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Hello.
Really a 1K resistor, you only get 5mA ?
Whats the maximum current of this regulator ?

I don´t want to make this complete board, so can i add only this resistors into the 5V cables of the 3 endstops ?

Is there a way to protect the heating unit (Heating Lines)?
I know some people with an burned item, U13 named on the board.
The display shows an error
R EXTRUDER : NA

This could be the same problem: cable is broken, short circuit, burn !
Is there a way to protect this ?
Many thanks !

EDIT:
I see that this board is a little different. I wrote about an CTC printer with mightyboard.
On your pic the U13 is an TO-220 case, on the board i wrote about it is an DIL case ?
This have 8 pins