I just found out my Z5500 is broken, and also the reason why. It seems that a pin in the 15 pin (3x5) male stick is broken Now the question is, is it even possible to fix? I found a matching component, but I dont know if it is even possible to change, due to the way the whole piece is assembled in the first place.
Looks like a standard DB-15 PCB mounted male connector, 90 degree. Usually pretty easy to find a replacement, but looks like a bit of a bear to replace.
If your at all comfortable de-soldering connectors from a PCB, I'd go for it. Takes patience, though.