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Korg C- 155 Digital Piano - Sound comes on after 15 minutes of being turned on.

Piano has to be on for about 15 minutes before we get any sound. Almost like it has to be warmed up. Then it plays fine. It is 15 years old and just started doing this.

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All of the above answers are wrong.

First off, forget about 6ya! Sixya, fixya, scam artists all. See for example, https://tinyurl.com/ybpds4h5. Calling them for a digital piano repair would be like calling a plumber to do brain surgery.

She's asking about a KORG C-155. Not a Roland anything. Not a Technics anything. Not a Kurzweil anything. And the problem isn't about dead notes or intermittent loss of touch sensitivity, or volume issues. Her piano is dead until after a 15 minute warm-up and then plays NORMALLY! This issue just about screams, "POWER SUPPLY PROBLEM!" At least, this is the first place to begin.

For the average user, this is not a DIY project. Troubleshooting it will require an experienced technician with the proper instruments and tools at least an hour to open the unit (ker-ching!), take some measurements, identify the defective assembly or component. Then on a 25 year old unit, he would need to start hunting for replacement part(s), since KORG very likely no longer stocks parts on a unit that old.

That is probably why the typical answer from a professional would be, "save your money, and buy a new unit." Because of the parts issue, the cost of the repair will likely be in the hundreds of dollars (ker-ching!), and when it breaks down again with something else (ker-ching! ker-ching!).

I'm not saying the piano can't be fixed, but I am asserting that it can't be fixed economically by a professional who cannot afford to spend many hours on isolating a defect, hunting online for a USED replacement assembly, or a NEW component (assuming that the repair involves just one or two individual components), then actually doing the repair, and putting the unit back together, and only get paid for a fraction of the actual time involved.

Posted on Nov 27, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 17 Answers

SOURCE: korg c-56 struck by lightning.

if your keyboard has been affected by a lightning strike then every semicondutor ( diode transistor i/c ) will be blown ...I know most components are on the mother board but not all ...I reckon cheaper to buy a new one ...sorry

Posted on Feb 02, 2009

  • 1138 Answers

SOURCE: I have a Technics digital piano with 1 dead key.

If your piano is the same as mine, there is a rubber membrane with contacts imbedded in it that sits on top of a circuit board. The key pushes the contact in the membrane onto the contact causing a note on. What happens is the cylindrical part of the membrane that holds the contact can get torn and the contact will no longer travel in a straight line to trigger the note. The entire membrane strip has to be replaced. The strip on my piano was discontinued and I had to manufacture one from an extra Roland membrane that had some bad contacts in it. You will have to contact Technicsat www2.panasonic.com/webapp/wcs/stores/servlet/PNAEndecaSearchCmd for support. If you don't feel comfortable tackling the repair yourself consult a good piano tuner/repair place in your area for advice.

Posted on Jun 23, 2009

  • 5603 Answers

SOURCE: It's a Roland HP-7e digital piano about three years old.

You may need to clean the contacts which are usually conductive rubber. I explained stuff for another Roland problem with two keys that were intermittent. I have an EP-7 that I had to do the cleaning of the key contacts. Use 91 or 99 % Isoprophyl alcohol to clean BOTH the conductive "pill" (Black under silicone rubber domes) AND the traces on the board where they press. Clean gently as the traces have a hard black coating.

Posted on Jul 29, 2009

  • 5603 Answers

SOURCE: Need help connecting Korg C-303 (Concert Piano)

Assuming the C-303 has a MIDI out, connect a MIDI cable from the MIDI output of the C-303 to the MIDI input of the symphony module.

Connect two audio cables (mono 1/4 inch) from the symphony module to a suitable audio amplification system OR possibly into auxilary audio input jacks of the C-303, if they exist.

I have a Symphony module but not the piano you have and I have mine connected to a Yamaha organ.

Posted on Aug 29, 2009

  • 5603 Answers

SOURCE: Kurzweil digital piano unpredictable voices and volume

The contacts of various switches and keys are likely dirty. They are often conductive rubber and need cleaning with 99% isoprophly alcohol and q-tip. Clean both the conductive rubber pill and th circuit board traces they contact.

Posted on Sep 17, 2009

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Just go to COMBI mode.

dual-voice-x5d-korg-lke-piano-strings-v3bkdlfzxxldunukh1pdnvp1-3-0.jpg

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I have a Korg C-15s and also experiencing loud crackling sounds when I turn it on. The problems seems to be either the sliding volume control or the amplifier itself. Honestly though, I believe the issue is the volume control. I opened my piano to get a closer look and attempted to clean the contacts on the volume. Unfortunately after cleaning the contacts, the crackling sounds became somewhat worse. After I turn the piano on, the volume control is generally rendered useless......volume set to low volume and the noise is quite loud and other times the volume control is set high and get very low volume crackling noise. No real consistency. The noise does diminish after a few minutes but so does the piano sounds to an inaudible level. There were a couple of instances where I turned it on and surprising enough, no no noise and perfect sound. For these reasons I believe the issue is within the volume control and not so much the amplifier. I have an electronics background and noticed that the volume control is very unique in design and is not something that can be substituted with another volume control from other sources.

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sinds een paar dagen wil hij niet meer hard spelen ,je hoort hem alleen nog maar in de verte .
alles is goed aangesloten ,schuifje staat op zijn hardst en er staat ook stroom op ,want het lichtje brand .
kan iemand mij vertellen wat ik daar aan kan doen ,ik wil hem nog niet kwijt ,misschien is het maar een kleinigheid.

vriendelijke groet

mevr v haasteren

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