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#1811463 - 12/23/11 09:42 PM Re: DPs Exposed! [Re: vegasE]  
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Originally Posted by vegasE
Originally Posted by Kawai James
vegasE, may I ask where you found that image?

It appears to reference an older keyboard action, and may therefore not be applicable to the latest 'RM3 Grand' action.

Kind regards,
James
x


http://www.francepianos.com/granex/kawai_mp10.htm

I found it strange that the image was named "awazones" as well. Thats why i ended my post asking whether it was correct.
The funny thing was, i came across it searching for the CA51 - not the MP10. Sort of makes sense given the image file name.

In the past few weeks i have been testing some new DP's. I have found a MP10 and a MP8ii in a store sitting side by side. The actions did feel similarly weighted (not definative by any means) but the biggest difference i felt was the left-off mechanism of the MP10.

I have also been interested in the differences between the actions - AWA ProII and RM3.




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

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#1811465 - 12/23/11 09:45 PM Re: DPs Exposed! [Re: dewster]  
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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.

#1819906 - 01/06/12 08:57 PM Re: DPs Exposed! [Re: dewster]  
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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

#1831606 - 01/25/12 02:51 PM Re: DPs Exposed! [Re: dewster]  
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Anyone seen CP300 pics? I want to open mine. I'm generally very handy, but I always prefer to use instructions if available.


Playing since age 21 (September 2010) and loving it more every day.
"You can play better than BachMach2." - Mark_C
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#1870918 - 03/30/12 10:44 AM Re: DPs Exposed! [Re: dewster]  
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Just added a link on first post to this thread for Lawrence's Yamaha AG N3 key regulation post.

#1871214 - 03/30/12 10:06 PM Re: DPs Exposed! [Re: dewster]  
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Employed by Kawai Japan, however the opinions I express are my own.
Nord Electro 3 fan & occasional rare groove player.
#1872407 - 04/02/12 08:50 AM Re: DPs Exposed! [Re: Kawai James]  
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Originally Posted by Kawai James

*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!

#1872415 - 04/02/12 09:14 AM Re: DPs Exposed! [Re: dewster]  
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Any further analysis on the Nord Stage 2?


Employed by Kawai Japan, however the opinions I express are my own.
Nord Electro 3 fan & occasional rare groove player.
#1872516 - 04/02/12 12:11 PM Re: DPs Exposed! [Re: dewster]  
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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.


AG N2 | CP4 | SSv3 | GK MK & MP
#1872680 - 04/02/12 04:37 PM Re: DPs Exposed! [Re: Kawai James]  
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Originally Posted by Kawai James
Any further analysis on the Nord Stage 2?

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?

#1874522 - 04/06/12 06:49 AM Re: DPs Exposed! [Re: dewster]  
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Hello,

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

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)
[Linked Image]


This seems the main board with yamaha DSPs:
[Linked Image]

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:
[Linked Image]

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

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):
[Linked Image]

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

And last, a sideways view of the keys:
[Linked Image]

Last edited by Carlos-CR; 04/06/12 06:50 AM. Reason: (right and left confusion :( )
#1874545 - 04/06/12 07:46 AM Re: DPs Exposed! [Re: dewster]  
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GH3 doesn't mean there are three different weighting groups, it means there are three sensors for each key.

#1874580 - 04/06/12 09:30 AM Re: DPs Exposed! [Re: Carlos-CR]  
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Originally Posted by Carlos-CR
I'm new to the forums, and wanted to start by showing some CVP-305 intimate pictures smile

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.

#1874585 - 04/06/12 09:44 AM Re: DPs Exposed! [Re: EssBrace]  
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Originally Posted by EssBrace
GH3 doesn't mean there are three different weighting groups, it means there are three sensors for each key.


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.

#1874588 - 04/06/12 09:48 AM Re: DPs Exposed! [Re: dewster]  
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Originally Posted by dewster
Originally Posted by Carlos-CR
I'm new to the forums, and wanted to start by showing some CVP-305 intimate pictures smile

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 Dewster,

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


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

#1874715 - 04/06/12 02:59 PM Re: DPs Exposed! [Re: Carlos-CR]  
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Originally Posted by Carlos-CR
Originally Posted by dewster
Originally Posted by Carlos-CR
I'm new to the forums, and wanted to start by showing some CVP-305 intimate pictures smile

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 Dewster,

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


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:
[Linked Image]

And another one:
[Linked Image]

#1875254 - 04/07/12 05:33 PM Re: DPs Exposed! [Re: Carlos-CR]  
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Originally Posted by Carlos-CR
Ok, here I go again with full res pics of the main boards. Some numbers are readable and others aren't.

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.

#1875317 - 04/07/12 08:31 PM Re: DPs Exposed! [Re: dewster]  
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That big, shiny Yamaha chip looks interesting...


Employed by Kawai Japan, however the opinions I express are my own.
Nord Electro 3 fan & occasional rare groove player.
#1875361 - 04/07/12 11:00 PM Re: DPs Exposed! [Re: Kawai James]  
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Originally Posted by Kawai James
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.

#1878015 - 04/12/12 06:17 AM Re: DPs Exposed! [Re: dewster]  
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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:
[Linked Image]


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:
[Linked Image]


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


Last edited by spanishbuddha; 04/12/12 06:20 AM.
#2035151 - 02/18/13 09:21 AM Re: DPs Exposed! [Re: dewster]  
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Hello.
My GEM RP90 was broken, I repaired it and took some photos.
Here's one, with the main electronic boards:

[Linked Image]

More photos here - http://www.pianoworld.com/forum/ubbthreads.php/topics/2035147.html#Post2035147



Michael / GEM RP90 / SX-P50
#2036424 - 02/20/13 02:06 PM Re: DPs Exposed! [Re: dewster]  
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I would love to see pics of old FP4 naked action? Anyone feeling frisky?


AG N2 | CP4 | SSv3 | GK MK & MP
#2050872 - 03/19/13 02:18 PM Re: DPs Exposed! [Re: spanishbuddha]  
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Originally Posted by spanishbuddha
Since I had no reason to I took the top off my Kawai CN33 and took the following two pics:

Added to the OP list, thanks spanishbuddha!

#2050882 - 03/19/13 02:31 PM Re: DPs Exposed! [Re: dewster]  
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Great to see, it shows that Yamaha uses its own components!


If the piano is the King of instruments then I am its loyal servant.
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#2264870 - 04/21/14 08:49 AM Re: DPs Exposed! [Re: dewster]  
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Why does Kawai keep on being so thrifty for the distance between the fulcrum and key surface?
All they do is put a catchy marketing term to its graded hammer technology excluding more information about the balance pins.

#2264882 - 04/21/14 09:17 AM Re: DPs Exposed! [Re: dewster]  
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All we`re short of now are pics of the lesser Roland actions; like Ivory "G", and that other Alpha one . .


"I am not a man. I am a free number"

"[Linked Image]"
#2380119 - 01/30/15 06:02 PM Re: DPs Exposed! - Kawai MP7 Lot 142 [Re: dewster]  
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During a repair session with the service technician I could sneak in and make some quick photos with my mobile phone. The quality of the photos is not as good as I would have hoped for.

Interesting for me, who did some DIY repairs on an old Roland RD-500:
The MP7 does not have a hinge on the case to open the top like a bonnet.
THe RD-500 could do that and it was very useful when doing repairs.

There is also a photo of the slightly humming transformer.
Looks like we have a chance with rubber washers...

So far I did not manage to include photos from DropBox inside this post using the [img]-tag.
View the photos inside a DropBox-folder:
DropBox File Folder with Photos: MP7-inside-Edwin

Photos via 666kb.com:
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]

Last edited by lophiomys; 01/30/15 06:16 PM.
#2380159 - 01/30/15 07:45 PM Re: DPs Exposed! - Kawai MP7 Lot 142 [Re: dewster]  
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Good pictures Lo Phi. Your humming transformer is a Bando KT-32. The humming transformer in the CA95 is a Bando KT-33. I suspect these are specially made by Bando for Kawai and "KT" stands for "Kawai Transformer".

I'm a bit surprised that the transformer appears to be screwed directly into the metal casing, with no insulation. The CA95 does have insulated screws, but it's insufficient and requires extra silicone washers to eliminate the transmission of vibrations to the casing, which causes the audible hum.

Did the extra washers solve the problem for you?


Kawai CA95 / Steinberg UR22 / Sony MDR-7506 / Pianoteq Stage + Grotrian / Galaxy Vintage D
In the loft: Roland FP3 / Tannoy Reveal Active / K&M 18810
#2380167 - 01/30/15 08:28 PM Re: DPs Exposed! - Kawai MP7 Lot 142 [Re: dewster]  
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I could not fit the washers yet, as the service technician only agreed to do the warranty repair on the modulation wheel and nothing else. I will give the device some more time under the official warranty. I'll report back with more photos, if I will get around to fit rubber washers myself.

#2606396 - 01/20/17 09:29 AM Re: DPs Exposed! - Kawai MP7 Lot 142 [Re: dewster]  
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Hello
great pictures

Do you remember how the mp7 had been disassemblated ? first the rear side ? which screws ...

need to see if the power or fused of mine are out .

thanks


"la vie c'est comme une dent ..." Boris Vian
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