Frequently asked questions are about powering an APM2.5 or why the same does not work or why it has failed.
Here is a simplified schematic showing the major components of the 5V/Vcc circuit on the APM2.5
Target Audience: Readers who do not have Eagle or are confused about using it.
You Need: Basic electronic schematic reading ability
Note that I have separated the PWM Output section into the upper left corner with a heavy purple line that is bridged by the jumper JP1 on the APM2.5. This is to emphasize that diode D1 passes current through JP1 (and drops voltage). The remaining energy is then called 'Vcc'. Everything outside the purple corner is Vcc.
This is why the USB will power the APM2.5 when connected to a computer/USB hub. Note the fuse on the APM2.5 side of the USB connector AND another fuse on the output of D1. Another change from APM2.0 is the D4 6.0V Zener diode. If an over voltage is applied to the board, D4 will crowbar what it can to protect devices.
As with APM2.0, any 5V source connected to any of the indicated Vcc/5V points outside the purple corner (with GND of course) will power the APM2.5.
Also of note is the 'Mystery Port'. This port takes 5VDC before D1 and the fuse and is called 'JP_VCC'. Other clues to the mystery are the lines to 'ADC 12' and 'ADC 13'. A mystery indeed!
Any errors in this drawing from editing are mine.
I hope this can be used as reference for solving problems.
When I connect power to my APM2.5, the leds ABC do not light up at all. I can contact the board through USB however. The ESCs are also not seeing the output pins except for pin 1. This has just occurred all of a sudden after several flights of having the board powered through the output side, with JP1 jumper connected.
i dont know if im at the right place but i have a problem with my apm 2.5.2
after a calibration of my remote control nothing works.
when i plug the apm to usb the power up i see led red and blue flashing and after only red flashing
the tx and rx light always on, green led alive is on.
and nothing is detected in windows.
someone have an idea ?
This post is more for power connection issues but we do answer other questioins.
What is the application for your APM? Heli, Multirotor, Airplane, Rover?
How is the APM powered? If 2.5.2, are you using the 3DR Power Module?
yes i use the 3DR module and Multirotor.
With USB connected, will the APM respond to a CLI?
What radio TX/RX are you using?