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Old 25th January 2011, 10:24 AM   #1
Bregg is offline Bregg  Poland
diyAudio Member
 
Join Date: May 2009
Default remains of Yamaha PSR 620 / 520

Hi !

I have damaged Yamaha PSR 620 keyboard with damaged mainboard . A 5V low drop stabiliser shortcut sent about 14 V from an input , to all 5V powered mainboard section
I suppose many damaged parts , including processor etc. I was able to obtain another similar mainboard , but it is dead as first one . On the 5V stabiliser output is about 4 V and CPU is warming up quickly . I hope there is a dynamic
keyboard controller ( yamaha XJ450ao ) still intact . It has 6 pin connection with motherboard , two of them is power , of course . Is there a chance to use this controller to build up a midi keyboard ? Or maybe I should use another IC to control this dynamic keys for simple midi controller ?
Any help warmly welcome with these old mainboards , or in building a midi controller with use what's left from yamaha psr .
I'm looking for any schematics for this keyboard too .

Regards & thanx !

Maciej
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Old 30th January 2011, 11:56 AM   #2
DrSound is offline DrSound  Israel
diyAudio Member
 
Join Date: Aug 2005
Quote:
Originally Posted by Bregg View Post
Hi !

I have damaged Yamaha PSR 620 keyboard with damaged mainboard . A 5V low drop stabiliser shortcut sent about 14 V from an input , to all 5V powered mainboard section
I suppose many damaged parts , including processor etc. I was able to obtain another similar mainboard , but it is dead as first one . On the 5V stabiliser output is about 4 V and CPU is warming up quickly . I hope there is a dynamic
keyboard controller ( yamaha XJ450ao ) still intact . It has 6 pin connection with motherboard , two of them is power , of course . Is there a chance to use this controller to build up a midi keyboard ? Or maybe I should use another IC to control this dynamic keys for simple midi controller ?
Any help warmly welcome with these old mainboards , or in building a midi controller with use what's left from yamaha psr .
I'm looking for any schematics for this keyboard too .

Regards & thanx !

Maciej

I have these shematics and service manual, but files are too large.
Unfortunately only small files can be uploaded at this forum.

Send me your e-mail.
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Old 14th December 2011, 07:46 PM   #3
diyAudio Member
 
Join Date: Dec 2011
Hi,

I know the thread is pretty old, but...

The very same situation here, with an old PSR-520. How did your story end, Bregg? Anyone else was able to turn that into a working midi controller? Is it even worth doing?

Thanks!
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