# Transition to shutdown state: MCU 'mcu' shutdown: Timer too close

**URL:** <https://klipper.discourse.group/t/transition-to-shutdown-state-mcu-mcu-shutdown-timer-too-close/6231>\
**Category:** General Discussion\
**Created:** [January 27, 2023, 9:06am UTC](https://klipper.discourse.group/t/transition-to-shutdown-state-mcu-mcu-shutdown-timer-too-close/6231 "2023-01-27T09:06:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![wiphoenix](https://avatars.discourse-cdn.com/v4/letter/w/b5a626/32.png) [@wiphoenix](https://klipper.discourse.group/u/wiphoenix)\
**Post date:** [January 27, 2023, 9:06am UTC](https://klipper.discourse.group/t/transition-to-shutdown-state-mcu-mcu-shutdown-timer-too-close/6231/1 "2023-01-27T09:06:56Z")

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### Basic Information:

Printer Model: TronXY X5s  
 MCU / Printerboard: SKR 1.3  
 `klippy.log` [klippy (6).log](https://klipper.discourse.group/uploads/short-url/tJNnxeW0fGwzsWEqEXatrOH9lgc.log) (3.5 MB)

I’m using a RPi 3B+ with SKR 1.3 (connect via UART), then a BTT EBB42 v1.2 + BTT U2C v2.1  
RPi is powered via LM2596  
I modified klipper/klippy/mcu.py  
TRSYNC\_TIMEOUT = 0.05

I keep having “MCU ‘mcu’ shutdown: Timer too close” when printing a test cube.

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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:** [April 15, 2024, 11:57am UTC](https://klipper.discourse.group/t/transition-to-shutdown-state-mcu-mcu-shutdown-timer-too-close/6231/2 "2024-04-15T11:57:19Z")

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