You can find a service manual for guidance by searching. It's not very complicated. Unplug machine. Must remove front covers, the top cover, motherboard cover, tilt motherboard away from chassis. Remove several black keeper pins along top rail that hold cable in place. Tape the new cable to the motherboard end of cable and use the old cable to gently pull the new thru the machine, Make sure new cable is attached to the motherboard and carriage exactly as the old one. Taking pictures before removing cable from motherboard and carriage board helps to remember how to reattach. Also the black pins seem to get lost easily so be careful.