GDAS-4/8 Elastomers Replacement

Prerequisites

Table 5. Safety

Ensure that you are properly grounded by using the appropriate ESD wrist strap and cord connected to a good ground point in the Gantry.

Overview

Always turn OFF the HVDC before the 120VAC. Turning OFF 120VAC power before HVDC power can result in equipment damage.

Turn OFF Axial Enable, HVDC, and 120VAC switches on the Service Switch panel.
Remove the gantry top and front covers.
Remove the DAS air plenum DAS Air Plenum Removal and Installation.
Put on wrist strap and use good ESD precautions. Wear Finger Cots, and follow good Detector Handling practices.
Remove appropriate Flex housing outer cover by removing the housing Cover clamps.
- A-side flexes must be removed to gain access to B-side flexes. To increase access space to the B-side, carefully bend the detached A-Side flex straight out towards the front of the gantry, so that it is perpendicular to the Detector window.
- Each cover holds four (4) flex cables in place.
- There are 2 clamps per cover. Each clamp is held by a 3mm captive hex cap screw. Use a 2.5mm Hex screwdriver bit to remove each clamp and cover.
- Keep A-side and B-Side covers separate, as they are not interchangeable.

Elastomers may become dislodged. Elastomers can potentially FALL OUT of housings, while flexes are being removed. Exercise caution.

Place an anti-static Detector Flex Boot on each exposed flex.
Carefully remove the questionable elastomer from its seating.
Insert the new elastomer so that the gold contact lines face outward.

Figure 1. “A-Side” Elastomer Installation
Remove anti-static boots from flexes, and ensure that flex ends are clean. Clean with approved Alcohol pads, where required.
Replace flex covers (B-Side first), and torque clamps to 13 in-lb (1.47 N-m).
When complete, replace DAS air plenum.
Remove rotational lock, restore power, and reassemble gantry covers.

No finalization steps.