• Topic ID: id_17479160
  • Version: 4.0
  • Date: May 23, 2022 11:27:05 PM

Planned Maintenance Schedule B

1 Schedule B Overview

Complete Schedule B one third of every year. This schedule includes a general cleaning and inspection of the Gantry, Console, and PDU. In addition, you will inspect any Options installed at the customer site. The tools, test equipment, and consumables listed here are needed to complete Schedule B.

Every site must maintain a site log. It can be a GE Site Log, or a notebook or binder that you create. A System Service History also is available through iCenter or ISD tools.

When reviewing the error logs, or during the course of the PM, if you find anything that you determine is critical to quality or to the operation of the system, then you should record it on the PM Report Form, and schedule additional time for specific corrective action.

You will need to open the PM Report e-form that corresponds to this PM Schedule. (The e-form is located on SIMS Content Viewer) Fill in the Report form as you complete the PM Schedule. Print one copy for your Site Log. You may need to print a second copy for the customer, if requested.

2 Personnel and Time Requirements

3 Tools and Test Equipment

4 Consumables

5 Preliminary Requirements

You may do any of the following remotely, if possible.

  1. Before beginning this PM Schedule, verify that the last PM Schedule completed was Schedule A.

  2. Determine if any PM tasks were completed earlier as part of a service action.

6 Initial Procedures

6.1 Check Temperature and Humidity

Check the Temperature and Humidity in the scan room; record these on the Report Form. (Use the temperature and humidity tool [Oregon Scientific BAR608HGA], or an equivalent tool.)

6.2 Gantry

  1. Remove the gantry right side cover. (For procedures see Replacement > Gantry > Enclosure > Cover Procedures > )

  2. Complete the General Gantry Inspection, including the following: (For procedures, see General Gantry Inspection).

    • Test Display Lights and E-stop Buttons

    • Test Patient Tilt Sensors

    note: Ignore inspection of the Listen for Unusual Noises.

  3. Complete a Laser Alignment Inspection. (For procedures, see Laser Alignment Inspection)

  4. Complete a Collimator Inspection. (For procedures, see Collimator Inspection)

6.3 Options

If your site has any of the following options, complete an inspection of each. (For procedures, see Options Inspection)

  • Ceiling Mounted Component Bolts

  • Nemoto Injector Inspection

  • Cardiac Option Inspection

  • RCK-AVIMOS Inspection

6.4 Phantom Inspection

Verify there is no crack or damage on QA phantom.

7 Power Off, Gantry Covers Off

7.1 General Tasks

  1. Move the table to lowest position.

  2. Move the gantry to zero degrees.

  3. Power down the system and apply LOTO (for procedures, see Safety-Equipment Service-Lockout-Tagout-PPE).

    note: If your system has an Emergency OFF switch on the wall, use it rather than the A1 Off switch to verify that the Emergency Off switch is working properly.

  4. If installed, confirm that the UPS power is disconnected when the Emergency Off device is pushed.

  5. Remove the gantry left side, top, front, rear, and back left base covers. (For procedures see, Replacement > Gantry > Enclosure > Cover Procedures > )

7.3 Gantry

  1. Inspect the Brush Block, Brushes, and Remove Slip Ring Brush Debris. (For procedures, see Inspect Brush Block and Brushes and Remove Slip Ring Debris)

  2. Complete an Axial Belt Tension Inspection.

  3. Complete the Gantry Filter Cleaning and Rotational Checks, including the following: (For procedures, see Gantry Filter Cleaning and Rotational Checks).

    • Clean the DAS Plenum Filter and Duct Cover

    • Clean the Gantry Heater Blower Filter

    • Clean the top cover fans

    • Complete Rotating Path Components and Cables Inspection

  4. Inspect the Hydraulic Tilt Pump for leaks:

    1. Inspect the gantry hydraulic tilt cylinder (left and right side), and fittings for leaks.

    2. Remove the gantry base cover.

    3. Inspect the gantry hydraulic tilt pump and reservoir for leaks.

  5. Inspect HV cable candle stick. Remove candle sticks which are connected to Tube, HV Tank, and HEMIT Tank, and perform visual inspection. If any cracks or damage is found, replace the HV cable.
    note: There is the possibility of a small crack, so it is necessary to inspect carefully.

    Figure 1. Small Crack

    It is also necessary to inspect the amount of receptacle oil. If the candle stick is dry while there is no leakage of oil through retaining ring, HV cable replacement is necessary.

7.4 NGPDU

Complete the NGPDU Inspection. (For procedures, see NGPDU Checks)

note: Ignore inspection of the verification of tap connection.

8 Power On, Gantry Covers Off

  1. Remove LOTO and power up the system (for procedures, see Safety-Equipment Service-Lockout-Tagout-PPE).

  2. Start up the UPS, if present. (For procedures, see 2-Phase UPS Installation.)

  3. Turn OFF the Axial and HVDC switches at the gantry service switch panel.

  4. Complete a Tube Heat Exchanger Inspection. (For procedures, see Clean Tube Heat Exchanger and Clean JEDI Inverter Fans)

  5. Check that all of the Plenum Fans are operating properly. Use a piece of paper to make sure the fans are pulling air INTO the plenum.

    note: A fan that is not running can still have the fan blades moving as air is pushed back out of the plenum though that fan port.

  6. Check/Grease the gantry main bearing.

    • Check the number of gantry revolutions since the gantry bearing was last greased.

    • If the number of revolutions is 2,000,000 or more, grease the gantry main bearing. (For procedures, see Grease Main Bearing)

    • If the number of revolutions is less than 2,000,000, indicate on the PM Report Form that grease is not required at this time.

  7. Check thermal control system function, see CFC (Common Fan Controller) Troubleshooting.

9 Power Off, Gantry Covers On

  1. Proceed to Hydraulic Tilt Motor Speed Adjustment procedure, record the tilt motor speed, and adjust the speed if required.

  2. Turn the 120 VAC power off at the gantry service switch panel. (For procedures, see Safety-Equipment Service-Gantry)

  3. Reinstall all covers to the gantry except side cover. (For procedures see, Replacement > Gantry > Enclosure > Cover Procedures.)

10 Power On, Gantry Covers On

  1. Install and inspect the Scan Window. (For installation procedures, see Replacement-Gantry Enclosure-Gantry Scan Window Removal and Re-Install)

    1. Inspect the scan window for physical damage.

    2. Check that the scan window is not raised higher than the front or rear cover at any location on the circle, and that the window is not wrinkled (see Figure 2).

      Figure 2. Scan Window

    3. Replace the scan window if it is damaged. (If you need to replace the scan window, follow the procedures in Replacement-Gantry Enclosure-Gantry Scan Window Removal and Re-Install to remove the old window and install a new one.)

  2. Turn the 120 VAC power on at the gantry service switch panel. (For procedures, see Safety-Equipment Service-Gantry)

  3. Rotate the gantry by hand and inspect rotational clearances.

  4. Turn on the Axial Enable and HVDC switches at the gantry service switch panel. (For procedures, see Safety-Equipment Service-Gantry)

  5. Install the gantry side covers. (For installation procedures, see Replacement > Gantry > Enclosure > Cover Procedures)

11 Finalization

  1. Complete the System Scanning Test (For procedures, see System Scanning Test). While completing the test, do the following verifications and record them on the PM Report Form:

    1. Verify that the following X-ray On indicators light up:

      • GSCB

      • Gantry Front

      • Gantry Rear (To avoid walking into the room during a scan, you may want to use a mirror to check this X-ray indicator.)

      • Room Warning Light

    2. Verify that the following scan control push-button are operational:

      • Start scan (and keypad lights).

      • Stop scan (and keypad lights).

      • Pause scan.

      • Advance to scan.

      • Stop table.

  2. Update the site logs. (For procedures, see Update Site Logs)

  3. Complete all required PM paperwork.