How do I open my Yamaha P150?

by cb
(NL)

My speakers are acting up (crackle) and I suspect dust might be part of the cause.
How do I open up the top? I've unplugged it, unscrewed the screws in the back, and I see some hinges as if it could open..
but it's not moving, yet... Does anyone have a service manual or some other tips?

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Jun 12, 2015
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Help: P150 speakers ok, but no sound
by: Oldnewpiano

hi... i found this site and i would be so happy if my cry for help does not just vanish in the past of the internet (its 2015 now). someone gave my a yamaha p150 for free, it has a defect. the speakers are ok, becuase when u use it with a cdplayer etc, it works. but if you push the keys - nothing. he had it opened up and he said he couldnt see any lose cable or rust or something displaced, but he doenst have much knowledge.
before i open it up (and i dont have much knowledge too) i am looking for ideas what it could be.

if i fail, its ok, it was for free :-) the people in the shop wont repair it because its too old.

help me i would be grateful for the next 20 years...

cheers

Mar 10, 2012
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Great instructions
by: MarcieM

I had two keys sticking together on my Yamaha Electric Piano 150.

Followed the simple instructions (take out four screws on the bottom on each corner) and open up the lid. I found some debris stuck between the keys and cleaned it up.

Now it works great! Thanks

Feb 12, 2011
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question about keys not playing
by: Anonymous

i have two keys that don't play at all no matter what mode it's in and even after I reset everything to factory setting. I had three that didn't play but one came back after I messed with the split voices thingie. (this is a new old keyboard to me).

any suggestions would be greatly appreciated.

and i'm sure one is "buy a new keyboard" so we'll just take that one under advisement for now. :)


thanks and best,

maggie

Jun 02, 2010
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Mak's question
by: Anonymous

Dear Mak,

feasibilty depends on the cost.... a good P150 is not without value, they do between 600 (used) and 900 euros (mint) here in Holland. They're wnated by a slecetde group of pianists for key action and samples.

As it is built like a tank, I guess that the problems may not be too big, even could be fixed by yourself if you have some skills... Keys may be stuck somwhere in the mechanism, just look and see and either the contactstrip is defective (can be replaced easily) or something is stuck between the key mechanism and the contact strip.

Opening it is easy and can be done safe as long as you take care of the cables inside (open gently and see)... Unscrew the 4 screw at the corners and the 1 underneath the phones jack and gently swivel the cover til about 90 degrees (opens like a bonnet). A visual inspection of mechanics and keystrip may shed some light on things... Disassembly of the keyfram is not difficult either, but mind the cables! Having this done and replacing the strops may set you back around 200 euros (overhere) I geuss...

Good luck!




May 30, 2010
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yamha p150
by: mATMAN

Hi- Thanks for all your comments, took my Keyboard AND PARTS to Watson Electronics near Brisbane , they refitted the key in double quick time for a very reasonable fee.
regards Matman

May 28, 2010
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repair or not p-150
by: mak

I have a Yamaha P-150 that I am reluctant to part with. It needs repair and I don't know if it is worth it to repair, or if it is just too old. Some of the keys click when you play it and 2 of the keys seemed to play at a higher volume. I just don't know if it is worth the money to get it fixed and if it is not, any suggestions on what to do with the keyboard?

help if you can!

Dec 20, 2009
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Yamaha P 150 Key Replacement
by: Alfred

Dear Matman: The name is Alfred, but that's not important. What is important is that you seem to have solved your problem, THANKS TO CORIEN. It shows how well this Forum can work! Good luck in your continued repair, and thanks for the message.

Dec 20, 2009
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broken p150 key
by: Matman

ps , thanks for your advice Albert. I`ll check out the keyboard a little more and see if I can locate the `combs`
cheers .

Dec 20, 2009
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broken p150 key
by: Matman

hi Matman here, I have opened the p150 and found the white key in question has broken at the front. I called the guy in the usa I bought the unit from s/h 3 years ago, - I am in Aust - and he send me one of his spares, all I have to do now is take my time and figure out how to fit it.

Sep 28, 2009
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Defective Key P 150
by: Alfred

Dear Matman; I am always loath to suggest opening any keyboard because of the possibility of "add-on" damages which might be inflicted. However, in your case, 1) After opening your unit as described by Corien.You should be able to see
"combs" (sets) of keys, one of which will include the defective key. Remove whatever fasteners are securing that comb and note the number of keys it includes. 2) You should google Yamaha's Parts Dept. to check if they have the corresponding comb. BE SURE YOU IDENTIFY THE COMB WHICH INCLUDES THE BAD KEY. Reverse the procedure to reassemble your keyboard. Good luck.

Sep 28, 2009
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yamaha p15o keyboard
by: matman

Hi , I have a yamaha p150 keyboard, one of the white keys is loose. that is to say if you put your finger on the front edge it will lift up almost
vertically. - the key still functions properly but i think perhaps the white key had broken or lost a clip which holds it down securely, any ideas, thanks.

Sep 18, 2009
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Opening the Yamaha P 150
by: Alfred

Dear Corien: Damn chauvinist that I am! I apologize for my gaff. I'm truly embarrassed as I did think the name was unusual. I thank you for helping all of us learn through your experience, and hope your keyboard gives you continued pleasure (and of course the satisfaction of getting it to work). Regards.

Sep 18, 2009
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Problem solved
by: CB / Corien

You indeed have to be a little careful when you open the Yamaha P150.
(To open you only need to unscrew the screws underneath at both sides)
It hinges open, but there are some electrical wires that you don't want to overstretch, so go slow - a 90 degree angle should be fine though; at least it was for me).
I vacuumed inside but there was very little dust - Yamaha did a great job of making it dust proof. Speakers so far are fine though... and oh - I'm female by the way ;)

Sep 18, 2009
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Opening the P150
by: Anonymous

For those of you WHO HAVE THE SAME UNIT, CB (Corien) has informed me that he has successfully opened and cleaned it.
He's happy now and has told me the process involved unfastening additional screws to access the innards. If the speakers of your unit "crackle' and if you are handy,and suspect it's just dirt, you might consider CAREFULLY opening your P150 to do likewise. Be careful not to damage the cones of the speakers as you clean. I must caution you to be mindful that if it's not the speakers, close up the keyboard and think about the many other causes for speaker crackle. Definitely consult a professsional for help.

Sep 15, 2009
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Opening the Yamaha P150
by: Alfred

Dear CB: "Huzza" !! Go for it now that we seem to see eye-to-eye. I can now say (without offending you) that I consider a unit ready to risk opening when it passes the 10 to 12 year mark. Now let's see if we can get down to business. First describe your unit. Is it a Keyboard type or a "furniture" type with wood legs and some kind of panel covering between them? You realize I'm trying to perform a long distance diagnosis, WITHOUT ANY MANUAL TO GUIDE US. Before we go further, I would say DO NOT FORCE ANYTHING. Look at the edge opposite the "hinges" to see if there are any screws. If not, it's possible that the housing may be held by some kind of locking lip or lips which have to be pressed towards the "hinges" for release. If
you succeed in opening the "housing", get a soft brush and a can of compresed air to clean out the speakers. Watch you do not damage the paper cones. After you've cleaned the speakers, and the sound is still "crackling" the problem may be
a) "Soured" electrolytic capacitor[s] b)Dirty key contacts [blow out with air between the keys]. If these suggestions do not clear up the problem, start saving for your next keyboard. Finally, if you feel I can be of more assistance, contact me at almac1020@yahoo.com

Sep 15, 2009
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Thanks - how do I open it?
by: CB

Thanks! But I'd still like to try and open/clean it myself.
If my dust removal plan doesn't work I'll probably live with the crackle until the piano really dies on me... Pretty sure I got it in 93 or 94 too.
Just thought it would be worth a try, it's been in a very dusty environment for a while (and the cat likes to sleep on top...) so if it's dust it could be an easy fix, if it's something else, I'll very likely leave it and start saving :( Pretty fond of my P150 though, so I hope it'll last for quite a while to go.

Sep 15, 2009
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Opening P 150
by: Alfred

Dear CB: 1) You may be right re the speaker problem. But what if it's because there's another reason, say a "noisey Resistor or Capacitor? Do you have the tools, test equipment and savvy to effect a repair? 2) A Service Manual is likely to be a waste of money if you
are "flying by intuition" !! 3) Your unit was released in 1992. Weigh the intrinsic value you place on it. Find out if the cost of repair by a professional is feasible. When you've considered my comments,you can decide whether to wait for others in this Forum to be of help. Good luck.

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