Installation/Removal of Grating Cover

last modification: Sept. 7, 2007

Equipment needed

9/64 driver
bag of/for screws for the cover plate
latex gloves
headlamp

REMOVAL OF GRATING COVER

1. Remove exterior instrument cover for grating platform access from black electronics box side of instrument.
2. Put on the headlamp, or get a portable lamp and illuminate the grating so you can see what you're doing.
3. Assess which screws are in place on the grating cover. The cover's holes are not aligned with inserts and so not all of the screws can be in place. There are 5 screw locations possible; Two on the top, two on the bottom, and one on the outer side by the motor assembly.
4. Put on latex gloves, so you don't get fingerprints on the prism.
5. While a second person firmly holds the cover in place so it doesn’t slip, remove top screw closest to the prism.
6. If two screws are in place at the bottom, remove screw closest to the prism. If only one screw at the bottom, leave in place.
7. If second top screw is in place remove that screw.
8. Remove screw from side at motor location.
9. Remove final bottom screw, making sure cover doesn’t slip.
10. Carefully slide cover toward rear of instrument and away from grating, out through gap at final strut. BE CAREFUL NOT TO BUMP INTO THE PRISM OR ROTATE COVER INTO GRATING FACE. 11. Put screws in bag, and tape to cover for reinstallation.
12. Replace the instrument cover panel.

INSTALLATION OF GRATING COVER

1. Remove screws from bag and have ready.
2. Remove exterior instrument cover for access to grating platform from black CCD electronics box side of instrument.
3. Put on the latex gloves so you won't get fingerprints on the grating or prism.
4. Put on the headlamp, or find a portable lamp so you can see what you are doing. Have a small flashlight handy to aid in lining up screw holes.
5. Carefully slide grating cover in from rear of instrument, being careful not to bump into prism. Cut away goes down and toward the prism, to match the cut away on the grating.
6. While one person holds the grating cover steady against the grating baffle, have a second person carefully line up one of the screw holes, and loosely attach one screw.
7. Continue carefully wiggling the cover to line up additional screw holes, until a minimum of 4 screws are started loosely.
8. Using a cross pattern, tighten the screws down, until secure against the cover. Do not over torque the screws to deform the cover over baffle screws.
9. Replace the instrument cover panel.