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The Obstruction Sensor detects any obstruction on the Print Table, such as wrinkles on the shirts, which can damage the print heads. On the left-hand side of the printer, there is an Obstruction Laser Diode, which generates the laser. On the right-hand side,there is the Obstruction Laser Sensor. WARNING: Although the laser used in the RICOH Ri 3000 and Ri 6000 printer is low power, exercise care so that laser does not shine directly into the eyes. The laser can cause injury. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.