Connected Alesis SR18 with a 9volt supply for 5-10 seconds by mistake, now showing a blue blank screen on start up. How much will this cost me? It isn't under warranty
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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 - ).
Assuming you've tried rebooting the white screen one? If so, You need to take both to a qualified repair man and get the job done right. If you start swapping parts without knowing what works and what doesn't, you risk screwing up the good parts,
Since this unit uses so little power, I would recommend a small stepdown transformer. A 20 or more Watt one is sufficient. DO NOT use a convertor that is intended for appliances like hair driers.
Here is a link... the smallest would work and costs $8... I don't know how they can make them for that. You might consider getting a bigger one if you get other equipment to run as well.
Finding the special power adapter that uses 220 and is compatible to the Alesis would cost much more.
Open the unit and see if it has a battery that holds the settings. Check the voltage... it should be around 3 volts. If less than 2.5 volts replace it.
Verify the INTERNAL regulated power supply as the external you verified with new unit. The external is likely regulated within the D4 and either due to an overload or bad regulator may be below the voltage to run the processor. It is likely 5 volts and anything over 4.85 would be acceptable.
If you have checked that the logic circuits are getting a clean 5 volts DC THEN the power is OK. This requires an oscilloscope AND a voltmeter.
USUALLY when a display shows characters like that it means the processor hasn't initialized the display. Most common problem is too low power supply that doesn't permit the processor to come out of reset.
Bad filter caps can cause the 5 volts to dip below 4.6 volts which would be minimum to operate. A voltmeter might still register near 5 volts but a scope will show the voltage dips.
These will USUALLY stop playing if in a song mode that runs so many cycles and terminates.
The random starts CAN be caused if you have a MIDI input cable connected and ANY device sends a rhythm start command or starts sending rhythm clocks to the unit. You can usually disable receiving commands via MIDI and SHOULD do this unless you are actually using MIDI.
Other things would be electrical transients that could trigger the device. MAKE SURE ALL of your equipment that this is connected to is power from the SAME electrical outlet to avoid ground loops which can also damage your equipment as well as cause intermittent operation.
There has to be a component inside that is faulty. That causes the power supply to quit. If the repairman said it is not able to be repaired it means that the part can't be replaced due to unavailability or the cost. You could try taking it to another repairman at a music store that sells Alesis products if you aren't satisfied with his his answer. SR-16 s are pretty reliable and it takes a lot to damage them to the point where they can't be repaired. If you can't get it repaired locally and you think it can be repaired contact Alesis at http://www.alesis.com/content1024 to find out the closest place to ship it to and get it repaired.
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