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Just found it again here - http://www.kawai.de/ca51_en.htm
So it would appear that it is for the older actions.

The main difference between the AWA PRO II and RM3 that I am already aware of is that the fulcums on the RM3 are set back on the black keys (as they are on acoustics) so that the leverage ratio is the same on the black and white keys. This is not the case for the AWA PRO 1 and 2. If it is noticeable, it would mean that on the PRO 2 the back of the black key would be harder than the front to a larger degree than on the RM3.

Just found these Kawai MP9000 key pix: http://xahlee.org/piano/kawai_mp9000_piano_key_action.html

Bonus - a harpsichord made of LEGO! http://www.henrylim.org/Harpsichord.html

Anyone seen CP300 pics? I want to open mine. I'm generally very handy, but I always prefer to use instructions if available.

Just added a link on first post to this thread for Lawrence's Yamaha AG N3 key regulation post.

dewster, you're gonna love this:

http://www.norduserforum.com/nord-stage-forum-f3/ns2-in-the-nude-t2647.html

*Shwing!*

http://www.norduserforum.com/nord-stage-forum-f3/ns2-in-the-nude-t2647.html
- Nord: NS2, Wave, Lead3, Rack2 - brains & chopped keys
- Access: Virus TI - brains

http://www.sequencer.de/synthesizer/viewtopic.php?t=17673
- Nord: Lead1, Rack2 - guts

http://midibox.org/forums/topic/764...d-3-virus-ti-pulse-xt-andromeda-updated/
- Dave Smith: Poly Evolver - guts
- Access: Virus TI - guts

All added to the first post, muchas gracias!

Any further analysis on the Nord Stage 2?

I would love to see the action and insides of a FP4 (not F.) I'm curious why I like this older action. I've done much research with Google but can't find anything.

The hacked off end keys are really surprising.

Not a lot of flash in there compared to what they should be doing with today's standards (my standard lament).

I don't understand why many DSPs are running at 150 MHz when PC processors are running in excess of 3 GHz. For what you pay for with multiple DSPs (6!) you might as well be using an FPGA with a high speed SDRAM interface and tens or hundreds of ALUs running in parallel. You could do thousands of second order filters in a low-end FPGA. Maybe it's a cost or lack of in-house expertise thing?

Hello,

I'm new to the forums, and wanted to start by showing some CVP-305 intimate pictures

This is my Clavinova CVP305 without the top cover. The keyboard is not visible as it's hidden under the cover (the brown piece to the right of the picture)



This seems the main board with yamaha DSPs:


When the top cover is fully removed you can see the keyboard. Looking at those short keys is no wonder that the action is not very close to the real thing:


In this perspective you can see the key weights. As this is a GH3, it have 3 different weight zones:


By unscrewing the keyboard you can clearly see the weights and the action. The green boards are the ones with the sensors. It has three sensors in the GH3 models but they are not visible because they are on the other side of the board (the one that contacts with the keys):


This is a disasembled GHD keyboard. In it you can see the two sensors (the GH3 version has 3):


And last, a sideways view of the keys:

GH3 doesn't mean there are three different weighting groups, it means there are three sensors for each key.

Welcome Carlos, and thanks for the pix!

I can't make out the chip numbers, but there is apparently a sample playback board with two different processors lashed to an I/O board with yet another processor. And look at all those wires! I'd think an integrated redesign would be cheaper and potentially more reliable than this bits and pieces approach (but that could strand old inventory). Must be kind of a pain to manufacture.

Hello EssBrace,

yes GH3 is for the 3 sensors. But it happens there are also 3 different weights. It's written in the boards as H, M and L, and the metal weights have 3 different color codes too. The GHD keyboards also have 3 different weight zones but only 2 sensors.

Hello Dewster,

I will post higher resolution pictures later but I'm not sure you could read the model numbers.


Effectively there are lots of cables and it is a real pain to change the keyboard.

Ok, here I go again with full res pics of the main boards. Some numbers are readable and others aren't. If there is A LOT of interest I could open again my clavinova and shot better pictures, but for the moment that is what I have:


And another one:

Thanks! I can't make out much other than a couple of Winbond W986432EDH-7 chips, which are 512K x 4 bank x 32 bit SDRAM. Lots of proprietary Yamaha markings.

That big, shiny Yamaha chip looks interesting...

It's probably the newest and most powerful chip - it's a BGA and everything else is ancient looking QFP and TQFP. Someone wake me up for NAMM 2020.

Since I had no reason to I took the top off my Kawai CN33 and took the following two pics:

Overview: it's pretty empty, shows top and back of the keys with a couple of small control panel circuit boards mostly hidden, audio amplifier board, and main (only) board. The (two) speakers point downwards. The shapes of the hammers at the back of the keys change presumably providing different weights:



The main circuit board. Two big Kawai chips (do we still say chips?). I don't know if the other side has components. It's surface mount that's all I recognise:



Not shown is the other speaker and the power transformer. That's it!