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Topics - alaszlo

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preenfm2 and preenfm3 / Final Build Question & Display Issue[Update]
« on: December 30, 2019, 12:46:10 AM »
I just finished my Preenfm2 build with the metal case from Van Daal, and I have to say, much props to Xavier for designing such an intuitive synth! This is a 2-part post, the first part regarding my build quality and the second regarding an OLED display issue.

1. I noticed that, after screwing everything together on the metal case, there is a fairly significant bend at the top of the faceplate close to the screen. I would assume this is because of the plexi screen protector (Attached shows the case screwed slightly tighter than finger tight). Has anyone noticed this on their builds as well? I just want to make sure that I'm not putting too much pressure on the OLED after tightening everything.

2. After powering on the device, it boots up correctly (2.10) and the display remains on indefinitely if I don't press or turn anything (I timed this past ~2 minutes and then gave up). However, after I start pressing the various buttons and turning the encoders, the display turns off but I can still receive audio whenever this occurs. Every time the display turns off and I select 'Menu', a bunch of gibberish characters appear on the screen. Apart from that, some of the menus cause the OLED characters to flicker (notably the 'OP()' & 'Settings' menus). The rate in which the display turns off seems to be tied to how quickly I cycle between the different menus. 'OP()' & 'Settings' appear to be the main culprits as the display will shut off more quickly after pressing those. There are other random instances I noticed that have caused the display to turn off including: the display turns off immediately (uncommon), pressing only one button that isn't one of the two previously mentioned, and turning only the encoders.

Note:
  • I'm powering the Preen via USB and the display behavior is consistent whether it's plugged into the computer or a USB wall adapter.
  • My computer doesn't recognize the Preen as an external device when plugging into the computer (not sure if that's normal behavior).
  • I removed the DC input in order to properly fit the case (likely not tied to the display issue if I had to guess).
  • I have JMP1 & JMP2 connected but left JMP3 open.

Any ideas? I can also upload any photos of the PCB if need be as well.

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