Question about Alesis Sr 16 Stereo Drum Machine

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Problem with lights on the drum machine display.

I have a drum machine which is proberbly about 10 or 15 years old but it has just developed a problem. When I hit the power button, the lights on the display come on for a split second but go off again straight away. I have checked the fuses and the transformer and they seem to be OK but there is no power on the output side of the circuit board. The transformer is a 240V in and 24V output and is center tapped. It has 1 black wire which is the center tap wire and 2 yellow wires which are the 12V power. There is power going into the circuit board at the termination of these wires but not on the output side of the board. Output wires are 1 black ground wire and 4 other wires. The first wire is -8V and has power but the next wire is +8V and has no power as well as the other 2 wires which are 5V and 3V respectively.
Does any one know what the problem may be? Like I said earlier, the fuses are OK and I think it might be either the 2 Capacitors or one of the diodes or resistors, but I am just not too sure.
Thanks in advance.

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I had the same problem with my SR-16. It was mfg in 1994 which puts it at about the same age as your machine. When I would turn it on the display would flash on for a split second then go off.
The solution was to change the internal lithium cell.
It has three pins that are connected to the cell which are soldered directly to the main circuit card. As soon as I replaced the cell the unit returned to normal operations. The only thing that did not remain was the user patterns that were previously reprogrammed.
I was able to order the battery from Mouser Electronics. Mfg P/N BR2325-1HG. This is not a difficult replacement, but does require some soldering/de-soldering skills to accomplish. Hope this helps.

Posted on Jul 05, 2009

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I am dealing with the similar situation on this unit. What I did was this (warning: this can mess up your unit):

You are having a power distribution issue. Something has shorted or opened, and temporarly messed up the software. Open the unit, and without going near any power items on the board (i.e avoid op amps, transformers, capacitors, etc), play around by touching some of the low-voltage contacts between the controller chip, the software chip, and the sound chip. Keep rebooting with the on/off switch, and the software has a built-in hard boot for when it goes out of range and eventually it'll boot up nicely. This is also a way to "bend" this unit - I was getting some great sounds and loops while doing this.

The problem I am now expericencing is that none of the pads work. This is not a result from the above explination, but is the same problem. It pads start working when I start jumping, but I have to start jumping closer to the power sources and I'm scared I'm going to fry the unit.

I like the open resistor concept. Can you please elaborate on how to test for your explination with basic home equipment, musicdude? Should I simply start testing all the resistors to see if they are open? I cannot find a service manual anywhere on the internet, only the user manual. Perhaps I can upload an image with what I've discovered.

Posted on Nov 19, 2008


Sr-16 will not load patterns from cassette player does any one know the problem,,
h, sharp

Posted on Oct 23, 2008

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It possibly is an open series resistor feeding the positive tap to all 3 positive regulators, but without specific knowledge of this machine, I can't be sure.

Posted on Aug 07, 2008

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