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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.

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.
    - Testing MRU
      The MRU tester can be used to verify performance of the MRU/ERU during the yearly MRU test.
    - Testing MRU cable at magnet
    - Testing MRU finalization
  - 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.
- 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: 00000018WIA30AA6410GYZ
Topic ID: id_2004430 Version: 4.12
Date: Sep 23, 2021 2:55:40 PM

Doing an MRU yearly service check (MRU, ERU, or EDU PM testing matrix)

About this task

Note: (For MRU yearly service check) If you have the MRU Tester (5730424 ) available, follow the procedure below for the MRU Yearly Test. See Testing MRU.


MRU, ERU, or EDU PM testing matrix
Type	Model number	Service manual	Quarterly test	Yearly test	Remote MRU testing (if installed)	Battery replacement schedule
Type I	5196918 or 5196918-2	5265188	Complete quarterly service test	Complete yearly service test	Part of yearly service test procedure	3 year
Type II	46-294231G1	46-318393	Complete quarterly service test	Complete yearly service test	Complete appropriate quarterly and yearly test on the remote unit	3 year
Type III	46-252138G4 46-252138G3 46-252138G2	46-294439	Complete quarterly service test	Complete yearly service test	Not applicable	3 year
Type IV	2295525-8	5717641	Complete quarterly service test	Complete Sect 7 Periodic Testing	Part of yearly service test procedure	3 year

Note: (For all MRU procedures) The following steps must be completed if no label is found when doing a PM.

Procedure

Determine the date for the MRU battery. This date can be derived from the installation of the system, manufacturing date of the unit, or dispatch history.
Obtain the GE Equipment Maintenance or Inspection (5661793) sticker and complete all entries on the sticker including your name, employee ID, and today's date. Put the sticker on the MRU where it is easy to see.
For devices where the date is unknown or where there are concerns about the accuracy of the date, do the following when you replace the part:
1. Obtain the GE Equipment Maintenance or Inspection sticker and complete all entries on the sticker including your name, employee ID and use today's date.
2. Put the sticker on the MRU where it is visible.
  
  Figure 1. GE Equipment Maintenance or Inspection sticker