Background

Certain faults may require a reset of AC power to DEIMOS. There are two circuits (orange and blue) and thus two reset boxes. Access to these boxes is possible through electronics bay 3.

Procedure

  1. Rotate DEIMOS to access electronics bay 3. The electronics bays are located around the large ring-like structure at the back of the instrument. They are labeled with numbers and contents. There are three ways to set the instrument rotator position: These put the bay on the left and right hand sides of the instrument, respectively, when viewed from the rear of the instrument looking toward the telescope.
  2. Safety first: before removing a cover, put the band brake on! See figure 1.
  3. Grab a 5/32 T-handle Allen wrench from the Nasmyth deck desk on your way to the instrument.
  4. Remove the access panel shown in Figure 2.
  5. Figure 3 shows the AC reset switches. Press the appropriate one to reset the given circuit.
  6. Re-install the cover. Putting the cover back on is straightforward other than taking care not to drop the bolts.
  7. Don't forget when leaving: band brake off, hand paddle in computer.

Figure 1. DEIMOS band brake

Image showing DEIMOS band brake

Band brake. Push lever down to engage. Pull up to release.

Figure 2. Access Panel

Image showing
	  qaccess panel to AC power switches

Panel to remove to get to AC power resets.

Figure 3. Reset switches

Image showing
	  AC power reset switches

Electronics bay 3 showing AC resets.