Korg C-15

The Korg Concert C-15 is a digital piano and midi keyboard from around 1992. It has 88 full size keys, two pedals, built in stereo speakers, and a plastic music stand. The C-15 is closely related to the C-25, and shares many elements with the C-35, C-45, and C-55; much of the repair procedure applies to all 5 models (they share one service manual, linked below), but this article was written with a C-15 for physical reference.

Causes

 * Surface mount electrolytic capacitors on the logic board failing. Replacement of through hole electrolytics on both the logic board and analog board has no effect.

Solutions

 * Replace SMD electrolytics on the logic board.

Disassembly Notes
The upper housing is attached with a hinge to the rear, and four screws along each side (see diagram): the front-most and back-most outer screws at the front legs' supporting panels, and two more screws at the middle and back of each side. Grip the front corners on both sides, lift and allow the housing to rotate up like a car hood.

Analog Board
KLM-1568B YG-M2

Logic Board
KLM-1546A YG-H2

Logic Board
If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Kits

 * Digikey BOM: https://www.digikey.com/

Related Links

 * Owner's Manual (C-15 and C-25)
 * Service Manual (C-15, C-25, C-35, C-45, and C-55)