[Dsg-hallc_gem] Hall c gem gas flow monitoring

[Ching Him Leung]

Hi Marc,

I have tried that, but with no success… We will likely make an escorted access on Monday morning. Otherwise, we can wait till the maintenance day on Wednesday.

Ching Him

From: Marc Mcmullen <mcmullen at jlab.org>
Date: Friday, May 9, 2025 at 4:25 PM
To: Ching Him Leung <cleung at jlab.org>, Brian Eng <beng at jlab.org>, Dsg-hallc_gem at jlab.org <dsg-hallc_gem at jlab.org>
Subject: Re: [Dsg-hallc_gem] Hall c gem gas flow monitoring
Hi Ching,

Next I would shutdown the Pi and carefully remove and reinstall the SD card and try to boot up.

If it doesn’t work, then you will need a new SD card imaged with the needed software.

We have the image on the Jlab drive, I will have to make you a new SD.

I can bring it next week and we can look at it during a day shift scheduled access.

Marc



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________________________________
From: Ching Him Leung <cleung at jlab.org>
Sent: Friday, May 9, 2025 4:07:48 PM
To: Brian Eng <beng at jlab.org>; Marc Mcmullen <mcmullen at jlab.org>; Dsg-hallc_gem at jlab.org <dsg-hallc_gem at jlab.org>
Subject: Re: [Dsg-hallc_gem] Hall c gem gas flow monitoring

Hi Brian

Thank you. Yes, it is definitely HDMI port 0, that we are using.

Ching Him
________________________________
From: Brian Eng <beng at jlab.org>
Sent: Friday, May 9, 2025 4:04 PM
To: Ching Him Leung <cleung at jlab.org>; Marc Mcmullen <mcmullen at jlab.org>; Dsg-hallc_gem at jlab.org <dsg-hallc_gem at jlab.org>
Subject: Re: [Dsg-hallc_gem] Hall c gem gas flow monitoring

One other thing to make sure is that you’re plugged into HDMI port 0 rather than 1.

________________________________
From: Brian Eng <beng at jlab.org>
Sent: Friday, May 9, 2025 4:01:46 PM
To: Ching Him Leung <cleung at jlab.org>; Marc Mcmullen <mcmullen at jlab.org>; Dsg-hallc_gem at jlab.org <dsg-hallc_gem at jlab.org>
Subject: Re: [Dsg-hallc_gem] Hall c gem gas flow monitoring

Hi Ching,

That is the GPU test screen for a raspberry pi, usually if it gets stuck there it is because the SD has failed.

________________________________
From: Dsg-hallc_gem <dsg-hallc_gem-bounces at jlab.org> on behalf of Ching Him Leung <cleung at jlab.org>
Sent: Friday, May 9, 2025 3:53:29 PM
To: Marc Mcmullen <mcmullen at jlab.org>; Dsg-hallc_gem at jlab.org <dsg-hallc_gem at jlab.org>
Subject: Re: [Dsg-hallc_gem] Hall c gem gas flow monitoring

Hi Marc

So I powered it on without the network cable. And this is what being shown on the display.

I am not sure if this a good sign or not

Ching Him

[image/jpeg]
________________________________
From: Marc Mcmullen <mcmullen at jlab.org>
Sent: Friday, May 9, 2025 1:30 PM
To: Ching Him Leung <cleung at jlab.org>; Dsg-hallc_gem at jlab.org <dsg-hallc_gem at jlab.org>
Subject: Re: Hall c gem gas flow monitoring

I would unplug it for a minute or two, disconnect the network cable. Power it back on with the display connected and see if it powers up and displays a normal Rpi screen (all without the network plugged in).

If that works, then plug in the network cable.
________________________________
From: Ching Him Leung <cleung at jlab.org>
Sent: Friday, May 9, 2025 12:49 PM
To: Marc Mcmullen <mcmullen at jlab.org>; Dsg-hallc_gem at jlab.org <dsg-hallc_gem at jlab.org>
Subject: Hall c gem gas flow monitoring

Hi Marc

We think there might be some issue with the rpi for GEM gas flow monitoring in hall c. We tried power cycling it, but it did not respond.  We hook up a display to the rpi, but nothing shows up on the screen.

Do you have some suggestions?

Thank you
Ching Him
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