# Mcu problem / printer not ready **URL:** \ **Category:** General Discussion\ **Created:** [January 19, 2022, 10:19pm UTC](https://klipper.discourse.group/t/mcu-problem-printer-not-ready/1825 "2022-01-19T22:19:00Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![a0562894](https://avatars.discourse-cdn.com/v4/letter/a/b5a626/32.png) [@a0562894](https://klipper.discourse.group/u/a0562894)\ **Post date:** [January 19, 2022, 10:19pm UTC](https://klipper.discourse.group/t/mcu-problem-printer-not-ready/1825/1 "2022-01-19T22:19:00Z")
Hello, I am trying to config Klipper on SKR 1.4 board. I went thru the config. Fluid is installed on my Raspeberry Pi. I compiled and flashed the firmware on my board. Yet it keeps showing “Printer is not ready” and “mcu ‘mcu’: Unable to connect”. When I check if the board is connected to the Pi with “ls /dev/serial/by-id/\*”, I get “serial: /dev/serial/by-id/usb-Klipper\_lpc1768\_05E0FF01809C48AF441F3A5DC62000F5-if00lpc” So I tried to input this in my printer.cfg but my klippy.log keeps showing the mcu being “serial = /dev/serial/by-id/usb-1a86\_USB\_Serial-if00-port0” When I tried to untick the USB during compilation of the firmware. I am not able to get anything in the serial request. When I input the serial that klippy.log gives me. nothing changes… Here is [klippy.log](https://klipper.discourse.group/uploads/short-url/lGZcHV8js6Ipb0ystBfGB0cTwZW.log) (225.9 KB) can someone guide me? Thank you Arthur ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [January 19, 2022, 10:25pm UTC](https://klipper.discourse.group/t/mcu-problem-printer-not-ready/1825/2 "2022-01-19T22:25:26Z")
It looks like you chose the wrong board type during `make menuconfig`. SKR 1.4 has a LPC1769 chip. ![grafik](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/02597a0221d5ebf20dd359e02ba06af73ee54f52.png) ---
**Author:** ![a0562894](https://avatars.discourse-cdn.com/v4/letter/a/b5a626/32.png) [@a0562894](https://klipper.discourse.group/u/a0562894)\ **Post date:** [January 20, 2022, 7:03am UTC](https://klipper.discourse.group/t/mcu-problem-printer-not-ready/1825/3 "2022-01-20T07:03:30Z")
thank you for the reply. Unfortunately, it is not the problem since my board is a non-turbo one. SKR 1.4 has a LPC1768 chip and the SKR 1.4 turbo has a LPC1769 chip. ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [January 20, 2022, 8:57am UTC](https://klipper.discourse.group/t/mcu-problem-printer-not-ready/1825/4 "2022-01-20T08:57:47Z")
Yes, sorry, of course you are right. > [@a0562894](#): > > When I check if the board is connected to the Pi with “ls /dev/serial/by-id/\*”, > I get “serial: /dev/serial/by-id/usb-Klipper\_lpc1768\_05E0FF01809C48AF441F3A5DC62000F5-if00lpc” This basically looks correct. Sometimes a board is not correctly flashed. Try repeating the flashing process. What strikes me a bit strange is -if00 **lpc** ending. Typically it looks like `/dev/serial/by-id/usb-Klipper_lpc1769_0C70001625813AAF86E06B5CC32000F5-if00` → just `if00` without the `lpc` ---
**Author:** ![a0562894](https://avatars.discourse-cdn.com/v4/letter/a/b5a626/32.png) [@a0562894](https://klipper.discourse.group/u/a0562894)\ **Post date:** [January 20, 2022, 5:36pm UTC](https://klipper.discourse.group/t/mcu-problem-printer-not-ready/1825/5 "2022-01-20T17:36:25Z")
Thank you! I double checked today the “ls /dev/serial/by-id/\*” and there was no lpc at the end. So I removed it from the printer.cfg and it stopped showing me the “printer is not ready” error. Thank you! ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [April 15, 2024, 12:00pm UTC](https://klipper.discourse.group/t/mcu-problem-printer-not-ready/1825/6 "2024-04-15T12:00:37Z")