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Functional Checks
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Checking the gradient and system PDU power and ground connection
PDU power and ground connections need to be tight in order to avoid system failures.

Functional Checks
- System
  - Doing a compressor pressure check
    Do a check of the cryocooler compressor supply pressure.
  - Checking the RF screen room door
    Make sure the RF screen room door is functioning correctly.
  - B0 Drift Functional Check
  - Doing a check scan
    A check scan is done at the conclusion of many procedures. This functional check assures the unit is in good clinical working order.
  - Emergency Stop (E-Stop) planned maintenance
  - Emergency Off (E-Off) planned maintenance
  - fMRI QA Tool
  - HEC Hose Inspection, Coolant Fill, and Coolant Leak Check
  - Finalizing the HEC hose inspection, coolant fill, and coolant leak check
  - Identifying the Image Compute Node (ICN)
  - MDP power and ground and battery replacement label check
    MDP power and ground connections must be tight in order to avoid system failures.
  - Magnet Rundown Unit (MRU) Functional Check
  - Doing an MRU yearly service check (MRU, ERU, or EDU PM testing matrix)
    The model number is listed on the side of the MRU, ERU, or EDU. Refer to the appropriate vendor manual available from the online documentation library for applicable testing procedures.
  - Peripheral Pulse Probe Check
  - Spike Noise Check
  - System Level Correlated Noise Check
  - Checking the oxygen monitor
    References to various Oxygen Monitor Subsystem Manuals.
  - Checking and adjusting the patient intercom functionality
    GOC Audio Assembly (GOCAA) controls are adjusted at factory for best sound quality. This document describes how to check and confirm volume and quality of sound heard from speaker in the magnet bore and from speaker at the Scan Control and Intercom Module (SCIM). Directions for sound adjustments are also provided if needed.
  - Checking the gradient and system PDU power and ground connection
    PDU power and ground connections need to be tight in order to avoid system failures.
    - Applying LOTO - MDP
    - Tightening connections
    - Removing LOTO - MDP
    - Doing a check scan
      A check scan is done at the conclusion of many procedures. This functional check assures the unit is in good clinical working order.
- Radio Frequency (RF)
- Coils
- Magnet Enclosure
- Patient Table
- Patient/PAC
- Grounding and Leakage Current
- Spectroscopy

Discovery MR750 3.0T System Service Methods
5690009-2EN Revision 4
Object ID: 00000018WIA303A4510GYZ
Topic ID: id_2004633 Version: 4.1
Date: Jul 13, 2021 4:16:32 PM

Checking the gradient and system PDU power and ground connection

Prerequisites


Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	10 minutes	90 minutes	10 minutes


Item	Quantity	Part number	Manufacturer
Arc Flash PPE	1	-	-
Personal Lock	1	-	-
Red LOTO Personal Lock Wrap	1	-	-
Multi-locking Device (If multiple service people)	1	-	-
Red Warning LOTO Tag	1	-	-
Digital Voltmeter	1	-	-
Torque Wrench	1	-	-
Standard Socket Wrench Set	1	-	-

Safety

Before working in any GE Healthcare MR suite or performing any GE Healthcare service procedure, you must:

Have read and understood all hazard conditions and safety requirements in the latest revision of the GE Healthcare MR Service Safety Manual (5452735).
Have successfully completed all relevant GE Healthcare Environmental Health and Safety (EHS) courses (or for non-GE employees, equivalent workplace training courses).
Comply with all site-specific training and workplace safety requirements.

If you have any safety concerns at any time, do not begin work or immediately stop work and move to a safe location. Immediately contact your supervisor or site safety officer for instructions on how to proceed.

DANGER

Electrocution Hazard!

LETHAL VOLTAGES ARE PRESENT WITHIN THE PDU, EVEN WHEN ALL PDU BREAKERS ARE OFF.

CHECK THAT POWER AT THE MAIN DISCONNECT IS OFF, LOCKED, AND TAGGED BEFORE PROCEEDING. Always obey the following procedures when you are near high voltage:

Arc Flash Safety
LOTO for the PGR PDU/Gradient Subsystem