Gradient Filter

Prerequisites

Procedure

  1. Remove SC Rear cover of magnet room side. Refer to SC Cover Removal
  2. Remove the terminal Cover for defective Gradient Filter by removing 2 screws from gradient filter.
  3. Check the voltage between Ground Stud and each terminal (+ or -). Verify that there is no voltage.
    4. Notice Image
    • notice
    • To prevent X-axis polarity swap, mechanical spacers are newly added to X-axis and new part number is assigned for G-Filter from 3Q, 2011. Keep the spacer on the cable end intact and maintain in the original location on cable when replacing G filter. Ensure the newly replaced gradient filter has the spacer pre-installed.
  4. Remove the cable from defective gradient filter while keeping the spacer on cable intact.
    note:

    Use two wrenches as illustration to tighten the nut. Need to tighten with enough torque to avoid spike noise. But, do not over tighten not to break stud.

  5. Cut tie-wraps at defective Gradient Filter.

    Figure 1. Remove the all cables

  6. Remove the 24 screws from frame of gradient filter.
  7. Remove gradient filter from Penetration Panel.

    Figure 2. Remove Gradient Filter

  8. Restore the Gradient Filter by tightening 24 screws.
    note:

    Make sure to tighten each screw.

  9. Connect Gradient Cables. Make sure screw is fixed, nut is tight, and cable is not detached from terminal.
    note:

    Use two wrenches to tighten the nut.

  10. Restore terminal Cover and restore Cabinet cover.