Sounds like you are refering to the encoder strip. It is a thin clear piece of plastic with little black lines all the way accross the length of it. The printer has a sensor on it that reads these lines so that the carriage assembly knows where it is inside the machine. It is usually spring loaded on one end of it. Both ends of the encoder strip have a notch on it. One side of the encoder strip hooks onto a fixed mount through one of the notches, the other side hooks onto a spring loaded mount. If it is all the way out the strip needs to be threaded back through the sensor on the back of the carriage assembly(the thing you install the ink cartridges into). Hope that helps a bit. It is a simple problem for a tech to fix but could be more difficult if you are trying to do this without removing any of the covers.
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