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My roland electric piano makes a humming sound instead of music when turned on

Roland kr 4500

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 1137 Answers

SOURCE: Roland KR-5500 digital piano

Unless you are skilled at electronics troubleshooting, you would probably be better off taking it in to be repaired. It might be the power transformer or a filter capacitor or a number of other things. The problem may not even be visible. You will definitely need a schematic and some test equipment. Try this site:http://www.vintageplanet.nl/ or this site:http://www.rangeraudio.com/stock16.htm

Posted on Oct 18, 2009

  • 5603 Answers

SOURCE: I have a Roland HP 101 digital piano however certain dont sound

White spirit is NOT what you should use. Mineral spirit leaves a residue film.

Use 99% isoprophyl alcohol.

ALSO inspect the contactboard for cracks by candeling with bright light behind it.

Posted on Nov 01, 2009

Testimonial: "bur isnt it strange that certain keys have stopped working? ie most the A keys"

Prestopick
  • 1 Answer

SOURCE: 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

Posted on Nov 19, 2009

  • 5603 Answers

SOURCE: How do I remove the keys from a Roland KR 4700

If these are semi weighted keys here is a cut and paste from a manual:
19. Disassembling the Keyboard Assembly
* After inserting a round stick (Rod: TX000670)
between the frame and the keys, remove the
circuit boards. (Fig. 23)
19-1 GHD EBUS L, MK SUB Circuit Board
(Time required: about 12 minutes)
Remove the seven (7) screws marked [260A]. The
GHD EBUS L and MK SUB circuit boards can then
be removed. (Fig. 24, Photo 5)
19-2 GHD M Circuit Board
(Time required: about 12 minutes)
Remove the five (5) screws marked [260B] and the
screw marked [262]. The GHD M circuit board can
then be removed. (Fig. 24)
19-3 GHD H Circuit Board
(Time required: about 12 minutes)
Remove the four (4) screws marked [260C] and the
screw marked [262]. The GHD H circuit board can
then be removed. (Fig. 24)
* Keys can be removed without removing the
circuit boards.
* After removing the GHD EBUS L, GHD M and
GHD H circuit boards, and the rubber contacts
can then be removed.
19-4 Rubber contact
Remove the GHD circuit board for the involved key.
The rubber contacts can then be removed.

The rod is inserted above the weighted hammer and the bottom of the keys from one end. It appears to be about 1/4 inch diameter dowel and will run the full length of the keyboard. You might use 3 foot ones from each end.

Screws are removed and the boards removed without taking the individual keys out.

Posted on Mar 17, 2010

Testimonial: "Thank you for taking the time to help. Can't wait to get it fixed, thanks to your helpful information. I really appreciate it."

  • 74 Answers

SOURCE: roland hp550g digital piano has a couple of dropped keys

Power off the unit. Disconnect all cables that plug into the speaker base if you have one - It may be wise to document the individual wires to make their reinstallation easier. Remove the unit from the speaker stand and lay it on the floor on something like an old towel - you may get some dark colored grease on the rug. Remove the screws only for the bottom rear, not the front - you don't need to remove them. Do this by gently turning the unit upside down. Only remove the screws from the sides/rear bottom, and note which screw types you removed from where. Once all bottom rear screws are removed gently return the unit right side up. now pivot the top rear cover - the sides of the cover are attached to the rear - pivot it toward the back. No need to remove the ribbon cables - just let the top lay there or prop it up with something if the ribbon cables don't have enough slack for the top cover to lay flat on its back. You should now be looking at all of the keys uncovered. notice the rear of each key is where it hinges. You'll notice the grease at the hinge point. The keys are thin plastic so you must take care not to damage them. The way to remove a key is to spread the ears at the hinge point of the key you want to remove. I use a screwdriver sharpened to a point, but a large pair of needle nose pliers work good too. You insert the tapered point of the tool between the ears gently to spread them far enough to just clear the pins. Once they are spread wide enough you'll feel them disengage. Each key also has two hooks located side by side towards the front of the key on the bottom side - they are not visable until the hinge is released, but you must realise they are there or you'll either snap the key back onto the hinge or not be able to pull the key out once you've got it off the hinge. Pivot the key towards you to remove it. What you now have in your hand is not the defective part. You have the top that is touched when playing the keyboard. The defective part is still setting in the mechanism. What's actually happened is the keys are made of very thin plastic where they are glued around the weight and this plastic breaks leaving the weighted end down there somewhere. Examine where the key top came from and how it works. The key top is the part you took off of the hinge. You can see how the keys on each side work and you'll also see what is missing from the mechanism for the key you're working on. To make things easier I always remove one additional key top on each side of a key that I repair to make access easier. Just place the other keys you remove right behind the key area in the order you took them off so it'll be obvious how they go back on. Now the broken weighted mechanism you can lift right out. Actually you can lift it out easier with the weighted end broken off, but once you glue it back together you can still get it in there without to much trouble. You only need to remove the damaged weighted mechanism for the key you're repairing. I remove the key tops on each side of the damaged key for visability only. Take your pair of needle nose pliers and pick out the broken end. Now fit it onto the end of the weighted mechanism in preparation for glueing - just so you can see how it's going to go on there. I use a high quality modeling super glue. Before I came across this glue I used JB Weld, but it takes a few hours to dry. The high quality super glue allows you to put everything back together immediately. Installation is reverse of removal: Snake the weighted mechanism back in once you've repaired it - you can always examine those on each side if you get confused. Hook the key top front first then smoothly snap in place the hinge ears over the pins. Make sure to check the movement of the repaired key, and check also to see if anymore keys are setting lower as they may be in process of breaking off. Once all keys are repaired, carefull lower the top rear cover onto the key assembly. While holding the cover onto the key assembly/base, gently turn the unit over onto its back and reinstall the screws. Should be all washer headed screws - do not over tighten. Check the keys again. Set the keyboard onto its base (if it came with one) and you're done. A little practice and it'll take you less than a half hour to fix the key and get it back together

Posted on Sep 23, 2010

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