hey there, i just finished soldering (well, at least i thought so) big genes and it doesnt work as it should… red and green leds are flashing once i connect it to the computer via prog socket and the green one stays on - screen stays black - same happens when i unplug the ksoloti from the big genes hardware and plug it into the computer (macbook air) by itself. the ksoloti app doesnt even recognize it on its own tho “no matching usb devices found.”
i tried different usb plugs
i checked if the pin headers on the ksoloti are properly soldered and if there are any shorts related to those pins (no).
only weird thing that happened while assembling was that there was no resistance between pins 4 and 6 but SW1 and SW2 seemed like they were connected (SD card header). soldering shouldnt be the issue tho, they are not connected because of bad soldering…
hey , just want help out …and curious because Big genes in the mail but have some experience with euxoloti / isn’t it kinda connection problem with firmware reset … maybe not bad soldering !!! try make connection with board only … axolotl forum for info it’s been a while but will follow it up greets and all the luck Reinhard
hello reinhard, thanks for your quick reply! i have tried to start the ksoloti (not connected to big genes) via rescue mode (Rescue Mode - Ksoloti) - the leds didnt light up but still it wasn’t listed in board → select device.
ookay, seems like the solution was to use a usb-c to usb-c cable… didnt like usb-c to usb-a cable… now i only need to find out why the upper 4 pots arent working
Just to confirm, the upper pots (and the CV I/O) would only work if you have Eurorack power +/-12V connected, not if you’re testing via USB power only.
Are you talking about the SD card subboard thing? This doesn’t sound right, in essence it is a short circuit on the 3.3V rail.
Yeah this is correct, as you may have seen on the PCB it says “closed when no card”, i.e. the switch is closed while no card is connected, and connection is broken once a card is inserted. This is how Ksoloti knows a card is present.
Are you talking about the SD card subboard thing? This doesn’t sound right, in essence it is a short circuit on the 3.3V rail.
yes, the sd card thing! i dont know what the problem is tho - the solder points are not connected when measured and they also look okay… any ideas?
Yeah this is correct, as you may have seen on the PCB it says “closed when no card”, i.e. the switch is closed while no card is connected, and connection is broken once a card is inserted. This is how Ksoloti knows a card is present.
ookay new problems: so i tried out the sine oscillator 01 tutorial patch and it looks and sounds like its heavily distorted (still using it powered by usb if that is relevant).
yes, the sd card thing! i dont know what the problem is tho - the solder points are not connected when measured and they also look okay… any ideas?
add: it has already been like that when the SD subboard hasn’t been soldered to the big genes PCB yet, only to the pin header, which i double checked and consequently reheated the solder points to make sure… nothing changed.
Here is the schematic, most of the audio and CV relies on +12/-12 V from the Eurorack rail. It is no use doing measurements if only 5V power is supplied from USB.
The option to supply power via USB (to the Core and digital part) is only for convenience if you want to upload a patch without powering up your whole Eurorack case.
If I understand this correctly, there was a short circuit between VDD and VSS on the SD card board, before you even soldered anything? I guess we need a new SD card board then.
Or does this mean you have a short between 3.3V and GND (i.e. VDD and VSS), only the points you’re measuring happen to be on the SD card header?
Then the short must be anywhere else between pins that have to do with 3.3V and GND, check the Core and Big Genes schematics if you are familiar with electronics, but at least visually check all pins and headers for solder bridges.
So the naked Core without Big Genes boots up and connects? Then the bug might be on the Big Genes PCB. Also check the resistance between 5V rail and GND to be sure.
greets and all the luck Reinhard
