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Roland KC 500 keyboard amp

While playing keys thru my Roland KC 500, amp went out and will not power on

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Grubhead
  • 4946 Answers

SOURCE: roland KC-500 has power but no sound.

You need to determine if the power is getting to the audio amp section. For instance with the volume full up is it humming etc?
As a 'rule' it's unlikely that both left and right channels will fail at the same time (unless you have done something silly with the amp) you are looking for something that is common to both channels. Which is why the power section is first suspect. The exception to the rule (above) is where amps use say an IC power amp for both channels. You will find this IC on the big heat sink. Check whatever is on that anyway for damage or burning.
The only other area could be the pre-amp part. Again this could be a single IC controling both channels, so it's failure could cause a loss of sound. By the way if you can hear music/sound coming through when you put it up to full volume the pre-amp will be generaly good.

Posted on Nov 24, 2009

Grubhead
  • 4946 Answers

SOURCE: Roland KC-550 blows 500ma fuses in power supply

Fuses blow when there is an overload. This is caused by a faulty part in either the power supply (such as transformer or any semi-conductor -diodes, rectifier, IC, transistors etc) or in the main amp stage - anything on the heat sink. The most common cause is a semi-conductor acting like it was just a piece of wire. A cause of an overload alsot is a speaker wire shorting, which blows out the transistors on the heat sink or whatever is on there, they in turn blow the fuse!
Whatever value fuses is put in will blow! The higher the rating however could cause something to get hot thus causing a fire, before they do go!
If the 500ma fuses where the originals marked on the end cap, then stick with them. Often it is writtten on the PC board too.

Posted on May 20, 2010

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1 Answer

Where is the fuse for the roland kc 500????


The fuses are located within the amplifier, you will need to carefully disassemble the amp chassis from the cabinet to access the fuse....

Feb 27, 2015 | Roland KC-550 Keyboard Amplifier

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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...

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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)

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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

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

While playing, my Roland KC-550 will make a loud pop and the sound will stop for a moment. It then starts right back playing. Sounds almost like a short???


Sounds like some solder / component connections have failed
Have a tech check solder joints on the power supply and output amp
I see this on a reg basis

Jun 29, 2010 | Roland MMP-2 2-Channel Amplifier

1 Answer

Roland KC-500 has power but no sound.


You need to determine if the power is getting to the audio amp section. For instance with the volume full up is it humming etc?
As a 'rule' it's unlikely that both left and right channels will fail at the same time (unless you have done something silly with the amp) you are looking for something that is common to both channels. Which is why the power section is first suspect. The exception to the rule (above) is where amps use say an IC power amp for both channels. You will find this IC on the big heat sink. Check whatever is on that anyway for damage or burning.
The only other area could be the pre-amp part. Again this could be a single IC controling both channels, so it's failure could cause a loss of sound. By the way if you can hear music/sound coming through when you put it up to full volume the pre-amp will be generaly good.

Nov 23, 2009 | Roland MMP-2 2-Channel Amplifier

1 Answer

I have a roland keyboard mixing amplifier, KC-550. With an ipod plugged in, its only playing one channel, regardless of which channel I plug into, and the keyboard is also not sounding full. Not sure if...


The KC-550 is a MONAURAL amp and since the Ipod emits STEREO you have to use a special cable to MIX both the left and right from the Ipod into a single, monaural signal.

You can MAKE a cheapy mixer that will serve your purpose by using a series resistor, say 1K from each of the two Ipod output channels to go to the single mono input to the KC-550.

I would build it this way: Find an old IPOD cable or any 1/8 inch stereo cable and seperate the two wires and the shield. In a 1/4 inch plug, connect the shield from the Ipod cable to the shield (barrel sleeve) of the 1/4 inch plug. Connect one lead of each of TWO 1K resistors to the TIP connection of the 1/4 inch plug. Connect each of the two signal leads from the Ipod to the two remaining floating resistor leads. Insulate the splices.

DON'T forget to put the shell for the 1/4 inch plug over the cable before connecting the cable to the 1/4 inch jack. All parts should be readily available at Radio Shack.

I don't know that I have ever seen a suitable ready made mixer cable for this function.

Nov 21, 2009 | Roland Audio Players & Recorders

1 Answer

My sustain pedal does not work on my Roland Juno-D keyboard.


Have you tried the pedal straight into the amp without going thru the Roland?

Does the sustain pedal turn on with the foot pedal or is it a separte stomp switch to turn it on?

May 31, 2009 | Roland Juno-D

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