20 Most Recent Roland KC550 Amp Keyboard Questions & Answers


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........

Roland KC550 Amp... | Answered on Feb 11, 2019

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.

Roland KC550 Amp... | Answered on May 14, 2016

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.

Roland KC550 Amp... | Answered on Aug 19, 2011

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.

Roland KC550 Amp... | Answered on May 17, 2011

SPD-SX: Auto Off - Roland - Support - Knowledge Base - Knowledge ...


Auto Off is a feature that shuts down the SPD-SX automatically when it hasn't been used for 4 hours. This can be helpful if you've mistakenly left the SPD-SX's ... Missing: js8 ‎' ‎Must include: ‎js8

Roland Music | Answered on Feb 24, 2019

Open up the Roland G-70 and check if all the connectors and flatcables are well seated. Check also if the power supply is working as supposed to.

Roland Music | Answered on Feb 23, 2019

The wires were probably broken or disconnected during the move.

Roland Music | Answered on Feb 11, 2019

I got this free Pdf manual from an online store for free and I don't think Ive visited a mechanic or fixya for help for more than 3-4 times out of the all the times I fixed the chipper in these 4 years

Roland Music | Answered on Jan 30, 2019

Possible IC chip shorted or failure on the fader board.

Roland Music | Answered on Jan 16, 2019

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