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There is a well documented problem that occurs with the keybed on some of these models due to a manufacturing fault. Take a look at the keys that are sticking. Is the gap on either side of the key the same ? If not then the key normally leans slightly to the left rubbing on the adjacent key causing the sluggish action. The fixing tab at the back of the key breaks causing the spring pressure to push sideways.
You can just replace the offending key but the problem will eventually return. You could replace the whole keybed but this is a very expensive fix.
Keys are around £ 15.00 each.
Replacement keybeds around £ 450.00
Yamaha keyboards can be prone to sticking keys due to the rear part of the key cracking around the return spring - if this is the case the only solution is replacing the affected key modules. However this problem generally only occurs with long term use by very physical players.
Otherwise the problem may be caused by a build up of dust / fluff between adjacent keys - try raking out the spaces with a thin piece of fairly rigid plastic (maybe a credit card might work?)
Hi there, you'll need to open the keboard and check for the keys that has a missing mechanism on it. It usually is a stopper to prevent the keys from "sticking". You can use crazy glue or mighty bond to stick the broken parts together.
The key is to open the unit and find the exact point these are sticking. It is unlikely that vacuuming and blowing is going to improve the situation. Often the sticking is due to deformation of the case at the front draging the keys... This would be very obvious and I am sure you would have seen it and found this if it were the problem. It is not clear exactly which type of key mechanism is used here. I have several keyboard with various mechanisms. Some of the weighted ones are actually made by a single company and used by Yamaha, Korg, and several others. These are rather complex and probably not like yours. Others use a silicone rubber dome with conductive rubber contacts that press against circuit traces... for these, the restoring force is actually from the rubber dome. If the domes wear or deteriorate, then keys will not come back up. Yet another type uses a spring at the back end...M Audio uses this lightweight in some of their products.
In your case, I would look for a pivot point that might need lubricating. I was unable to find a service manual for the NP30 that would show the exact type key. I have several Yamaha keyboards that have several types of keys.
If the keys may be dragging on the side, clean with Q tips... and then you can wipe with a Q tip moistened with CRC226 available at Home Depot in the electrical dept. This is a safe lubricant for electrical uses.
Typically LOTS of screws... concentrate on those around the edge. USE GREAT care and force nothing when removing the cover...and great care of cables between the cover and the base. Mark the cables so you remember the direction they attach.
When you get edge screws out, then gentle lift and see where it seems to be held...
Some of these synths have 50 to take out to get apart. MOST are in plastic bosses and keep track of the size and length as you can put too long a one in the wrong place and crack the boss.
I use a compartmented plastic tray to keep the screws in order.
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