Version 1.1
January 31, 2000

Note: items marked ** are highest priority to fix, since they impact observing

1.	Hatch occasionally failed to open or close in a timely manner at various times during all 3 engineering runs. Usually, rotating to a different instrument PA provided a work-around, but this still causes some lost observing time. The procedure for freeing a stuck hatch has been documented. In December 1999 we found a bad seal on the cylinder. The cylinder was replaced, and new, more robust cylinders placed on order. Twenty cycles of the hatch showed no problems. Air pressure is currently set to ~110 psi.	monitor
2.	Collimator actuator #1 exhibits somewhat higher backlash than the other two collimator actuators. This may bear some relationship to item #5, or it may be totally unrelated.	unresolved
3.	Multi-filter trays are extremely difficult to remove once inserted into any of the three wheels. Need to design and fabricate a fixture to allow easier removal.	pending
4.	CCD shutter often fails to open sufficiently fast following long periods of inactivity. Problem appears to clear once shutter is exercised once or twice.	monitor
**5.	CCD readout suffers from low-level fixed-pattern readout noise whenever the instrument is positioned (relative to gravity) so that collimator actuator #1 is carrying most of the weight of the collimator mirror and thus putting out relatively high levels of torque. Suspect inductive coupling between motor controller cable to actuator #1 and the high voltage cable to the ion pump. Need to re-route the HV cable to ion pump so that it is not in proximity to any motor control cables. This problem might also bear some relationship to item #2, or it may be totally unrelated.	deferred
6.	Spectral lines are tilted by 1.4 pixels along their length. Need to rotate CCD dewar by corresponding amount so that spectral lines will be aligned with the row/cols of CCD.	done
7.	Full complement of filter/mask trays has not been completely machined. Full complement of longslit masks has not been machined. Need better mask material?	pending
8.	Snout/baffle needs final alignment plus documentation of alignment procedure if imaging needed for future runs. Otherwise, this item will be resolved as soon as CARA baffles the tertiary tower, as they have agreed to do.	pending analysis         of Nov. data
9.	Double-check centering of wheel positions.	done
10.	Repoint calibration lamp projectors to get more light through the slit.	done
11.	Correct the gain setting for the air pressure sensor CARA added to the instrument. Currently it reads around -110 psi, which has the wrong sign and does not agree in magnitude with the dial gauges.	done
12.	Baffle the K2 tertiary tower.	Nov. tests indicate no gain in doing this
13.	Remake the low-D slits.	pending