• Topic ID: id_18717889
  • Version: 2.0
  • Date: Sep 26, 2020 10:13:43 PM

DAS Filter Replacement

Prerequisites

Overview

This procedure describes the replacement of the Gantry DAS Filter.

The DAS filters have a foam fitted filter on one side of the frame. Once the foam filter deteriorates, FEs can order a new foam filer as following in Table 5

1 Board Removal

Procedure

    Notice Image
    • notice
    • Follow ALL Electro-Static Discharge procedures. Always use ESD Wrist Strap and grounding cords. The use of a ground Monitor is suggested
  1. Position the table to its lowest position.
  2. Remove the gantry right side cover.
    3. Notice Image
    • notice
    • Always turn OFF the HVDC before the 120VAC. Turning OFF 120VAC power before HVDC power can result in equipment damage.
  3. Turn OFF Axial Enable, HVDC, and 120VAC switches on the Service Switch panel.
  4. Remove the gantry top and front covers. refer to Gantry Front Cover Removal and Re-Install
  5. Position the DAS at the 9 o'clock position.
  6. Lock the gantry in position using the rotational lock.
  7. Put on wrist strap and use ESD precautions.
  8. Loosen the thumbscrew that holds the filter/frame assy, and remove the filter/frame assy from the DAS plenum.

    Figure 1. Thumbscrews

    Figure 2. Filter/Frame Assy Removal

2 DAS Filter Installation

Procedure

    • notice
    • Follow ALL Electro-Static Discharge procedures. Always use ESD Wrist Strap and grounding cords. The use of a ground Monitor is suggested
  1. Remove the dirty and broken filter from the aluminum frame, then install the new one.

    Figure 3. Filter Removal

    Figure 4. New Filter Installation

  2. Re-insert the filter/frame assy into the DAS plenum, and secure it with thumbscrew.
  3. Turn on the Axial and HVDC switches, on the Service Switch Board.
  4. Disengage rotational lock.
  5. Re-Install the Gantry Cover

3 Finalization

No finalization steps.