2017 was our 20th year online!

Welcome to the Piano World Piano Forums
Over 3 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!

Shop our online store for music lovers
SEARCH
Piano Forums & Piano World
(ad)
Wessell Nickel & Gross
PianoForAll
(ad)
Best of Piano Buyer
 Best of Piano Buyer
(ad)
Faust Harrison Pianos
Faust Harrison 100+ Steinway pianos
Who's Online Now
60 members (Burkey, Auraltuner, bobrunyan, BachToTheFuture, 36251, 3B43, 1957, 16 invisible), 404 guests, and 339 robots.
Key: Admin, Global Mod, Mod
(ad)
Estonia Pianos
Estonia Pianos
Previous Thread
Next Thread
Print Thread
Hop To
Page 1 of 2 1 2
NEKID PICHURES!! (Kawai MP10)
#1778344 10/27/11 06:55 PM
Joined: Dec 2009
Posts: 4,675
dewster Offline OP
4000 Post Club Member
OP Offline
4000 Post Club Member
Joined: Dec 2009
Posts: 4,675
NSFW! - You must be 18 or older to view this thread! - NSFW!

Piano World forum member "Jdiggity1" was recently schooled in multiculturalism via a run-in with the wildly different wall voltage "standards" (i.e. hazardous legacy) used in various countries. He was lured into this rocky scenario, nay entrapped, by another charming divergence of said countries, that insidious and overly complex melange of market protection mechanisms and taxation schemes found at the various borders, which tends to jack import retail prices sky high. The full tale of woe is recounted here.

Jdiggity's pain is our gain, however - he took many high quality photos of his Kawai MP10 in the buff after the electrician got it naked (but then had to go home to get his soldering iron, likely story) and posted them at Imageshack so we could all leer and drool together. Let's take a lascivious look!

[Linked Image]
Here is the top of the case flipped over to show the innards. That's the trouble maker (power supply) on the left, the pitch & mod wheels on the right, the front panel display / control printed wiring boards (PWBs) at center, the "brain board" PWB above them at center, and some misc. PWBs at the upper right.

[Linked Image]
The power supply - the big chunk of iron at the fore clearly indicates that this is an older linear design. Upper center is where the IEC power (mains) jack would normally be if it didn't flame out, to the right of that is the power switch, both of which are connected to a fuse and capacitor board on the right. AC then flows to the boat anchor (power transformer), the low voltage windings of which are routed to the board at upper left where rectification, filtering, and regulation occur. Note the big fat gray cable that terminates on the small PWB to the right, this is for the front panel USB thumb drive.

Anyway, say what you will about "wall warts" but the modern switching variety are a lot lighter and more efficient than these older designs, and they normally can handle any voltage found leaking from wall outlets the world 'round.

[Linked Image]
A close-up of the fuse and capacitor board. The usual way to handle multiple insane world voltages here is to play series / parallel games with the power transformer primary windings (bottom connector) along with resizing the fuse amperage rating.

Jdiggity adds: "The three vertical lines to the lower right of the board are the voltage selector things, the middle line is the 120V 'option'. The electrician configured the board to process 240V with a simple solder job involving the far-right line there."

[Linked Image]
The linear regulator board. The large upright chip located at the bottom (behind the big electrolytic cap) is the full wave rectifier. The three regulator chips have no heatsinks, which is interesting. I wonder what that big rectifier and choke are up to?

[Linked Image]
The pitch & mod wheels seem to be using the pot shafts as their main bearings (not the best, but par for the course). The PWBs at center have I/O jacks and stuff on them, and there is a large analog board located above.

[Linked Image]
The large analog board. Many dual op-amps (NE5532N, 45800), several 8-to-1 analog switches (74HC4051), and some random transistors and caps. The center left connector has three stereo audio co-ax wires connected to it - these lead to the volume and line-in faders on the front panel. And there is a strangely empty connector at the upper right. From the high jumper count this looks like a single layer PWB.

[Linked Image]
There certainly are a lot of wiring harnesses in here! The left blue one goes to the LCD display board. There is another small I/O board located beneath the brain board.

[Linked Image]
Mmmm, brains! I see three large proprietary (house marked) QFPs. The two marked "Kawai K022-FP" appear in the MP6, as does the one marked "72030W200FP" (this may be marked "72030K200FP" on the MP6?). The two TSOP II chips marked "M12L2561616A" are 4M x 16 Bit x 4 Banks Synchronous DRAM, and these also reside on the MP6 brain board. In fact, if you look at the MP6 brain board, it seems to be identical to this, with a few minor component population differences. Finally, and apropos of nothing I suppose, a total of 12 screws are employed to hold this smallish board down - that's some serious fastening power!

To be continued... (PW only allows 8 pix/post)

Re: NEKID PICHURES!! (Kawai MP10)
dewster #1778345 10/27/11 06:56 PM
Joined: Dec 2009
Posts: 4,675
dewster Offline OP
4000 Post Club Member
OP Offline
4000 Post Club Member
Joined: Dec 2009
Posts: 4,675
Continued from previous post:

[Linked Image]
The key assembly. Note the slot formed between the center E & F keys, and the green wiring harness.

[Linked Image]
A close-up of the keys, which are individually numbered. I like the way Kawai locates the pivot point farther back for the black keys like real pianos do, which helps to even out the mechanical advantage. The keys appear to be solid wood, with pins and felt lined slots for the pivots. I assume the resting heights can be adjusted via paper washers under the keys at the pins?

[Linked Image]
Side view of the key mechanism, with tape measure to show key pivot locations.

[Linked Image]
The highest key depressed. Let-off feel is provided by a piece of rubber that a prong on the hammer must brush past. The hammer impact cushion is really thick.

[Linked Image]
Close-up of the mechanism. The hammers are plastic with steel weights riveted to the ends. Each hammer has an adjustable jack in contact with the back of the key. An inclined PWB holds the ubiquitous rubber switches which are activated by the hammers. The rubber & prong let-off mechanism is clearer here. Note the highly complex one-piece aluminum extrusion holding everything together - it even forms the hinge for the hammers!

Hats off to Jdiggity for these most excellent nekid pichures!

Re: NEKID PICHURES!! (Kawai MP10)
dewster #1778352 10/27/11 07:13 PM
Joined: Feb 2010
Posts: 1,528
P
1000 Post Club Member
Offline
1000 Post Club Member
P
Joined: Feb 2010
Posts: 1,528
Look at that action! That is exactly why the RM3 is the so impressive. It looks much like a shrunken down acoustic piano action. Thanks for sharing!


Kawai MP7SE w/ GFP-3
Re: NEKID PICHURES!! (Kawai MP10)
dewster #1778402 10/27/11 09:22 PM
Joined: Dec 2009
Posts: 1,722
D
1000 Post Club Member
Offline
1000 Post Club Member
D
Joined: Dec 2009
Posts: 1,722
That action is indeed impressive looks like a real Kawai piano actually.


"I'm still an idiot and I'm still in love" - Blue Sofa - The Plugz 1981 (Tito Larriva)
Disclosure : I am professionally associated with Arturia but my sentiments are my own only.
Re: NEKID PICHURES!! (Kawai MP10)
dewster #1778410 10/27/11 09:36 PM
Joined: Sep 2007
Posts: 16,923
Yikes! 10000 Post Club Member
Offline
Yikes! 10000 Post Club Member
Joined: Sep 2007
Posts: 16,923
Canon EOS 60D - nice camera!


Employed by Kawai Japan, however the opinions I express are my own.
Nord Electro 3 & occasional rare groove player.

"I agree that the User Manual is very good." - arc7urus, March 2019
Re: NEKID PICHURES!! (Kawai MP10)
Kawai James #1778421 10/27/11 09:48 PM
Joined: Oct 2011
Posts: 47
J
Full Member
Offline
Full Member
J
Joined: Oct 2011
Posts: 47
Originally Posted by Kawai James
Canon EOS 60D - nice camera!


I see what you did there!
It's a ripper of a camera.


Current: Kawai MP10, Alesis Q88
Has Been: Yamaha P85
Re: NEKID PICHURES!! (Kawai MP10)
dewster #1778451 10/27/11 10:44 PM
Joined: Sep 2007
Posts: 16,923
Yikes! 10000 Post Club Member
Offline
Yikes! 10000 Post Club Member
Joined: Sep 2007
Posts: 16,923
For those not versed in Aussie:

http://www.word-detective.com/2011/01/28/ripper/

(I'm British, but was raised on a diet of Australian TV soaps, and therefore speak fluent Aussie.)


Employed by Kawai Japan, however the opinions I express are my own.
Nord Electro 3 & occasional rare groove player.

"I agree that the User Manual is very good." - arc7urus, March 2019
Re: NEKID PICHURES!! (Kawai MP10)
dewster #1778459 10/27/11 11:00 PM
Joined: Oct 2010
Posts: 138
E
Full Member
Offline
Full Member
E
Joined: Oct 2010
Posts: 138
Dewster, not a good idea to use a switching regulator in an audio device like this.

Re: NEKID PICHURES!! (Kawai MP10)
Kawai James #1778470 10/27/11 11:25 PM
Joined: Oct 2011
Posts: 47
J
Full Member
Offline
Full Member
J
Joined: Oct 2011
Posts: 47
Originally Posted by Kawai James
For those not versed in Aussie:

http://www.word-detective.com/2011/01/28/ripper/

(I'm British, but was raised on a diet of Australian TV soaps, and therefore speak fluent Aussie.)


I can tell there will be more lessons to come! laugh


Current: Kawai MP10, Alesis Q88
Has Been: Yamaha P85
Re: NEKID PICHURES!! (Kawai MP10)
egallego #1778518 10/28/11 01:13 AM
Joined: Dec 2009
Posts: 4,675
dewster Offline OP
4000 Post Club Member
OP Offline
4000 Post Club Member
Joined: Dec 2009
Posts: 4,675
Originally Posted by egallego
Dewster, not a good idea to use a switching regulator in an audio device like this.

Hmm. I disagree. The switching frequency is usually way outside human hearing. You could have clocks alias down into the audio, but that's always something to consider in a digital audio device.

Re: NEKID PICHURES!! (Kawai MP10)
dewster #1778529 10/28/11 01:41 AM
Joined: Oct 2010
Posts: 138
E
Full Member
Offline
Full Member
E
Joined: Oct 2010
Posts: 138
Originally Posted by dewster
Originally Posted by egallego
Dewster, not a good idea to use a switching regulator in an audio device like this.

Hmm. I disagree. The switching frequency is usually way outside human hearing.

Not always (10Khz in some cases).

Anyways the power quality is way lesser, the web is full of examples, and you know, every hi-fi amplifier uses a linear power supply for a reason. Quick link:

http://www.amb.org/forum/thomass-beta24-build-t1178-20.html#p12536

Re: NEKID PICHURES!! (Kawai MP10)
egallego #1778532 10/28/11 01:44 AM
Joined: Oct 2010
Posts: 138
E
Full Member
Offline
Full Member
E
Joined: Oct 2010
Posts: 138
Of course, without knowing the PSRR of the Kawai circuitry speaking about the power is useless. Other problem with SMPS is the electromagnetic field they generate, etc...

I for one, much prefer a linear power supply for professional audio, unless I have to use different voltages.

Re: NEKID PICHURES!! (Kawai MP10)
dewster #1778555 10/28/11 02:54 AM
Joined: Nov 2009
Posts: 3,616
S
3000 Post Club Member
Offline
3000 Post Club Member
S
Joined: Nov 2009
Posts: 3,616
Nice thread thanks to Dewster and Jdiggity.

Re: NEKID PICHURES!! (Kawai MP10)
egallego #1778583 10/28/11 04:52 AM
Joined: Jan 2009
Posts: 71
J
jve Offline
Full Member
Offline
Full Member
J
Joined: Jan 2009
Posts: 71
Great photos, thanks so much for posting!

Originally Posted by egallego
I for one, much prefer a linear power supply for professional audio, unless I have to use different voltages.

For appliances with lots of exposed analogue circuitry, such as a mixer, I too would consider using a linear power supply. But for a DP, which does all processing in the digital domain and then converts to analogue at the output jack, switch mode supplies are perfectly okay. The analogue circuits in a DP consume so little current it's quite easy to filter the supply lines using passive components (unlike a mixer or power amp).


Re: NEKID PICHURES!! (Kawai MP10)
dewster #1778601 10/28/11 06:51 AM
Joined: Jul 2004
Posts: 6,493
6000 Post Club Member
Offline
6000 Post Club Member
Joined: Jul 2004
Posts: 6,493
Great photos! Thanks for posting.


website | mp3 files | Yamaha AvantGrand N3 | Roland RD 2000 | Sennheiser HD 598 headphones
Re: NEKID PICHURES!! (Kawai MP10)
Kawai James #1778817 10/28/11 01:48 PM
Joined: Aug 2009
Posts: 306
B
Full Member
Offline
Full Member
B
Joined: Aug 2009
Posts: 306
Originally Posted by Kawai James

(I'm British, but was raised on a diet of Australian TV soaps, and therefore speak fluent Aussie.)


I KNEW IT!!!! grin

Re: NEKID PICHURES!! (Kawai MP10)
Kawai James #1778842 10/28/11 02:16 PM
Joined: Nov 2010
Posts: 5,879
A
5000 Post Club Member
Offline
5000 Post Club Member
A
Joined: Nov 2010
Posts: 5,879
Originally Posted by Kawai James
For those not versed in Aussie:

http://www.word-detective.com/2011/01/28/ripper/

(I'm British, but was raised on a diet of Australian TV soaps, and therefore speak fluent Aussie.)


Well, stone the flamin' crows!

Re: NEKID PICHURES!! (Kawai MP10)
dewster #1778854 10/28/11 02:27 PM
Joined: Dec 2009
Posts: 4,110
E
4000 Post Club Member
Offline
4000 Post Club Member
E
Joined: Dec 2009
Posts: 4,110
Rack off you dag...me too...teenage years spent marvelling at Neighbours and the like. I'm sure it was the Aussies that first thought it might be a good idea to paint walls brown. All the sets had brown walls, especially Sons and Daughters.


C. Bechstein Model B | Roland RD-1000 |
Re: NEKID PICHURES!! (Kawai MP10)
dewster #1778875 10/28/11 02:59 PM
Joined: Jul 2007
Posts: 460
Full Member
Offline
Full Member
Joined: Jul 2007
Posts: 460
So is this similar to the action inside an ES6?


- Benton Jackson. Permanent piano novice.
Kawai RX-2 #2555861 in Satin Walnut
Kawai ES6
Re: NEKID PICHURES!! (Kawai MP10)
dewster #1779050 10/28/11 07:22 PM
Joined: Dec 2008
Posts: 78
R
Full Member
Offline
Full Member
R
Joined: Dec 2008
Posts: 78
Do you think there would be enough room to put a Nord Piano sound engine (bain) board inside this? May be it is possible to have a two character piano in one case.

Thanks for sharing smile

Page 1 of 2 1 2

Moderated by  Piano World 

Link Copied to Clipboard
(ad)
Pianoteq
PianoTeq Karsten Collection
(ad)
PianoDisc

PianoDisc
(ad)
Piano Life Saver - Dampp Chaser
Dampp Chaser Piano Life Saver
(ad)
Mason & Hamlin Pianos
What's Hot!!
News from the Piano World
Our October 2020 Free Piano Newsletter is Here!
---------------------
3,000,000+!
------------------
Posting Pictures on the Forums
-------------------
Forums RULES & HELP
-------------------
ADVERTISE on Piano World
New Topics - Multiple Forums
Gospel-Jazz Chord Progression & Scale
by BB666 - 10/30/20 07:33 AM
Guitar Center Mulls Restructuring
by newer player - 10/30/20 12:44 AM
Anthony Hopkins / National Cat Day
by MH1963 - 10/29/20 09:38 PM
Download Sheet Music
Virtual Sheet Music - Classical Sheet Music Downloads
Forum Statistics
Forums41
Topics202,488
Posts3,018,689
Members99,068
Most Online15,252
Mar 21st, 2010
Please Support Our Advertisers


Faust Harrison 100+ Steinways

Dampp Chaser Piano Life Saver

 Best of Piano Buyer

PianoTeq Bechstein
Visit our online store for gifts for music lovers

Virtual Sheet Music - Classical Sheet Music Downloads



 
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 |
| |Contact | Privacy | Legal | About Us | Site Map | Free Newsletter |


copyright 1997 - 2020 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission
Powered by UBB.threads™ PHP Forum Software 7.7.4