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Old 07-24-2012, 06:42 PM
Pbb Pbb is offline
Junior Member
Join Date: Dec 2009
Posts: 3
Default MPA blinking config


My MPA kit doesn't blinking when power-up. It never happened since I have it...

When I try default configuration and the activity led blinking only when I'm sending midi controler message but nothing with the notes.
Also Sysex messages sent doesn't blink...

All the chips are correctly 5 volts powered and the components works so is it the microcontroller that is defect ?

Is it possible to replace it ?

Thank for your help.

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Old 07-27-2012, 02:24 AM
John's Avatar
John John is offline
Join Date: Jan 2009
Posts: 3,007

Hi Pbb,

Yes...if the LED doesn't blink at power-up, either there is a problem with the LED (or with R1), or with the microcontroller.

Did you double-check IC1 to make sure it is not in the socket backward?
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