Dual Channel Fiber Rx Replacement

Prerequisites

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Standard FE Tool Kit	1	-	-	-
4 and 5 mm Hex wrenches and driver bits	1	-	-	-
Lock-Out Tag-Out Kit	1	-	-	-
FE torque wrench set	1	-	5133203 or equivilent	-

Table 4. Safety

Electrocution hazard
High Voltage present.
Use proper lockout/tagout procedures before replacing components. 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.

Overview

This procedure defines the steps necessary to replace the dual channel fiber receiver replacement.

Remove the gantry right side cover.
Stop the rotor of X-ray tube in case of Liquid Bearing Tube before HVDC off. Refer to Liquid Bearing Tube Rotor stop procedure for details.
Turn OFF all 3 service switches (Axial Drive, HVDC, 120VAC) on the Service Switch Panel.
Shut down system software and completely shut down system power. Use LOTO to remove power from gantry.
Remove Gantry left side and top covers, and slide out the rear cover.

Refer to Replacement > Gantry > Enclosure > (Cover Removal Procedures).
Remove the top Slip Ring safety cover.

The receivers are located above the Slip Ring Brush Block. Remove the top slip ring cover to gain access to the receivers.
Remove the power and fiber cables from the receivers.

Figure 1. Slip Ring Receivers
Remove the two (2) M6 hex head screws (5 mm hex wrench).
Remove the receiver assembly and put the new assembly in place.

note:
Fiber cables are keyed and should be replaced in the same receiver as removed.
Install the two (2) M6 hex head screws (5 mm hex wrench), and two (2) cables but do not tighten screws.
Locate the Receiver gap tool and place it between slip ring antenna and receivers. The tool defines the necessary gap between receivers and slip ring.

Figure 2. Gap Tool Location
Tighten M6 mount screws and torque to:

Table 6. Mount Screws
7.9 N-m 5.8 lb-ft 70 lb-in 80 kg-cm
Remove alignment tool and put it back in storage location on gantry.
Loosen M5 adjustment screws (4 mm hex wrench) to allow adjustment of receivers to slip ring antenna. Reference Figure 1.
Align centerline of the receiver to centerline of antenna through small alignment hole for both top and bottom receivers as shown in Figure 3 and Figure 4.

Figure 3. Top Alignment Hole

Figure 4. Bottom Alignment Hole
Torque M5 Adjustment screws to:

Table 7. M5 Adjustment Screw Torque
4.6 N-m 3.4 lb-ft 41 lb-in 47 kg-cm

Remove the A1 Lock-Out Tag-Out and power up the console.
Turn on the Gantry 120 VAC service switch and slowly rotate the gantry by hand while watching the gap between the receivers and antenna. Make sure the antenna never touches the two receivers.
Turn off the gantry 120 VAC service switch and install the top slip ring cover.
Turn on the 120 VAC, HVDC and Axial drive service switches and enable Table drives.
Perform a System Scanning Test from the Functional Checks menu of the service manual to ensure proper data transmission.
Check the RTS Dip stats for the scan just run and make sure there are no errors shown. If errors are shown, recheck alignments and cable connections.
Turn off the Axial Drive, HVDC, and 120VAC service switches.
Install the gantry rear cover, top covers and left side cover.

Refer to Replacement > Gantry > Enclosure > (Cover Removal Procedures).
Turn on the 120VAC, HVDC and Axial drive service switches and enable Table drives.
Install the gantry right side cover.