Question about Roland Boss Dr670 Dr Rhythm W Bass Sounds

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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 sitting in the box for a couple years though.

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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.

Posted on Dec 19, 2010


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These are a nice unit... just bought three of them that were dead... I have repaired one so far. I assume you mean the blue LED is on indicating power is on. What I want you to test is if injecting signal on the BACK of the unit jack (power amp in) will create sound. If it won't then better exercise your warranty. The one unit I have completed repair had a bad 15 volt regulator in it... the second that is almost fixed somebody had blasted the input circuits... probably connected to a speaker output... don't do it... these are LINE and MIC level units. If you need to tap off a speaker output, use a DI box with the unit. The third unit I have not received yet. Drummer used the repaired one as monitor last night and was impressed with the power this unit has.

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There is NO POLARITY to worry about since you MUST use an adapter that supplies 9 volts AC at around 850ma. You CANNOT use a DC adapter with this unit and have it work. Putting a DC adapter of 9 volts on it won't damage it, it just won't work.

AC output adapters are harder to find.

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Hi , Just purchased an HD400 today . When powered up there is no menu screen available only black character blocks ?????

This sounds like a power supply problem. SInce the unit is brand new, exercise your warranty immediately. Don't mess with it and risk voiding the warranty.
If YOU supplied the power adapter, that is LIKELY the problem. This unit take one that is capable of 3 amps. (2.5 amps minimum) Most pedal adapters will NOT work with this unit as they don't have adequate current output.

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I was playing my Orange Crush 20LDX that I just bought today and when I first plugged it in I could smell burning but I thought it wasn't that serious. After a while of playing, the amp still had power...

Since this is a brand new amp right out of the box, I would recommend returning it immediately to the dealer you bought it from. If it can't be repaired under warranty they might replace it with a new one.

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I was playing my Orange Crush 20LDX that I just bought today and when I first plugged it in I could smell burning but I thought it wasn't that serious. After a while of playing, the amp still had power...

Unfortunately, the correct action here is to return the unit for a replacement one. Any attempt to repair this will void the warranty. Since you just purchased this today, the store should not give you any trouble and just exchange the unit. If you need to, insist on an exchange rather than waste time on a warranty repair.

Good luck,


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Peavey escort

I would try unplugging some of the extras. All of that could have been causing your line voltage to sag too low for the mixer supply to operate properly.

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