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Dbmiller8
Joined: 23 Jan 2022 Posts: 2
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Posted: Sun Jan 23, 2022 12:47 pm Post subject: Blocks of micro korg keys not working |
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I am new on here. I have an old micro korg that has a problem with keys C#3 thru E4. They don’t work. I was thinking the motherboard may be faulty because there are a bunch of other buttons that are not working(arpeggiator on/off, octave shift up/down, etc). But looking at the schematics, it looks like C#3-G#3 and A4-E4 on the daughter board are separate circuits on that board. So now I am thinking it is the daughter board. I tried cleaning the daughter board contacts(there was some corrosion on some of the pads) but the problem persists. In looking for a replacement motherboard, I am hopeful it is the daughterboard since mother boards seem impossible to find. Any help would be appreciated. Thanks in advance. |
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OpAmp Platinum Member
Joined: 07 Jun 2013 Posts: 1176 Location: Brussels, BE
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Posted: Mon Jan 24, 2022 8:11 pm Post subject: |
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Hi,
C#3-G#3 use all the BR02 and MK02 lines, while A4-E4 use all the BR03 and MK03 lines. That can be a clue.
You can maybe try to meausure pass through's on the daughter card with a multi meter.
Further, I'm not sure it is worthwhile to buy new daughter or motherboards for a micro. No idea how much you can save vs a new or working second hand one.
Have fun. _________________ microKORGXL, Kaossilator Pro, monotribe, SQ-1, volca fm, Kross 88 BK
Alesis SR18, Akai Miniak, Fender Strat, Line 6 Spider II 112, Zoom MS-50G |
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Dbmiller8
Joined: 23 Jan 2022 Posts: 2
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Posted: Mon Jan 24, 2022 10:25 pm Post subject: |
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Thanks OpAmp. A new motherboard is too expensive to justify not just buying a new micro for sure. I found a daughterboard for about $50 delivered. I am a hobbiest type of player so $50 is ok. $400+ is not. I have a new daughterboard en route. The weird ‘other issues’ leave me with some doubt that the new board will make it functional again but if not, I may just part the thing out. It is in pretty good shape for a 15 year old keyboard that my kids used to ‘play’ with. Thank you again for your suggestions. For my own knowledge, I will probably compare the passthrough on both boards. Knowledge is never a bad thing. Take care. |
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