When changing the print cartridge, the rubber band did not break

I do not know what you mean by clear tape or sponge strip but if by ridged you mean what i think then yeah we are pretty much taking about the rubber band that moves the carriage.

So it got off, huh... it normally happens when someone pulls way too hard the cartridges, anyways, if it got loosen from the right side you need to remove all covers and scanning unit.

to do this please remove the screws on the back side and then remove the black front covers, they are set by pressure on (and some plastic nails) so i recommend you to use a flat screw driver and gently pull. look up for little triangular marks or the plastic nails, any good pressure point. once those black covers are removed, unscrew the screws (i dont know if that's the proper expression sorry) you see and proceed to remove the plastic covers, they should come out easily. then you might not need to remove the scanning unit IF you actually can set the band on again. It goes around a little gear you can actually move towards your left to avoid stretching the band more than needed. good luck!!
if you nee dto remove the scnaning unit please unplug everything on the left side before. should be at least two flat cables and a few others.