# MCU 'mcu' shutdown: Missed scheduling of next digital out event

**URL:** <https://klipper.discourse.group/t/mcu-mcu-shutdown-missed-scheduling-of-next-digital-out-event/16352>\
**Category:** General Discussion\
**Created:** [May 8, 2024, 11:42pm UTC](https://klipper.discourse.group/t/mcu-mcu-shutdown-missed-scheduling-of-next-digital-out-event/16352 "2024-05-08T23:42:13Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![tasca](https://avatars.discourse-cdn.com/v4/letter/t/c67d28/32.png) [@tasca](https://klipper.discourse.group/u/tasca)\
**Post date:** [May 8, 2024, 11:42pm UTC](https://klipper.discourse.group/t/mcu-mcu-shutdown-missed-scheduling-of-next-digital-out-event/16352/1 "2024-05-08T23:42:13Z")

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### Basic Information:

Printer Model: upgraded 3D cloner  
 MCU / Printerboard: SKR 1.4  
 Host / SBC orange pi 3 LTS  
 klippy.log

_Fill out above information and_ **_in all cases attach your_ `klippy.log` _file_** (use zip to compress it, if too big). _Pasting your_ `printer.cfg` _is **not** needed_  
_ **Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there** _

### Describe your issue:

printer halts after random amount of time into a print with the following message:

MCU ‘mcu’ shutdown: Missed scheduling of next digital out event  
This is generally indicative of an intermittent  
communication failure between micro-controller and host

I have tried changing all the cables, using wifi and/or ethernet cable for the network, have fitted head sinks and fan to the SBC.

error occurs randomly  
[klippy.zip](https://klipper.discourse.group/uploads/short-url/kdt9rTL2fY4g23sVNa1Dlo6cfmd.zip) (964.4 KB)

…

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**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:** [May 9, 2024, 6:25am UTC](https://klipper.discourse.group/t/mcu-mcu-shutdown-missed-scheduling-of-next-digital-out-event/16352/2 "2024-05-09T06:25:09Z")

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Hello @tasca !

Would you mind to repeat the issue in the text?  
It’s for better style.

Thank you.

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\
**Post date:** [August 15, 2024, 11:25pm UTC](https://klipper.discourse.group/t/mcu-mcu-shutdown-missed-scheduling-of-next-digital-out-event/16352/4 "2024-08-15T23:25:53Z")

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Closed on August 15, 2024, 11:25pm UTC

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