How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Pete Your Own Question
Pete, Electronic Engineer
Category: Consumer Electronics
Satisfied Customers: 16891
Experience:  Over 16 years of experience installing and repairing electronics.
Type Your Consumer Electronics Question Here...
Pete is online now
A new question is answered every 9 seconds

Korg M1 - I just replaced switch 27 on the original switch

Customer Question

Korg M1 - I just replaced switch 27 on the original switch pc board after having r&r the board with a replacement refurb board (I am returning the board to the supplier since it, too, had a #7 switch problem). Once reassembled, I had no sound but then found that I failed to reinstall the ribbon cable plug to the DAC board which restored the sound. However, after final reassembly, I found that the bottom octave of the keyboard was unresponsive. I checked the keyboard ribbon cables, even removed and reinstalled but no success, however I did notice a limited response from the very bottom key while in the Prog 00 mode, but intermittany. Any suggestions
Submitted: 1 year ago.
Category: Consumer Electronics
Expert:  Pete replied 1 year ago.
Hi Tony,
Customer: replied 1 year ago.
Ummmm.... so, where's the answer I paid for?
Expert:  Pete replied 1 year ago.
Thanks for replying back to me.You were offline when I responded earlier
Expert:  Pete replied 1 year ago.
It may be that the ribbon cable is still not making a good connection, so try removing it, clean the end of it with electronic contact cleaner, and firmly reinsert it again.If the bottom octave keys still won't respond, then check that the keys themselves are correctly aligned with the contacts on the board underneath them and that they are making good contact with it.Let me know how you get on...Pete.
Customer: replied 1 year ago.
already applied those techniques before I asked for help, Pete. Got anything better or deeper to offer?
Expert:  Pete replied 1 year ago.
Can you test for electrical continuity when the keys are pressed to help locate the cause of the fault?
Customer: replied 1 year ago.
I will have to wait a couple of days to check that due to scheduling. Will get back to you
Expert:  Pete replied 1 year ago.
Ok, thanks for the update!Pete.
Customer: replied 1 year ago.
I will be reinspecting the cables and connections later today. TTYL, Pete
Expert:  Pete replied 1 year ago.
Thank you :)
Customer: replied 1 year ago.
I still haven't had the chance to reopen the unit for more troubleshooting die to time consumed with medical attention for both myself and my wife. As the current time, I an on a heart monitor. looks like next week will be the next opportunity for me to take another look at it. my apologies
Expert:  Pete replied 1 year ago.
That's quite alright Tony, just take your time :)You can reply back here at any time, even after rating my service :)Best,Pete.

Related Consumer Electronics Questions