Korg C-15

Korg Concert C-15

Preliminary Information
Release Year	1992
Leak Risk	Medium
Batteries	None
Mounting Technology	Through Hole, SMD
Capacitor Types	Aluminum Electrolytic, Tantalum, Ceramic, Polymer
Destructive Entry	No

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.

Known Issues

Crackling, eventual loss of sound

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

Remove the screws shown here in red.

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.

Original Parts

Analog Board

KLM-1568B YG-M2

Capacitor Specifications and Footprint Information

RefDes	Qty	Capacitance	Voltage	Mount	Diameter/Size	Height	Lead Spacing	Temp	Type	Brand	Series
C3, C17	2	2.2 µF	50 V	Radial	5mm	10mm	5mm	85 °C	Aluminum Electrolytic	ELNA	RE2
C9, C23	2	470 µF	16 V	Radial	10mm	14mm	5mm	85 °C	Aluminum Electrolytic	ELNA	RE2
C25, C56	1	0.33 µF	50 V	Radial	5mm	10mm	5mm	85 °C	Aluminum Electrolytic	ELNA	RE2
C26	1	47 µF	16 V	Radial	5mm	10mm	5mm	85 °C	Aluminum Electrolytic	ELNA	RE2
C27, C34	2	0.47 µF	50 V	Radial	5mm	10mm	5mm	85 °C	Bipolar, Aluminum Electrolytic	ELNA	CE-BP
C47, C48	2	330 µF	16 V	Radial	8mm	11mm	5mm	85 °C	Aluminum Electrolytic	ELNA	RE2
C49, C50	2	6800 µF	50 V	Radial	26mm	46mm	10mm	85 °C	"For Audio", Large Aluminum Electrolytic	ELNA	CEW
C55	1	4700 µF	25 V	Radial	18mm	36mm	8mm	85 °C	Aluminum Electrolytic	ELNA	RE2
C57	1	100 µF	16 V	Radial	6.4mm	11.6mm	5mm	85 °C	Aluminum Electrolytic	ELNA	RE2

Logic Board

KLM-1546A YG-H2

Logic Board layout and RefDes

Closeup of all of the SMD Electrolytics

Most small SMD components do not have their RefDes printed in the silkscreen. For these components please consult the diagram shown here from page 27 of the service manual.

RefDes	Qty	Capacitance	Voltage	Mount	Diameter/Size	Height	Lead Spacing	Temp	Type	Brand	Series
C19	1	470 µF	10 V	Radial	8mm	11mm	5mm	85 °C	Aluminum Electrolytic	ELNA	RE2
C71	1	1000 µF	16 V	Radial	10mm	20mm	5mm	85 °C	Aluminum Electrolytic	ELNA	RE2
C56, C61, C65, C68, C58, C59, C75, C76, C91, C92, C84, C85, C88, C104	14	10 µF	10	SMD	4mm	6mm	5mm		Aluminum Electrolytic
C69, C73, C100, C102	4	47 µF	10 V	SMD	6mm	6mm	7mm		Aluminum Electrolytic
C86, C87	2	47 µF	6.3 V	SMD	5mm	6mm	6mm		Aluminum Electrolytic
C93	1	47 µF	25 V	SMD	6mm	6mm	7mm		Aluminum Electrolytic
C94	1	10 µF	25 V	SMD	5mm	6mm	6mm		Aluminum Electrolytic
C97	1	0.33 µF	50 V	SMD	4mm	6mm	5mm		Aluminum Electrolytic

Replacement Parts

Analog Board

Capacitors

RefDes	Qty	Compatible Part Number	Order Links
C3, C17	2	860020672006 / 50YXF2R2MEFCT15X11	Digikey Mouser LCSC
C9, C23	2	860020374012 / 16PX470MEFC8X11.5	DigiKey Mouser LCSC
C25, C56	2	50NW50R33MEFC4X5	Mouser
C26	1	860020472006 / 25PK47MEFC5*11	DigiKey Mouser LCSC
C27, C34	2	UVP1HR47MDD1TD	DigiKey
C47, C48	2	860020373011 / 16PX330MEFCTA6.3X11	DigiKey Mouser LCSC
C49, C50	2	UVR1H682MRD6	DigiKey
C55	1	25PK4700MEFC16X25 / ESK478M025AM2AA / 25YXJ4700M16X31.5	DigiKey Mouser LCSC
C57	1	860010372006	Mouser

Logic Board

Kit for SMD caps: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=b11ae2bca9

Capacitors

RefDes	Qty	Compatible Part Number	Order Links
C19	1	860010273011 / 10YXJ470M6.3X11	DigiKey Mouser LCSC
C71	1	860020375017 / 16YXJ1000M10X16	DigiKey Mouser LCSC

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)