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 Forum index » DIY Hardware and Software
Roland SH 2000 - fault finding
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EddyS81



Joined: Jul 13, 2009
Posts: 23
Location: Wocrester,UK
PostPosted: Thu Jul 30, 2009 5:03 am    Post subject: Roland SH 2000 - fault finding
Subject description: Help with fault finding		 Reply with quote  Mark this post and the followings unread
Hello All,

A buddy of mine has just been given a faulty Roland sh 2000.

The fault is it will only play the last highest note played, fore example:

1st note C4 will play C4
2nd note E4 will play E4
3rd note D4 will play E4
4th note F4 will play F4
5th note E4 will play F4

So, can any one point as to where to start with it.
Or, where i can find fault finding details/ schematic,

Ta Ed
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urbanspaceman



Joined: Feb 26, 2008
Posts: 77
Location: italy
PostPosted: Thu Jul 30, 2009 7:23 am    Post subject: Reply with quote  Mark this post and the followings unread
check this

Roland SH-2000 Service Manual.zip
 Description:

Download (listen)
 Filename:  Roland SH-2000 Service Manual.zip
 Filesize:  3.71 MB
 Downloaded:  363 Time(s)
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EddyS81



Joined: Jul 13, 2009
Posts: 23
Location: Wocrester,UK
PostPosted: Thu Jul 30, 2009 8:01 am    Post subject: Reply with quote  Mark this post and the followings unread
Nice One!

Ta very much!
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Sebo



Joined: Apr 27, 2007
Posts: 564
Location: Argentina
PostPosted: Thu Jul 30, 2009 4:32 pm    Post subject: Reply with quote  Mark this post and the followings unread
Hi:
Do you realize that the synth is monophonic?
You can't play more than one note at the same time.
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EddyS81



Joined: Jul 13, 2009
Posts: 23
Location: Wocrester,UK
PostPosted: Fri Jul 31, 2009 2:16 am    Post subject: Reply with quote  Mark this post and the followings unread
Hi,


Quote:

Do you realize that the synth is monophonic?


Sorry if I was not clear on my first post, I will try to describe the issue again.. Smile
This is not an issue with polyphony. I am not trying to play chords.

If I play the note C4 only I hear C4
If I then play note D4 only I hear D4
If I then play note C4, again, only I hear D4 not C4.
If I wish to hear C4 again I must switch the synth off and on.

The synth will only play the last highest note sounded until. If a scale is played from low to high all is OK, if you try to play the same scale from high to low the highest note is sounded for each key pressed.

I hope this makes sense.

Ta Ed
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Sebo



Joined: Apr 27, 2007
Posts: 564
Location: Argentina
PostPosted: Fri Jul 31, 2009 4:54 am    Post subject: Reply with quote  Mark this post and the followings unread
Uh, OK, I understand now. Sorry for my last post.
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Dan Lavin



Joined: Nov 09, 2006
Posts: 649
Location: Spring Lake, Mi, USA
Audio files: 21
PostPosted: Fri Jul 31, 2009 11:06 am    Post subject: Reply with quote  Mark this post and the followings unread
It sounds like a keyboard sample and hold circuit problem. I think Roland calls sample and hold something else. I had an issue like this 20+ years ago on an analog mono synth. I think I replaced a zapped op amp in the s+h circuit to correct. Hope that helps.
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