Introduction: How to Repair Sticking Keys of Digital Piano

Picture of How to Repair Sticking Keys of Digital Piano

I have a roland Ep 9 digital piano and the problem was the keys were very hard to press whenever i started playing and there was a clicking noise while pressing them. These keys use grease to be played smoothly, so i decided to repair it and share it with you because I have heard that sharing is caring......
I hope i could do the justice to teach you how to disassemble and repair in detail.

Step 1: Unscrew the Back Cover of the Keyboard

Picture of Unscrew the Back Cover of the Keyboard

Unscrew all the screws from the back side of the keyboard an keep all the screws in a bowl or something you find is safe for screws as you will need them while re-assembling.

Step 2: Lift the Cover Like This

Picture of Lift the Cover Like This

Step 3: Now Unscrew the Highlighted Screw on Both Sides

Picture of Now Unscrew the Highlighted Screw on Both Sides

Unscrew these screws on both sides and pull the Blind gently.

Step 4: Remove the Strips Carefully

Picture of Remove the Strips Carefully

Gently pull one end of the strip at a time and then second and remember the position of the strip ends.

Step 5: Unscrew the Keyboard

Picture of Unscrew the Keyboard

keyboard means here is not the piano itself it is the board where the keys are attached. This part can be separated as follows from the entire piano.

Step 6: Gently Push the Lock of the Keyboard With Your Thumb

Picture of Gently Push the Lock of the Keyboard With Your Thumb

Step 7: Unscrew the Pcb

Picture of Unscrew the Pcb

unscrew the pcb and lift the rubber switches and chassis

Step 8: Remove the Key Stopper

Picture of Remove the Key Stopper

there is a key stopper which has no screws but it uses double coated tape. Just remove it as in the image. And while reassembling use double coated tape and press it hard.

Step 9: Remove the Spring of the Keys

Picture of Remove the Spring of the Keys

Carefully remove the springs of the keys as shown in the image use a tweezer to hold the spring and keep them in a secure box or whatever you find is safe so you don't lose it.

Step 10: Disassemble the Keys

Picture of Disassemble the Keys

Now Disassemble a white key and as shown in the image you will see old and sticky grease there which causes the trouble of clicking noise and hard to press keys. Remove the old grease with Isopropyl alcohol swabs which i used and apply new grease to make them work smoothly.

Step 11: Reassemble Every Thing

After applying the grease reassemble every thing from end to start and enjoy smooth piano playing.
I hope you will like it.


ZeroG3 (author)2017-11-24

Thanks for this guide!

I just got an old Roland ep-9e digital piano. It sounds great.

But one key (A2) plays much louder than all other keys, as if it's registering a much higher touch velocity than it should.

Do I need to fully disassemble as you show or is there a shortcut to address on key? I'm afraid of causing more problems.

Sparky347 (author)ZeroG32017-12-12

I have an EP-7 that had half it's keys not working at all. Followed this guide to disassembling the keyboard and although the keys are held in place by a slightly different mechanism, it's pretty close. I took every key off, cleaned the contacts on the PCB and the small rubber pads, and then used an HB2 pencil to draw on the rubber pads to add graphite so they make contact better. After partial reassembly, I found one key was louder than the others. I had to remove that key, clean and re-seat the rubber pad so that the upper contact (you'll see 2 rubber contacts on the rubber pad per key, the upper one that protrudes farther on the rubber pad is responsible for the softer volume) touched the PCB before the lower contact when the key is pushed.
Keyboard is working 100% now, but the only way to fix the velocity/ sound issue is by completely disassembling.

sstrom61 (author)2017-03-27

Hi m_waqas,

I recently bought an ep9. I have 8 keys that do absolutely nothing when played. Any thoughts on repair?

m_waqas (author)sstrom612017-04-16

sorry for delay in reply

tell me the detail of keys, I mean send me pics of the keys which don't make any sound so that I can figure it out.

sstrom61 (author)m_waqas2017-04-16

Hi, Thanks for responding. I (emboldened by your post) opened my keyboard and saw the problem was some erosion on the key contact board. I saw a company here in the states sold the same key contact circuit board. I bought the one they had and replaced my faulty one.

Now all those keys work, but all the ones that correspond to that new circuit board play at full velocity no matter how I hard or soft play the keys. At this point, I have no idea what I am doing.

m_waqas (author)sstrom612017-04-18

this problem occurs when the strips of the contact board are not installed properly try to re-install them on the main board, I hope it will resolve the problem of touch response, because the velocity sensor's circuit has some obstructions and you could also try to clean the strip's ends as well and try to install them thoroughly, and then tell if the problem resolves or not

mayi3 (author)2017-01-16

hi m_waqas,

thanks for your nice tutorial.

I've recently repaired the sticking keys of my EP-9.

However unfortunately something has caused some corrosion on a small area of the piano's mainboard.

So at this area the blue capacitor and a SMD resistor fell off the mainboard.

While the capacitor was still lying around the little resistor has disappeared untraceable.

The blue capacitor was located at position C15, the missing resistor at position R12 on the mainboard.

I asked Roland support for the circuit schematics but they are not very helpful.

They are not willing to hand it out.

Instead they advised me to bring the keyboard to a local dealer for a (very likely very expensive) repair. What i find very ridiculous, especially when you consider the age worth of the keyboard.

Anyway, i'm stuck here.

so maybe, if not asked to much: could you eventually check the mainboard of your piano and tell me what number is printed on the small resistor at location R12?

So i can buy and solder a replacement resistor.

Many thanks in advance :)

PS: i've uploaded an image of the concerning area of the mainboard. The parts R12 and C15 are located inside the red circle

m_waqas (author)mayi32017-01-19

i would love to help you but not here my email address is

send me mail and then i'll tell you what to do

mayi3 (author)m_waqas2017-01-30

thank you very much :)

i will send you an email soon

stebinus (author)2016-09-15

nice tutorial. i want to try this on an ep 7. the key weight glue melted in hot weather over a few yrs in storage and many weights dislodged and blocked keys. any hints on what i can use non toxic to get that glue out? I tried grain alcohol but barely dented it. Can you also recommend a non toxic glue to put them back with? thankx

mayi3 (author)stebinus2017-01-16

hi stebinus,

i don't know if your question is still alive.

Here is what i did for removing the red glue:
Dissolve approximately
300 grams of washing soda (sodium carbonate) on 4 liter of very hot water. Within a couple of hours the
epoxy begins to transform into a non sticking jelly-like consistence.
Now the weights (those that haven't fallen out already) can be removed
easily. Bear in mind that the hotter the solution is the easier the
weights will come out.
Then you should let the weights and keys soak
in the solution over night. After that the epoxy leftovers can easily be
removed from the keys and weights.

There is
one important thing that you should bear in mind: DON'T soak the keys
and weights in some kind of soap solution until you have removed the
"jellyfied glue".
In my first test with a few keys i had put the parts in a dishwasher detergent solution before removing the "jelliyfied" epoxy.
turned out that the detergent somehow transformed the jelly-like epoxy
into a stiff and hard consistence which was more difficult to scrape

After removing of the red glue and cleaning the keys i used simple silicone to stick the weights back in.

stebinus (author)mayi32017-01-18

thank you very much!

m_waqas (author)stebinus2016-09-22

thanks for nice comment, and IF you detach all the keys and put them into hot water to let the glue melt on itself and clean the weights, after that (for reassembling) you can use any Polychloroprene Adhesive for the weights to stick back, I am not sure about the toxicity of the glue but I use gloves, glasses and be a lot more careful while using these kind of adhesives, and wash my hands, you can ask some carpenter or technician or better a doctor about the toxic effects before using it, I hope it helps.

Rolandfix (author)2016-09-15

My grandkids pounded my Roland HP 1000s piano and now two keys will not depress. Do I need to take the entire piano apart from the bottom? Or is there an easier way to open the top and unstick the two keys?

m_waqas (author)Rolandfix2016-09-23

sorry I don't know about your digital piano because I never repaired it.

Aung ShweM (author)2016-07-08

let me know the name and type of the grease for the keys. thx.

m_waqas (author)Aung ShweM2016-07-09

GraceH28 (author)2016-02-27

Hello. Great instructions and photos! Could you tell me what kind of double sided tape you used? Where did you get it? I would appreciate any advice about that. Also, I heard that some people think Krytox teflon lubricant. Could you tell me the exact lubricant you used? Thanks!

m_waqas (author)GraceH282016-03-23

thanks for your comment and the double sided tape I used is available at stationery store where I live but, I think you can get it from Walmart, search "Scotch-Double-Sided-Office-Tape", and the lubricant is grease which is available on hardware shops,

I hope you find this info useful. take care and best of luck.

Murphyvermont (author)2015-06-04

awesome instructions! Thank you soooo much I have it apart and keys put back together cross my fingers I get it all back together but great instructions thanks for taking the time to do that

m_waqas (author)Murphyvermont2015-08-09

Thank you very much Murphyvermont

RobertP13 (author)2015-02-22

Mohammad, thanks for the magnificent guide for restoring a Roland EP-9 keyboard. I have the exact model from a family member who gave up on trying to get it working again. Overall it appears in very good condition but most of the keys are hopelessly stuck. Many will not even make any sound. Do you think cleaning the keys has a good chance of success to return the instrument to a usable state ? Or are there likely to be more issues with the electrical switches that would still render it worthless even if I got the keys unstuck ?

Thanks again for such a nice write-up. It has given me hope that I might be able to save the keyboard.

m_waqas (author)RobertP132015-02-28

Thanks for this honor Robert. If some of the keys are not making any sound you have to clean the rubber pads located beneath the keys. And the sticky keys are the big problem and there are other reasons for the stuck keys which are not mentioned in this tutorial and i am gonna tell you about that. I am giving an image below where keys can also stick with the carpet area. Take a close look on the highlighted area in the image. And try to scratch the dirt and sticky gum from that area. I hope it helps.

RobertP13 (author)m_waqas2015-02-28

Thanks very much for the additional information. Now I only have to get up the courage to launch into the project.

ikeyegros (author)2015-01-01

Mine is a Roland KR 575. After a strong hit (made by a 1 year old boy), one black key lost its normal position (see image). Is the way you show on this page I need to follow to fix it again? Thank you for your help. Ike

m_waqas (author)ikeyegros2015-01-16

sorry for delay and i think the black key you indicted has lost its spring, if you look at my tutorial closely you would see keys are lifted by springs to their normal positions, the spring may be broken or it has to be re-attached.

Awesome, it's always great when you can fix things yourself!

thank you very much for your nice comment

comics_kis (author)2014-05-24

what type of grease do you use? Please tell me

m_waqas (author)comics_kis2014-06-14

mechanical grease which is used in bearings.

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