover by undoing the two screws and lifting vertically.
4. Unplug the deuterium lamp connector by squeezing in the two lugs at each side of the
connector and carefully pulling the connector vertically upward.
Deuterium lamp assembly
Figure 23 Removing the deuterium lamp connector
5. Remove the lamp assembly from the bracket by slackening the thumbscrew and pulling
the lamp mount vertically upward.
Save the thumbscrew for use with the new lamp assembly.
6. Unpack the new lamp assembly, taking care to hold it only by the metal mount to
prevent finger marks on the lamp window.
7. Slip the slot at the base of the lamp mount over the stud on the bracket in the lamp
compartment and then secure with the thumbscrew.
8. Plug the deuterium lamp connector into the socket.
The socket in the lamp compartment is asymmetric; the deuterium lamp connector can be
NOTE:
inserted in one direction only. Make certain that the connector is the right way round before
inserting it. Never attempt to insert the connector by force.
9. Wipe the lamp window with a soft cloth moistened with alcohol to remove dirt, since
this would otherwise be burned in when the lamp is hot.
10. Replace the lamp compartment cover by lowering into place.
This completes the deuterium lamp replacement procedure.
Due to the pre-aligned mounts, the alignment of lamps after installation is generally so good
NOTE:
that further alignment is not required.
Lambda 650/850/950 Hardware Guide . 63
Thumbscrew (deuterium lamp)
Deuterium lamp connector