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Certain octaves have no sound, keys stuck - Service Manual availa

Older Roland KR 650, been shipped couple of times, unused for years. stuck keys (one per octave), some octaves do not sound. Could use a repair/service manual if there is one to be had.

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  • jgf621 Dec 17, 2008

    I have a Roland 4500s that has many keys that make no sound. I'd like to take it apart to check connections and would love to have a service manual.

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3 Suggested Answers

  • 1137 Answers

SOURCE: need rubber boot key contacts

Try wdgreenhill.com for the parts. They are in England but give great service and specialize in hard to find parts.

Posted on Jul 10, 2009

  • 129 Answers

SOURCE: when I play my Bass

usually If a certain note doesnot play the note before it is not seating correctly. Check all pads that they are sealing behind the bad notes, also make sure the octive key is sealing.

Posted on Feb 11, 2011

  • 5603 Answers

SOURCE: roland fantom g8, problem, The last 2 octaves do

Read page 135 regarding the note range settings. Look also for keyboard split information. You may have the keyboard set to NOT play notes in the top octaves for the particular voice you are using.

Posted on Feb 24, 2011

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I'm having trouble being able to select any of my sounds or switch octaves or keys on my Roland RS-50 it seems as if it's stuck.... What do you think I should do


Will probably need to be diassembled and cleaned. Either a sticking key or a compromised contact on the circuit board. Any electronics repair shop should be able to fix this.

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I've actually repaired two broken hammer keys on my Roland KR-575, after paying $250 (TWICE) for a repairman to come to my house and fix two other keys.
The repair I completed was about four of five years ago. I searched the internet and found great instructions to print out. Unfortunately, I can't find them again. HOWEVER, I did find this video: Roland Keyboard Repair. It shows you the hardest thing about the repair - how to take the cover(s) off to get to the keys! The video is not as detailed as the instructions I used before - but pretty good. The parts cost me about $25.

Unfortunately (for me) I have yet another key to fix now. This time I will take pictures and notes and update here with my results. It might take several weeks though (I'm trying to finish a big school project). In the mean time, try the video. I don't recommend trying super-glue like the video says, but sometimes finding parts is difficult, so I guess that might be an option if you couldn't get the parts easily. I just don't think a weight repaired with super glue will last very long.

Here are a few suggestions to find the parts you will need:
My other advice is to keep careful track of all the different screws you take out - and away from kids, grandkids, and pets - so you can put them back in the right place after your key repair is finished. (The screws that is ;)

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1 Answer

Volume of some keys (one octave) are lower than rest of the keyboard, any advise please ?


Take it in for repair. There may be a broken line for the velocity sensing of that octave of keys that is causing the velocity to be sensed low. The repair is NOT DIY if this is the case.

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1 Answer

Roland fantom g8, problem, The last 2 octaves do not issue sound


Read page 135 regarding the note range settings. Look also for keyboard split information. You may have the keyboard set to NOT play notes in the top octaves for the particular voice you are using.

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We took our roland KR-177 to a roland service center and they said the motherboard was bad and they are no longer available. Where do i find a new motherboard?


The motherboard is probably not available... You haven't mentioned any symptoms of the problem you are having. Some service centers really don't want to be bothered and give up too easily.

Feb 07, 2011 | Roland Music

1 Answer

Im having issues with my roland juno-d. there are 3 keys that are not sounding properly, they are generally quiet and slower to respond. the board and reubber have both been cleaned with alchol


The next step gets very complicated without test equipment.

It is important to realize how these keyboards work. ( I assumed you cleaned the black rubber dot that forms the contact.)

The keys are "scanned" by the electronics. Usually 12 bits are read at a time and the computer scans through the banks of keys that are usually 1 octave at a time and two per bank to enabling reading the velocity as the contacts for a key close one slightly behiund the other.

If there is any deformation of the contact bearing dome, that will cause a velocity sensing problem.

The keys are scanned as a matrix. To avoid current going backward through keys in other octaves, there are disconnect diodes that prevent coupling of one octave with another and between the two sets of contacts (for velocity sensing) within a single octave.

Do verrify that you cleaned the board and the black rubber dots with 99% isoprophyl alcohol and NOT rubbing alcohol as the latter contains an oil that worsens the problem.

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1 Answer

I need a service manual for Roland FP8 piano, or..


Did you ever get hold of an FP-8 service manual? The weight replacement is relatively simple: The case opens by removal of eight screws, four at each end on the underside. The top then hinges up. Keyboard assembly is removed by first unplugging the two white ribbon connectors at the center, then removing the screws at the front edge (underneath) and the screws (gold) at the back of the assembly (accessible from the top). Keys pop out by spreading the two "wings" at the pivot point, and then the weights (Roland calls them "hammers") lift out. Roland will sell you new ones, but I have no idea whether the replacements are any better than the originals. I've done two of these pianos so far, and have a third waiting to be worked on. I do have a service manual, but I think I downloaded it freebee somewhere.
The other failure mode on this piano is the electolytic coupling caps on the output board - I've replaced all of them on both pianos - don't remember the value offhand.
Paul Prestopino presto11@verizon.net

Sep 21, 2009 | Music

1 Answer

Need rubber boot key contacts


Try wdgreenhill.com for the parts. They are in England but give great service and specialize in hard to find parts.

Jul 03, 2009 | Music

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