Search found 24 matches

by mikepctvman
Mon Mar 11, 2019 10:43 pm
Forum: HELP!
Topic: Korg M1 buttons not working
Replies: 37
Views: 11967

Re: Korg M1 buttons not working

I have a new multiplexer on the way. Would I still see continuity and my meeter jump when i press the buttons regardless if the multiplexer was good or not?
by mikepctvman
Mon Mar 11, 2019 12:27 am
Forum: HELP!
Topic: Korg M1 buttons not working
Replies: 37
Views: 11967

Re: Korg M1 buttons not working

Update: I think I am leaning toward a faulty chip like everyone here, I tested voltage/continuity across each chip pin and at the connector while pressing the unresponsive buttons and I watched the voltage jump on the tester as the buttons were pushed, so its getting a connection from the buttons th...
by mikepctvman
Sun Mar 10, 2019 7:36 pm
Forum: HELP!
Topic: Korg M1 buttons not working
Replies: 37
Views: 11967

Re: Korg M1 buttons not working

Yes i do notice a possible scratch in that area I didn't realize at first. How would I even go about repairing that? Im going to check back on that, Hope the board isnt damaged beyond repair. Like i mentioned i bought this used, it's in overall great shape but you never know what people mangle up on...
by mikepctvman
Sun Mar 10, 2019 2:07 am
Forum: HELP!
Topic: Korg M1 buttons not working
Replies: 37
Views: 11967

Re: Korg M1 buttons not working

Thank you so much for the detailed info Rasputin. I have a clear idea of what to do next. I will let you know how it goes. Just for reference, in this photo is what the back of the button board looks like in an M1, I outlined the six buttons that aren't working on mine, you can see they are indeed t...
by mikepctvman
Sat Mar 09, 2019 6:31 pm
Forum: HELP!
Topic: Korg M1 buttons not working
Replies: 37
Views: 11967

Re: Korg M1 buttons not working

ok, I understand what you are saying for the most part. sorry for all the silly questions but as for checking the multiplexer, what would I set my multimeter to and which pins would I contact to check if I am getting the 0, 5, 2.5 and 3v readings?
by mikepctvman
Sat Mar 09, 2019 4:00 pm
Forum: HELP!
Topic: Korg M1 buttons not working
Replies: 37
Views: 11967

Re: Korg M1 buttons not working

Here are the chips in my synth, do the letters before the numbers on the tops of the chip matter?:
Image
by mikepctvman
Sat Mar 09, 2019 1:46 am
Forum: HELP!
Topic: Korg M1 buttons not working
Replies: 37
Views: 11967

Re: Korg M1 buttons not working

Update: so I disconnected the wire connector, cleaned, checked all pins for continuity & all passed the checks, might very well be the multiplexer as the culprit now. Can I find just any generic multiplexer off eBay long as the numbers match up? some have different letters before the numbers, Should...
by mikepctvman
Fri Mar 08, 2019 3:22 pm
Forum: HELP!
Topic: Korg M1 buttons not working
Replies: 37
Views: 11967

Re: Korg M1 buttons not working

Thanks for the quick responses guys, i will check the wire/harnesses & chip
by mikepctvman
Thu Mar 07, 2019 4:45 pm
Forum: HELP!
Topic: Korg M1 buttons not working
Replies: 37
Views: 11967

Korg M1 buttons not working

Hey everyone, I got a used Korg M1, all is fine except I notice the Up/Down, A,B,C and D buttons are not working, I find it a little hard to believe six buttons could all go bad at once, I tried pressing them several times but they are dead. upon inspecting the board it looks like those six buttons ...