Re: [AMMRL] find z0 problem on INOVA 400

From: Zhao, Chunqing via groups.io <czhao1=unc.edu_at_groups.io>
Date: Tue, 7 Oct 2025 18:21:04 +0000

Hi Bert:

Below are what I did as you advised. What should I do more for troubleshooting?

Thanks.

Nelson

It seems I could change the offset frequency when I moved the z0 slider.

I checked the shim cable. Both ends connected well

Shim power supply is on. How should I check fuses?

Below are the pictures front and back of Shim unit.


> From: main_at_ammrl.groups.io On Behalf Of Spin-Doc via groups.io
> Sent: Monday, October 6, 2025 8:26 PM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] find z0 problem on INOVA 400

Hi,

Try to move the z0 slider during Lock Scan and observe whether you can change
the offset frequency. If not, check:
- is the shim cable still properly connected on both ends
- is the shim power supply switched on, any blown fuses on the back
- which shim power supply do you have? Large blank aluminium front or painted
beige front? Might be the z0z1 board

Cheers
Bert

-> Sent via mobile <-

Spin-Doc
Magnetic resonance equipment, service, training & more
Dr. rer. nat. Bert Heise
Owner, applications scientist
Kiefernweg 13
58239 Schwerte
Germany
Web: http://www.spin-doc.net
Mail: bert.heise_at_spin-doc.net<mailto:bert.heise_at_spin-doc.net>
Phone: +49-171-5135315

Representing MestreLab, Stelar & Barthel HF


Am 07.10.2025 um 02:12 schrieb johnhahn cazent.com <johnhahn_at_cazent.com:

Hi All,


I would first ask whether you experienced a power outage? If so, or in any
event, open the lock screen gui and check to be sure the lock phase is adjusted
correctly. ..if the phase is off, it may not reliably find the Z0. Can you lock
it manually in the gui, or when you get the lock on resonance, and check the
lock box, it shifts out, you most likely have issues to be determined, given
no other circumstances.

Regards,
John E. Hahn

CAZ Enterprises, LLC
6320 Fly Rd. Ste 207
East Syracuse, NY 13057
Ph. 315-727-8192
http://www.Cazent.com



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Received on Tue Oct 07 2025 - 11:29:52 MST