Background

DEIMOS gratings are retained in place using four pneumatically-operated clamps, numbered 1, 2, 4, and 5. Under special circumstances, it might be desirable to operate the indifidual clamps. A software procedure exists to do that, described here . If the software procedure is not adequate, or if the clamps need to be operated at the summit, a hand paddle exists that can be used to control the individual clamps.

Caveats

These steps carry risk of damaging either the grating clamps or the slider assembly, if the clamps are fired in the wrong order or in the wrong position.
These steps should only be performed by a WMKO Instrument Technician/Engineer or Support Astronomer.

This is an image of the hand paddle

To access the connection point for the handpaddle, the front panel that needs to be removed is the same that protects the air pressure gauges. With the panel removed, you will see a connector labeled "clamps control" and one labeled "clamps sensors". In this picture we are pointing at the "clamps control" connector.

Disconnect the control connector and replace it with the connector that comes from the hand paddle, as shown in the following two pictures.

With the paddle connected, you will be able to control the individual clamps and the hatch. Remember to restore the control connector when done with the manual operations.