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Author Topic: Sigma RAMS Error  (Read 1785 times)

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Offline Tom1969

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Sigma RAMS Error
« on: March 31, 2022, 10:31:11 AM »
Hi

I’m a Sigma NEWBIE…

It is a SIGMA W42…

Got RAM Error .Changed Gold Cap.Turning Reset could not solve the Problem… Have no schematics from the MPU.
Is there a RAM Clear Chip for Sigma available ? If yes where can I get it and what is the procedure or I have to change the RAM’s ?

Would be great if someone could share the schematics or can mark the RAM’s in my picture

Any Help highly appreciated …

Tom

Offline Badbaud

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Re: Sigma RAMS Error
« Reply #1 on: March 31, 2022, 12:50:10 PM »
Usually it is not actually the RAM chip that is bad.
There was no clear chip made for Sigmas. 
Remove the RAM chip, if it is in a socket, and short it's legs on some bare metal for a couple of minutes.
Let them that don't want any, have memories of not getting any.

Offline Tom1969

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Re: Sigma RAMS Error
« Reply #2 on: March 31, 2022, 09:52:16 PM »
Thank you for the hint…

I will try it

Offline Tom1969

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Re: Sigma RAMS Error
« Reply #3 on: April 03, 2022, 09:32:48 PM »
Hi,

pulled the RAM and try to clear as advices..but no success…

There is another RAM on the board..Do I have to clear that one also ?

In parallel I ordered some fresh RAMs

Any further Recommendations would be appreciated

Tom

Offline Badbaud

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Re: Sigma RAMS Error
« Reply #4 on: April 03, 2022, 09:53:18 PM »
Only one of the RAMs will have DC voltage applied to it, via the charged SuperCap,  when the board is turned off.
That is the one to concentrate on.
Let them that don't want any, have memories of not getting any.

Offline Tom1969

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Re: Sigma RAMS Error
« Reply #5 on: April 03, 2022, 10:09:16 PM »
Thank you

That is the one I have marked wright ?

Do you have schematics from the MPU ? If yes it would be great if you can share it…

Thanks
Tom

Offline Badbaud

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Re: Sigma RAMS Error
« Reply #6 on: April 04, 2022, 05:00:25 AM »
There should be schematics available for download in the NLG download section.
Let them that don't want any, have memories of not getting any.

Offline Tom1969

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Re: Sigma RAMS Error
« Reply #7 on: April 16, 2022, 05:26:49 AM »
Could not find schematics from the MPU on the download area…

Changed RAM to a new one..

Now the board is not even starting up any more..

Any further recommendations…?

Any Help would be great…

Tom


 

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