Home
Functional Checks
System
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 cable at magnet

Functional Checks
- 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

Optima MR450w BASE 1.5T System Service Methods
5690012-2EN Revision 3
Object ID: 00000018WIA30CA6410GYZ
Topic ID: id_2004432 Version: 4.1
Date: Jun 16, 2020 10:58:16 PM

Testing MRU cable at magnet

Procedure

Note: This process is only needed for troubleshooting, it is not needed for PM.
Disconnect the 5-pin Switchcraft connector P3 cable going into magnet.
Connect this cable to J3 of the MRU tester.

Figure 1. MRU tester connected at magnet
1 Remove cable from J3
2 Install cable into J3 of tester
Plug DVM onto jacks of MRU tester to check for proper voltage.
Important: Failure to properly configure the MRU tester could result in a magnet quench.
With cable to magnet disconnected and MRU tester plugged into MRU, press the red Quench button. Record output voltage for both A and B circuits.
Both LEDs on the MRU tester should light, which indicates:
- Proper operation of the MRU
- Proper operation of the cable between magnet and the MRU
Note: There should be a 2.4 volt drop when measuring voltage at the magnet compared to measuring voltage at the MRU.
When complete, press Reset on the MRU. See applicable vendor manual for specific MRU to locate the Reset button.
Important: Do not connect cable P3 into the magnet if the LEDs on the MRU tester are illuminated, this will cause a magnet quench.
Reconnect cable at magnet.
Proceed to Finalization.

Home
Functional Checks
System
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 cable at magnet