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Dot Matrix printer not printing

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HAL 9000 Moderator

It's either a Micro Switch held in the No Paper Position which means the lever on it could be bent of jammed or it's an Optical Link where a label is stuck over the light or receiver and breaking the circuit.

Depending on the Make & Model of the unit you'll need to find it's Service Manual and work from there. As suggested above removing the Roller if it's an easy option is the way to proceed here but unfortunately with a lot of Modern Dot Matrix Printers doing this requires the complete dismantling of the unit. If that's the case in this instance replacing the Printer may be the cheaper option.