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Yamaha P105 teardown #2217001
01/19/14 05:43 AM
01/19/14 05:43 AM
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zerox61 Offline OP
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Hey everyone,

I tried to look for a couple of pictures of the P105 guts because I was looking for ways to make it lighted/foldable/shorter so it is easy to take for travels. I didn't seem to find any photos of a teardown so decided to do it myself ;-).

As you might see, there is almost no way to make it foldable as the key assembly is another unit to the chassis. it will be too fidgety to muck around with.

Apart from taking the speakers out, there is nothing really for weight savings. I'll be only using headphones anyway so it's ok without speakers.

Anyway, here are some pics.

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Re: Yamaha P105 teardown [Re: zerox61] #2217002
01/19/14 05:44 AM
01/19/14 05:44 AM
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zerox61 Offline OP
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Last edited by zerox61; 01/19/14 09:49 AM.
Re: Yamaha P105 teardown [Re: zerox61] #2217006
01/19/14 05:54 AM
01/19/14 05:54 AM
Joined: Sep 2007
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Hamamatsu, Japan
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Wow, some great pictures!

dewster's going to love you. wink

James
x


Employed by Kawai Japan, however the opinions I express are my own.
Nord Electro 3 fan & occasional rare groove player.
Re: Yamaha P105 teardown [Re: zerox61] #2217007
01/19/14 05:55 AM
01/19/14 05:55 AM
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Incredible shots. Hope ya can reassemble it . . . If I`m seeing things correctly, the keys don`t have a pivot as such; they bend as in a cantilever action, about the thin section near the end . . .Doesn`t auger well, but I`ve used this action for years without any problem . . . gulp shocked

Last edited by peterws; 01/19/14 01:29 PM.

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Re: Yamaha P105 teardown [Re: zerox61] #2217036
01/19/14 08:41 AM
01/19/14 08:41 AM
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Thanks for pics. How much weight did you save by removing the speakers?

Recently I wondered if it is theoretically possible to cut off a few keys of p-35 and adjust the casing. What you think?


Roland FP-4
Re: Yamaha P105 teardown [Re: zerox61] #2217037
01/19/14 08:41 AM
01/19/14 08:41 AM
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Great pictures.

As I was inspecting the innards it dawned on me, if someone did not like the onboard speakers, how easy would it be to replace the factory installed ones with something bigger (wattage-wise)?


Kawai MP11 : JBL LSR305 : Focusrite 2i4 : Pianoteq Standard

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Re: Yamaha P105 teardown [Re: zerox61] #2217046
01/19/14 09:06 AM
01/19/14 09:06 AM
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Northern NJ
dewster Offline
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Thanks for taking one for the team zerox61! You beat me to it.

Added to the Nekid Pichures thread.

Wow, the keys are really unexpected: switches on the key rather than the hammer, the hammer appears to be somewhat captive - and that funky, funky hinge! Yuck! I suppose we all knew the fulcrum to playing end distance was pretty short, it's quite obvious if you play it.

Tweeters look like they are aimed up into empty space? The fairly cheap looking speakers could be replaced, but they have semi-custom metal frames which could complicate things. The trick would be to find something more efficient with better frequency response in an open baffle setting (but after seeing the keys I'm thinking why bother). I'm moderately curious as to the woofer / tweeter crossover component(s) as this doesn't appear to be captured by the pix. Full range speakers like this don't tend to benefit much from the addition of tweeters, I'm kind of surprised they even bother but I suppose it looks good on the spec sheet.

It's like someone woke up with a severe hangover / radiation poisoning and designed the thing in like 5 minutes.

Re: Yamaha P105 teardown [Re: zerox61] #2217056
01/19/14 09:42 AM
01/19/14 09:42 AM
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zerox61 Offline OP
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yeah, the mini speakers/tweeters are blasting into empty space, there is no box but it is pointing up to the metal grills on the DP.

It is now reassembled and plays exactly the same as before, nothing is broken smile

I didn't end up removing the speakers. I estimate 1kg for the four speakers. A 1kg saving didn't mean too much to me so I left the speakers inside :P.


As for that hinges.. I think I have seen this in my Casio WK3200 and it is the same style as the P105

Last edited by zerox61; 01/19/14 09:51 AM.
Re: Yamaha P105 teardown [Re: dewster] #2217075
01/19/14 11:03 AM
01/19/14 11:03 AM
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Originally Posted by dewster
........the hinge! Yuck! I suppose we all knew the fulcrum to playing end distance was pretty short, it's quite obvious if you play it.

......... Full range speakers like this don't tend to benefit much from the addition of tweeters, I'm kind of surprised they even bother but I suppose it looks good on the spec sheet.

It's like someone woke up with a severe hangover / radiation poisoning and designed the thing in like 5 minutes.


Ha! Dewster, you're an incorrigible but cheerful cynic smile ....or simply a purveyor of the truth?


Roland HP 302 / Samson Graphite 49 / Akai EWI

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Re: Yamaha P105 teardown [Re: zerox61] #2217153
01/19/14 01:53 PM
01/19/14 01:53 PM
Joined: Dec 2009
Posts: 4,675
Northern NJ
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ICs:
- ESMT M12L64164A-7F : 4M x 16 SDRAM
- ESMT M12L128168A-7F : 2M x 16 x 4 SDRAM
- cFeon EN29LV640B-90TIP : 8MB FLASH
- Spansion S29GL128S90TF102 : 16MB NOR FLASH


I believe the cFeon part holds the processor instructions and the Spansion part holds the data (piano, etc.) samples.

For 16 bit stereo, 44.1k sample rate, this gives:

16MB / 2 bytes/sample / 2 stereo samples / 44100 samples/sec = 95 seconds of sample time. /88 = 1.08 seconds per note. To get any kind of realism out of it requires a stretching factor of at least 3x (and indeed there are 29 stretch groups on the P105 : 88/29=3.03).

The Spansion FLASH is at mouser for $2.49 a pop (quantity 1). A company like Yamaha could almost certainly buy these for a dollar or less.

Imagine if Yamaha had sprung $8 (quantity 1 at mouser) for the S29GL01GS10TFI010 1Gb part with 8x the room? ~8 seconds of sample time per note could remove most of the stretching, could relieve much of the horrid looping, and might allow another layer or two. But no, we can't have this because the lowly P105 would then be internally competing with other, higher end, Yamaha DPs (which are similarly hobbled with too-small sample memory).

And I wonder why I'm having trouble getting it up for the DPBSD project lately. It's this same old, same old grind of intentionally inferior products that never ends in this stupid market. Every NAMM is like a smack in the face. Beautiful CFX sample sets butchered down to <16MB (~1/1000 original size).

Re: Yamaha P105 teardown [Re: zerox61] #2217210
01/19/14 03:42 PM
01/19/14 03:42 PM
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I think you may have invalidated your warranty :-o

Re: Yamaha P105 teardown [Re: dewster] #2217217
01/19/14 03:55 PM
01/19/14 03:55 PM
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"Beautiful CFX sample sets butchered down to <16MB (~1/1000 original size)."

Because some of us can`t tell the difference . . . grin


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Re: Yamaha P105 teardown [Re: dewster] #2217272
01/19/14 05:11 PM
01/19/14 05:11 PM
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I guess you had to do a lot of work to get there, but you've at last arrived at a clear conclusion: It's all crap. The high-end goods may stink a bit less, but they all rather stink, eh?
Originally Posted by dewster
It's this same old, same old grind of intentionally inferior products that never ends in this stupid market. Every NAMM is like a smack in the face. Beautiful CFX sample sets butchered down to <16MB (~1/1000 original size).

Re: Yamaha P105 teardown [Re: zerox61] #2217297
01/19/14 05:49 PM
01/19/14 05:49 PM
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Some day I'd like to have an actual digital piano designer/engineer answer these types of questions. As far as we can see they are working with decades old constraints using embarrassing technology, but we don't know all the details of what the reasons for this are, and presumably there are good reasons for all these types of choices.

Re: Yamaha P105 teardown [Re: zerox61] #2217308
01/19/14 06:14 PM
01/19/14 06:14 PM
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I'm guessing that the reasons are marketing related. That is, if people will buy the stuff, they'll keep making it. (The designer/engineer can't speak to that, eh?)

Re: Yamaha P105 teardown [Re: gvfarns] #2217364
01/19/14 08:19 PM
01/19/14 08:19 PM
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Originally Posted by gvfarns
Some day I'd like to have an actual digital piano designer/engineer answer these types of questions.

Same here. Though I wonder how many "actual digital piano desisners/engineers" even exist anymore. The inmates (marketing types) are running the asylum.

Originally Posted by gvfarns
As far as we can see they are working with decades old constraints using embarrassing technology, but we don't know all the details of what the reasons for this are, and presumably there are good reasons for all these types of choices.

Some of it might be that the engineers who have been doing this for decades are slow to change. Another might be that sudden technology upgrades tend to strand inventory.

I think two of the biggest feeders are: (1) old technology is cheap, and (2) there are diminishing returns in larger sample sets, particularly with an uninformed public doing the lion's share of the purchasing. This unfortunately leaves DPs stuck in something of a time warp (cue The Rocky Horror Show).

Re: Yamaha P105 teardown [Re: zerox61] #2217385
01/19/14 09:08 PM
01/19/14 09:08 PM
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St. Louis, MO, USA
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joflah Offline
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Great set of pictures. The gray rubber contacts look a lot like the ones in the VPC1, except two contacts instead of three. I wonder if they're from a common vendor, or if there's just one good way to make them.
Thinking about the tweeter in the middle of the box- maybe it gives some diffusion of the sound, making it less like a point source.


Jack
Re: Yamaha P105 teardown [Re: joflah] #2217412
01/19/14 10:44 PM
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Originally Posted by joflah
I wonder if they're from a common vendor, or if there's just one good way to make them.


I've wondered this too. They always look just the same, regardless of the brand. I'm thinking there's only one easy way to make them and everyone follows the same basic pattern but I don't know.

Re: Yamaha P105 teardown [Re: gvfarns] #2217422
01/19/14 11:14 PM
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Hello, couple of points- questions-
I assume the SDRAM is for the song recorder?
If indeed it is 16mb total (not that memory is everything of course) then my 1998 Korg SG Rack had the same amount pretty much with 15mb for the main piano sample.
(I wonder how much the SP280 uses, or any of the recent Casios)

Also, curious as to how much you think the speakers and amplifiers in this unit cost?

My P95 had a so-so piano sound but probably $6 OEM speakers.

Also, to the OP- before or after you put it together, are you experiencing any of the rattling that occurs at the treble end of the keyboard when playing both hands below middle C?

Looks like the Yamaha I am using for now is the 1.3gb Yamaha U3 from addictive keys!

And it is driven my marketing and how much they can get away with and how naive the consumer is.
I made 2 bad purchases- luckily returned them both


Roland Juno Gi
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Korg SP280
Kawai ES8
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Re: Yamaha P105 teardown [Re: PossumES8Krome61] #2217436
01/20/14 12:30 AM
01/20/14 12:30 AM
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zerox61 Offline OP
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There were two big squishy foam parts on either sides of the "action" assembly when it is assembled to the frame. This prevents the rattling sounds on the ends.

you can see the big foam on the frame in picture #6

Re: Yamaha P105 teardown [Re: zerox61] #2217484
01/20/14 04:39 AM
01/20/14 04:39 AM
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Dunno why there seems to be so much criticism of what is a fine long standing popular piano . . .the speakers will be made to fulfill the function it was designed for; imo they`ll be better than many here think. On my DGX when I turn it up loud, it is loud and powerful sounding. Not at all tinny, and nearly as loud as my previous Clav which had all of 20W per channel from speakers which weren`t much bigger. And it`ll handle the software piano far better than I ever expected. 12W goes a long long way when the designers know what they`re doing. They got it right wi mine. (famous last words . . .)


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Re: Yamaha P105 teardown [Re: peterws] #2217560
01/20/14 10:26 AM
01/20/14 10:26 AM
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Originally Posted by peterws
Dunno why there seems to be so much criticism of what is a fine long standing popular piano
puzzled too.


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Re: Yamaha P105 teardown [Re: zerox61] #2217599
01/20/14 11:46 AM
01/20/14 11:46 AM
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Originally Posted by zerox61
There were two big squishy foam parts on either sides of the "action" assembly when it is assembled to the frame. This prevents the rattling sounds on the ends.

you can see the big foam on the frame in picture #6

thanks, perhaps they added that later? (had one of the earlier models). Mine though might have been casing more in the corner itself of the board or along the top right lengthwise towards the end


Roland Juno Gi
Casio PX-130
Korg Krome 61
Korg SP280
Kawai ES8
Rokit KRK 6 monitors
MXL V67G microphone
Re: Yamaha P105 teardown [Re: joflah] #2217771
01/20/14 05:32 PM
01/20/14 05:32 PM
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Originally Posted by joflah
Thinking about the tweeter in the middle of the box- maybe it gives some diffusion of the sound, making it less like a point source.

As an amateur speaker designer I can say there are a lot of innovative, crazy, whacked-out designs out there, but I've never seen anything like a tweeter in the middle of a box - until these P105 pix. The wavelengths of low frequencies don't "see" the box much (hence the anemic open baffle sound), mids will see it more, highs will reflect and cancel / reinforce in weird ways. Highs really need to breathe free.

And as a P105 owner I can say that it sounds about as good as one might expect. I'm not saying the tweeters aren't doing something, but they would be much more effective mounted flush with the case top.

Re: Yamaha P105 teardown [Re: PossumES8Krome61] #2217774
01/20/14 05:41 PM
01/20/14 05:41 PM
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Originally Posted by Possum SP280Krome
I assume the SDRAM is for the song recorder?

They generally pull the data and instructions from FLASH and stick it in SDRAM so as not to bog down the processor.

Originally Posted by Possum SP280Krome
Also, curious as to how much you think the speakers and amplifiers in this unit cost?

Street value for the woofer is maybe $5 each, for the tweeter maybe $1 each. Amp who knows but probably in the $10 ballpark for stereo.

Originally Posted by Possum SP280Krome
And it is driven my marketing and how much they can get away with and how naive the consumer is.
I made 2 bad purchases- luckily returned them both

I agree. Buying an enthusiast level DP is like looking for gold in a cow pasture.

Re: Yamaha P105 teardown [Re: dewster] #2217823
01/20/14 07:11 PM
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I don't think then despite that they sounded badly- improvement over the P95, but would if they added a little more to get quality like the SP280.

Now, the one thing I did like about the Yamaha's is the placement- you hear sound below and above the piano.

I hope when it comes time for the P-115 they reconsider and up it a bit


Roland Juno Gi
Casio PX-130
Korg Krome 61
Korg SP280
Kawai ES8
Rokit KRK 6 monitors
MXL V67G microphone
Re: Yamaha P105 teardown [Re: zerox61] #2217949
01/21/14 12:46 AM
01/21/14 12:46 AM
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zerox61 Offline OP
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when I bought the P105, I tried a whole bunch of other competing DPs (with and without headphones) and the only other one I thought was good in this range was the Casio PX150.

What I mean to say is that even knowing that the speakers might be cheapy ones, etc, etc, it still won my choice when testing against their competitors!

I'm really interested in the PX150 guts. Maybe someone that is brave and have the time to rip theirs apart and show some pictures :P

Re: Yamaha P105 teardown [Re: zerox61] #2220692
01/25/14 05:41 PM
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Wow. So great pics. Love it.

Thanks for sharing


Long time piano player, with 7 years experience working in restaurants and doing gigs in random places.

My project: Comparison of Portable Digital Pianos under 1000 US$

Owner of Kawai ES100
Re: Yamaha P105 teardown [Re: zerox61] #2221249
01/27/14 04:09 AM
01/27/14 04:09 AM
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Originally Posted by zerox61
when I bought the P105, I tried a whole bunch of other competing DPs (with and without headphones) and the only other one I thought was good in this range was the Casio PX150.

What I mean to say is that even knowing that the speakers might be cheapy ones, etc, etc, it still won my choice when testing against their competitors!

I'm really interested in the PX150 guts. Maybe someone that is brave and have the time to rip theirs apart and show some pictures :P


It`d be interesting to see the Casio action in detail (it is similar in working characteristics). I was surprised that the black keys have a staggered "hinge", which does make them more playable. TBH the innovative use and form of plastics has been the stuff of my generation. It has been put to good use here. And those speakers? They know what they`re doing. Amplifying a piano is no easy business because of the frequencies involved.

Now then. WHO here has the Casio px350? Dive in there, man! We wanna see it stripped!


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

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Re: Yamaha P105 teardown [Re: zerox61] #2221410
01/27/14 11:58 AM
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How do you find the sound of the p105 through monitor speakers vs piano vst's?

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by Chilligirl. 11/12/18 04:44 PM
'Un hiver à Majorque"
by dolce sfogato. 11/12/18 04:33 PM
Same notes on different Clef - D4
by XxKeldecknightxX. 11/12/18 04:31 PM
Need advice on 2017 Seiler ED186 vs 2012 Schimmel C189
by Joe Apisarn. 11/12/18 02:50 PM
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