Geeetech

I want to do auto bed leveling and need available pin for servo.
Board is Sanguinololu 1.3a with LCD 2004 connected.

Sorry, Sanguinololu has not this function.

Ok, I think I may use "beep" pin.

Another question.
I ordered GT2560 board. Could you send me a schematic diagram for this board?

It is a connection diagram.
I need a electric scheme to know which pins of the microcontroller can I use for my purposes.

Thanks!

For people who do not have the possibility to open Gerber files I have made a simple colored wiring schematic / diagram of the GT2560 board. Note: There are two different GT2560 boards out there: "Rev. A" and "unnamed".

Looks like the heatbed can be supplied independently by rail 1. Hotends, stepper drivers, fans and logic are supplied by rail 2.

In contrast to RAMPS the wiring of the GT2560 opens the option to literally cut the supply to the steppers: It would be possible to solder a step-down converter to the cut stepper supply to operate the steppers at 8.5V. It might be beneficial to optimize the motor voltage. Some people report that due to the blanking-time there is a current-overshoot which originates from a high supply voltage together with a low impedance motor. This results in skipped steps. See this good article here.

[Edit] I have successfully cut the +12V lane to the stepper drivers and used a DC boost converter to apply +24V to the TMC2100 stepper drivers. Works well so far. The cut is located next to the pin header for extruder #2.

Can someone tell me what transistor and Q4 is. Mine blee and according to my friends it shows A591. However I cannot find anything on this. This is a small 3 pin down by extruded 2's stepper driver by the 12v pins. It's right near the leg of the 12v reg.

I think I found what Q4 is. If someone can confirm it would be great. It looks like a A59T.. A59T 2.6A/30V SOT23 P-Channel MOSFET SMD transistor