Piano was making startic, then moving the monitor slider would crack a little more and then sometimes the static would go away. Then the static got worse. Today I turned on the piano which had not been played in 12 months and there is no output at all with headphones or the internal speakers. There is one "pop" that happens a couple of seconds after turning on the piano. I read that the electolytic coupling caps were a problem with this piano and the symptoms of them going bad seemed to match my problem. I would love to get a service manual, but Roland does not even publish that piano model anymore. Can anyone help?
Replacing the electrolytic capacitors in this keyboard would require you to be somewhat experienced in electronic soldering, especially the surface mount electrolytics. You should be able to find how-to videos on YouTube if you are curious. You also probably do not need a service manual. The values of the capacitors should be printed directly on them. Replace them all. Replacements can be ordered from Mouser. BUT, I suggest at least bringing in a friend that has experience with these types of repairs. These circuit boards are not designed for inexperienced soldering!
SOURCE: It's a Roland HP-7e digital piano about three years old.
You may need to clean the contacts which are usually conductive rubber. I explained stuff for another Roland problem with two keys that were intermittent. I have an EP-7 that I had to do the cleaning of the key contacts. Use 91 or 99 % Isoprophyl alcohol to clean BOTH the conductive "pill" (Black under silicone rubber domes) AND the traces on the board where they press. Clean gently as the traces have a hard black coating.
SOURCE: I have a Roland HP 2e digital piano - Foot pedal problem
The ROLAND pianos USUALLY require that you use a normally closed sustain pedal.
MANY pedals are the opposite and close when pressed. SOMETIMES you can open the pedal and reverse the way the switch works.
SOURCE: I have just aquired a Roland E-20 synthesizer
They use pre-programed chips. You will have to use the midi out feature to control another midi capable sound module or midi in to a computer and use the internal sound card.
Testimonial: "Very informative. I will investigate further as my knowledge on MIDI is limited!!! Thanks for your response."
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.
Testimonial: "bur isnt it strange that certain keys have stopped working? ie most the A keys"
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
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Just found out that that the sound process digitaliser may be the problem after finding reading about the same symptoms on the FP-8.
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