Question about Roland Amplifiers & Preamps
While playing keys thru my Roland KC 500, amp went out and will not power on
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
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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