Question about Alesis Sr 16 Stereo Drum Machine

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Blank display no functions power ok

Blank display except a line of squares at the top, no functions power ok

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Fred Yearian

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Not sure what you mean by "power OK",

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.

Posted on Jan 13, 2010

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