PreenFM > preenfm2 and preenfm3

PREENFM3 CONTROL PANEL CONNECTION PROBLEM

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Xavier:
OK It was quick, i had the DFU generator on my laptop, but i cannot try the dfu file.
Let me know if the DFU file here works for you
https://github.com/Ixox/preenfm3/releases/tag/v1.00
Thanks

2 additional things :
. Puting the firmware on the SD card is useless. Only used if you want to flash it again.
. the blue led on the control board only blinks with Midi CLOCK input (not any other midi activity only CLOCK).

odayan:
Thank you for the dfu and the additional comments!

I flashed the unit to the latest firmware with success and went back to the initial failed build state. The activity at the seq button came back.

But this time theres another issue... Sometimes the unit does not start immediately, waits for a few seconds, minutes and then it mostly starts (and sometimes not). This has never happened before.

I sent you the photos and video of the current state by wetransfer to the email preenfm1@gmail.com.

Thank you

Xavier:


I had a look at the video/pictures.

The SEQ button things does not make any sens for the firmware.
So it's a hardware problem.
As if pushing the SEQ button sometimes allow the contact to be good.

The fact the sometimes the preenfm3 takes time to start can also mean that the GND can be wrong and the MCU (STM32) cannot get a clean clock that allows it to start.

Did you solder totally the control board to the main board ?
Would be interesting to see if you have the delay in starting when you turn on without the control board.

Xavier

Xavier

odayan:
I think I found something!!!

Can you confirm that the LOAD goes to the 3rd pin of the processor from below left?? Theres no continuity from that to the LOAD pin of the main board.

Can you also confirm if the via right above the LOAD pin goes to the same pin of the LOAD at the processor? (3rd from left bottom). Theres no continuity on that via.

EDIT: theres continuity from chip to via, but no from via to LOAD pin.

The solder on the processor looks ok as well but this is the only problem that I found. Hope to have it spotted!!!

odayan:
Yes it was LOAD connector and now works perfect!! After hours of headbanging that first crystal clear sound is priceless!!! 🕺😄

Everything works perfect, midi din as well, the only remaining issue is the midi clock light, all lfos arp and seq are set to ext and the unit receives clock (* blinks) but no blue led blinking (neither at startup)😄. What could be the problem?

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