Comments on: Freshman’s 01/W refurb

By: Hajo

Hajo — Mon, 24 Oct 2011 17:34:40 +0000

Hi Musicman,

nice to hear from you again. No specific ideas, unfortunately. A technician will have to check the two faulty boards, ideally in comparison to the working one. Get yourself a new set of of screws for a start. If they will still fall out, use a hand tap to restore the threads and then again another new set of screws.

All the best,
Hajo

By: musicman

musicman — Thu, 20 Oct 2011 19:43:33 +0000

hey Hajo im experiencing a problem with my m1 actually with both of them i did replace the burnt resister R78 with a 10 ohms one i bought in radio shack and it did play beautifully but not im experiencing cracking sound from them both, luckily i got a old one from my friend while i was home so i transfer the audio board from his to mine and it works perfect, but i would love to get my two boards up and running again do you have any idea as to the cause? also the screws are getting a bit loose at the back i have to be constantly checking it to make sure they dont fall out any idea as to how i can fix that, i really appreciate the help you have given me thus far thank you very much. you can reply to me via my address it`s [edit: removed by Hajo] thank you again.

By: Hajo

Hajo — Tue, 21 Jun 2011 17:38:49 +0000

Hi Musicman,

thanks again for your feedback and detailed report. Much appreciated! Thumbs up for your patience and courage to chance these repairs.

All the best,
Hajo

By: musicman

musicman — Sun, 12 Jun 2011 15:41:02 +0000

hey hajo well many many thanks to you once more im now finally on vacation, well as i promise i did go through my other korg m1 which was lying dead for about 4yrs my first glance at the audio board i realise that the R80 resister was burnt i test it but nothing, i then look at the other boards but found nothing, i then replace the resister and there my korg M1 was back to life except that i have to replace most of the keys, looks like the person who had it before had a great deal in making up these keys to work. presently im doing a deep clean with rubbing alcohol, replace the battery and factory sounds with a pcm card i ordered fron voice crystal. many thanks for the guidience in getting my two keyboards to life again this means so much to me. all the best in aspireing your goals and hope you continue to inspire and bring joy to others. one love

By: Hajo

Hajo — Fri, 01 Apr 2011 16:06:35 +0000

Hi Musicman,

what a great news. Many thanks for your feedback!

All the best,
Hajo

By: musicman

musicman — Wed, 30 Mar 2011 22:10:38 +0000

hey hajo sorry fot not responding soon but i had to wait untill i get to one of the ports where i can sorce the 10ohms resister, i did get it from radio shark in St Thomas(USVI), after replacing it with the 18ohms one my korg m1 came back to life many thanks to you this made me very happy i will check my othe korg m1 at home when i go on vacation sometime in june and keep you update as to the problem thank you again and all the best.

By: musicman

musicman — Sat, 26 Mar 2011 17:08:36 +0000

thanks alot bro i going to get right at it and let you know what i find i appreciate your help

By: Hajo

Hajo — Sun, 20 Mar 2011 12:50:20 +0000

Hi Musicman,

thanks for your visit and all the best for your “musical journey”. R80 and R79 (10Ω each) are part of the ±12V buffering circuitry for the op-amp stages and the ±5V stabilizing (“clamping”) circuitry for the 4053 output multiplexers. I would recommend to first check the clamp diodes ZD1 and ZD2 and the capacitors around them. If the error is not within this area, a short in either one of the ±12V or ±5V branches is the cause.

Regards,
Hajo

By: musicman

musicman — Sun, 20 Mar 2011 02:31:31 +0000

Hey Hajo at present im on a cruise ship as a musician, a few days ago whilst playing my korg m1 I got the scent of something burning immediately the power gone off then came back on when I press the keys it blurted then gone silent, later that evening while searching for help on the net I found this site which gives me a lot of hope. I must confess I have -0 knowledge of all these electrical stuff you guys mention about but for curiosity sake I went ahead looking up the problem and found that after looking at all the boards there was no traces of any leaks or corrosions everything seems perfect but after carefully looking at the board KLM-1261 which I believe is the audio section I found R79 resistor burnt one of the electricians replace it with a 18ohms one but still no sound he try other test but not sure what to look for since he never work with these stuff before.
Can someone tell me what else I should be checking for or change? its my second korg m1 for the past 5years both without sound I would really love to have them working again please. Thanks in advance.

By: AnDee

AnDee — Sat, 28 Nov 2009 09:02:06 +0000

Hey, men! Please, anybody help me – i have 01/W LCD Screen, detached from it’s place on panel. sorry for broken English (I’m from Ukraine:)

Please, how can i fasten it? Some special Glue? Which?