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My roland discover 5 wont tune - not to default 440Hz or any others - wont stabilize - and the bottom corner of touchscreen where it says"440 -Do it" for resseting to default concert pitch dowant work/ respond- and I havent been able to find a schematic( Besides playing, I'm also an Electronic tech- if had schematic could fix myself- Lee

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  • Roland Master
  • 5,603 Answers

The unit may have the problem that befalls the Palm Pilots where something gets under the escutcheon and presses on the touch screen at the edge which overrides any other inputs.

Another possibility is a stuck button. The buttons are usually scanned as a matrix and at startup if a button is stuck that can make unit unresponsive.

Without a logic analyzer and the firmware listing you likely would not get far if one of the logic chips has gone bad unless it can be found using freeze mist and heat gun..

Stuck buttons or touch screen is usually easily found without schematic.

Posted on Apr 28, 2010

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