Filix,
That is for sure the old style power supply. The robot itself looks just like the two Dolphin diagnostics I had in rent house pools for about 8 years. I assume yours has a cloth bag???
It would be worth opening the power supply and checking for a fuse (I can't remember if there is one or not). The new style power supply will work just fine on your older robot.
The problem of course is you never know for sure if it is the power supply or the robot..
Do you know anyone in your area that has a Dolphin cleaner?? If so, you could borrow their power supply and see if the robot runs ok.
Thanks,
Jim R.