20 Most Recent Roland KC550 Amp Keyboard Questions & Answers

Hello,

if it does not power up, then it means its having a power problem. it might have worked fine in the past, but that's electronics for you. Power surge, irregular power supply, excess power supply, etc can affect the unit thereby not making it to power on.

This unit must have a power supply board in it where power enters from the mains. A capacitor, fuse, diode, etc may have been defective on the power board and maybe that's why its not making the unit turn on. There might also be some disconnection or something, inside the unit which is not making it to power on.

To actually find out what's wrong, you need to disassemble the unit with a screw driver and check what's wrong. You will be needing a meter in order to test the components on the power board, once you detect any bad component, you can make necessary replacement at any electronics accessories store withing our vicinity. This is the only way by which you can detect the problem.

Of course, testing the power board with a meter will require someone that has the ability. So it you can't, then you might be needing the help of a repairman or you can call a friend that has the ability to help you out.

I wish you the best of luck.

Take care........

If the third prong is the round one, then that is the ground to your amp. It will still work, however, the amplifier will not be properly grounded. So in a pinch you can use it, but you need to get the cable replaced. The ground wire is there for your safety, in case you plug your amp into a mis-wired outlet or if you are plugging in another instrument like a keyboard, mixer etc. that may be mis-wired. This could lead to a bad shock or worse. You have been warned.

Sounds like you have a poor or open ground if the loud noise is 50 or 60 Hertz. If you have the loud noise when the keyboard not connected then the open ground is in the amp. Often times it is only a cold or bad solder connection which you can touch up with a solder iron and some rosin core solder. If the noise disappears when the keyboard is not connected then I would look at the patch cord first and the connectors second. If you have a second amp you can test to cord and keyboard to verify the problem is the keyboard. If you have to touch up the solder connections, unplug and open up the unit. Make sure all connectors or seated and none of them are loose. Use a grounded three prong solder iron and 60/40 rosin core solder. Heat up connections on the connector and add a small bit of solder to each connection. Next heat up the solder connections on the circuit board and quickly add some solder. Caution, do not apply to much heat on the circuit board or the copper trace will lift off the board so you need to use as little heat as possible just to start the solder to flow then let it cool.

Do some tests: Plug a set of headphones into the line outs and tell us which ones if any have sound. Note that only one side of the headphones may have sound and it may be low volume. We need to know if anything is coming fromt he preamp. Makesure the output switch is set to one of the speaker on positions and not just phones.

Hello. Hello. Generally the upper LCD display of bars is an indication that the internal battery is on it's way out and needs to be replaced.
In case you do not have the owner manuals, they can be downloaded from this address - enjoy: http://soundprogramming.net/manuals/Roland_D-20_Manual.pdf

I wonder why the ribbon cables have been replaced as they do not fail. Check the keys actuate the contacts properly.

I can't! In my opinion, no. Start drift boss customize your car by choosing different colors and patterns.

most likely we dont have crystal balls --need to have diagnosed for problem

Yes, you can use the second pedal on a Roland BK-5 keyboard to transpose the key of the music that you are playing up or down by a semitone at a time. To do this, you will need to press and hold the second pedal while playing the keyboard. You can also use the transpose function in the settings menu of the BK-5 to adjust the key of the music that you are playing by a specific number of semitones.

I am also using IOS and Android. So how can I improve some features? The black screen helps you relax when using the computer too much.

Question edited for a bit more clarity. Video that might help https://www.google.com/search?q=Roland+octapad+spd30+dead Owners Manuals only. https://www.google.com/search?q=roland+octapad+spd30+service+manual ..