* Move the guide mirror out of the beam.
* Move the rear-of-slit mirror into the beam (''Lamp/Mirror Settings'' pane, RoS mirror change from ''Out of beam'' to ''In beam'').
* Turn on the slit illumination (in the "''Instrument Setup" '' pane, "''Change" '' to turn on the lamp). Tune the exposure time/LUT sliders on the TCS until you can clearly see the slit running horizontally across the acquisition image, approximately halfway up.
* Using the hand paddle, move the telescope to place the star on the slit, approximately one third of the image width away from the right-hand edge.
* Turn off slit illumination.
* Move the rear of slit mirror out of the beam and take a test spectrum (e.g. 20 seconds) of the bright star (in the ''Exposure/CCD info'' pane, select ''Exposure type'' = SCIENCE from the drop-down menu, enter ''20'' in ''Exposure time'' and click ''Expose'').
* The resulting image will be displayed on Monitor 2. You are aiming for the spectrum to fall on approximately the central row of pixels. If the spectrum is too high or low, move the telescope slightly in RA, iterate until the star is well positioned.
* Once you are happy with the position of the spectrum on the image, on the TCS, add a red marker over the position of the star on the slit (TCS "''Pointer" '' pane: "''Markers"'', "''Add a red marker"'').
* Finally, move the guide mirror into the beam, and add a second red marker at the position of the star. This marker will be used to approximately position stars on the slit that are too faint to be seen reflected off the slit jaws.