• Topic ID: id_17423086
  • Version: 8.0
  • Date: Jan 23, 2022 10:53:31 PM

Planned Maintenance Schedule A

1 Schedule A Overview

Complete Schedule A one third of every year. This schedule includes a general cleaning and inspection of the CT system. 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 A.

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. If this is not the very first PM on this system, before beginning this PM Schedule, verify that the last PM Schedule completed was Schedule C.

  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 PM Report Form. (Use the temperature and humidity tool [Oregon Scientific BAR608HGA], or an equivalent tool.)

6.2 General Gantry Inspection

Perform the following tasks in the General Gantry Inspection.)

  • Test Display Lights and E-stop Buttons

  • Test Patient Tilt Sensors

note: Skip 1 Listen for Unusual Noises.

6.3 RCK-AVIMOS Inspection

As a monitoring system, the inspection is necessary to ensure accuracy and clarity of the AVIMOS. (For procedure, see RCK Planned Maintenance).

6.4 Phantom Inspection

Verify there is no crack or damage on QA phantom.

7 Gantry Power Off (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 (For procedures, see section 2.1 of Equipment Service - Lockout-Tagout-PPE ) and apply LOTO (for procedures, see 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 side, top, front, and rear gantry covers. (For procedures see, Replacement → Gantry → Enclosure → Cover Procedures.)

  6. Inspect the gantry cover cables and confirm that all cable keepers are in place. Check that cable keepers are securely attached to the cover.

7.4 Gantry Filter Cleaning

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

  • Clean DAS Detector Plenum Filter

  • Clean Gantry Heater Filter

  • Clean the top cover fans

  • Clean Detector Face Plate

  • Complete Rotating Path Components and Cables Inspection

7.5 HV Cable Candle Stick Inspection

Defaultly perform HV cable candle stick inspection in every PM A , 1 time a year ( it can be scheduled to PM B or C only if it did not be performed in PM A , make sure 1 time a year). 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.

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. Refer to Service methods-Replacement-High Voltage-HV Cable Replacement (5837775-1EN).

7.6 Replace The Tube Bellows

It is required to Replace The Tube Bellows ——46-309141P1( in FRU kit 5841554-20 ,or 5841554,or HV cable FRU kit ) before installing or re-installing a HV cable into the tube receptacle prior to turning the product over to the customer. Refer to section 3.1.3 Tube Bellow Replacementin Service methods-Replacement-High Voltage-HV Cable Replacement(5837775-1EN).

Generally it is not required to replace the Tank rubber gaskets unless the Tank rubber gasket is missing or damaged (if required, order 5841554 which contains rubber gaskets for Tanks, foam bellows for Tubes, and quad rings for both Tanks and Tubes) .

8 Gantry Power On (Covers Off)

8.1 General Tasks

  1. Remove LOTO (for procedures, see Equipment Service - Lockout-Tagout-PPE) and power up the system(For procedures, see Section 2.2 of Equipment Service - Lockout-Tagout-PPE).

  2. Start up the UPS, if present. (For procedures, see two Phase Partial UPS Installation Manual, located in Service Methods->Installation->Option.)

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

  4. Check that all five (5) 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.

  5. 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.

9 Gantry Power On (Covers On)

9.1 General Tasks

  1. Turn the 120 VAC, HV and Axial power OFF at the gantry service switch panel. (For procedures, see Safety-Equipment Service-Gantry)

  2. Reinstall front, rear, and top covers to the gantry. (For procedures see, Replacement → Gantry → Enclosure → Cover Procedures.)

  3. 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 1).

      Figure 1. 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.)

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

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

9.2 General Table Cleaning & Inspection

  1. Move the table to ISO elevation and the cradle to the maximum OUT position.

  2. Turn the power OFF (120 VAC, Axial Drive and HVDC) at the gantry service switch panel.

  3. Complete the General Table Cleaning and Inspection. (For procedures, see , General Table PM (GT2000/GT2000x/GT1700V) or General Table PM (Lite Table))

    note: Skip Hydraulic Fluid Leak inspection.

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

  5. If the 120 VAC power is still off, turn it back ON at the gantry service switch panel.

  6. Install the gantry side covers. (For procedures see, Replacement → Gantry → Enclosure → Cover Procedures.)

10 Finalization

10.1 System Scanning Test

Complete the System Scanning Test. (For procedures, see System Scanning Test.) While completing the test, do the following verifications (Step 1 and Step 2) and record them on the PM Report Form:

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

    • SCIM or 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.

10.2 Finishing Up

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

  2. Complete all required PM paperwork.