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Boss PS question - ACI-120? (for Roland R-70 Drum Machine)
I've got a Roland R-70 drum machine that came with a generic PS, when
I got it the thing didn't seem to work, so it went back to Roland for a checkout and they fixed some things and said they tested it and it was working fine. I didn't bother sending them the generic PS, I figured they had one. Only when I got it back it acted just the same. The symptoms are a distortion in the audio, whether through the outputs or headphones and the overall output seems to be weak. In true Roland fashion, there are NO SPECS on the case, just "Use a Boss ACI-120 Power Supply". When I got the unit fixed, I also got a manual for it...guess what, no specs there either, only "use a Boss ACI-120 Power Supply". So my questions are twofold: 1. What are the specs on this thing....volts/amps, etc.? One thing I noticed is that it is used to power some fairly powerful things (like a full sized keyboard) so I take it puts out more juice than your garden variety wall-wart. This would make sense given the problems I am having. 2. Anybody have an R-70? Do you HAVE to have this adaptor? Are there other Roland adaptors that will work? It seems the ACI-120 is in plentiful supply, but they are expensive, $50 friggin dollars for a wall wart....but it might be that it's a very high output wallwart. If I at least had the output specs that would be a great help. Thanks, Analogeezer |
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(Mike Rivers) wrote in message news:znr1100560501k@trad...
In article writes: In true Roland fashion, there are NO SPECS on the case, just "Use a Boss ACI-120 Power Supply". Make the phone call. Don't ask "what are the specs of an ACI-120?" ask what your R-70's power requirements are. Give them a story about how your ACI-120 just died and you have to use your R-70 tonight and wondered if you could substitute anything else. Some gear uses an AC wall wart and a full wave rectifier inside to get a bipolar power supply. Those won't work with a DC wall wart. What does the "generic wall wart" that you got with it put out? It seems the ACI-120 is in plentiful supply, but they are expensive, $50 friggin dollars for a wall wart....but it might be that it's a very high output wallwart. It's not unusual for "original equipment" wall warts to be fairly expensive. But for what it's worth, I recently bought some 15V 1A wall warts from Radio Shack that cost $22, but they have a very clean and quiet output, unlike the $10 ones I tried that had about 300 mV of ripple. If I at least had the output specs that would be a great help. It would be more useful to know the power requirements for the R-70. It's rare that you'd need a lot of current if it doesn't have a power amplifier. But it needs to be the right voltage. And distortion and low output level could be indicitive of half of a bipolar operating voltage missing. Well I did wind up calling them, got through right away, Roland phone tech support is much better these days I guess...they had the answer but it's pretty stupid they don't just post the specs on the page where they sell the things. If you go to that page, they have literally FIFTEEN different versions, all are somewhat different. They list which GEAR they are for but nothing about the specs. I guess that is their sutble way of making sure you buy their PS instead of a Rat Shack one. The ACI-120 is 1000 milliwatts (9 volts), kinda large for a wall wart...the PS that came with the R-70 is a Rat Shack one, only 300 milliamps. Turns out the ACI-120 powers some fairly large gear, like the XP-10 synth, the D-5 synth and the TD-8 drum module. These are not power amps but they take a lot more current than a stomp box does. Buried deep in the manual I finally did find a reference (but not on the page that discusses the power supply), the power requirement is 600 milliwatts, so my 300 milliamp supply is providing about half of what it really needs...could explain the slight distortion in the output I suppose. Anyway I'll check with Rat Shack if they have a 1000 milliwatt supply, but I suspect these days they'd much rather sell me a Cell phone. One thing I can say about Roland/Boss PS's....I've got several of them, some around 20 years old and I've never had one go bad...something I can't say about Rat Shack ones. And people wonder why everybody hates wall warts. Analogeezer |
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