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 Forum index » DIY Hardware and Software
Understanding block diagram
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Kosmo Mishka



Joined: Apr 18, 2013
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Location: Moscow

PostPosted: Fri Oct 25, 2013 4:15 pm    Post subject:  Understanding block diagram
Subject description: korg ex 800
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Hello electro-musicians. I tried to install hawk 800 mod, and have an issues. When I installed hawk 800, it wont power on. I put original IC29 and IC22. And it works but with some missed features (no midi, no waveforms selection, noise on low octaves DCO). Michael Hawkins said it can be a problem in IC29 connection. Actually I did not touch anything but IC22 and IC29. I checked it visually and with multimeter, but no luck. Now I want to try it with schematic.
I am trying to check all connections, but have a problem reading block diagram, as only I have (can not find PCB layout).
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Is this dot (in red) connection between 7-15 IC29 ouputs? If yes, I just can`t find it on board. What is YO-7 and AO-7?

Sorry for being very newbie, but I am trying to make it works near 2 weeks.
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Blue Hell
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PostPosted: Fri Oct 25, 2013 4:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

No, it is not a dot, it is a crossing of two busses A0-7 and Y0-7 .. it would make no sense to connect those, it is just a 'bad copy dot'.
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Blue Hell
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PostPosted: Fri Oct 25, 2013 4:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

And with bus I meant that one line stands for several wires, 8 in this case.
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Blue Hell
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PostPosted: Fri Oct 25, 2013 4:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

Such that Y0 .. Y7 are not actually connected to each other either.

Anyway, hope that this cleared it up, otherwise ask!

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Kosmo Mishka



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PostPosted: Fri Oct 25, 2013 4:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks. It totally make sense. How to understand which wire on the bus connects what? As I understand something connects with the thing that I marked, but what pin connects with it?
UPD.:Oh, or it doesnt connect as it different buses

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Blue Hell
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PostPosted: Fri Oct 25, 2013 5:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

That one is Y0 from the Y0-7 bus - so it comes from IC 29 pin 15
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Kosmo Mishka



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PostPosted: Fri Oct 25, 2013 5:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oh, I see. Many thanks!
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Blue Hell
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PostPosted: Fri Oct 25, 2013 5:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Glad you got it :-)
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