Hey folks,
last week i fried my ACEs Toolhead PCB. Today i got my replacement part, put it in, started a new calibraton and nothing happends.
After a few minutes an error message appears.
‘extra_mcu’ unable to connect.
On the PCB the blue light is on always.
Does the new PCB needs software? But how?
I’ve already opened a ticket at Sovol but after one week waiting for parts to arrive i’m unpatiecend and want to Print 
TIA guys
Felix
Update:
Firmware flashed und updated back up to V19. Besides language, I changed nothing but still have the same issues.
Hi,
Are you sure about the wiring of the motherboard?
Maybe I wasn’t precise enough.
I replaced my old PCB with a brand new one ordered from Sovol.
I’m not sure if I maybe fried the wiring too. But webcam, LED, HotEnd Fan and Blue LED on the PCB are working
I have no expirence with the Ace but the Klipad50 used with the 6 and 7 has a “virtual MCU” on the mainboard of the Klipper host board (inside the screen) as well as the MCU on the motherboard that runs the printer. KIAUH will make the firmware for both but you have to “make” the files one at a time.
I dug into the Ace at github a little bit and it seems the same is true for the Ace.
[include mainsail.cfg]
[include timelapse.cfg]
[include moonraker_obico_macros.cfg]
[include MCU_ID.cfg]
[include Macro.cfg]
[mcu]
serial: /dev/ttyS1
restart_method: command
[mcu rpi]
serial: /tmp/klipper_host_mcu
That is the beginning of printer.cfg from Sovol’s github. Note reference to 2 MCU’s.
There is a firmware upgrade guide at https://wiki.sovol3d.com/en/SV06-ACE-image-flashing-tutorial That might get both MCU’s talking.