New Life Games LLC

**Video Poker, Keno, Slots, 21** Gaming machines => SIGMA Video Games => Topic started by: Tom1969 on March 31, 2022, 10:31:11 AM

Title: Sigma RAMS Error
Post by: Tom1969 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

Title: Re: Sigma RAMS Error
Post by: Badbaud 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.

Title: Re: Sigma RAMS Error
Post by: Tom1969 on March 31, 2022, 09:52:16 PM

Thank you for the hint…

I will try it

Title: Re: Sigma RAMS Error
Post by: Tom1969 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

Title: Re: Sigma RAMS Error
Post by: Badbaud 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.

Title: Re: Sigma RAMS Error
Post by: Tom1969 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

Title: Re: Sigma RAMS Error
Post by: Badbaud on April 04, 2022, 05:00:25 AM

There should be schematics available for download in the NLG download section.

Title: Re: Sigma RAMS Error
Post by: Tom1969 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