Adjusts the power adapter with me?

For me a defective original power supply should be replaced, which had been canceled after just over 7 years with no apparent cause. (The connected scanner suddenly ceased to operate a. Confirms I suspect with a matching borrowed power supply.)
The output voltage (here 12V) must necessarily coincide with the data on the defective power supply. The output current (here 2A = 2000mA) must be approximately equal to the information on the defective power supply. Less output current than the defective power supply can cause problems. More output current is considerably less problematic. However, the polarity must be correct (here: positive inside, negative outside). More difficult to determine, but decisive, of course, the requirements of the so-operated device. Seeking after that on the nameplate or in the operator's manual of the device. The latter I find sometimes the Internet.
The voltage stability and the suppression of disorders are also important. All I can hope on the current state of technology.

Connectors:
EU plug for the socket (two round, partially insulated pins, plastic body with flat slanted sides)
12V connector:
outside-pole electrically minus, cylindrical metal casing with 5.5 mm diameter, about 9 mm long
indoor pole electrically Plus, hole for pin of 2.2 mm diameter (2.5 mm !! pins not fit in !!)

Housing:
The product photos do hardly conforms to the shape of the supplied equipment. The socket connector is transverse (not longitudinal, as shown) are arranged. This is handy for ordinary individual wall sockets (housing and cable hanging down), but impractical in many multiple sockets and power strips (housing and cable block adjacent slots).
Housing dimensions without cable and plug: approx 83 mm high, 44 mm wide and 31 mm deep (the plug disappears yes in the wall socket).
Cable length: about 130-140 cm

After regrouping the plug assignment of my power strip my scanner to the new power supply is functioning again.