Question about Roland KC550 Amp Keyboard

Open Question

Roland KC 550 keyboard amp, power light is on but no sound

My amp stopped working. When I turn it on, the blue standby light comes on, so the power connection is intact, i think. However, there is no sound at all, no matter what channel I plug into or how high i set the volume. I'm figuring it's a blown fuse, so I am currently trying to disassemble the amp, but I'm having trouble with that too, there doesn't seem to be any seams in the upholstered wood that encases the amp and speaker. Any help would be appreciated.

Posted by on

4 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

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 1137 Answers

SOURCE: Roland keyboard. Extremely static-y speakers. Cuts out.

It sounds like your volume slider is dirty. Try carefully and judiciously spraying a good quality contact cleaner into the slider and working it. do not use a lot. It only takes a little. Also do not use WD40.

Posted on Apr 23, 2009

  • 5603 Answers

SOURCE: roland juno d not pikkingup volume but very low

Check if headphone output is normal... sometimes the headphone jack switch fails and doesn't send to speakers when headphones are unplugged.

Posted on Oct 20, 2010

walesarumi
  • 6993 Answers

SOURCE: My Roland kc 550 will not power on.

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........

Posted on Mar 22, 2011

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Only humming or buzzing , no music or sound


Try different cables. That would be the most simple and cheapest fix.

May 27, 2014 | Roland Kc-150 65-watt Keyboard Amplifier...

1 Answer

My amp becomes distorted when I turn my keyboard up. Both the Master Volume and the CH1 volume knobs are in the middle(12 o'clock). How do I keep my amp from distorting?


You left off the one bit of info we need... however, make sure the volume control on the keyboard is around the halfway point... If it is way down, turn it up and reduce the channel volume knob some. Make sure the cable from the keyboard is an instrument rated interconnect and not one intended for speaker (usually marked as such). Make sure the keyboard AND this amp are powered from the SAME receptacle... even if you have to run an extension cord. Listen with headphones on your keyboard to make sure the sound is clean there.

Sep 01, 2011 | Roland Elektronische Musikinstrumente...

1 Answer

Hi , I,m Itali , sorry for my English , but I'have a problem with KC-350 ( similar KC-550) The general Gain it's not responding. The output signal is very very low and very noisy. Thank for...


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.

Aug 19, 2011 | Roland KC550 Amp Keyboard

1 Answer

There is a power, but no sound at all.


When you turn it on does the speaker thump or make a hissing sound? If so then the speakers are ok. If there is notany sound, you must measure the speakers to make sure there is continunity.
If you need further help you can send it to Pro Line Music.215-736-8055

Jul 15, 2011 | Roland Kc150 Kc 150 Keyboard Amp Demo Unit...

1 Answer

I need the schematics for the Roland CK-60 amp or the wire diagram.


This MIGHT be close to your unit... it is for the KC-100... they often use the same circuitry.

http://elektrotanya.com/roland_kc-100.pdf/download.html

Scroll down to the "Get Manual" and click on it to download. There may be slight variations but these amps are simple enough to troubleshoot. USE the old trick of putting an incandescent lamp of say 100 watts in series with the power input to act as resetable fuse and save fuses when powering up after a repair.

Apr 29, 2011 | Roland KC60 (40W 10 3Ch Keyboard Amp)

1 Answer

I have a very loud hiss/buzz sound coming from my Roland. It goes away if I lower the high volume knob. This just starred to happen recently. I tried changing connections from ch1-4 but no fix.


If this ties to a keyboard, make sure the keyboard and this are BOTH plugged into the same receptacle. You should send a higher level from the keyboard (turn volume up to around 70% or so) and use less volume at the input gain of this amp. Use more at master volume if the amp has one if needed. If the hiss is there with NO input cables plugged in and input gains at 50%, that is objectionable, the amp probably needs servicing. Unused channel gains should be clear down.

Apr 11, 2011 | Roland Elektronische Musikinstrumente...

1 Answer

My Roland kc 550 will not power on.


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........

Mar 21, 2011 | Roland KC550 Amp Keyboard

1 Answer

I have a roland kc 150 65w amp that begins humming the moment i turn it on. its a normal low frequency hum. nothing is plugged into it, and when i ajust the volume knobs it does not effect the sound. How...


First thing is to determine if sound is from the speaker or possibly the cabinet. If from the cabinet it is likely the power transformer is vibrating the chassis. This sometimes can be cured by adjusting the mounting bolts.
If the sound is from the speaker, then an electronic "cure" is needed. Please note that a very quiet hum is normal but if you can hear it 5 foot away, that is un-normal.

The hum would probably be due to failing component in the power supply. Unles you are adept at electronic repair, best to take it in for servicing.

Feb 25, 2011 | Roland Kc-150 65-watt Keyboard Amplifier...

1 Answer

My roland kc-60 has a hum but i cant get any sound but that


Does the hum exist with no cable plugged in? If so, take in for service. If there is no hum with cable out, then try new cable and/or musical instrument be it guitar or keyboard as the problem is likely in those.

Nov 22, 2010 | Roland Kc60

1 Answer

HI My Rowland Kc60 suddenly has no power. I presume it is shorted out...can I replace the fuse myself, and if so - where and what fuse do I buy and how do I access it on the amp?


Here is a link to the manual:http://lib.roland.co.jp/support/en/manuals/res/1811247/KC-60_e2.pdf Page 9 states that there is a protection circuit built into the power supply. Follow the directions for turning the power on in the manual. If the amp doesn't power up you will have to have it serviced by a qualified Roland tech as there is likely to be some damaged circuitry that won't be repairable without the schematic, parts and safe repair procedures.

Oct 18, 2010 | Roland Kc60

Not finding what you are looking for?
Roland KC550 Amp Keyboard Logo

Related Topics:

66 people viewed this question

Ask a Question

Usually answered in minutes!

Top Roland Music Experts

Vito Vacirca Jr.

Level 2 Expert

140 Answers

Rabbit Brains
Rabbit Brains

Level 3 Expert

575 Answers

Matthew Spark
Matthew Spark

Level 3 Expert

1066 Answers

Are you a Roland Music Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...