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Fan schematic appears to be wrong #4

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your-friend-alice opened this issue Feb 28, 2023 · 0 comments
Open

Fan schematic appears to be wrong #4

your-friend-alice opened this issue Feb 28, 2023 · 0 comments

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@your-friend-alice
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your-friend-alice commented Feb 28, 2023 •
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The schematic shows that the fans are controlled by low-side switching (Pin 2 always connected to +5V, Pin 1 connected to GND through an N-channel MOSFET), but probing my board I can clearly tell that the fans are being high-side switched; pin 1 remains grounded continuously while pin 2 changes state based on M106 commands. What's up with this? Is there a newer unpublished revision of the Buddy board? This is a bit scary as I've been relying on these schematics for repairs and mods, and I'm just realizing I can't necessarily trust this schematic to accurately reflect the board.
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