"Autotune works in altitude hold and you must have the throttle in center position and sticks too..
Control your radio calibration."

"Strange thing as if I remember well if you put a ubec on output it will power the board...
Be aware that its power module output only 5v not 5.2 and sometime I had power warnings in my dataflash logs...
Too low power vcc it could brown out"

"http://copter.ardupilot.com/wiki/flying-arducopter/prearm_safety_ch..."

"Are you sure you disabled prearming checks in mission planner?"

"I think it's useless..
Usually GPS modules have their own leds and if you set prearming check your apm won't arm if it is not in 3d fix below 3m hdop
When it arms motor start to spin slowly, so..."

"I don't look at them :-)
Just power, connect mission planner or 3DR tower on my smartphone to control everithing is ok and then go fly!
I use them just to control some things like the "autotrim" mode enabling.
If you pull the yaw right and throttle…"

"Ok and to see if the mag is working just use a magnet and move it around the GPS. Look at the HUD in Mission Planner to see if your heading changes"

"If I remember well they go near the GPS, i2c slot. Try the 2 different combinations (like tx/rx and rx/tx)"

"With 5v power I went flying for 10 minutes, but it's a risk.."

"Hello
It's not broken..
Simply it doesn't give enough power.. I have another one and asap I'll try with that
Otherwise a bec with attopilot to measure V and A"

"Update
Installed on my diy tricopter it flies really nice!!
All works fine, every calibration and setup was easy as pie.
Just one problem..
The power module, take care of it!
It produces 5,0V on the output VCC (usually it shold be 5,3V) and so apm…"

"Hello Brian
today I made another test that is the JP1 presence/absence.
I think it is present on the board because I connected a UBEC to one of the OUT channel without Power module connected and the board started also with RX powered trough…"

"ok right now everything works
I installed a Crius ublox neo 7M with mag onboard, All Ok
3Dr radio clone ok
Power module OK
Frsky D4R-II in cppm mode (signal 3 and 4 with jumper). Just connect channel one to Input one on APM and bridge in2 and in3…"

"Ok
board arrived
Nice little piece of technic
Opened up it has the foam cover for the baro inside, separated from status led by some plastic protrusion from the upper cover.
I connected it to my laptop and uploaded the Arducopter Tri 3.2.1 without…"

"Hi
look at this thread
http://www.rcgroups.com/forums/showthread.php?t=2125461
post #8

This is the picture with mentioned pads
http://static.rcgroups.net/forums/attachments/2/7/7/5/8/0/a6678624-..."

"I read a topic on apm mini that said to cut a trace between 2 ppm pads ND solder one ppm pad to ch5 pad on the board circuit to enable ppm on ch5.
If you take a look at this photo
http://www.thanksbuyer.com/image/cache/data/sku-38151-5-600x600.jpg…"