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#3127443 06/13/21 02:08 PM
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I have decided to buy Yamaha dgx 670, but I am a bit worried about reliability. I have seen quite a few videos which showed clunky noises being made be keyboards with this (GHS) action like p45 or p125.

I understand that mileage can vary but for how long with a moderate home use can I expect this action to work without those annoying clunky noises? Are we talking about weeks, months or years? I would appreciate if someone who has P124, 45 or any other yamaha with GHS action to share their experience in that matter. I just don't want to replace my cheap little noisy casio with something that is 5 times more expensive just to be disappointed after couple of months.

Last edited by witor; 06/13/21 02:08 PM.
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I’ve had mine for a couple years w/o issue. That said, it doesn’t get more than an hour or two of play time a week. I play my acoustic piano a lot more.

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Three issues, here:

(a) Reliability = does it work, over the long run?

There are a gazillion GHS actions in service, and most of them work quite well. And keep working -- it's an old, proven design. I _think_ there's a plastic hinge, and once in a while it breaks, and the key needs to be replaced.

(b) Action Noise -- if you read this forum, you'll find reports of action noise for _every brand_ of DP. This has to do with the mechanical design, and the quality of the felt used.

(c) If your Casio is one-fifth the cost of a GHS Yamaha, it's probably a spring-loaded (= "synth action") keyboard. The Yamaha GHS is a fully-weighted (= "hammer action") keyboard:

. . . _that's_ why its so much more expensive (and IMHO, worth its cost).

You can get fully-weighted actions in Casio DP's, if you want to stick with that brand. But (of course) some people complain about the noise in those, when you release a key.

By and large, if you run the DP at a realistic sound level, you won't be bothered by key-return noise. If you set the volume control low, so as not to disturb others, you might hear the key noise --

. . . but in that case, you should be using headphones.


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Thank you for the replies.

i don't have a brand preference. It took me a while to decide between Casio PXS3000 and Yamaha dgx 670. I chose yamahe because it has a much more user friendly interface (prefer dedicated buttons than multi level menus requiring multiple touches to achieve something) and in general just few more features. I am quite happy with Yamaha's action and amount of noise the key bed makes when new. I just want it to stay close to that level without developing plastiky or clunking noises.
By the way I have Casio ctx 700 at the moment and lots of key are making plastic on plastic noise. I am planning to re grease it and will see what happens.

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Please don't be lured in by user interfaces. The most important "interface" manifests itself in the form of 88 keys. All else is fluff ... best ignored.

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My p-125 with GHS started having the kinds of problems you were referring to about 1 1/2 years after I got it. Loud clicking or scratching sounds, keys getting stuck. Otherwise, I really liked the action.
I would check if there is a Yamaha approved service center near you. You usually get a 2 year warranty. I had my keys fixed and all seems well for now.

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I've had loads of DGXs without issue over many years. They do get a bit noisy after a few years but I never noticed until the wife brought it to my attention when i played fast heavy passages. You'll have loads of fun on the DGX. Good choice!
Pity about the stand; you have to pay fot it now!


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I just ordered a Yamaha P121 which has the GHS action. I too was a little concerened with some reports of clunky keys (which seems common for low to mid priced actions) but was encouraged by a video that tells you how to home repair (re-lube and swap keys about) and it looked pretty easy to do.

I like the idea of fixing things myself and have replaced rubber contacts on keyboards in the past myself without any problems.

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i would'n mind re-greasing once in a while, but I have spent quite a bit of time searching what grease should be used and I still have not found one. Thanks for the video

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I've used grease supplied by Yamaha, part number AAX90710. Yamaha in California will give you a small vial for free if you order parts from them and ask for some grease.
If not, this grease gets expensive. The 1 pound tub costs $150. Not sure what the small AAX90710 vial would cost.

You might also try white lithium grease from Lucas Oil. I've used it to smooth out the "action" on computer keyboards. It worked well.
It's only $5 for a half-pound tube from Home Depot or Lowes. That's enough to lube your piano every year for approximately forever.

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Wasn't there someone here recently who was absolutely certain that the GHS was destined to catastrophic physical failure due to the design of its hinge?

I think like most digital actions, the GHS does develop some noise after a while, mainly due to compression of the foam damping strips. It really depends on how much and how heavily you play it.

But it stays serviceable and consistent for quite a long time, there's a reason Yamaha has been using it for decades.


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I have one DGX, and the action is good... not good enough for advanced repertoire, but good enough for practice baroque and classical repertoire, some Chopin nocturnes... I find it very light, but not as fast as the GH. Compared to my acoustic and to my college's steinways, it is very very light. But quite dependable and reliable. I had a p-105 for a few years and my keys were heavily used without getting clunky. I find that keyboards that travel a lot get clunky easier wereas when they stay on one place for quite sometime it doesn't get that much clunky unless you pound the keys very hard... but then again, even acoustic pianos can suffer if pounded on a daily basis.


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I played the crap out of my p105. Used it as a public piano in my store for a year or so. And then subsequently sold it to a church dude .

It’s still going to this day according to him

Not the best action in terms of feel but it gets the job done.

Yamaha is top notch for longevity though .


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Originally Posted by Gombessa
Wasn't there someone here recently who was absolutely certain that the GHS was destined to catastrophic physical failure due to the design of its hinge?

Yes, jeffcat. His reasoning didn't convince me (or anyone else at the time from what I can remember). I don't think there's any reason to expect more problems with the GHS than any other action.

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for what it worth, my P80 is 20 years old and I never had to open it. My battered P120 only required little fixing and it working like new. Yamaha's are rugged and reliable

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Originally Posted by Nigo
for what it worth, my P80 is 20 years old and I never had to open it. My battered P120 only required little fixing and it working like new. Yamaha's are rugged and reliable

Neither of thosepianos utilise GHS to my knowledge. . . .


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