• Topic ID: id_17422969
  • Version: 6.0
  • Date: May 22, 2020 4:06:06 AM

General Table PM (Lite Table)

Prerequisites

 Procedure Effectivity:

1 Check Head Holder

Procedure

  1. Check each head holder on site for the following:
    1. The latch hook stops at each of the lock and release positions.
    2. The hook axis has not become weak.
    3. No cracks exist on the acrylic resin parts; especially inspect well the rib root (where the patient’s neck is placed), and parts around the flat head screws. If any crack is found, replace the head holder.
    4. No flat head screws are loose. If loosened, tighten those. (Torque: 8 kg–cm; turn the grip of the screwdriver using thumb, index finger, and middle finger, which gives approximately this torque.) Tighten the loosened screws only, and DO NOT excessively tighten the screws, which will cause cracks.
    5. All velcro tape is securely attached to the head holders. If not the case, replace the velcro tape.
    6. Check that the lock hook is securely attached to each head holder. If not, tighten the loosened flat head screw. Do not over tighten screws.
    7. Repeat the same check for the cradle side lock hook.

2 Check Table Cover

Procedure

  1. Check that the Table Cover is not deformed and not damaged. Also check that the Table Cover does not interfere with the cradle.

3 Check Gap Sponge

Procedure

  1. Check that two pieces of sponge are securely attached to the Table front end. If they have come off, replace them.
  2. Check the gap between cradle and sponge is 7mm or less.

    Figure 1. Gap between Cradle and Sponge

4 Gap between Table Cover and Cradle

Procedure

  1. Check that the position of the table cover and the cradle are parallel, and the gap between them is 7mm or less.

5 Check Cradle Attachment Rail

The purpose of this section is to check the length of the rail groove to ensure that is less than 2.9mm along the entire length. To make this measurement, a 2.5mm hexagon wrench (Allen wrench) can be used.

Procedure

  1. Verify that the width between the both ends of the rail’s groove is 2.9mm or less.
    note:
    To measure the groove, use the 2.5mm hexagon wrench, when the wrench is measured from flat to flat, it measures 2.5mm. This measurement will be conducted using the wrench from flat to flat. If the wrench fits on the flat, it passes, if it can be rotated, it fails.

    Figure 2. 2.5mm Hexagon Wrench

    1. Place the 2.5mm hexagon wrench into the groove, using the flat sides of the wrench and slide the wrench along the length of the groove. If it does not fit, the rail is good.
    2. If the wrench can be rotated while in the groove, the test fails and the rail should be replaced.

    If the width of the rail’s groove is out of tolerance, order the following part and replace the defect attachment rail with new one.

    Figure 3. Inspection of Cradle Attachment Rails

6 Holder Stability Check

Procedure

  1. Verify that the following holders is not loose by hand, when they are attached to the cradle edge.

    • Axial Head Holder

    • Cradle Extender

    • Head Holder

    • Phantom Holder

    • Coronal Holder

    • None

7 Check Touch Sensor Operation

Procedure

  1. Press the Touch Sensor without Table movement operations, and then verify that the Table will not move DOWN when Table DOWN SW is pressed.
  2. Repeat this for all touch sensors.
    note: To resume the Table down motion, first move the Table slightly UP, then perform the Table DOWN operation.

8 Clean Cradle tray / Table Cover

Procedure

    Notice Image
    • caution
    • Use proper procedures to avoid blood–borne pathogens. The maintenance tasks which follow include procedures concerned with the cleaning of equipment (Table Tray, Gantry Cover, etc.). Refer to local / company guidelines for those procedures, especially where body fluids or other possible contaminates are present.
  1. Clean Table covers and cradle.

    1. Clean dust from the Table top cover (tray) using a vacuum cleaner.

    2. Clean the Table covers.

    3. Be sure to wipe off contrast from the cradle edge extrusion.

9 Check for Oil Leak

Procedure

  1. Verify that no oil has leaked from the cylinder, pump, hoses, etc. Verify that the Table does not lower on its own when the Table is left unoperated for some time.

10 Grease-Up

Procedure

  1. Remove the both sides Table covers and bottom Table covers.
  2. Apply grease (SHELL ALVANIA grease #2 or equivalent) to the following portion. (Pack grease between the inner and outer races of the ball bearing using your finger.)

    • Joint Bearings (total eight (8) bearings) of the Table Linkage

    • Piston Rod Surface of the Hydraulic Cylinder

    • Frame Rail and of Cradle Assy

  3. Wipe off any excess grease.

    Figure 4. Joint Bearings & Piston Rod

11 Table Anchor Inspection

Procedure

  1. Check to see if any of the anchor washers can be moved by hand.

    • If moveable, re-torque to 50 ± 6 Nm (37 ± 5 ft. lbs.).

    • If re-torqued, add a new visual inspection mark with a permanent marker (or tamper-prof paint) by drawing a line across the nut, shaft and washer.

12 Functional Check

Procedure

  1. Record the distance from ISO center ”V” by selecting “view values” on Mechanical Characterization in Characterization menu of CSD.
  2. Tilt the gantry to zero degrees if it is not already there.
  3. Move he cradle to the home position.
  4. Use the Table Down gantry push-button to lower the table to the minimum height.

    Expected Result: The elevation display should red 550+V ± 3 mm.

  5. Raise the table to the maximum height using the gantry controls.

    Expected Result: Elevation display should read V ± 3 mm.

    note: If the mechanical alignment of the table/gantry is not correct, these values may be out of range. Most of the following tests will still be valid.
  6. Move the cradle height to 154 mm.
  7. Move the cradle in to 1000 mm.
  8. Tilt the gantry to S30 and verify the table height can be adjusted from 154 mm to V mm.
  9. Move the cradle height to 72 mm, and tilt the gantry I30.

    Expelcted Result: The tilt display should read I30. The table lower limit should be 72 ± 3 mm. The upper table limit should be V ± 3 mm.

  10. Use the home switch to return the gantry and table to the home position.

13 Finalization

No finalization steps.