Fuse Box Assy Replacement

Prerequisites

Table 5. Safety

Electrocution hazard
High Voltages present.
Use proper lockout/tagout procedures before replacing components. See safety menu of Service Document gui for appropriate procedures.

CRUSH HAZARD.
UNEXPECTED GANTRY ROTATION CAN CAUSE SERIOUS INJURY.
Use the gantry rotation lock to lock out gantry rotation. See safety menu of Service Document gui for appropriate procedures.

Follow ALL required safety and PPE procedures customary for your organization when working on this product.

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 left side and top covers.
Position the DAS at the 11 o'clock position.
Cut tie-wraps holding cables to the DHCB (Detector Heater Control Board) cover.

Figure 1. Cut Tie-wrap
Disconnect all cable connectors from the DHCB (J1, J2 and J3). (See Figure 1)
Remove the DHCB Assy from the fuse box by unscrewing its four screws.

Figure 2. DHCB Removal
Remove the fuse box with cables from the DAS mounting plate by unscrewing its five M5 screws.

Figure 3. Fuse Box Removal
Only slightly disengage the fuse box from the DAS mounting plate because of cables interference, then lift to show up the fuse box rear cover, cut any necessary tie-wraps.
Remove the rear cover from the fuse box by unscrewing its three screws.

Figure 4. Remove Fuse Box Rear Cover
Disconnect all associated terminals and cables.

Figure 5. Inside View of Fuse Box

Get the new fuse box and reconnect terminals/cables.
Reinstall the rear cover by screwing its three M3 screws. (Torque: 1.04N-m + Loctite 243).
Remount the fuse box to DAS mounting plate. (Torque: 4.6N.m)
Reinstall the DHCB Assy.
Reconnect all cable connectors to the DHCB (J1, J2 and J3) and retie cables with tie-wraps.
Turn on Axial Enable, HVDC, and 120VAC switches.
Restore the gantry to original configuration.

No finalization steps.