Interesting, what you say, Bartek.
But the problem still exists.
At the EU 07-503 activity no pantograph is in up position if you start. You can clearly see it, if you move to the back wall of the cabine (down arrow) and turn. If you try to rise it, it will fall back as described before. You can check, wether there is any power coming in by looking at the right voltige meter. It stands on zero volts.
If you don't try to rise the pantograph, just push "M", the blue light appears. Then if you push "X" the right swich of the first row on the table jumps over. Then if you push "C" nothing happens. No swich moves, no sound to be heard, the air pressure does not change.
However, if you push the "V" button, a sound of something appears, but nothing changes. The sound keeps on, even if you turn off the main circuit "m". After a wile, the sound stops similarly to a compressor stopping. No idea, what it could be.
But as I told, no sign of power on the engine, so the compressor does not start and no power to move.
Any idea?
Balage