# MCU shutdown because Rescheduled Timer in the past

**URL:** <https://klipper.discourse.group/t/mcu-shutdown-because-rescheduled-timer-in-the-past/4632>\
**Category:** General Discussion\
**Created:** [October 25, 2022, 1:45pm UTC](https://klipper.discourse.group/t/mcu-shutdown-because-rescheduled-timer-in-the-past/4632 "2022-10-25T13:45:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![anurag30atulya](https://avatars.discourse-cdn.com/v4/letter/a/ecc23a/32.png) [@anurag30atulya](https://klipper.discourse.group/u/anurag30atulya)\
**Post date:** [October 25, 2022, 1:45pm UTC](https://klipper.discourse.group/t/mcu-shutdown-because-rescheduled-timer-in-the-past/4632/1 "2022-10-25T13:45:28Z")

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### Basic Information:

Printer Model: A1  
 MCU / Printerboard: Mks V1.4 with pi-Zero

 ![WhatsApp Image 2022-10-25 at 18.59.02](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/d/dc1a5b8a3df0045609495594a0392c6b809987c1.jpeg)

_Fill out above information and in all cases attach your_ `klippy.log` _file. Pasting your_ `printer.cfg` _is **not** needed_

### Describe your issue:

Tried printing it twice but print stops at same point with the error .  
 `klippy.log`  
[klippy.log](https://klipper.discourse.group/uploads/short-url/jP64i1WwkrxMD4Kjhy0SZy13tdq.log) (4.6 MB)

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**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:** [October 25, 2022, 3:41pm UTC](https://klipper.discourse.group/t/mcu-shutdown-because-rescheduled-timer-in-the-past/4632/2 "2022-10-25T15:41:22Z")

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It looks like your board cannot cope with the requested step rate. The MKS 1.4 is a pretty slow board and not able to generate too many steps at once.  
Try reducing `microsteps = 32` to 16. Maybe as a start only for the extruder and see if this already is sufficient.

This is the load graph of your board:

 ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/2/268ef0ff1a12e3472d3705c36b9b004b46e08fe6.png)

The spikes in the MCU load killed your printer and lead to the error message.

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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:** [November 1, 2024, 11:11am UTC](https://klipper.discourse.group/t/mcu-shutdown-because-rescheduled-timer-in-the-past/4632/3 "2024-11-01T11:11:36Z")

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