E-9103 Means that there might be something jamming the cd-slot.
Something other than a CD might be inserted in the slot. Or something
inside the slot-in is broken en is jamming the mechanism.
You could also check you manual, somewhere in the back is an overview
of these codes :D
Also check this topic where I've mentioned all code that could be given by any ProDJ CDJ or CMX Cd player :
//www.djresource.eu/Forum/topic/632/CDJ-Error-Codes-Overview/