Need Help! Spindle won't turn off

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Thread: Spindle won't turn off

  1. #1
    Member CarbonMan's Avatar
    Join Date
    Jul 2020

    Default Spindle won't turn off

    I have a YOOCNC pw2034 board. The spindle runs at full speed regardless of the speed control potentiometer or even the Spindle on/off switch. The board or the components don't have any obvious burn marks and the fuses are intact. I have disconnected both the on/off and the speed control and it still runs.

    I found the schematic from another discussion ( and I have attached it, but my electronics is really rusty.

    Any suggestions where to look? I appreciate any help.

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Spindle won't turn off

Spindle won't turn off

Spindle won't turn off