Ramps 1.4 - no movement

Setup:
- Mega 2560 clone with Ramps 1.4 shield
- Repetier firmware
- Repetier-host
- steppers etc. from an ebay kit

Where I'm at:
After a couple tries with Marlin, I've gotten connection & communication by switching to the Repetier generated firmware. I get startup and can read the thermocouple in the extruder through Repetier-host. I believe this confirms the baud rate.

However! When attempting to manually control, I get no response - not from the motors, nor the extruder heater.

I'm not software- or electrically inclined, so I'm at a loss on what my next steps should be or how to even diagnose the problem. Can anyone help me, pretty please?

Check input volatge to the RAMPs from your power supply with multi-meter
Check stepper voltages with 12v off and usb power to the Arduino on, use 2v DC settings, voltage between ground and stepper pot should be .5v to .7v
Check endstop status with an M119 command, motors will usually only go one way if they don't know where the end-stop is

Steve

Edited 1 time(s). Last edit at 08/08/2016 05:23PM by SteveRoy.

First off, thank you Steve for the help.

Sorry for the late reply - pregnant wife & housework takes priority over tinkering!

The PS is supplying 12.46V to the RAMPS.

With 12V off, there is no V difference between any of the stepper pins (Checking only E0 and X for convenience)
With 12V recently plugged in, there is an initial ~.45V between E0 1B and 2B. This decays over ~10s to 0.

Does this indicate bad POLOLUs?

There is no mechanical response with m119.

The dialog response from m119: (multiple lines of the same response statement, e.g. "missing line detected", removed for expediency)

14:38:40.620 : Printer reset detected - initalizing
14:38:40.682 : start
14:38:40.836 : 000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.0000ok
14:38:40.836 : Warning: Missed line detected - correcting buffer usage.
14:38:40.867 : FIRMWARE_NAME:Repetierttps://github.com/repetier/Repetier-Firmware/ PROTOCOL_VERSION:1YPE:Mendel EXTRUDER_COUNT:1 REPEd filament:0.00m Printing time:0 days 0 hours 0 min
14:38:40.882 : X:0.00 Y:0.00 Z:0.00 E:0.00
14:38:49.950 : ait
14:38:51.035 : t
14:38:59.136 : 0
14:39:02.152 : Warning: Missed line detected - correcting buffer usage.
14:39:11.359 : 24
14:39:14.445 : /0 @:0
14:39:17.546 : Warning: Missed line detected - correcting buffer usage.
14:39:28.784 : t
14:39:29.800 : 0
14:39:32.819 : Warning: Seems like we missed a ok, got a wait - continue sending.
14:39:48.208 : Warning: Missed line detected - correcting buffer usage.
14:40:12.766 : 44
14:40:15.737 : Warning: Missed line detected - correcting buffer usage..
14:40:34.044 : Serial com errorystem.IO.Ports.SerialErrorReceivedEventArgs
14:40:58.043 : No start signal detected - forcing start
14:41:11.066 : Serial com errorystem.IO.Ports.SerialErrorReceivedEventArgs
14:41:13.514 : No start signal detected - forcing start
14:41:34.269 : it
14:41:35.338 : :0
14:41:51.040 : Serial com errorystem.IO.Ports.SerialErrorReceivedEventArgs

Thanks again,
Another Steve