KORG Concert C-55 piano schematic ?

[Tilman]

Hi,

there is no tone coming out of this thing. The amplifier is working, all LEDs are ON, the main board gets +5,-11 and +20V. I think it is something on the main board. Does anyone have a schematic for this or can give me a hint where to look ?

Thanks!
Tilman

P.S. : If it is warmed up - it makes noises like a machine gun and after that - I can here a piano sound but it is a very quiet one.
Than - the machine gun disappears but the piano sound too.....

[doctor]

Hi,

there is no tone coming out of this thing. The amplifier is working, all LEDs are ON, the main board gets +5,-11 and +20V. I think it is something on the main board. Does anyone have a schematic for this or can give me a hint where to look ?

Thanks!
Tilman

P.S. : If it is warmed up - it makes noises like a machine gun and after that - I can here a piano sound but it is a very quiet one.
Than - the machine gun disappears but the piano sound too.....

I have service manual for 15/25/35/45/55 models. It's too large (>5MB) to upload.
Send me your e-mail address.

[Tilman]

Hi,

in case someone is interested:

Doctor were so kind to send my the service manuals. Those pianos have a nice self test mode where a lot of internal functions are checked by the pianos software.
I did these tests and it failed to pass the DSP test. I don't think the DSP board is repairable (at least not for me) so I asked KORG for a replacement board.
They said it is no longer available.
Game over.

Tilman

[ClaudeL]

Hi,

I get a serious problem with a Korg Concert C-25 : when power on everything is OK, but after about 1 or 2 minutes the sound is covered by a continuous roar !
So I think the service manual for 15/25/35/45/55 models of Doctor or Tilman would be very helpfull to try to fix this problem.

Doctor or Tilman could you tell me how to get these manuals ?

I thank you very much
Claude

P.S. Excuse-me it is difficult for me to write in english and I can't german at all :-(

[Tilman]

Hi Claude,

can you send your mail address ? I will send you the manuals by mail.
Tilman

[ClaudeL]

Hi Tilman,

Thank you very much for your answer.
You can try to send me the manuals at claude.lacombe2(at)free.fr (replacing (at) by @ )
I am sorry you can't fix your problem with your C-55 :-(

Claude

[Garti]

Need C15 Manuals

Hi Claude,

can you send your mail address ? I will send you the manuals by mail.
Tilman

Hi Tilman,

I have a similar problem with my C15, all the electronics looks ok, but there is no sound, can you please send me the manuals. My email is ricardopadillae@hotmail.com

thanks in advance

[cpierredon]

please send me the service manuals of C15/25/55
cpierredon@yahoo.fr

tank you

[kurtdaniel]

I have service manual for 15/25/35/45/55 models. It's too large (>5MB) to upload.
Send me your e-mail address.

need it too,,tnx.. please send it to my email grunger_silverchair@yahoo.com..thank you very much..
(KORG Concert C-55)

[roman]

I have had my Korg Concert C 55 for 14 years and only now, after playing the piano for 10 minutes, a hissing - crackling sound begins.
May request a copy of schematics for the C 55? Very much appreciated.

[nabal]

Service-Manual would be great

Hello to doctor and Tilman,

my C-55 does still play. But after some time, it begins with a crackling sound an sometimes the tone does fall very silent.
I had a friend looking into the piano. He said, that there is a battery inside, which hat a leakage and so disturbed the contacts. But without the schematic, he is not able to have it fixed.

So doctor or Tilman - or whoever has a service manual: could you please eMail this to me as well ( nabal(at)rd-lorenz.com) ? Your help is greatly appreciated. We use the Piano at church, so it would be very kind, if you could help us out.

Thanks in advance,
Regards, nabal

[doctor]

Hello to doctor and Tilman,

my C-55 does still play. But after some time, it begins with a crackling sound an sometimes the tone does fall very silent.
I had a friend looking into the piano. He said, that there is a battery inside, which hat a leakage and so disturbed the contacts. But without the schematic, he is not able to have it fixed.

So doctor or Tilman - or whoever has a service manual: could you please eMail this to me as well ( nabal(at)rd-lorenz.com) ? Your help is greatly appreciated. We use the Piano at church, so it would be very kind, if you could help us out.

Thanks in advance,
Regards, nabal

See http://music-electronics-forum.com/t23718/ and http://music-electronics-forum.com/t23719/

Good luck.

[nabal]

Thank you

Hello doctor and Tilman,

thank you for your help.
Sorry, I did not see the threads with the PDF-downloads before. In the pdf-file for the block-diagrams (see http://music-electronics-forum.com/t23718/) , the C-55 is missing, but in the file, that Tilman sent me over it is there.
So I got everything and hopefully my friend will be able to get the piano back working in a reliable way again.

Thanks again,
Regards, nabal

[rich valentine]

Hello - I am currently working on a c15s. The caps are mostly bad on the main board. especially the 10/10s. I am also looking for a schematic to finish this unit. The same problem you had. It is before the volume control. I am thinking the dac ic or op amp. Power supply and amp are fine.

[rich valentine]

If you still have a schematic available for the Korg c15s I would love a copy of the scematic for the main board.
Thank you
Rich Valentine rva@cccp.com