Bed Heater Hard on
-
Hi,
I have a problem with my printer bed heater starts heating as soon as i switch the printer on
i reloaded the saved working sketch (marlin-ramps 1-4) but no change
-
Bad MOSFET maybe? What kind of printer and what controller board does it have? Does it come on even if you don't have a PC plugged in?
-
It is a wilson TS
http://www.thingiverse.com/thing:255605
with ramps 1.4 marlin setup mega2560 keystudio board
http://www.ebay.com/itm/Keyestudio-3D-Printer-Kit-...
yes the bed starts heating as soon as its powered up, not connected to pc
-
thanks for the help
i replaced the mosfet with OTS 20 amp MOSFET and its working again
i think its a PNP i bought both npn and pnp then checked the negative on the heat sink with pos on right pin looking at the front
and got about 650 reading