Welcome to the Piano World Piano Forums
Over 2 million posts about pianos, digital pianos, and all types of keyboard instruments
Join the World's Largest Community of Piano Lovers (it's free)
It's Fun to Play the Piano ... Please Pass It On!

SEARCH
the Forums & Piano World

This custom search works much better than the built in one and allows searching older posts.
(ad 125) Sweetwater - Digital Keyboards & Other Gear
Digital Pianos at Sweetwater
(ad) Pearl River
Pearl River Pianos
(ad) Pianoteq
Latest Pianoteq add-on instrument: U4 upright piano
(ad) P B Guide
Acoustic & Digital Piano Guide
PianoSupplies.com (150)
Piano Accessories Music Related Gifts Piano Tuning Equipment Piano Moving Equipment
We now offer Gift Certificates in our online store!
(ad) Estonia Piano
Estonia Piano
Quick Links to Useful Stuff
Our Classified Ads
Find Piano Professionals-

*Piano Dealers - Piano Stores
*Piano Tuners
*Piano Teachers
*Piano Movers
*Piano Restorations
*Piano Manufacturers
*Organs

Quick Links:
*Advertise On Piano World
*Free Piano Newsletter
*Online Piano Recitals
*Piano Recitals Index
*Piano Accessories
* Buying a Piano
*Buying A Acoustic Piano
*Buying a Digital Piano
*Pianos for Sale
*Sell Your Piano
*How Old is My Piano?
*Piano Books
*Piano Art, Pictures, & Posters
*Directory/Site Map
*Contest
*Links
*Virtual Piano
*Music Word Search
*Piano Screen Saver
*Piano Videos
*Virtual Piano Chords
Topic Options
#1230319 - 07/12/09 08:44 AM Korg concert 3500 keybed
dracable Offline
Junior Member

Registered: 07/12/09
Posts: 8
just bought a korg concert 3500 keyboard but a few keys are slow/nonfunctional. one of the keys is louder then all the rest. from what ive been reading, it sounds like the contact pads might be dirty and/or keys need to be lubricated. im not really sure how to go about disassembling the unit as it didnt come with a user or service manual. any ideas how to go about disassembling the unit or some kind of safe lube/cleaner that could be sprayed in the area? thanks!

Top
(ads) Sweetwater / Roland
Kawai Superb Stage Piano and Controller

Click Here


#1230346 - 07/12/09 10:04 AM Re: Korg concert 3500 keybed [Re: dracable]
jpscoey Offline
Full Member

Registered: 02/02/09
Posts: 306
Loc: Manchester, England, UK.
Originally Posted By: dracable
...one of the keys is louder then all the rest.
from what ive been reading, it sounds like the contact pads might be dirty and/or keys need to be lubricated.

im not really sure how to go about disassembling the unit as it didnt come with a user or service manual. any ideas how to go about disassembling the unit or

some kind of safe lube/cleaner that could be sprayed in the area? thanks!


I had a similar problem with my Nord Electro keyboard - two (adjacent) notes weren't 'playing'.

I sought some advice, and I learnt that a 'saturation' with a spray cleaner could be
potentially disasterous..... DON'T DO IT!!!!!!!!

The general rule to dismantling a keyboard is -

the screws (usually on the underside) that are in a stright (normally double) line are the
ones that hold the actual keys/keybed in place.

The ones to undo first are the ones that hold the 'case' in place.

After that, use a cotton bud (moistened with contact cleaner) to gently clean the contact points.

A heavy-handed spray of everything could lead to all kinds of problems.

.
_________________________
John Schofield. NTC Dip. , C.G.L.I.
Professional piano tuner/technician since 1982.
myspace

Top
#1230610 - 07/12/09 08:40 PM Re: Korg concert 3500 keybed [Re: jpscoey]
dracable Offline
Junior Member

Registered: 07/12/09
Posts: 8
im still kind of confused. i have screws underneath that take off the front panel so i can see the underside of the keybed, and then i have 5 screws in a line on the underside of the unit. if these are holding the keybed in, im not sure how to get the keybed out. oh also, the keybed will come out in 1 solid piece, right? i went down to my hardware store and bought some contact cleaner, white lithium grease, and q-tips... i just cant figure out ho toget the damn keybed out! will it take some force to get it out or should it just slide right out?


Edited by dracable (07/12/09 08:44 PM)

Top
#1230614 - 07/12/09 08:49 PM Re: Korg concert 3500 keybed [Re: dracable]
Kubla Online   content
Full Member

Registered: 04/26/09
Posts: 25
Loc: Southeastern Massachusetts
If this is a new keyboard it should be under warranty by the manufacturer. Trying to fix it yourself will (most likely) nullify the warranty. It sounds like the keyboard is defective. The best thing to do is to look into returning it.
_________________________
Yamaha U3
Yamaha YPG 635

Top
#1230618 - 07/12/09 08:54 PM Re: Korg concert 3500 keybed [Re: Kubla]
dracable Offline
Junior Member

Registered: 07/12/09
Posts: 8
it's not a new keyboard and is not under warranty. in fact, i can barely find info on it because they were made in the very late 80's. it was one of the first ever keyboards to support midi from what i hear. i really dont have many options as i live in a somewhat rural area and have limited options for finding a repair shop that would work on it. i'd like to try to tackle this myself.

Top
#1230621 - 07/12/09 09:00 PM Re: Korg concert 3500 keybed [Re: dracable]
jpscoey Offline
Full Member

Registered: 02/02/09
Posts: 306
Loc: Manchester, England, UK.
Originally Posted By: dracable
... i just cant figure out ho toget the damn keybed out!
will it take some force to get it out or should it just slide right out?


NO - you shouldn't have to 'force' anything.

.
_________________________
John Schofield. NTC Dip. , C.G.L.I.
Professional piano tuner/technician since 1982.
myspace

Top
#1230625 - 07/12/09 09:05 PM Re: Korg concert 3500 keybed [Re: jpscoey]
dracable Offline
Junior Member

Registered: 07/12/09
Posts: 8
that's what i figured, i just cant figure out how it's going to come out, or how i can access the contacts.

Top
#1230633 - 07/12/09 09:17 PM Re: Korg concert 3500 keybed [Re: dracable]
jpscoey Offline
Full Member

Registered: 02/02/09
Posts: 306
Loc: Manchester, England, UK.
Originally Posted By: dracable
that's what i figured, i just cant figure out how it's going to come out, or how i can access the contacts.


if anything sems to be 'snagging' - take a closer look.

All these things were connected one-by-one in the original manufacture -

so they can be 'dis-assembled' in the same way.

PS - make sure you keep a note where you've removed the screws/connections from !

.
_________________________
John Schofield. NTC Dip. , C.G.L.I.
Professional piano tuner/technician since 1982.
myspace

Top
#1230641 - 07/12/09 09:30 PM Re: Korg concert 3500 keybed [Re: jpscoey]
dracable Offline
Junior Member

Registered: 07/12/09
Posts: 8
nothing's really "snagging". ive loosened every screw i can find and the keybed barely moves at all.

Top
#1230660 - 07/12/09 10:04 PM Re: Korg concert 3500 keybed [Re: dracable]
jpscoey Offline
Full Member

Registered: 02/02/09
Posts: 306
Loc: Manchester, England, UK.
Originally Posted By: dracable
nothing's really "snagging". ive loosened every screw i can find and the keybed barely moves at all.


There must be an extra screw/connection somewhere that you're missing?
_________________________
John Schofield. NTC Dip. , C.G.L.I.
Professional piano tuner/technician since 1982.
myspace

Top
#1230661 - 07/12/09 10:09 PM Re: Korg concert 3500 keybed [Re: jpscoey]
dracable Offline
Junior Member

Registered: 07/12/09
Posts: 8
i cant even see any of the connecters. i cant even get the case fully open

Top
#1230663 - 07/12/09 10:17 PM Re: Korg concert 3500 keybed [Re: dracable]
jpscoey Offline
Full Member

Registered: 02/02/09
Posts: 306
Loc: Manchester, England, UK.

it's bedtime for me now (3.15 am in the UK) -

I'll try to work on an answer for you in the morning.
_________________________
John Schofield. NTC Dip. , C.G.L.I.
Professional piano tuner/technician since 1982.
myspace

Top
#1230673 - 07/12/09 10:32 PM Re: Korg concert 3500 keybed [Re: dracable]
dracable Offline
Junior Member

Registered: 07/12/09
Posts: 8




a few photos to hopefully help you with what im looking at here. the silver things on the bottom appear to be non-removable and it looks like they hold the speakers

Top
#1231278 - 07/14/09 03:59 AM Re: Korg concert 3500 keybed [Re: dracable]
dracable Offline
Junior Member

Registered: 07/12/09
Posts: 8
so i figured out how to get the case off and i cleaned the circut board off (it looked like something sticky had been spilled and dried on it). all my keys are now functional. wohoo!!! the only problem im looking at now is the 2 keys that are playing at maximum volume no matter what velocity you hit them. oh also, i have 1 or 2 keys that sometimes stick or stay down when you play them. im guessing they just need to be lubricated, but im not sure exactly which part of the keys need to be lubricated. any help?

Top
#1231351 - 07/14/09 10:01 AM Re: Korg concert 3500 keybed [Re: dracable]
LeendertB Offline
Junior Member

Registered: 07/13/09
Posts: 1
Hi,
I have just 'repaired' keybed on a korg 3500.
To open the casing remove the black scresw (bolts) underneath. You may have to take the keybord off the stand (heavy!!). After removing screws, be careful with moving it, because actual keybed will lay somewhat loose in the case and could damage the printboards in the casing. When the casing is right side up, it should open like the hood of a car. Mind that there are some cables that limit opening to about 90 degrees.

Keyboard is connected with main print boards by flatcables, you can remove these. Then remove keyboard and put it upside down. You will see three long printboards under keyboard, each with some screws to hold them into place. Remove the scres, and remove boards (you might want to mark which board belongs where, they are NOT interchangeble, or take picture of them..).
Then you will see a long white soft plastic strip, with 2 black contact strips on the other side. You can totally remove this strip, clean it with non-agressive cleaner (cloth with a bit of household cleaner), let it dry thouroughly and place back. Is also a good idea to clean the contact points (w dehydrated alcohol) on keys, while you are at it. You should also examine if the white strip isn't damaged. A piano repairist I consulted told me this sometime happens. Replace parts are however still on the market (by yamaha service centre here in the Netherlands). When you replace strip make shure it is not under stress somewhere.
Then replace the prints, etc.

In my case the keyboard had a little damage form water, and I had to replace two of the long prints on the keyboard (were not very expensive, about 30 US dollar each). Could also be the case with your keyboard.

Succes with repairs. If you have trouble opening the case i could send you some photo's.

Top
#1231892 - 07/15/09 10:26 AM Re: Korg concert 3500 keybed [Re: LeendertB]
Agathis Offline
Full Member

Registered: 08/06/05
Posts: 420
Loc: Southwest
Funny you mention this piano. I played a concert 5000 for 20 years. bought it new in late 80's for $2500 and it never gave me any problems. I even lugged that tank to a couple gigs! Sold it at a garage sale for $150, prolly got ripped off but wifey was on me to make it gone. smile

Top
#1324554 - 12/13/09 02:45 PM Re: Korg concert 3500 keybed [Re: LeendertB]
Antoine Latour Offline
Junior Member

Registered: 12/13/09
Posts: 1
Loc: France
Hello everybody.

I just had the same story, i found a C-3500 in a garage sale few weeks ago. Same problem with the center of the keyboard. I open it and totaly unmount. I clean every key with white spirit, then remount them using silicone grease (usually used for taps lubrification in plumbery).
But the white long strip, the one with the two black line which conducts is damaged in the center of the keyboard. As result, the center octave is no longer ok, no dynamic, no softness.
So i read your post and my question is : "where did you found spare parts ?" Here in france it's seems really hard ; no piano repairist wanted to even think of looking for it... Do you think your own reseller could sell it to me ?
Regards from France,
Antoine

Top

Moderator:  Piano World 
What's Hot!!
HOW TO POST PICTURES on the Piano Forums
-------------------
Sharing is Caring!
About the Buttons
-------------------
Forums Rules & Help
-------------------
ADVERTISE
on Piano World

The world's most popular piano web site.
-------------------
PIANO BOOKS
Interesting books about the piano, pianists, piano history, biographies, memoirs and more!
(ad) HAILUN Pianos
Hailun Pianos - Click for More
Ad (Seiler/Knabe)
Seiler Pianos
Sheet Music
(PW is an affiliate)
Sheet Music Plus Featured Sale
(125ad) Dampp Chaser
Dampp Chaser Piano Life Saver
(ad) Lindeblad Piano
Lindeblad Piano Restoration
Who's Online
92 registered (Badinage, AZNpiano, Anticlock, 27 invisible), 911 Guests and 16 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
76011 Members
42 Forums
157172 Topics
2308407 Posts

Max Online: 15252 @ 03/21/10 11:39 PM
New Topics - Multiple Forums
EDTA solution to clean pedals, handles, etc
by Olek
Today at 01:34 AM
AMusA exam questions
by Badinage
Today at 01:24 AM
ES7 - Gig Bag or Hard Case
by gbitw
Yesterday at 11:07 PM
special gloves to reinforce good hand position
by Will1
Yesterday at 09:10 PM
Frederick Historical Concert Season - Fall 2014
by Terrytunes
Yesterday at 08:44 PM
(ads by Google)

Visit our online store for gifts for music lovers

 
Help keep the forums up and running with a donation, any amount is appreciated!
Or by becoming a Subscribing member! Thank-you.
Donate   Subscribe
 
Our Piano Related Classified Ads
|
Dealers | Tuners | Lessons | Movers | Restorations | Pianos For Sale | Sell Your Piano |

Advertise on Piano World
| Subscribe | Piano World | PianoSupplies.com | Advertise on Piano World | Donate | Link to Us | Classifieds |
| |Contact | Privacy | Legal | About Us | Site Map | Free Newsletter | Press Room |


copyright 1997 - 2014 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission