Korg C-15: Difference between revisions

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|Picture =  
|Picture =  
|Release Year = 1992
|Release Year = 1992
|Mounting Technology = Through Hole, SMD, BGA, Sockets
|Mounting Technology = Through Hole, SMD
|Capacitor Types = Aluminum Electrolytic, Tantalum, Ceramic, Polymer
|Capacitor Types = Aluminum Electrolytic, Tantalum, Ceramic, Polymer
|Leak Risk = Medium
|Leak Risk = Medium
Line 10: Line 10:
|Destructive Entry = No
|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, but this article was written with a C-15 for physical reference.
The Korg Concert C-15 is a digital piano and midi keyboard from around 1992. It has 88 full size weighted keys, two pedals, downward firing 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==
==Known Issues==
===Symptom or Problem Encountered===
===Crackling, eventual loss of sound===
====Causes====
====Causes====
*Description of cause
*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====
====Solutions====
*Solution to the problem
*Replace SMD electrolytics on the logic board.<ref>Aroustamian, A. (Director). (2015, February 22). ''How to repair korg c-25 concert piano no sound''. <nowiki>https://www.youtube.com/watch?v=5quEzghNKlE</nowiki></ref>
==Disassembly Notes==
==Disassembly Notes==
[[File:Korg C-15 screw diagram.png|thumb|Remove the screws shown here in red.]]
[[File:Korg C-15 screw diagram.png|thumb|Remove the screws shown here in red.]]
The '''upper housing''' is attached with a hing 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.  
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==
==Original Parts==
===Basic PCB Name===
===Analog Board===
''Note model numbers and board revisions here''
KLM-1568B YG-M2
{| class="wikitable sortable"
{| class="wikitable sortable"
|+Capacitor [[Capacitor Specifications|Specifications]] and [[Part Footprints|Footprint]] Information
|+Capacitor [[Capacitor Specifications|Specifications]] and [[Part Footprints|Footprint]] Information
Line 38: Line 39:
!Series
!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
[[File:Korg C-15 logic board refdes diagram.png|thumb|Logic Board layout and RefDes]]
[[File:SMD Electrolytics Closeup.jpg|thumb|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.
{| class="wikitable"
|+
!RefDes
!Qty
!Capacitance
!Voltage
![https://caps.wiki/wiki/Part_Footprints Mount]
!Diameter/Size
!Height
!Lead Spacing
!Temp
![https://caps.wiki/wiki/Capacitor_Types 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
|
|
|0 µF
|Aluminum Electrolytic
|
|
|
|
|-
|C94
|1
|10 µF
|25 V
|SMD
|5mm
|6mm
|6mm
|
|
|Aluminum Electrolytic
|
|
|
|
|0 °C
|-
|C97
|1
|0.33 µF
|50 V
|SMD
|4mm
|6mm
|5mm
|
|
|Aluminum Electrolytic
|
|
|
|
|}
|}
==Replacement Parts==
==Replacement Parts==
===Basic PCB Name===
===Analog Board===
{| class="wikitable sortable"
{| class="wikitable sortable"
|+Capacitors
|+Capacitors
Line 60: Line 289:
!Order Links
!Order Links
|-
|-
|
|C3, C17
|
|2
|
|860020672006 / 50YXF2R2MEFCT15X11
|[https://www.digikey.com/ Digikey]
|[https://www.digikey.com/en/products/detail/w%C3%BCrth-elektronik/860020672006/5727089 Digikey] [https://www.mouser.com/ProductDetail/Wurth-Elektronik/860020672006?qs=0KOYDY2FL28W7SLhCnyRPw%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Rubycon-50YXF2R2MEFCT15X11_C2843283.html LCSC]
|-
|C9, C23
|2
|860020374012 / 16PX470MEFC8X11.5
|[https://www.digikey.com/en/products/detail/w%C3%BCrth-elektronik/860020374012/5727036 DigiKey] [https://www.mouser.com/ProductDetail/Wurth-Elektronik/860020374012?qs=0KOYDY2FL2%252Bw9eSPj%252BT32g%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Rubycon-16PX470MEFC8X11-5_C88766.html LCSC]
|-
|C25, C56
|2
|50NW50R33MEFC4X5
|[https://www.mouser.com/ProductDetail/Rubycon/50NW50R33MEFC4X5?qs=sGAEpiMZZMvwFf0viD3Y3fHxNcSaiftwezo6EL%2FbeQxj9ZHUdCpl6w%3D%3D Mouser]
|-
|C26
|1
|860020472006 / 25PK47MEFC5*11
|[https://www.digikey.com/en/products/detail/w%C3%BCrth-elektronik/860020472006/5727060 DigiKey] [https://www.mouser.com/ProductDetail/Wurth-Elektronik/860020472006?qs=0KOYDY2FL297CiYdK70wDg%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Rubycon-25PK47MEFC5-11_C109370.html LCSC]
|-
|C27, C34
|2
|UVP1HR47MDD1TD
|[https://www.digikey.com/en/products/detail/nichicon/UVP1HR47MDD1TD/4328909 DigiKey]
|-
|C47, C48
|2
|860020373011 / 16PX330MEFCTA6.3X11
|[https://www.digikey.com/en/products/detail/w%C3%BCrth-elektronik/860020373011/5727035 DigiKey] [https://www.mouser.com/ProductDetail/Wurth-Elektronik/860020373011?qs=0KOYDY2FL29%2Fv5JUGXWgRw%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Rubycon-16PX330MEFCTA6-3X11_C239307.html LCSC]
|-
|C49, C50
|2
|UVR1H682MRD6
|[https://www.digikey.com/en/products/detail/nichicon/UVR1H682MRD6/588859 DigiKey]
|-
|C55
|1
|25PK4700MEFC16X25 / ESK478M025AM2AA / 25YXJ4700M16X31.5
|[https://www.digikey.com/en/products/detail/rubycon/25PK4700MEFC16X25/3564433 DigiKey] [https://www.mouser.com/ProductDetail/KEMET/ESK478M025AM2AA?qs=ic1jaF55hEmtYVyiLRpGeA%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Rubycon-25YXJ4700M16X31-5_C700837.html LCSC]
|-
|C57
|1
|860010372006
|[https://www.mouser.com/ProductDetail/Wurth-Elektronik/860010372006?qs=sGAEpiMZZMvwFf0viD3Y3aZipiehufnXVtAR4Gd6GuT2cArYVaWZww%3D%3D Mouser]
|}
===Logic Board===
{| class="wikitable sortable"
|+Capacitors
!RefDes
!Qty
!Compatible Part Number
!Order Links
|-
|C19
|1
|860010273011 / 10YXJ470M6.3X11
|[https://www.digikey.com/en/products/detail/w%C3%BCrth-elektronik/860010273011/5726952 DigiKey] [https://www.mouser.com/ProductDetail/Wurth-Elektronik/860010273011?qs=0KOYDY2FL28ooChuQJugtQ%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Rubycon-10YXJ470M6-3X11_C432359.html LCSC]
|-
|C71
|1
|860020375017 / 16YXJ1000M10X16
|[https://www.digikey.com/en/products/detail/w%C3%BCrth-elektronik/860020375017/5727041 DigiKey] [https://www.mouser.com/ProductDetail/Wurth-Elektronik/860020375017?qs=0KOYDY2FL2%252BnTguXhGt7pQ%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Rubycon-16YXJ1000M10X16_C88751.html LCSC]
|-
|C56, C61, C65, C68, C58, C59, C75, C76, C91, C92, C84, C85, C88, C104
|14
|865080340001
|[https://www.mouser.com/ProductDetail/710-865080340001 Mouser]
|-
|C69, C73, C100, C102, C93
|5
|VZL470M1VTR-0606
|[https://www.mouser.com/ProductDetail/140-VZL470M1VTR-0606 Mouser]
|-
|C86, C87
|2
|865080342006
|[https://www.mouser.com/ProductDetail/710-865080342006 Mouser]
|-
|C94
|1
|865080642006
|[https://www.mouser.com/ProductDetail/710-865080642006 Mouser]
|-
|C97
|1
|UWP1HR33MCL1GB
|[https://www.mouser.com/ProductDetail/647-UWP1HR33MCL Mouser]
|}
|}
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''
===Kits===
===Kits===
*Digikey BOM: https://www.digikey.com/
*Logic Board on [https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=b11ae2bca9 Mouser]
==Related Links==
==Related Links==
*[https://www.korg.com/us/support/download/manual/1/319/3672/ Owner's Manual] (C-15 and C-25)
*[https://www.korg.com/us/support/download/manual/1/319/3672/ Owner's Manual] (C-15 and C-25)
Line 73: Line 387:
==References==
==References==
<references />
<references />
[[Category:WorkNeeded:General]]
[[Category:Musical Keyboard]]
[[Category:WorkNeeded:OriginalParts]]
[[Category:1990s]]
[[Category:WorkNeeded:ReplacementParts]]
[[Category:Musical]]

Latest revision as of 02:23, 12 January 2024

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 weighted keys, two pedals, downward firing 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.[1]

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

Capacitors
RefDes Qty Compatible Part Number Order Links
C19 1 860010273011 / 10YXJ470M6.3X11 DigiKey Mouser LCSC
C71 1 860020375017 / 16YXJ1000M10X16 DigiKey Mouser LCSC
C56, C61, C65, C68, C58, C59, C75, C76, C91, C92, C84, C85, C88, C104 14 865080340001 Mouser
C69, C73, C100, C102, C93 5 VZL470M1VTR-0606 Mouser
C86, C87 2 865080342006 Mouser
C94 1 865080642006 Mouser
C97 1 UWP1HR33MCL1GB Mouser


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

Related Links

References

  1. ↑ Aroustamian, A. (Director). (2015, February 22). How to repair korg c-25 concert piano no sound. https://www.youtube.com/watch?v=5quEzghNKlE
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