If you can solder/desolder you can change it yourself at home by adding a resistor. Here are instructions from our user manual
The keyboard interface can be changed from PS/2 to USB and vice-versa. Converting the keyboard from USB to
PS/2 is not recommended unless you are competent at de-soldering electronic components. Please read all
instructions before beginning.
In either case, the keyboard must be disassembled by removing the screws from the bottom side of the enclosure
using the appropriate sized Phillips head screwdriver. After removing the screws, turn the keyboard upright and
carefully separate the top half from the bottom half. Note the routing of the data cord for strain relief purposes so that it can be routed the same way when the keyboard is reassembled. Also, note the location of the “W3” located on the printed circuit board above and between the “F4” and “F5” keys.
If converting from PS/2 to USB, unplug the USB end of the data cord from the Type A USB receptacle located at “J2” and plug the PS/2 end into the 6 pin mini-DIN female receptacle at “J1”’ which is located above and between the “F12” and “PrtSc” keys. Then clip-out and discard the 10K Ohm resistor at “W3”. Reverse the steps to reassemble the keyboard and follow the USB installation instructions.
If converting from USB to PS/2, unplug and remove the PS/2 end of the data cord from “J1” and plug the USB end of the data cord into the Type A receptacle which is located at “J2”. Use a soldering iron and solder removal tool to
remove the lead clippings from “W3”. Then solder a through-hole, 10K, 1/4W, 5% resistor at “W3”. Reverse the steps to reassemble the keyboard and follow the PS/2 installation instructions.
If you want us to switch it for you please email firstname.lastname@example.org
for more info.