Question about Alesis Sr 16 Stereo Drum Machine

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Output section of PCB appears a bit fried as there is no sound output and there is a hint of burnt electronics. Rest of the SR16 works fine. I believe someone reversed the audio cable connections which hurt the SR16. Want to get a schematic or some info on how to fix this.

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This is your best bet:http://www.alesis.com/content1024 It will be hard to find a schematic. Here is another link:http://www.ionet.net/~tslade/sr16.htm

Posted on Aug 27, 2010

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My Peavy XR800F just had all its pots replaced and now iam getting very low output.. any ideas please ?


Output transistors or the preceding driver stages may be failing. Check for electrolytic capacitors for bulging tops, they will have to be replaced.

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Connected alesis sr16 with alesis 110v power supply.to 240v mains...........briefly powered up and then nothing. Have I "fried" the adapter or the sr16?


Look carefully at the adaptor and see if it takes any voltage besides 110 (it will say in very tiny print, you will need a magnifying glass). if it does NOT say 220V or 240V then you friend the adaptor. Get another adaptor - most are "dual" voltage meaning they run in the U.S. or overseas.

Also check for "polarity" (which part of your plug is + or - ).

Jan 24, 2013 | Alesis Sr 16 Stereo Drum Machine

1 Answer

Soil appears to workeaker cno sound output from speaker or headphone output


• Open the unit, and check regulators in the power supply section.

• Could also be from the op amp IC , and coupling capacitors.

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I have an Alesis SR16 drum machine. It fires up ok and you can select a drum pattern, but the output is barely audible. Only by bringing the volume on the machine and the amp right up can you hear anything...


What power adapter do you have on this? This one REQUIRES and AC input, NOT a DC adapter !!! Many people try DC adapters on these because they lose the original and ALL fail. You need a 9VAC at 830ma or more adapter. If you have lost yours, search for "SR16 power adapter" to find replacement.

Apr 27, 2011 | Alesis Sr 16 Stereo Drum Machine

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My behringer pmp3000 has circut board damage(some burnt spots) on the speakon connections board and the amplfiers board. it does not seem to power up(no lights). are these parts repairable or replaceable,...


i own and at this moment have a behringer opened up because of the same problem you have and ill tell you that 6 electronic shops and all the guys at the forum have not successfully fixed these mixers and its not that its difficult its a manufacturing design flaw in the second board at the output A and output B ports inside the mixer.this board which processes power output from the mixer console out to speakers cannot handle the dual 600 watts (1200 total watts) that is running through it and blows the main coils if you replace the coils it will blow when and if you hit a low/high frequency and it usually happens in the middle of a show when you up the bass or the highs which cause the main transformer/resistors to process too many watts to the coils,either the resistors or the coils blow so the guys at the music/electronics forum are exactly correct but you can get the main board for $44.00 at amazon or ebay so you wont have to spend time and money replacing resistors etc

Dec 26, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

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Hello. I am a old tech, so struggle a little bit with this unit. It appears that the 12 volt power relay is not getting any signal, thus the 110 is not connected to the first set of power sections. It...


The relay shorts out two power resistors that limit the input power surge. The circuit is complex a bit. An off-line small switching power supply fires up and "heats up" the rest of the circuit for the main power switcher. I have repaired about four of these. Usually a failure due to arcing in the power amp section fries three transistors there and often a Zener diode. This then wipes out the main +/- 70 volt supply. The two IGBT's are usually blown including the four driver traansistors and the switching regulator chip and another small surface mounted transistor and one or both speedup surface mounted 1N4148's. IF THE fuse had been replaced to try again, often the two power resistors (sand coated ceramic) that ar 10 Watt either 10 or 20 ohms will be blown. Some of the hardest thing is to get the heatsinks loose with the IGBT's. When restarting the supply AFTER repair, one puts about 100 Watt lamp bulb in series with the 120 power input to act as a limiting fuse. You will NOT get far with this without a schematic. You can contact me by direct email fredy2 @ aol.com

Oct 20, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

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Alesis sr16: How do you hook it up??


Come from the main outputs, probably labeled L/mono and R and connect those to your mixer for your audio system on either stereo mix input OR two two inputs that are panned opposite.. DO NOT connect this to a consumer type stereo system as you may blow the speakers or amp. Consumer stuff just isn't able to take output from music equipment such as this UNLESS the volume is kept very low.

May 23, 2010 | Alesis Sr 16 Stereo Drum Machine

1 Answer

Sound output is heavily distorted.


Check following things:

1. The master volume control on the SR16 is at least half way up. Turn down the amp as needed. Running very low output of the SR16 and high amp gain is sure to get distortion.

2. Check power adapter is the original and is producing correct voltage.

3. Check that audio cable is high quality instrument cable and not consumer or speaker cable.

May 05, 2010 | Alesis Sr 16 Stereo Drum Machine

1 Answer

Roland XP 50 head phone problem


Looks like capacitor problem.Check power supply section also.

Mar 07, 2010 | Music

1 Answer

Can you directly hook a sr16 to a peavey bass speaker cabinet using the output mono on the sr16 to send or retrn on the cabinet?


You can, however a bass speaker cabinet will NOT handle the higher pitch sounds needed for cymbals and snares, etc. You would connect it to the return AND doing so would DISABLE the other inputs of the bass speaker cabinet.

If you want both a guitar and drum machine into the cabinet, you need at least a small mixer or a speaker cabinet that can take two channels input simultaneously.

Plugging into the "return" of the cabinet DISCONNECTS the power amp from the preamp section in the cabinet.

Nov 09, 2009 | Alesis Sr 16 Stereo Drum Machine

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