I just replaced my Rev F5 PrintrBoard after breaking the MicroUSB connector off of it (the second time I've done this -- what a terrible design choice!). I got PrintrBot's new Rev F6 PrintrBoard with USB-B connector. I've cut out the hole on the side of the chassis so the connector peeks through and hooked everything back up again. But I'm having trouble with the fan control.
The new board has two (2 pin) fan control connectors on the side (marked Fan 1 and Fan 2). The wiring diagrams on the PrintrBot site don't show these. I've tried plugging my fan cable into both of them and I'm not getting any control over the fan using M106/M107. While plugged into the Fan 1 pins, my fan turned on automatically when the hotend hit 50 degrees, but I couldn't manually turn it on or off (it turns back off when the hotend temperature drops below 50 again). This makes me think Fan 1 is intended as a hotend cooling fan (like for an E3Dv6 or similar). Fan 2 didn't seem to do anything.
Any thoughts on how to turn my print cooling fan on/off in the firmware on this controller board?