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Need to repair a Roland PSB 13u switching adapter used on a Roland BA330 Amplifier.

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My adapter or plug is broke and i need a new one. last night i used an adapter from the br-800 and it worked except that when i used the cd option the screen would flicker then it would shut off?

Sounds like the adapter for the 800 isn't quite up to delivering the required current, If it is a standard barrel plug type, you should be able to get a low cost replacement from a local electronics store like Jaycar (Australia) or Radio shack (america) to name a few examples. If possible, take the failed adapter from the 900 in with you when you go to get a replacement as this will help the staff get you the right adapter.

Alternatively you could try ordering one from roland, but that would be a much more pricey venture.
Here is the support site for roland products, it will give you an idea of how to go about having your adapter repaired or replaced.

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I need to replace the power push button, but do not know what part number it is. Trying to get it ordered through Mouser, but there are too many listed. All I know is that it's an Alps switch, and it reads...


I've just had a Roland Micro Cube amplifier in for repair and it uses the same type of Alps switch you mention. ( It's also broken )

This is a simple single-pole latching push-button switch, so electrically, almost anything rated for an amp will be good enough.

Alps no longer make the same part, so you'll need to find something which looks the same and fits the original hole.

My repair is easier, because the replacement part doesn't have to match anything.


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The unit is in excellent shape, not used much and has been kept in the oringinal box. I got it out today and the power won't come on? I put brand new batteries in it and still no power. It has been...

Check for corrosion on battery contacts. If this unit can use an AC adapter, often the switch contact in the power plug that connects the batteries when adapter is removed gets bent and fails to connect the batteries.

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