Messages

1

preenfm2 and preenfm3 / Re: preenFM2 DIY-Kit: dark display / not booting / no usb-connection

« on: December 08, 2020, 04:20:23 PM »

On a whim, i replaced the USB-stick packaged with the DIY-Kit with an older one, reflashed 2.20 just to be on the safe side and guess what: the whole thing works now.

Thank you very much for your support!

2

preenfm2 and preenfm3 / Re: preenFM2 DIY-Kit: dark display / not booting / no usb-connection

« on: December 08, 2020, 02:07:10 PM »

And turned up ?

When you say it receives midi, you see the number 1-4 on the display with midi activity ?

Have you tried holding down MENU and pressing one of the 5 left buttons. It should make a note with a note icon on the screen ?

I tried your suggestions and the display showed it acordingly, but the audio is still dead. I'll send you a PM with pictures.

3

preenfm2 and preenfm3 / Re: preenFM2 DIY-Kit: dark display / not booting / no usb-connection

« on: December 08, 2020, 09:02:58 AM »

Number of voices for the instrument is different from 0 ?

Yes.

The volume pot is in in place and soldered ?

Yes.

Sure you flashed 2.20 and not 2.12 ? you need 2.20 with the new PCB.

Yes, i used the latest release from here.

You see "24 bits DAC" at the bottom of the boot screen ?

Yes.

Bootloader is 1.13.
For the firmware i tried both 2.20 and 2.20_cv.

2.20 is the one you need.
"cv" is control voltage for the Eurorack version.

I reverted the Firmware back to the non-cv 2.20.

4

preenfm2 and preenfm3 / Re: preenFM2 DIY-Kit: dark display / not booting / no usb-connection

« on: December 07, 2020, 11:35:15 PM »

Alright, i managed to flash the synth. Some useful links, because Windows 10 threw a mean curve ball while i tried to flash the pfm2:

(1) https://www.youtube.com/watch?v=AeaglOYphfc
(2) https://zadig.akeo.ie
(3) https://www.hanselman.com/blog/how-to-fix-dfuutil-stm-winusb-zadig-bootloaders-and-other-firmware-flashing-issues-on-windows
(4) http://dfu-util.sourceforge.net/releases/

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The Preenfm is now up and running (including the display), but i can't hear anything. Not startup-jingle and not played notes. It does receive midi via USB on all 4 channels.

Bootloader is 1.13.
For the firmware i tried both 2.20 and 2.20_cv.

5

preenfm2 and preenfm3 / Re: preenFM2 DIY-Kit: dark display / not booting / no usb-connection

« on: December 07, 2020, 07:28:34 PM »

Did you set the boot jumper before trying to flash the bootlosder? How are you trying to flash it? I had no joy via a browser and used the dfu toolset... (I also have several stlinks so that is a possibility)

Ah, yes, i shortened the boot-jumper and powered the device on, as described on this page. However, both the browser-tool and DfuSe couldn't see the device. At this point, i didn't bother to try any CLI-tools.

6

preenfm2 and preenfm3 / [solved] preenFM2 DIY-Kit: dark display / not booting / no usb-connection

« on: December 07, 2020, 07:11:06 PM »

Hello and greetings!

I ordered a kit from TubeOhm and happily began soldering. I'm by no means a pro nor very experienced. It's quite possible, that i did one or more blunders while putting it together. However, i double checked the solderings and i'm at a loss for what to do next.

The usual data:

PCB: Rev 6.2 - 10/2020
OLED-Shield: https://www.raystar-optronics.com/oled-character-display-module/20x4-oled-display.html

USB-Stick: Intenso Micro Line 4GB @Fat32
Stick-Contents: please see the attached screenshots

Further symptoms:

I powered it via USB, the little 3,3v LED lightens up and i can hear a power "click" on the lineout while (de)powering the unit as well as some hissing (Jumper default/0 Ohm) and way less hissing (Jumper at 22 Ohm). The internal type A USB-Port was measured at 5V. It completely fails to register as a USB-Device of any kind (midi, filesystem, dfu-device) in Windows.

I can provide some high-detail-photos, if necessary.

Any help would be greatly aprecciated.

thx1138