• Topic ID: id_17423134
  • Version: 7.0
  • Date: Dec 29, 2020 1:06:05 AM

ORP Replacement (M40)

Prerequisites

Overview

This document provides the necessary steps to replace and configure the Onboard Rotation Processor Unit (ORP) for imaging.

1 ORP Assembly Removal

Procedure

  1. Move table to home position.
  2. Remove gantry right side cover.
  3. 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.
  4. Turn off [HVDC ENABLE] and [AXIAL DRIVE ENABLE] switches on Service Switch panel.
  5. Remove power to system. See Equipment Service - Lockout-Tagout-PPE from Safety section.
  6. Remove scan window, gantry left side cover, gantry top covers and gantry front cover.
  7. Rotate gantry such that ORP assembly is in 2 o'clock position.
  8. Turn off [120VAC ENABLE] switch on Service Switch panel.
  9. Engage rotational lock. See Equipment Service - Lockout-Tagout-PPE from Safety section.
  10. Disconnect four front cables and one rear cable from ORP Assembly.
  11. Loosen 4 captive screws to access ORP board.

    Figure 1. ORP Cover Removal

  12. Remove 4 screws and 4 studs, then remove ORP Assembly from gantry.

    Figure 2. ORP Assembly Removal

2 ORP Assembly Installation

Procedure

  1. Position ORP Assembly on to gantry and fasten with three M4 mounting screws.
  2. Tighten each M4 mounting screw with a 3mm hex bit socket torque wrench and 12 inch extension, to the following torque values.
  3. Install the bracket and connect four front cables and one rear cable to ORP Assembly.
  4. Route the cables by ty-wraps and metal loop, see Figure 3.

    Figure 3. Cable Routing

    note: For cable 5328105-2, fixed in the cover with metal loop (46-208718P5), by using M4 hex screw (1000-M4C010-04), lock washer (2203-M4-07) and flat washer (2000-M4-02), apply torque of 2.3Nm. See Figure 4.

    Figure 4. Fixed with metal Loop

  5. Disengage rotational lock. See Equipment Service - Lockout-Tagout-PPE from Safety section.
  6. Restore power to system. See Equipment Service - Lockout-Tagout-PPE from Safety section.
  7. From Console Unix Shell prompt, type touch /usr/g/fw/orpFtp and press ENTER.
  8. Turn on 120 VAC ENABLE, AXIAL DRIVE ENABLE, and HVDC ENABLE switches on Service Switch Panel.
  9. Press ESTOP RESET on Service Switch panel and wait until scan hardware is reset.

3 Setup, Checks, Alignments, and Calibrations

Procedure

  1. FLASH Download
  2. Gantry Rotation Safety Check
  3. Gantry Balance Procedure
  4. Turn off [HVDC ENABLE], [AXIAL DRIVE ENABLE] and [120 VAC ENABLE] switches on Service Switch panel.
  5. Install gantry front cover, gantry top covers, gantry left side cover and scan window.
  6. Turn on 120 VAC ENABLE, AXIAL DRIVE ENABLE, and HVDC ENABLE switches on Service Switch Panel.
  7. Press ESTOP RESET on Service Switch panel and wait until scan hardware is reset.
  8. Install gantry right side cover.