Author Topic: S970 sd ram issue  (Read 1242 times)

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Offline imzain786

S970 sd ram issue
« on: July 25, 2021, 04:35:48 PM »
Hello ,
Last night suddenly i am facing this unexpected error. In testing mode.
What can i do? How to hard reset or troubleshooting this error.

main Sd ram IC(205, 206, 201, 208 ) NG

I can't upload screenshot due to file size restrictions

Offline overover

Re: S970 sd ram issue
« Reply #1 on: July 25, 2021, 05:52:55 PM »
Hi imzain786,

if you don't have the S970 Service Manual, please download it here:

The only thing you can do yourself would be to start the internal Test Program and execute the following test routines (including a complete Factory Reset):

- Start the Test Program (using one of the two methods described on page 39 in the Service Manual.

- Execute test "002 : Memory Check1 All". (It's best to take a photo of each error message.)

- If the result is OK, execute "083 Test Exit" and check whether the S970 restarts normally now or not.
- If the result of test No. 002 is NG, execute the tests 003 - 009 (simplified ROM/RAM checks). Probably "005 : RAM Check1" will fail (NG).

- Execute the tests 067 - 073 (complete ROM/RAM checks). Probably "069 : RAM Check2" will fail (NG).

- Execute "081: Factory Set".

- Execute "083 : Test Exit". The S970 should restart now and "Force Format Mode" should be shown for a while.

If you're lucky, the S970 now works normally again. But if you get the error message "Main SD RAM ... NG" again, only Yamaha support will be able to help you. The mainboard would probably have to be replaced.

The ICs mentioned are all on the S970's mainboard (DMH circuit board). However, this spare part is not cheap: at the German company "" the DMH board of the S970 (Part No. ZN123700) costs around 415 euros ...

Hope this helps!

Best regards,
« Last Edit: July 25, 2021, 05:58:01 PM by overover »
They always said: "This is not possible!"  Then someone came and - just did it!

Never put the manual too far away.  There's more in it than you think!

Offline johan

Re: S970 sd ram issue
« Reply #2 on: July 25, 2021, 06:51:52 PM »
Indeed most probably a hardware problem. You could try to unplug your keyboard for a day or so to make sure all static electricity has gone from the RAM chips but few chances that this solves the problem.
SX700 and S670
Former keyboard: E433, E463

Offline imzain786

Re: S970 sd ram issue
« Reply #3 on: August 11, 2021, 09:55:22 AM »
Can i replace my s970 DMH board into s975 DMH board.
i mean to said, i have s970, can it fit or work fine S975 DHM board in my S970 body ???