20 Most Recent Yamaha NP 30 76 Key Lightweight Digital Grand Piano with Touch Response Questions & Answers

The contacts of various switches and keys are likely dirty. They are often conductive rubber and need cleaning with 99% isoprophly alcohol and q-tip. Clean both the conductive rubber pill and th circuit board traces they contact.

I wrote up and photographed for my similar YDP, see solution 2 under this post:http://www.fixya.com/support/t8881187-1_key_not_spring

rubber contact strip requires replacement

Check Connections or Fuse !

What you're beng told is to reset the instrument. T/his is als refered to as reboot, or reinitalize. The instructions are at this link- Resetting Yamaha NP31 Portable Keyboard

The NP30 is no longer made. The new equivalent is the NP31. Price in the UK is listed at £ 274 most shop retail at £ 254.00 . http://www.beckettsmusic.co.uk/shop/scripts/prodView.asp?idproduct=10559

use wd 40 and a soft clothe apply on the sticky areas give it time and clean after .

There's an extremely comprehensive pair of videos about repairing this problem on YouTube thanks to David Allyn. I have embedded them below, or you can search "P70 Noisy Keyboard Repair".

cleaning the rubber pads under neat the keys should do the job .But do be care full not to use any cleaning agents or solutions .just wipe with a soft cloth.

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Yes it will work.

Your key contacts have gotten dirty. Two contacts per key are used to sense velocity and if one doesn't work the sound will be full velocity and loud.

The contacts are conductive rubber "pills" in silicone rubber domes that the key presses down onto circuit board traces under the keys. Clean both the "pills" and the black portion of the circuit board GENTLY using ONLY 99% isoprophyl alcohol and QTips. There is a lot of disassembly required and one has to keep track of where the screws go and length and thread type to re-assemble after cleaning. Also great care must be taken to not damage the ribbon cablles connecting the top and bottom halves of the case.

definitely - you have to match the voltage going in (AC) and out (DC) and check the polarity (+ or - on the plug).

I don't see you doing any damage by having a look but I would get a piano tuner or repairer in to investigate the problem expertly - no slight on you. But if your Church congregation depend on it it's well worth the money.
Good Luck